[libsigrok.git] / src / hardware / saleae-logic16 / api.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013 Marcus Comstedt <marcus@mc.pp.se>
 * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
 *
 * 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 <config.h>
#include <glib.h>
#include <libusb.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <libsigrok/libsigrok.h>
#include "libsigrok-internal.h"
#include "protocol.h"

#define LOGIC16_VID		0x21a9
#define LOGIC16_PID		0x1001

#define USB_INTERFACE		0
#define USB_CONFIGURATION	1
#define FX2_FIRMWARE		"saleae-logic16-fx2.fw"

#define MAX_RENUM_DELAY_MS	3000
#define NUM_SIMUL_TRANSFERS	32

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

static const uint32_t drvopts[] = {
	SR_CONF_LOGIC_ANALYZER,
};

static const uint32_t devopts[] = {
	SR_CONF_CONTINUOUS,
	SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
	SR_CONF_CONN | SR_CONF_GET,
	SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
	SR_CONF_VOLTAGE_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
	SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
	SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
};

static const int32_t trigger_matches[] = {
	SR_TRIGGER_ZERO,
	SR_TRIGGER_ONE,
	SR_TRIGGER_RISING,
	SR_TRIGGER_FALLING,
	SR_TRIGGER_EDGE,
};

static const char *channel_names[] = {
	"0", "1", "2", "3", "4", "5", "6", "7", "8",
	"9", "10", "11", "12", "13", "14", "15",
};

static const struct {
	enum voltage_range range;
} thresholds_ranges[] = {
	{ VOLTAGE_RANGE_18_33_V, },
	{ VOLTAGE_RANGE_5_V, },
};

static const double thresholds[][2] = {
	{ 0.7, 1.4 },
	{ 1.4, 3.6 },
};

static const uint64_t samplerates[] = {
	SR_KHZ(500),
	SR_MHZ(1),
	SR_MHZ(2),
	SR_MHZ(4),
	SR_MHZ(5),
	SR_MHZ(8),
	SR_MHZ(10),
	SR_KHZ(12500),
	SR_MHZ(16),
	SR_MHZ(20),
	SR_MHZ(25),
	SR_MHZ(32),
	SR_MHZ(40),
	SR_MHZ(50),
	SR_MHZ(80),
	SR_MHZ(100),
};

static gboolean check_conf_profile(libusb_device *dev)
{
	struct libusb_device_descriptor des;
	struct libusb_device_handle *hdl;
	gboolean ret;
	unsigned char strdesc[64];

	hdl = NULL;
	ret = FALSE;
	while (!ret) {
		/* Assume the FW has not been loaded, unless proven wrong. */
		libusb_get_device_descriptor(dev, &des);

		if (libusb_open(dev, &hdl) != 0)
			break;

		if (libusb_get_string_descriptor_ascii(hdl,
		    des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
			break;
		if (strcmp((const char *)strdesc, "Saleae LLC"))
			break;

		if (libusb_get_string_descriptor_ascii(hdl,
		    des.iProduct, strdesc, sizeof(strdesc)) < 0)
			break;
		if (strcmp((const char *)strdesc, "Logic S/16"))
			break;

		/* If we made it here, it must be a configured Logic16. */
		ret = TRUE;
	}
	if (hdl)
		libusb_close(hdl);

	return ret;
}

static GSList *scan(struct sr_dev_driver *di, GSList *options)
{
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	struct sr_usb_dev_inst *usb;
	struct sr_config *src;
	GSList *l, *devices, *conn_devices;
	struct libusb_device_descriptor des;
	libusb_device **devlist;
	unsigned int i, j;
	const char *conn;
	char connection_id[64];

	drvc = di->context;

	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)
		conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
	else
		conn_devices = NULL;

	/* Find all Logic16 devices and upload firmware to them. */
	devices = NULL;
	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	for (i = 0; devlist[i]; i++) {
		if (conn) {
			usb = NULL;
			for (l = conn_devices; l; l = l->next) {
				usb = l->data;
				if (usb->bus == libusb_get_bus_number(devlist[i])
				    && usb->address == libusb_get_device_address(devlist[i]))
					break;
			}
			if (!l)
				/* This device matched none of the ones that
				 * matched the conn specification. */
				continue;
		}

		libusb_get_device_descriptor(devlist[i], &des);

		usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));

		if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
			continue;

		sdi = g_malloc0(sizeof(struct sr_dev_inst));
		sdi->status = SR_ST_INITIALIZING;
		sdi->vendor = g_strdup("Saleae");
		sdi->model = g_strdup("Logic16");
		sdi->connection_id = g_strdup(connection_id);

		for (j = 0; j < ARRAY_SIZE(channel_names); j++)
			sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
					channel_names[j]);

		devc = g_malloc0(sizeof(struct dev_context));
		devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
		sdi->priv = devc;
		devices = g_slist_append(devices, sdi);

		if (check_conf_profile(devlist[i])) {
			/* Already has the firmware, so fix the new address. */
			sr_dbg("Found a Logic16 device.");
			sdi->status = SR_ST_INACTIVE;
			sdi->inst_type = SR_INST_USB;
			sdi->conn = sr_usb_dev_inst_new(
				libusb_get_bus_number(devlist[i]),
				libusb_get_device_address(devlist[i]), NULL);
		} else {
			if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
					USB_CONFIGURATION, FX2_FIRMWARE) == SR_OK)
				/* Store when this device's FW was updated. */
				devc->fw_updated = g_get_monotonic_time();
			else
				sr_err("Firmware upload failed.");
			sdi->inst_type = SR_INST_USB;
			sdi->conn = sr_usb_dev_inst_new(
				libusb_get_bus_number(devlist[i]), 0xff, NULL);
		}
	}
	libusb_free_device_list(devlist, 1);
	g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);

	return std_scan_complete(di, devices);
}

static int logic16_dev_open(struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di;
	libusb_device **devlist;
	struct sr_usb_dev_inst *usb;
	struct libusb_device_descriptor des;
	struct drv_context *drvc;
	int ret = SR_ERR, i, device_count;
	char connection_id[64];

	di = sdi->driver;
	drvc = di->context;
	usb = sdi->conn;

	device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	if (device_count < 0) {
		sr_err("Failed to get device list: %s.",
		       libusb_error_name(device_count));
		return SR_ERR;
	}

	for (i = 0; i < device_count; i++) {
		libusb_get_device_descriptor(devlist[i], &des);

		if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
			continue;

		if ((sdi->status == SR_ST_INITIALIZING) ||
				(sdi->status == SR_ST_INACTIVE)) {
			/*
			 * Check device by its physical USB bus/port address.
			 */
			usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
			if (strcmp(sdi->connection_id, connection_id))
				/* This is not the one. */
				continue;
		}

		if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
			if (usb->address == 0xff)
				/*
				 * First time we touch this device after FW
				 * upload, so we don't know the address yet.
				 */
				usb->address = libusb_get_device_address(devlist[i]);
		} else {
			sr_err("Failed to open device: %s.",
			       libusb_error_name(ret));
			ret = SR_ERR;
			break;
		}

		ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
		if (ret == LIBUSB_ERROR_BUSY) {
			sr_err("Unable to claim USB interface. Another "
			       "program or driver has already claimed it.");
			ret = SR_ERR;
			break;
		} else if (ret == LIBUSB_ERROR_NO_DEVICE) {
			sr_err("Device has been disconnected.");
			ret = SR_ERR;
			break;
		} else if (ret != 0) {
			sr_err("Unable to claim interface: %s.",
			       libusb_error_name(ret));
			ret = SR_ERR;
			break;
		}

		if ((ret = logic16_init_device(sdi)) != SR_OK) {
			sr_err("Failed to init device.");
			break;
		}

		sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
			usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);

		ret = SR_OK;

		break;
	}

	libusb_free_device_list(devlist, 1);

	if (ret != SR_OK) {
		if (usb->devhdl) {
			libusb_release_interface(usb->devhdl, USB_INTERFACE);
			libusb_close(usb->devhdl);
			usb->devhdl = NULL;
		}
		return SR_ERR;
	}

	return SR_OK;
}

static int dev_open(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int ret;
	int64_t timediff_us, timediff_ms;

	devc = sdi->priv;

	/*
	 * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
	 * milliseconds for the FX2 to renumerate.
	 */
	ret = SR_ERR;
	if (devc->fw_updated > 0) {
		sr_info("Waiting for device to reset.");
		/* Takes >= 300ms for the FX2 to be gone from the USB bus. */
		g_usleep(300 * 1000);
		timediff_ms = 0;
		while (timediff_ms < MAX_RENUM_DELAY_MS) {
			if ((ret = logic16_dev_open(sdi)) == SR_OK)
				break;
			g_usleep(100 * 1000);

			timediff_us = g_get_monotonic_time() - devc->fw_updated;
			timediff_ms = timediff_us / 1000;
			sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
		}
		if (ret != SR_OK) {
			sr_err("Device failed to renumerate.");
			return SR_ERR;
		}
		sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
	} else {
		sr_info("Firmware upload was not needed.");
		ret = logic16_dev_open(sdi);
	}

	if (ret != SR_OK) {
		sr_err("Unable to open device.");
		return SR_ERR;
	}

	if (devc->cur_samplerate == 0) {
		/* Samplerate hasn't been set; default to the slowest one. */
		devc->cur_samplerate = samplerates[0];
	}

	return SR_OK;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	struct sr_usb_dev_inst *usb;

	usb = sdi->conn;

	if (!usb->devhdl)
		return SR_ERR_BUG;

	sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
		usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	libusb_close(usb->devhdl);
	usb->devhdl = NULL;

	return SR_OK;
}

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;
	unsigned int i;

	(void)cg;

	switch (key) {
	case SR_CONF_CONN:
		if (!sdi || !sdi->conn)
			return SR_ERR_ARG;
		usb = sdi->conn;
		if (usb->address == 255)
			/* Device still needs to re-enumerate after firmware
			 * upload, so we don't know its (future) address. */
			return SR_ERR;
		*data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
		break;
	case SR_CONF_SAMPLERATE:
		if (!sdi)
			return SR_ERR;
		devc = sdi->priv;
		*data = g_variant_new_uint64(devc->cur_samplerate);
		break;
	case SR_CONF_CAPTURE_RATIO:
		if (!sdi)
			return SR_ERR;
		devc = sdi->priv;
		*data = g_variant_new_uint64(devc->capture_ratio);
		break;
	case SR_CONF_VOLTAGE_THRESHOLD:
		if (!sdi)
			return SR_ERR;
		devc = sdi->priv;
		for (i = 0; i < ARRAY_SIZE(thresholds); i++) {
			if (devc->selected_voltage_range != thresholds_ranges[i].range)
				continue;
			*data = std_gvar_tuple_double(thresholds[i][0], thresholds[i][1]);
			return SR_OK;
		}
		return SR_ERR;
	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 dev_context *devc;
	int idx;

	(void)cg;

	devc = sdi->priv;

	switch (key) {
	case SR_CONF_SAMPLERATE:
		devc->cur_samplerate = g_variant_get_uint64(data);
		break;
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		break;
	case SR_CONF_CAPTURE_RATIO:
		devc->capture_ratio = g_variant_get_uint64(data);
		break;
	case SR_CONF_VOLTAGE_THRESHOLD:
		if ((idx = std_double_tuple_idx(data, ARRAY_AND_SIZE(thresholds))) < 0)
			return SR_ERR_ARG;
		devc->selected_voltage_range = thresholds_ranges[idx].range;
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_list(uint32_t key, GVariant **data,
	const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
{
	switch (key) {
	case SR_CONF_SCAN_OPTIONS:
	case SR_CONF_DEVICE_OPTIONS:
		return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
	case SR_CONF_SAMPLERATE:
		*data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
		break;
	case SR_CONF_VOLTAGE_THRESHOLD:
		*data = std_gvar_thresholds(ARRAY_AND_SIZE(thresholds));
		break;
	case SR_CONF_TRIGGER_MATCH:
		*data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static void abort_acquisition(struct dev_context *devc)
{
	int i;

	devc->sent_samples = -1;

	for (i = devc->num_transfers - 1; i >= 0; i--) {
		if (devc->transfers[i])
			libusb_cancel_transfer(devc->transfers[i]);
	}
}

static unsigned int bytes_per_ms(struct dev_context *devc)
{
	return devc->cur_samplerate * devc->num_channels / 8000;
}

static size_t get_buffer_size(struct dev_context *devc)
{
	size_t s;

	/*
	 * The buffer should be large enough to hold 10ms of data and
	 * a multiple of 512.
	 */
	s = 10 * bytes_per_ms(devc);
	return (s + 511) & ~511;
}

static unsigned int get_number_of_transfers(struct dev_context *devc)
{
	unsigned int n;

	/* Total buffer size should be able to hold about 500ms of data. */
	n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);

	if (n > NUM_SIMUL_TRANSFERS)
		return NUM_SIMUL_TRANSFERS;

	return n;
}

static unsigned int get_timeout(struct dev_context *devc)
{
	size_t total_size;
	unsigned int timeout;

	total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
	timeout = total_size / bytes_per_ms(devc);
	return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
}

static int configure_channels(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct sr_channel *ch;
	GSList *l;
	uint16_t channel_bit;

	devc = sdi->priv;

	devc->cur_channels = 0;
	devc->num_channels = 0;
	for (l = sdi->channels; l; l = l->next) {
		ch = (struct sr_channel *)l->data;
		if (ch->enabled == FALSE)
			continue;

		channel_bit = 1 << (ch->index);

		devc->cur_channels |= channel_bit;

#ifdef WORDS_BIGENDIAN
		/*
		 * Output logic data should be stored in little endian format.
		 * To speed things up during conversion, do the switcharoo
		 * here instead.
		 */
		channel_bit = 1 << (ch->index ^ 8);
#endif

		devc->channel_masks[devc->num_channels++] = channel_bit;
	}

	return SR_OK;
}

static int receive_data(int fd, int revents, void *cb_data)
{
	struct timeval tv;
	struct dev_context *devc;
	struct drv_context *drvc;
	const struct sr_dev_inst *sdi;
	struct sr_dev_driver *di;

	(void)fd;
	(void)revents;

	sdi = cb_data;
	di = sdi->driver;
	drvc = di->context;
	devc = sdi->priv;

	tv.tv_sec = tv.tv_usec = 0;
	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);

	if (devc->sent_samples == -2) {
		logic16_abort_acquisition(sdi);
		abort_acquisition(devc);
	}

	return TRUE;
}

static int dev_acquisition_start(const struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di = sdi->driver;
	struct dev_context *devc;
	struct drv_context *drvc;
	struct sr_usb_dev_inst *usb;
	struct sr_trigger *trigger;
	struct libusb_transfer *transfer;
	unsigned int i, timeout, num_transfers;
	int ret;
	unsigned char *buf;
	size_t size, convsize;

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

	/* Configures devc->cur_channels. */
	if (configure_channels(sdi) != SR_OK) {
		sr_err("Failed to configure channels.");
		return SR_ERR;
	}

	devc->sent_samples = 0;
	devc->empty_transfer_count = 0;
	devc->cur_channel = 0;
	memset(devc->channel_data, 0, sizeof(devc->channel_data));

	if ((trigger = sr_session_trigger_get(sdi->session))) {
		int pre_trigger_samples = 0;
		if (devc->limit_samples > 0)
			pre_trigger_samples = (devc->capture_ratio * devc->limit_samples) / 100;
		devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
		if (!devc->stl)
			return SR_ERR_MALLOC;
		devc->trigger_fired = FALSE;
	} else
		devc->trigger_fired = TRUE;

	timeout = get_timeout(devc);
	num_transfers = get_number_of_transfers(devc);
	size = get_buffer_size(devc);
	convsize = (size / devc->num_channels + 2) * 16;
	devc->submitted_transfers = 0;

	devc->convbuffer_size = convsize;
	if (!(devc->convbuffer = g_try_malloc(convsize))) {
		sr_err("Conversion buffer malloc failed.");
		return SR_ERR_MALLOC;
	}

	devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
	if (!devc->transfers) {
		sr_err("USB transfers malloc failed.");
		g_free(devc->convbuffer);
		return SR_ERR_MALLOC;
	}

	if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
					     devc->cur_channels)) != SR_OK) {
		g_free(devc->transfers);
		g_free(devc->convbuffer);
		return ret;
	}

	devc->num_transfers = num_transfers;
	for (i = 0; i < num_transfers; i++) {
		if (!(buf = g_try_malloc(size))) {
			sr_err("USB transfer buffer malloc failed.");
			if (devc->submitted_transfers)
				abort_acquisition(devc);
			else {
				g_free(devc->transfers);
				g_free(devc->convbuffer);
			}
			return SR_ERR_MALLOC;
		}
		transfer = libusb_alloc_transfer(0);
		libusb_fill_bulk_transfer(transfer, usb->devhdl,
				2 | LIBUSB_ENDPOINT_IN, buf, size,
				logic16_receive_transfer, (void *)sdi, timeout);
		if ((ret = libusb_submit_transfer(transfer)) != 0) {
			sr_err("Failed to submit transfer: %s.",
			       libusb_error_name(ret));
			libusb_free_transfer(transfer);
			g_free(buf);
			abort_acquisition(devc);
			return SR_ERR;
		}
		devc->transfers[i] = transfer;
		devc->submitted_transfers++;
	}

	devc->ctx = drvc->sr_ctx;

	usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);

	std_session_send_df_header(sdi);

	if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
		abort_acquisition(devc);
		return ret;
	}

	return SR_OK;
}

static int dev_acquisition_stop(struct sr_dev_inst *sdi)
{
	int ret;

	ret = logic16_abort_acquisition(sdi);

	abort_acquisition(sdi->priv);

	return ret;
}

static struct sr_dev_driver saleae_logic16_driver_info = {
	.name = "saleae-logic16",
	.longname = "Saleae Logic16",
	.api_version = 1,
	.init = std_init,
	.cleanup = std_cleanup,
	.scan = scan,
	.dev_list = std_dev_list,
	.dev_clear = std_dev_clear,
	.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,
	.context = NULL,
};
SR_REGISTER_DEV_DRIVER(saleae_logic16_driver_info);
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2013 Marcus Comstedt <marcus@mc.pp.se>
	5	* Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
	6	* Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
	7	*
	8	* This program is free software: you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation, either version 3 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	20	*/
	21
	22	#include <config.h>
	23	#include <glib.h>
	24	#include <libusb.h>
	25	#include <stdlib.h>
	26	#include <string.h>
	27	#include <math.h>
	28	#include <libsigrok/libsigrok.h>
	29	#include "libsigrok-internal.h"
	30	#include "protocol.h"
	31
	32	#define LOGIC16_VID 0x21a9
	33	#define LOGIC16_PID 0x1001
	34
	35	#define USB_INTERFACE 0
	36	#define USB_CONFIGURATION 1
	37	#define FX2_FIRMWARE "saleae-logic16-fx2.fw"
	38
	39	#define MAX_RENUM_DELAY_MS 3000
	40	#define NUM_SIMUL_TRANSFERS 32
	41
	42	static const uint32_t scanopts[] = {
	43	SR_CONF_CONN,
	44	};
	45
	46	static const uint32_t drvopts[] = {
	47	SR_CONF_LOGIC_ANALYZER,
	48	};
	49
	50	static const uint32_t devopts[] = {
	51	SR_CONF_CONTINUOUS,
	52	SR_CONF_LIMIT_SAMPLES \| SR_CONF_SET,
	53	SR_CONF_CONN \| SR_CONF_GET,
	54	SR_CONF_SAMPLERATE \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
	55	SR_CONF_VOLTAGE_THRESHOLD \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
	56	SR_CONF_TRIGGER_MATCH \| SR_CONF_LIST,
	57	SR_CONF_CAPTURE_RATIO \| SR_CONF_GET \| SR_CONF_SET,
	58	};
	59
	60	static const int32_t trigger_matches[] = {
	61	SR_TRIGGER_ZERO,
	62	SR_TRIGGER_ONE,
	63	SR_TRIGGER_RISING,
	64	SR_TRIGGER_FALLING,
	65	SR_TRIGGER_EDGE,
	66	};
	67
	68	static const char *channel_names[] = {
	69	"0", "1", "2", "3", "4", "5", "6", "7", "8",
	70	"9", "10", "11", "12", "13", "14", "15",
	71	};
	72
	73	static const struct {
	74	enum voltage_range range;
	75	} thresholds_ranges[] = {
	76	{ VOLTAGE_RANGE_18_33_V, },
	77	{ VOLTAGE_RANGE_5_V, },
	78	};
	79
	80	static const double thresholds[][2] = {
	81	{ 0.7, 1.4 },
	82	{ 1.4, 3.6 },
	83	};
	84
	85	static const uint64_t samplerates[] = {
	86	SR_KHZ(500),
	87	SR_MHZ(1),
	88	SR_MHZ(2),
	89	SR_MHZ(4),
	90	SR_MHZ(5),
	91	SR_MHZ(8),
	92	SR_MHZ(10),
	93	SR_KHZ(12500),
	94	SR_MHZ(16),
	95	SR_MHZ(20),
	96	SR_MHZ(25),
	97	SR_MHZ(32),
	98	SR_MHZ(40),
	99	SR_MHZ(50),
	100	SR_MHZ(80),
	101	SR_MHZ(100),
	102	};
	103
	104	static gboolean check_conf_profile(libusb_device *dev)
	105	{
	106	struct libusb_device_descriptor des;
	107	struct libusb_device_handle *hdl;
	108	gboolean ret;
	109	unsigned char strdesc[64];
	110
	111	hdl = NULL;
	112	ret = FALSE;
	113	while (!ret) {
	114	/* Assume the FW has not been loaded, unless proven wrong. */
	115	libusb_get_device_descriptor(dev, &des);
	116
	117	if (libusb_open(dev, &hdl) != 0)
	118	break;
	119
	120	if (libusb_get_string_descriptor_ascii(hdl,
	121	des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
	122	break;
	123	if (strcmp((const char *)strdesc, "Saleae LLC"))
	124	break;
	125
	126	if (libusb_get_string_descriptor_ascii(hdl,
	127	des.iProduct, strdesc, sizeof(strdesc)) < 0)
	128	break;
	129	if (strcmp((const char *)strdesc, "Logic S/16"))
	130	break;
	131
	132	/* If we made it here, it must be a configured Logic16. */
	133	ret = TRUE;
	134	}
	135	if (hdl)
	136	libusb_close(hdl);
	137
	138	return ret;
	139	}
	140
	141	static GSList scan(struct sr_dev_driver di, GSList *options)
	142	{
	143	struct drv_context *drvc;
	144	struct dev_context *devc;
	145	struct sr_dev_inst *sdi;
	146	struct sr_usb_dev_inst *usb;
	147	struct sr_config *src;
	148	GSList l, devices, *conn_devices;
	149	struct libusb_device_descriptor des;
	150	libusb_device **devlist;
	151	unsigned int i, j;
	152	const char *conn;
	153	char connection_id[64];
	154
	155	drvc = di->context;
	156
	157	conn = NULL;
	158	for (l = options; l; l = l->next) {
	159	src = l->data;
	160	switch (src->key) {
	161	case SR_CONF_CONN:
	162	conn = g_variant_get_string(src->data, NULL);
	163	break;
	164	}
	165	}
	166	if (conn)
	167	conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
	168	else
	169	conn_devices = NULL;
	170
	171	/* Find all Logic16 devices and upload firmware to them. */
	172	devices = NULL;
	173	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	174	for (i = 0; devlist[i]; i++) {
	175	if (conn) {
	176	usb = NULL;
	177	for (l = conn_devices; l; l = l->next) {
	178	usb = l->data;
	179	if (usb->bus == libusb_get_bus_number(devlist[i])
	180	&& usb->address == libusb_get_device_address(devlist[i]))
	181	break;
	182	}
	183	if (!l)
	184	/* This device matched none of the ones that
	185	* matched the conn specification. */
	186	continue;
	187	}
	188
	189	libusb_get_device_descriptor(devlist[i], &des);
	190
	191	usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
	192
	193	if (des.idVendor != LOGIC16_VID \|\| des.idProduct != LOGIC16_PID)
	194	continue;
	195
	196	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	197	sdi->status = SR_ST_INITIALIZING;
	198	sdi->vendor = g_strdup("Saleae");
	199	sdi->model = g_strdup("Logic16");
	200	sdi->connection_id = g_strdup(connection_id);
	201
	202	for (j = 0; j < ARRAY_SIZE(channel_names); j++)
	203	sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
	204	channel_names[j]);
	205
	206	devc = g_malloc0(sizeof(struct dev_context));
	207	devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
	208	sdi->priv = devc;
	209	devices = g_slist_append(devices, sdi);
	210
	211	if (check_conf_profile(devlist[i])) {
	212	/* Already has the firmware, so fix the new address. */
	213	sr_dbg("Found a Logic16 device.");
	214	sdi->status = SR_ST_INACTIVE;
	215	sdi->inst_type = SR_INST_USB;
	216	sdi->conn = sr_usb_dev_inst_new(
	217	libusb_get_bus_number(devlist[i]),
	218	libusb_get_device_address(devlist[i]), NULL);
	219	} else {
	220	if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
	221	USB_CONFIGURATION, FX2_FIRMWARE) == SR_OK)
	222	/* Store when this device's FW was updated. */
	223	devc->fw_updated = g_get_monotonic_time();
	224	else
	225	sr_err("Firmware upload failed.");
	226	sdi->inst_type = SR_INST_USB;
	227	sdi->conn = sr_usb_dev_inst_new(
	228	libusb_get_bus_number(devlist[i]), 0xff, NULL);
	229	}
	230	}
	231	libusb_free_device_list(devlist, 1);
	232	g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
	233
	234	return std_scan_complete(di, devices);
	235	}
	236
	237	static int logic16_dev_open(struct sr_dev_inst *sdi)
	238	{
	239	struct sr_dev_driver *di;
	240	libusb_device **devlist;
	241	struct sr_usb_dev_inst *usb;
	242	struct libusb_device_descriptor des;
	243	struct drv_context *drvc;
	244	int ret = SR_ERR, i, device_count;
	245	char connection_id[64];
	246
	247	di = sdi->driver;
	248	drvc = di->context;
	249	usb = sdi->conn;
	250
	251	device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	252	if (device_count < 0) {
	253	sr_err("Failed to get device list: %s.",
	254	libusb_error_name(device_count));
	255	return SR_ERR;
	256	}
	257
	258	for (i = 0; i < device_count; i++) {
	259	libusb_get_device_descriptor(devlist[i], &des);
	260
	261	if (des.idVendor != LOGIC16_VID \|\| des.idProduct != LOGIC16_PID)
	262	continue;
	263
	264	if ((sdi->status == SR_ST_INITIALIZING) \|\|
	265	(sdi->status == SR_ST_INACTIVE)) {
	266	/*
	267	* Check device by its physical USB bus/port address.
	268	*/
	269	usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
	270	if (strcmp(sdi->connection_id, connection_id))
	271	/* This is not the one. */
	272	continue;
	273	}
	274
	275	if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
	276	if (usb->address == 0xff)
	277	/*
	278	* First time we touch this device after FW
	279	* upload, so we don't know the address yet.
	280	*/
	281	usb->address = libusb_get_device_address(devlist[i]);
	282	} else {
	283	sr_err("Failed to open device: %s.",
	284	libusb_error_name(ret));
	285	ret = SR_ERR;
	286	break;
	287	}
	288
	289	ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
	290	if (ret == LIBUSB_ERROR_BUSY) {
	291	sr_err("Unable to claim USB interface. Another "
	292	"program or driver has already claimed it.");
	293	ret = SR_ERR;
	294	break;
	295	} else if (ret == LIBUSB_ERROR_NO_DEVICE) {
	296	sr_err("Device has been disconnected.");
	297	ret = SR_ERR;
	298	break;
	299	} else if (ret != 0) {
	300	sr_err("Unable to claim interface: %s.",
	301	libusb_error_name(ret));
	302	ret = SR_ERR;
	303	break;
	304	}
	305
	306	if ((ret = logic16_init_device(sdi)) != SR_OK) {
	307	sr_err("Failed to init device.");
	308	break;
	309	}
	310
	311	sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
	312	usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
	313
	314	ret = SR_OK;
	315
	316	break;
	317	}
	318
	319	libusb_free_device_list(devlist, 1);
	320
	321	if (ret != SR_OK) {
	322	if (usb->devhdl) {
	323	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	324	libusb_close(usb->devhdl);
	325	usb->devhdl = NULL;
	326	}
	327	return SR_ERR;
	328	}
	329
	330	return SR_OK;
	331	}
	332
	333	static int dev_open(struct sr_dev_inst *sdi)
	334	{
	335	struct dev_context *devc;
	336	int ret;
	337	int64_t timediff_us, timediff_ms;
	338
	339	devc = sdi->priv;
	340
	341	/*
	342	* If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
	343	* milliseconds for the FX2 to renumerate.
	344	*/
	345	ret = SR_ERR;
	346	if (devc->fw_updated > 0) {
	347	sr_info("Waiting for device to reset.");
	348	/* Takes >= 300ms for the FX2 to be gone from the USB bus. */
	349	g_usleep(300 * 1000);
	350	timediff_ms = 0;
	351	while (timediff_ms < MAX_RENUM_DELAY_MS) {
	352	if ((ret = logic16_dev_open(sdi)) == SR_OK)
	353	break;
	354	g_usleep(100 * 1000);
	355
	356	timediff_us = g_get_monotonic_time() - devc->fw_updated;
	357	timediff_ms = timediff_us / 1000;
	358	sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
	359	}
	360	if (ret != SR_OK) {
	361	sr_err("Device failed to renumerate.");
	362	return SR_ERR;
	363	}
	364	sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
	365	} else {
	366	sr_info("Firmware upload was not needed.");
	367	ret = logic16_dev_open(sdi);
	368	}
	369
	370	if (ret != SR_OK) {
	371	sr_err("Unable to open device.");
	372	return SR_ERR;
	373	}
	374
	375	if (devc->cur_samplerate == 0) {
	376	/* Samplerate hasn't been set; default to the slowest one. */
	377	devc->cur_samplerate = samplerates[0];
	378	}
	379
	380	return SR_OK;
	381	}
	382
	383	static int dev_close(struct sr_dev_inst *sdi)
	384	{
	385	struct sr_usb_dev_inst *usb;
	386
	387	usb = sdi->conn;
	388
	389	if (!usb->devhdl)
	390	return SR_ERR_BUG;
	391
	392	sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
	393	usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
	394	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	395	libusb_close(usb->devhdl);
	396	usb->devhdl = NULL;
	397
	398	return SR_OK;
	399	}
	400
	401	static int config_get(uint32_t key, GVariant **data,
	402	const struct sr_dev_inst sdi, const struct sr_channel_group cg)
	403	{
	404	struct dev_context *devc;
	405	struct sr_usb_dev_inst *usb;
	406	unsigned int i;
	407
	408	(void)cg;
	409
	410	switch (key) {
	411	case SR_CONF_CONN:
	412	if (!sdi \|\| !sdi->conn)
	413	return SR_ERR_ARG;
	414	usb = sdi->conn;
	415	if (usb->address == 255)
	416	/* Device still needs to re-enumerate after firmware
	417	* upload, so we don't know its (future) address. */
	418	return SR_ERR;
	419	*data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
	420	break;
	421	case SR_CONF_SAMPLERATE:
	422	if (!sdi)
	423	return SR_ERR;
	424	devc = sdi->priv;
	425	*data = g_variant_new_uint64(devc->cur_samplerate);
	426	break;
	427	case SR_CONF_CAPTURE_RATIO:
	428	if (!sdi)
	429	return SR_ERR;
	430	devc = sdi->priv;
	431	*data = g_variant_new_uint64(devc->capture_ratio);
	432	break;
	433	case SR_CONF_VOLTAGE_THRESHOLD:
	434	if (!sdi)
	435	return SR_ERR;
	436	devc = sdi->priv;
	437	for (i = 0; i < ARRAY_SIZE(thresholds); i++) {
	438	if (devc->selected_voltage_range != thresholds_ranges[i].range)
	439	continue;
	440	*data = std_gvar_tuple_double(thresholds[i][0], thresholds[i][1]);
	441	return SR_OK;
	442	}
	443	return SR_ERR;
	444	default:
	445	return SR_ERR_NA;
	446	}
	447
	448	return SR_OK;
	449	}
	450
	451	static int config_set(uint32_t key, GVariant *data,
	452	const struct sr_dev_inst sdi, const struct sr_channel_group cg)
	453	{
	454	struct dev_context *devc;
	455	int idx;
	456
	457	(void)cg;
	458
	459	devc = sdi->priv;
	460
	461	switch (key) {
	462	case SR_CONF_SAMPLERATE:
	463	devc->cur_samplerate = g_variant_get_uint64(data);
	464	break;
	465	case SR_CONF_LIMIT_SAMPLES:
	466	devc->limit_samples = g_variant_get_uint64(data);
	467	break;
	468	case SR_CONF_CAPTURE_RATIO:
	469	devc->capture_ratio = g_variant_get_uint64(data);
	470	break;
	471	case SR_CONF_VOLTAGE_THRESHOLD:
	472	if ((idx = std_double_tuple_idx(data, ARRAY_AND_SIZE(thresholds))) < 0)
	473	return SR_ERR_ARG;
	474	devc->selected_voltage_range = thresholds_ranges[idx].range;
	475	break;
	476	default:
	477	return SR_ERR_NA;
	478	}
	479
	480	return SR_OK;
	481	}
	482
	483	static int config_list(uint32_t key, GVariant **data,
	484	const struct sr_dev_inst sdi, const struct sr_channel_group cg)
	485	{
	486	switch (key) {
	487	case SR_CONF_SCAN_OPTIONS:
	488	case SR_CONF_DEVICE_OPTIONS:
	489	return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
	490	case SR_CONF_SAMPLERATE:
	491	*data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
	492	break;
	493	case SR_CONF_VOLTAGE_THRESHOLD:
	494	*data = std_gvar_thresholds(ARRAY_AND_SIZE(thresholds));
	495	break;
	496	case SR_CONF_TRIGGER_MATCH:
	497	*data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
	498	break;
	499	default:
	500	return SR_ERR_NA;
	501	}
	502
	503	return SR_OK;
	504	}
	505
	506	static void abort_acquisition(struct dev_context *devc)
	507	{
	508	int i;
	509
	510	devc->sent_samples = -1;
	511
	512	for (i = devc->num_transfers - 1; i >= 0; i--) {
	513	if (devc->transfers[i])
	514	libusb_cancel_transfer(devc->transfers[i]);
	515	}
	516	}
	517
	518	static unsigned int bytes_per_ms(struct dev_context *devc)
	519	{
	520	return devc->cur_samplerate * devc->num_channels / 8000;
	521	}
	522
	523	static size_t get_buffer_size(struct dev_context *devc)
	524	{
	525	size_t s;
	526
	527	/*
	528	* The buffer should be large enough to hold 10ms of data and
	529	* a multiple of 512.
	530	*/
	531	s = 10 * bytes_per_ms(devc);
	532	return (s + 511) & ~511;
	533	}
	534
	535	static unsigned int get_number_of_transfers(struct dev_context *devc)
	536	{
	537	unsigned int n;
	538
	539	/* Total buffer size should be able to hold about 500ms of data. */
	540	n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
	541
	542	if (n > NUM_SIMUL_TRANSFERS)
	543	return NUM_SIMUL_TRANSFERS;
	544
	545	return n;
	546	}
	547
	548	static unsigned int get_timeout(struct dev_context *devc)
	549	{
	550	size_t total_size;
	551	unsigned int timeout;
	552
	553	total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
	554	timeout = total_size / bytes_per_ms(devc);
	555	return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
	556	}
	557
	558	static int configure_channels(const struct sr_dev_inst *sdi)
	559	{
	560	struct dev_context *devc;
	561	struct sr_channel *ch;
	562	GSList *l;
	563	uint16_t channel_bit;
	564
	565	devc = sdi->priv;
	566
	567	devc->cur_channels = 0;
	568	devc->num_channels = 0;
	569	for (l = sdi->channels; l; l = l->next) {
	570	ch = (struct sr_channel *)l->data;
	571	if (ch->enabled == FALSE)
	572	continue;
	573
	574	channel_bit = 1 << (ch->index);
	575
	576	devc->cur_channels \|= channel_bit;
	577
	578	#ifdef WORDS_BIGENDIAN
	579	/*
	580	* Output logic data should be stored in little endian format.
	581	* To speed things up during conversion, do the switcharoo
	582	* here instead.
	583	*/
	584	channel_bit = 1 << (ch->index ^ 8);
	585	#endif
	586
	587	devc->channel_masks[devc->num_channels++] = channel_bit;
	588	}
	589
	590	return SR_OK;
	591	}
	592
	593	static int receive_data(int fd, int revents, void *cb_data)
	594	{
	595	struct timeval tv;
	596	struct dev_context *devc;
	597	struct drv_context *drvc;
	598	const struct sr_dev_inst *sdi;
	599	struct sr_dev_driver *di;
	600
	601	(void)fd;
	602	(void)revents;
	603
	604	sdi = cb_data;
	605	di = sdi->driver;
	606	drvc = di->context;
	607	devc = sdi->priv;
	608
	609	tv.tv_sec = tv.tv_usec = 0;
	610	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	611
	612	if (devc->sent_samples == -2) {
	613	logic16_abort_acquisition(sdi);
	614	abort_acquisition(devc);
	615	}
	616
	617	return TRUE;
	618	}
	619
	620	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	621	{
	622	struct sr_dev_driver *di = sdi->driver;
	623	struct dev_context *devc;
	624	struct drv_context *drvc;
	625	struct sr_usb_dev_inst *usb;
	626	struct sr_trigger *trigger;
	627	struct libusb_transfer *transfer;
	628	unsigned int i, timeout, num_transfers;
	629	int ret;
	630	unsigned char *buf;
	631	size_t size, convsize;
	632
	633	drvc = di->context;
	634	devc = sdi->priv;
	635	usb = sdi->conn;
	636
	637	/* Configures devc->cur_channels. */
	638	if (configure_channels(sdi) != SR_OK) {
	639	sr_err("Failed to configure channels.");
	640	return SR_ERR;
	641	}
	642
	643	devc->sent_samples = 0;
	644	devc->empty_transfer_count = 0;
	645	devc->cur_channel = 0;
	646	memset(devc->channel_data, 0, sizeof(devc->channel_data));
	647
	648	if ((trigger = sr_session_trigger_get(sdi->session))) {
	649	int pre_trigger_samples = 0;
	650	if (devc->limit_samples > 0)
	651	pre_trigger_samples = (devc->capture_ratio * devc->limit_samples) / 100;
	652	devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
	653	if (!devc->stl)
	654	return SR_ERR_MALLOC;
	655	devc->trigger_fired = FALSE;
	656	} else
	657	devc->trigger_fired = TRUE;
	658
	659	timeout = get_timeout(devc);
	660	num_transfers = get_number_of_transfers(devc);
	661	size = get_buffer_size(devc);
	662	convsize = (size / devc->num_channels + 2) * 16;
	663	devc->submitted_transfers = 0;
	664
	665	devc->convbuffer_size = convsize;
	666	if (!(devc->convbuffer = g_try_malloc(convsize))) {
	667	sr_err("Conversion buffer malloc failed.");
	668	return SR_ERR_MALLOC;
	669	}
	670
	671	devc->transfers = g_try_malloc0(sizeof(devc->transfers) num_transfers);
	672	if (!devc->transfers) {
	673	sr_err("USB transfers malloc failed.");
	674	g_free(devc->convbuffer);
	675	return SR_ERR_MALLOC;
	676	}
	677
	678	if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
	679	devc->cur_channels)) != SR_OK) {
	680	g_free(devc->transfers);
	681	g_free(devc->convbuffer);
	682	return ret;
	683	}
	684
	685	devc->num_transfers = num_transfers;
	686	for (i = 0; i < num_transfers; i++) {
	687	if (!(buf = g_try_malloc(size))) {
	688	sr_err("USB transfer buffer malloc failed.");
	689	if (devc->submitted_transfers)
	690	abort_acquisition(devc);
	691	else {
	692	g_free(devc->transfers);
	693	g_free(devc->convbuffer);
	694	}
	695	return SR_ERR_MALLOC;
	696	}
	697	transfer = libusb_alloc_transfer(0);
	698	libusb_fill_bulk_transfer(transfer, usb->devhdl,
	699	2 \| LIBUSB_ENDPOINT_IN, buf, size,
	700	logic16_receive_transfer, (void *)sdi, timeout);
	701	if ((ret = libusb_submit_transfer(transfer)) != 0) {
	702	sr_err("Failed to submit transfer: %s.",
	703	libusb_error_name(ret));
	704	libusb_free_transfer(transfer);
	705	g_free(buf);
	706	abort_acquisition(devc);
	707	return SR_ERR;
	708	}
	709	devc->transfers[i] = transfer;
	710	devc->submitted_transfers++;
	711	}
	712
	713	devc->ctx = drvc->sr_ctx;
	714
	715	usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);
	716
	717	std_session_send_df_header(sdi);
	718
	719	if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
	720	abort_acquisition(devc);
	721	return ret;
	722	}
	723
	724	return SR_OK;
	725	}
	726
	727	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	728	{
	729	int ret;
	730
	731	ret = logic16_abort_acquisition(sdi);
	732
	733	abort_acquisition(sdi->priv);
	734
	735	return ret;
	736	}
	737
	738	static struct sr_dev_driver saleae_logic16_driver_info = {
	739	.name = "saleae-logic16",
	740	.longname = "Saleae Logic16",
	741	.api_version = 1,
	742	.init = std_init,
	743	.cleanup = std_cleanup,
	744	.scan = scan,
	745	.dev_list = std_dev_list,
	746	.dev_clear = std_dev_clear,
	747	.config_get = config_get,
	748	.config_set = config_set,
	749	.config_list = config_list,
	750	.dev_open = dev_open,
	751	.dev_close = dev_close,
	752	.dev_acquisition_start = dev_acquisition_start,
	753	.dev_acquisition_stop = dev_acquisition_stop,
	754	.context = NULL,
	755	};
	756	SR_REGISTER_DEV_DRIVER(saleae_logic16_driver_info);