[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);

		if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
			continue;

		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, name %s.", FX2_FIRMWARE);
			}
			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.
			 */
			if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
				continue;

			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	if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
	192	continue;
	193
	194	if (des.idVendor != LOGIC16_VID \|\| des.idProduct != LOGIC16_PID)
	195	continue;
	196
	197	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	198	sdi->status = SR_ST_INITIALIZING;
	199	sdi->vendor = g_strdup("Saleae");
	200	sdi->model = g_strdup("Logic16");
	201	sdi->connection_id = g_strdup(connection_id);
	202
	203	for (j = 0; j < ARRAY_SIZE(channel_names); j++)
	204	sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
	205	channel_names[j]);
	206
	207	devc = g_malloc0(sizeof(struct dev_context));
	208	devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
	209	sdi->priv = devc;
	210	devices = g_slist_append(devices, sdi);
	211
	212	if (check_conf_profile(devlist[i])) {
	213	/* Already has the firmware, so fix the new address. */
	214	sr_dbg("Found a Logic16 device.");
	215	sdi->status = SR_ST_INACTIVE;
	216	sdi->inst_type = SR_INST_USB;
	217	sdi->conn = sr_usb_dev_inst_new(
	218	libusb_get_bus_number(devlist[i]),
	219	libusb_get_device_address(devlist[i]), NULL);
	220	} else {
	221	if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
	222	USB_CONFIGURATION, FX2_FIRMWARE) == SR_OK) {
	223	/* Store when this device's FW was updated. */
	224	devc->fw_updated = g_get_monotonic_time();
	225	} else {
	226	sr_err("Firmware upload failed, name %s.", FX2_FIRMWARE);
	227	}
	228	sdi->inst_type = SR_INST_USB;
	229	sdi->conn = sr_usb_dev_inst_new(
	230	libusb_get_bus_number(devlist[i]), 0xff, NULL);
	231	}
	232	}
	233	libusb_free_device_list(devlist, 1);
	234	g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
	235
	236	return std_scan_complete(di, devices);
	237	}
	238
	239	static int logic16_dev_open(struct sr_dev_inst *sdi)
	240	{
	241	struct sr_dev_driver *di;
	242	libusb_device **devlist;
	243	struct sr_usb_dev_inst *usb;
	244	struct libusb_device_descriptor des;
	245	struct drv_context *drvc;
	246	int ret = SR_ERR, i, device_count;
	247	char connection_id[64];
	248
	249	di = sdi->driver;
	250	drvc = di->context;
	251	usb = sdi->conn;
	252
	253	device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	254	if (device_count < 0) {
	255	sr_err("Failed to get device list: %s.",
	256	libusb_error_name(device_count));
	257	return SR_ERR;
	258	}
	259
	260	for (i = 0; i < device_count; i++) {
	261	libusb_get_device_descriptor(devlist[i], &des);
	262
	263	if (des.idVendor != LOGIC16_VID \|\| des.idProduct != LOGIC16_PID)
	264	continue;
	265
	266	if ((sdi->status == SR_ST_INITIALIZING) \|\|
	267	(sdi->status == SR_ST_INACTIVE)) {
	268	/*
	269	* Check device by its physical USB bus/port address.
	270	*/
	271	if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
	272	continue;
	273
	274	if (strcmp(sdi->connection_id, connection_id))
	275	/* This is not the one. */
	276	continue;
	277	}
	278
	279	if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
	280	if (usb->address == 0xff)
	281	/*
	282	* First time we touch this device after FW
	283	* upload, so we don't know the address yet.
	284	*/
	285	usb->address = libusb_get_device_address(devlist[i]);
	286	} else {
	287	sr_err("Failed to open device: %s.",
	288	libusb_error_name(ret));
	289	ret = SR_ERR;
	290	break;
	291	}
	292
	293	ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
	294	if (ret == LIBUSB_ERROR_BUSY) {
	295	sr_err("Unable to claim USB interface. Another "
	296	"program or driver has already claimed it.");
	297	ret = SR_ERR;
	298	break;
	299	} else if (ret == LIBUSB_ERROR_NO_DEVICE) {
	300	sr_err("Device has been disconnected.");
	301	ret = SR_ERR;
	302	break;
	303	} else if (ret != 0) {
	304	sr_err("Unable to claim interface: %s.",
	305	libusb_error_name(ret));
	306	ret = SR_ERR;
	307	break;
	308	}
	309
	310	if ((ret = logic16_init_device(sdi)) != SR_OK) {
	311	sr_err("Failed to init device.");
	312	break;
	313	}
	314
	315	sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
	316	usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
	317
	318	ret = SR_OK;
	319
	320	break;
	321	}
	322
	323	libusb_free_device_list(devlist, 1);
	324
	325	if (ret != SR_OK) {
	326	if (usb->devhdl) {
	327	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	328	libusb_close(usb->devhdl);
	329	usb->devhdl = NULL;
	330	}
	331	return SR_ERR;
	332	}
	333
	334	return SR_OK;
	335	}
	336
	337	static int dev_open(struct sr_dev_inst *sdi)
	338	{
	339	struct dev_context *devc;
	340	int ret;
	341	int64_t timediff_us, timediff_ms;
	342
	343	devc = sdi->priv;
	344
	345	/*
	346	* If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
	347	* milliseconds for the FX2 to renumerate.
	348	*/
	349	ret = SR_ERR;
	350	if (devc->fw_updated > 0) {
	351	sr_info("Waiting for device to reset.");
	352	/* Takes >= 300ms for the FX2 to be gone from the USB bus. */
	353	g_usleep(300 * 1000);
	354	timediff_ms = 0;
	355	while (timediff_ms < MAX_RENUM_DELAY_MS) {
	356	if ((ret = logic16_dev_open(sdi)) == SR_OK)
	357	break;
	358	g_usleep(100 * 1000);
	359
	360	timediff_us = g_get_monotonic_time() - devc->fw_updated;
	361	timediff_ms = timediff_us / 1000;
	362	sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
	363	}
	364	if (ret != SR_OK) {
	365	sr_err("Device failed to renumerate.");
	366	return SR_ERR;
	367	}
	368	sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
	369	} else {
	370	sr_info("Firmware upload was not needed.");
	371	ret = logic16_dev_open(sdi);
	372	}
	373
	374	if (ret != SR_OK) {
	375	sr_err("Unable to open device.");
	376	return SR_ERR;
	377	}
	378
	379	if (devc->cur_samplerate == 0) {
	380	/* Samplerate hasn't been set; default to the slowest one. */
	381	devc->cur_samplerate = samplerates[0];
	382	}
	383
	384	return SR_OK;
	385	}
	386
	387	static int dev_close(struct sr_dev_inst *sdi)
	388	{
	389	struct sr_usb_dev_inst *usb;
	390
	391	usb = sdi->conn;
	392
	393	if (!usb->devhdl)
	394	return SR_ERR_BUG;
	395
	396	sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
	397	usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
	398	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	399	libusb_close(usb->devhdl);
	400	usb->devhdl = NULL;
	401
	402	return SR_OK;
	403	}
	404
	405	static int config_get(uint32_t key, GVariant **data,
	406	const struct sr_dev_inst sdi, const struct sr_channel_group cg)
	407	{
	408	struct dev_context *devc;
	409	struct sr_usb_dev_inst *usb;
	410	unsigned int i;
	411
	412	(void)cg;
	413
	414	switch (key) {
	415	case SR_CONF_CONN:
	416	if (!sdi \|\| !sdi->conn)
	417	return SR_ERR_ARG;
	418	usb = sdi->conn;
	419	if (usb->address == 255)
	420	/* Device still needs to re-enumerate after firmware
	421	* upload, so we don't know its (future) address. */
	422	return SR_ERR;
	423	*data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
	424	break;
	425	case SR_CONF_SAMPLERATE:
	426	if (!sdi)
	427	return SR_ERR;
	428	devc = sdi->priv;
	429	*data = g_variant_new_uint64(devc->cur_samplerate);
	430	break;
	431	case SR_CONF_CAPTURE_RATIO:
	432	if (!sdi)
	433	return SR_ERR;
	434	devc = sdi->priv;
	435	*data = g_variant_new_uint64(devc->capture_ratio);
	436	break;
	437	case SR_CONF_VOLTAGE_THRESHOLD:
	438	if (!sdi)
	439	return SR_ERR;
	440	devc = sdi->priv;
	441	for (i = 0; i < ARRAY_SIZE(thresholds); i++) {
	442	if (devc->selected_voltage_range != thresholds_ranges[i].range)
	443	continue;
	444	*data = std_gvar_tuple_double(thresholds[i][0], thresholds[i][1]);
	445	return SR_OK;
	446	}
	447	return SR_ERR;
	448	default:
	449	return SR_ERR_NA;
	450	}
	451
	452	return SR_OK;
	453	}
	454
	455	static int config_set(uint32_t key, GVariant *data,
	456	const struct sr_dev_inst sdi, const struct sr_channel_group cg)
	457	{
	458	struct dev_context *devc;
	459	int idx;
	460
	461	(void)cg;
	462
	463	devc = sdi->priv;
	464
	465	switch (key) {
	466	case SR_CONF_SAMPLERATE:
	467	devc->cur_samplerate = g_variant_get_uint64(data);
	468	break;
	469	case SR_CONF_LIMIT_SAMPLES:
	470	devc->limit_samples = g_variant_get_uint64(data);
	471	break;
	472	case SR_CONF_CAPTURE_RATIO:
	473	devc->capture_ratio = g_variant_get_uint64(data);
	474	break;
	475	case SR_CONF_VOLTAGE_THRESHOLD:
	476	if ((idx = std_double_tuple_idx(data, ARRAY_AND_SIZE(thresholds))) < 0)
	477	return SR_ERR_ARG;
	478	devc->selected_voltage_range = thresholds_ranges[idx].range;
	479	break;
	480	default:
	481	return SR_ERR_NA;
	482	}
	483
	484	return SR_OK;
	485	}
	486
	487	static int config_list(uint32_t key, GVariant **data,
	488	const struct sr_dev_inst sdi, const struct sr_channel_group cg)
	489	{
	490	switch (key) {
	491	case SR_CONF_SCAN_OPTIONS:
	492	case SR_CONF_DEVICE_OPTIONS:
	493	return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
	494	case SR_CONF_SAMPLERATE:
	495	*data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
	496	break;
	497	case SR_CONF_VOLTAGE_THRESHOLD:
	498	*data = std_gvar_thresholds(ARRAY_AND_SIZE(thresholds));
	499	break;
	500	case SR_CONF_TRIGGER_MATCH:
	501	*data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
	502	break;
	503	default:
	504	return SR_ERR_NA;
	505	}
	506
	507	return SR_OK;
	508	}
	509
	510	static void abort_acquisition(struct dev_context *devc)
	511	{
	512	int i;
	513
	514	devc->sent_samples = -1;
	515
	516	for (i = devc->num_transfers - 1; i >= 0; i--) {
	517	if (devc->transfers[i])
	518	libusb_cancel_transfer(devc->transfers[i]);
	519	}
	520	}
	521
	522	static unsigned int bytes_per_ms(struct dev_context *devc)
	523	{
	524	return devc->cur_samplerate * devc->num_channels / 8000;
	525	}
	526
	527	static size_t get_buffer_size(struct dev_context *devc)
	528	{
	529	size_t s;
	530
	531	/*
	532	* The buffer should be large enough to hold 10ms of data and
	533	* a multiple of 512.
	534	*/
	535	s = 10 * bytes_per_ms(devc);
	536	return (s + 511) & ~511;
	537	}
	538
	539	static unsigned int get_number_of_transfers(struct dev_context *devc)
	540	{
	541	unsigned int n;
	542
	543	/* Total buffer size should be able to hold about 500ms of data. */
	544	n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
	545
	546	if (n > NUM_SIMUL_TRANSFERS)
	547	return NUM_SIMUL_TRANSFERS;
	548
	549	return n;
	550	}
	551
	552	static unsigned int get_timeout(struct dev_context *devc)
	553	{
	554	size_t total_size;
	555	unsigned int timeout;
	556
	557	total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
	558	timeout = total_size / bytes_per_ms(devc);
	559	return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
	560	}
	561
	562	static int configure_channels(const struct sr_dev_inst *sdi)
	563	{
	564	struct dev_context *devc;
	565	struct sr_channel *ch;
	566	GSList *l;
	567	uint16_t channel_bit;
	568
	569	devc = sdi->priv;
	570
	571	devc->cur_channels = 0;
	572	devc->num_channels = 0;
	573	for (l = sdi->channels; l; l = l->next) {
	574	ch = (struct sr_channel *)l->data;
	575	if (ch->enabled == FALSE)
	576	continue;
	577
	578	channel_bit = 1 << (ch->index);
	579
	580	devc->cur_channels \|= channel_bit;
	581
	582	#ifdef WORDS_BIGENDIAN
	583	/*
	584	* Output logic data should be stored in little endian format.
	585	* To speed things up during conversion, do the switcharoo
	586	* here instead.
	587	*/
	588	channel_bit = 1 << (ch->index ^ 8);
	589	#endif
	590
	591	devc->channel_masks[devc->num_channels++] = channel_bit;
	592	}
	593
	594	return SR_OK;
	595	}
	596
	597	static int receive_data(int fd, int revents, void *cb_data)
	598	{
	599	struct timeval tv;
	600	struct dev_context *devc;
	601	struct drv_context *drvc;
	602	const struct sr_dev_inst *sdi;
	603	struct sr_dev_driver *di;
	604
	605	(void)fd;
	606	(void)revents;
	607
	608	sdi = cb_data;
	609	di = sdi->driver;
	610	drvc = di->context;
	611	devc = sdi->priv;
	612
	613	tv.tv_sec = tv.tv_usec = 0;
	614	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	615
	616	if (devc->sent_samples == -2) {
	617	logic16_abort_acquisition(sdi);
	618	abort_acquisition(devc);
	619	}
	620
	621	return TRUE;
	622	}
	623
	624	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	625	{
	626	struct sr_dev_driver *di = sdi->driver;
	627	struct dev_context *devc;
	628	struct drv_context *drvc;
	629	struct sr_usb_dev_inst *usb;
	630	struct sr_trigger *trigger;
	631	struct libusb_transfer *transfer;
	632	unsigned int i, timeout, num_transfers;
	633	int ret;
	634	unsigned char *buf;
	635	size_t size, convsize;
	636
	637	drvc = di->context;
	638	devc = sdi->priv;
	639	usb = sdi->conn;
	640
	641	/* Configures devc->cur_channels. */
	642	if (configure_channels(sdi) != SR_OK) {
	643	sr_err("Failed to configure channels.");
	644	return SR_ERR;
	645	}
	646
	647	devc->sent_samples = 0;
	648	devc->empty_transfer_count = 0;
	649	devc->cur_channel = 0;
	650	memset(devc->channel_data, 0, sizeof(devc->channel_data));
	651
	652	if ((trigger = sr_session_trigger_get(sdi->session))) {
	653	int pre_trigger_samples = 0;
	654	if (devc->limit_samples > 0)
	655	pre_trigger_samples = (devc->capture_ratio * devc->limit_samples) / 100;
	656	devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
	657	if (!devc->stl)
	658	return SR_ERR_MALLOC;
	659	devc->trigger_fired = FALSE;
	660	} else
	661	devc->trigger_fired = TRUE;
	662
	663	timeout = get_timeout(devc);
	664	num_transfers = get_number_of_transfers(devc);
	665	size = get_buffer_size(devc);
	666	convsize = (size / devc->num_channels + 2) * 16;
	667	devc->submitted_transfers = 0;
	668
	669	devc->convbuffer_size = convsize;
	670	if (!(devc->convbuffer = g_try_malloc(convsize))) {
	671	sr_err("Conversion buffer malloc failed.");
	672	return SR_ERR_MALLOC;
	673	}
	674
	675	devc->transfers = g_try_malloc0(sizeof(devc->transfers) num_transfers);
	676	if (!devc->transfers) {
	677	sr_err("USB transfers malloc failed.");
	678	g_free(devc->convbuffer);
	679	return SR_ERR_MALLOC;
	680	}
	681
	682	if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
	683	devc->cur_channels)) != SR_OK) {
	684	g_free(devc->transfers);
	685	g_free(devc->convbuffer);
	686	return ret;
	687	}
	688
	689	devc->num_transfers = num_transfers;
	690	for (i = 0; i < num_transfers; i++) {
	691	if (!(buf = g_try_malloc(size))) {
	692	sr_err("USB transfer buffer malloc failed.");
	693	if (devc->submitted_transfers)
	694	abort_acquisition(devc);
	695	else {
	696	g_free(devc->transfers);
	697	g_free(devc->convbuffer);
	698	}
	699	return SR_ERR_MALLOC;
	700	}
	701	transfer = libusb_alloc_transfer(0);
	702	libusb_fill_bulk_transfer(transfer, usb->devhdl,
	703	2 \| LIBUSB_ENDPOINT_IN, buf, size,
	704	logic16_receive_transfer, (void *)sdi, timeout);
	705	if ((ret = libusb_submit_transfer(transfer)) != 0) {
	706	sr_err("Failed to submit transfer: %s.",
	707	libusb_error_name(ret));
	708	libusb_free_transfer(transfer);
	709	g_free(buf);
	710	abort_acquisition(devc);
	711	return SR_ERR;
	712	}
	713	devc->transfers[i] = transfer;
	714	devc->submitted_transfers++;
	715	}
	716
	717	devc->ctx = drvc->sr_ctx;
	718
	719	usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);
	720
	721	std_session_send_df_header(sdi);
	722
	723	if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
	724	abort_acquisition(devc);
	725	return ret;
	726	}
	727
	728	return SR_OK;
	729	}
	730
	731	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	732	{
	733	int ret;
	734
	735	ret = logic16_abort_acquisition(sdi);
	736
	737	abort_acquisition(sdi->priv);
	738
	739	return ret;
	740	}
	741
	742	static struct sr_dev_driver saleae_logic16_driver_info = {
	743	.name = "saleae-logic16",
	744	.longname = "Saleae Logic16",
	745	.api_version = 1,
	746	.init = std_init,
	747	.cleanup = std_cleanup,
	748	.scan = scan,
	749	.dev_list = std_dev_list,
	750	.dev_clear = std_dev_clear,
	751	.config_get = config_get,
	752	.config_set = config_set,
	753	.config_list = config_list,
	754	.dev_open = dev_open,
	755	.dev_close = dev_close,
	756	.dev_acquisition_start = dev_acquisition_start,
	757	.dev_acquisition_stop = dev_acquisition_stop,
	758	.context = NULL,
	759	};
	760	SR_REGISTER_DEV_DRIVER(saleae_logic16_driver_info);