[libsigrok.git] / hardware / hantek-dso / api.c

/*
 * This file is part of the sigrok 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 <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <sys/time.h>
#include <inttypes.h>
#include <arpa/inet.h>
#include <glib.h>
#include <libusb.h>
#include "sigrok.h"
#include "sigrok-internal.h"
#include "config.h"
#include "dso.h"


/* Max time in ms before we want to check on events */
#define TICK    1

static int capabilities[] = {
	SR_HWCAP_OSCILLOSCOPE,
	SR_HWCAP_LIMIT_SAMPLES,
	SR_HWCAP_CONTINUOUS,
	SR_HWCAP_TIMEBASE,
	SR_HWCAP_BUFFERSIZE,
	SR_HWCAP_TRIGGER_SOURCE,
	SR_HWCAP_TRIGGER_SLOPE,
	SR_HWCAP_HORIZ_TRIGGERPOS,
	SR_HWCAP_FILTER,
	0,
};

static const char *probe_names[] = {
	"CH1",
	"CH2",
	NULL,
};

static struct dso_profile dev_profiles[] = {
	{	0x04b4, 0x2090,
		0x04b5, 0x2090,
		"Hantek", "DSO-2090",
		NULL, 2,
		FIRMWARE_DIR "/hantek-dso-2090.fw" },
	{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }
};

static uint64_t buffersizes[] = {
	10240,
	32768,
	/* TODO: 65535 */
	0
};

static struct sr_rational timebases[] = {
	/* microseconds */
	{ 10, 1000000 },
	{ 20, 1000000 },
	{ 40, 1000000 },
	{ 100, 1000000 },
	{ 200, 1000000 },
	{ 400, 1000000 },
	/* milliseconds */
	{ 1, 1000 },
	{ 2, 1000 },
	{ 4, 1000 },
	{ 10, 1000 },
	{ 20, 1000 },
	{ 40, 1000 },
	{ 100, 1000 },
	{ 200, 1000 },
	{ 400, 1000 },
	{0,0}
};

static char *trigger_sources[] = {
	"CH1",
	"CH2",
	"EXT",
	NULL
};

static char *filter_targets[] = {
	"CH1",
	"CH2",
	/* TODO: "TRIGGER", */
	NULL
};

SR_PRIV libusb_context *usb_context = NULL;
SR_PRIV GSList *dev_insts = NULL;


static struct sr_dev_inst *dso_dev_new(int index, struct dso_profile *prof)
{
	struct sr_dev_inst *sdi;
	struct context *ctx;

	sdi = sr_dev_inst_new(index, SR_ST_INITIALIZING,
		prof->vendor, prof->model, prof->model_version);
	if (!sdi)
		return NULL;

	if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
		sr_err("hantek-dso: ctx malloc failed");
		return NULL;
	}
	ctx->profile = prof;
	ctx->dev_state = IDLE;
	ctx->timebase = DEFAULT_TIMEBASE;
	ctx->ch1_enabled = TRUE;
	ctx->ch2_enabled = TRUE;
	ctx->voltage_ch1 = DEFAULT_VOLTAGE;
	ctx->voltage_ch2 = DEFAULT_VOLTAGE;
	ctx->coupling_ch1 = DEFAULT_COUPLING;
	ctx->coupling_ch2 = DEFAULT_COUPLING;
	ctx->voffset_ch1 = DEFAULT_VERT_OFFSET;
	ctx->voffset_ch2 = DEFAULT_VERT_OFFSET;
	ctx->voffset_trigger = DEFAULT_VERT_TRIGGERPOS;
	ctx->framesize = DEFAULT_FRAMESIZE;
	ctx->triggerslope = SLOPE_POSITIVE;
	ctx->triggersource = g_strdup(DEFAULT_TRIGGER_SOURCE);
	ctx->triggerposition = DEFAULT_HORIZ_TRIGGERPOS;
	sdi->priv = ctx;
	dev_insts = g_slist_append(dev_insts, sdi);

	return sdi;
}

static int configure_probes(struct context *ctx, GSList *probes)
{
	struct sr_probe *probe;
	GSList *l;

	ctx->ch1_enabled = ctx->ch2_enabled = FALSE;
	for (l = probes; l; l = l->next) {
		probe = (struct sr_probe *)l->data;
		if (probe->index == 1)
			ctx->ch1_enabled = probe->enabled;
		else if (probe->index == 2)
			ctx->ch2_enabled = probe->enabled;
	}

	return SR_OK;
}

static int hw_init(const char *devinfo)
{
	struct sr_dev_inst *sdi;
	struct libusb_device_descriptor des;
	struct dso_profile *prof;
	struct context *ctx;
	libusb_device **devlist;
	int err, devcnt, i, j;

	/* Avoid compiler warnings. */
	(void)devinfo;

	if (libusb_init(&usb_context) != 0) {
		sr_err("hantek-dso: Failed to initialize USB.");
		return 0;
	}

	/* Find all Hantek DSO devices and upload firmware to all of them. */
	devcnt = 0;
	libusb_get_device_list(usb_context, &devlist);
	for (i = 0; devlist[i]; i++) {
		if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
			sr_err("hantek-dso: failed to get device descriptor: %d", err);
			continue;
		}

		prof = NULL;
		for (j = 0; dev_profiles[j].orig_vid; j++) {
			if (des.idVendor == dev_profiles[j].orig_vid
				&& des.idProduct == dev_profiles[j].orig_pid) {
				/* Device matches the pre-firmware profile. */
				prof = &dev_profiles[j];
				sr_dbg("hantek-dso: Found a %s %s.", prof->vendor, prof->model);
				sdi = dso_dev_new(devcnt, prof);
				ctx = sdi->priv;
				if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
						prof->firmware) == SR_OK)
					/* Remember when the firmware on this device was updated */
					g_get_current_time(&ctx->fw_updated);
				else
					sr_err("hantek-dso: firmware upload failed for "
					       "device %d", devcnt);
				/* Dummy USB address of 0xff will get overwritten later. */
				ctx->usb = sr_usb_dev_inst_new(
						libusb_get_bus_number(devlist[i]), 0xff, NULL);
				devcnt++;
				break;
			} else if (des.idVendor == dev_profiles[j].fw_vid
				&& des.idProduct == dev_profiles[j].fw_pid) {
				/* Device matches the post-firmware profile. */
				prof = &dev_profiles[j];
				sr_dbg("hantek-dso: Found a %s %s.", prof->vendor, prof->model);
				sdi = dso_dev_new(devcnt, prof);
				sdi->status = SR_ST_INACTIVE;
				ctx = sdi->priv;
				ctx->usb = sr_usb_dev_inst_new(
						libusb_get_bus_number(devlist[i]),
						libusb_get_device_address(devlist[i]), NULL);
				devcnt++;
				break;
			}
		}
		if (!prof)
			/* not a supported VID/PID */
			continue;
	}
	libusb_free_device_list(devlist, 1);

	return devcnt;
}

static int hw_dev_open(int dev_index)
{
	GTimeVal cur_time;
	struct sr_dev_inst *sdi;
	struct context *ctx;
	int timediff, err;

	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
		return SR_ERR_ARG;
	ctx = sdi->priv;

	/*
	 * if the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
	 * for the FX2 to renumerate
	 */
	err = 0;
	if (GTV_TO_MSEC(ctx->fw_updated) > 0) {
		sr_info("hantek-dso: waiting for device to reset");
		/* takes at least 300ms for the FX2 to be gone from the USB bus */
		g_usleep(300 * 1000);
		timediff = 0;
		while (timediff < MAX_RENUM_DELAY) {
			if ((err = dso_open(dev_index)) == SR_OK)
				break;
			g_usleep(100 * 1000);
			g_get_current_time(&cur_time);
			timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(ctx->fw_updated);
		}
		sr_info("hantek-dso: device came back after %d ms", timediff);
	} else {
		err = dso_open(dev_index);
	}

	if (err != SR_OK) {
		sr_err("hantek-dso: unable to open device");
		return SR_ERR;
	}

	err = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
	if (err != 0) {
		sr_err("hantek-dso: Unable to claim interface: %d", err);
		return SR_ERR;
	}

	return SR_OK;
}

static int hw_dev_close(int dev_index)
{
	struct sr_dev_inst *sdi;

	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
		return SR_ERR_ARG;

	dso_close(sdi);

	return SR_OK;
}

static int hw_cleanup(void)
{
	GSList *l;
	struct sr_dev_inst *sdi;
	struct context *ctx;

	/* Properly close and free all devices. */
	for (l = dev_insts; l; l = l->next) {
		if (!(sdi = l->data)) {
			/* Log error, but continue cleaning up the rest. */
			sr_err("hantek-dso: %s: sdi was NULL, continuing", __func__);
			continue;
		}
		if (!(ctx = sdi->priv)) {
			/* Log error, but continue cleaning up the rest. */
			sr_err("hantek-dso: %s: sdi->priv was NULL, continuing", __func__);
			continue;
		}
		dso_close(sdi);
		sr_usb_dev_inst_free(ctx->usb);
		g_free(ctx->triggersource);

		sr_dev_inst_free(sdi);
	}

	g_slist_free(dev_insts);
	dev_insts = NULL;

	if (usb_context)
		libusb_exit(usb_context);
	usb_context = NULL;

	return SR_OK;
}

static void *hw_get_device_info(int dev_index, int dev_info_id)
{
	struct sr_dev_inst *sdi;
	struct context *ctx;
	void *info;
	uint64_t tmp;

	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
		return NULL;
	ctx = sdi->priv;

	info = NULL;
	switch (dev_info_id) {
	case SR_DI_INST:
		info = sdi;
		break;
	case SR_DI_NUM_PROBES:
		info = GINT_TO_POINTER(ctx->profile->num_probes);
		break;
	case SR_DI_PROBE_NAMES:
		info = probe_names;
		break;
	case SR_DI_BUFFERSIZES:
		info = buffersizes;
		break;
	case SR_DI_TIMEBASES:
		info = timebases;
		break;
	case SR_DI_TRIGGER_SOURCES:
		info = trigger_sources;
		break;
	case SR_DI_FILTERS:
		info = filter_targets;
		break;
	/* TODO remove this */
	case SR_DI_CUR_SAMPLERATE:
		info = &tmp;
		break;
	}

	return info;
}

static int hw_get_status(int device_index)
{
	struct sr_dev_inst *sdi;

	if (!(sdi = sr_dev_inst_get(dev_insts, device_index)))
		return SR_ST_NOT_FOUND;

	return sdi->status;
}

static int *hwcap_get_all(void)
{

	return capabilities;
}

static int hw_dev_config_set(int dev_index, int hwcap, void *value)
{
	struct sr_dev_inst *sdi;
	struct context *ctx;
	struct sr_rational tmp_rat;
	float tmp_float;
	uint64_t tmp_u64;
	int ret, i;
	char *tmp_str, **targets;

	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
		return SR_ERR;

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

	ret = SR_OK;
	ctx = sdi->priv;
	switch (hwcap) {
	case SR_HWCAP_LIMIT_FRAMES:
		ctx->limit_frames = *(uint64_t *)value;
		break;
	case SR_HWCAP_PROBECONFIG:
		ret = configure_probes(ctx, (GSList *) value);
		break;
	case SR_HWCAP_TRIGGER_SLOPE:
		tmp_u64 = *(int *)value;
		if (tmp_u64 != SLOPE_NEGATIVE && tmp_u64 != SLOPE_POSITIVE)
			ret = SR_ERR_ARG;
		ctx->triggerslope = tmp_u64;
		break;
	case SR_HWCAP_HORIZ_TRIGGERPOS:
		tmp_float = *(float *)value;
		if (tmp_float < 0.0 || tmp_float > 1.0) {
			sr_err("hantek-dso: trigger position should be between 0.0 and 1.0");
			ret = SR_ERR_ARG;
		} else
			ctx->triggerposition = tmp_float;
		break;
	case SR_HWCAP_BUFFERSIZE:
		tmp_u64 = *(int *)value;
		for (i = 0; buffersizes[i]; i++) {
			if (buffersizes[i] == tmp_u64) {
				ctx->framesize = tmp_u64;
				break;
			}
		}
		if (buffersizes[i] == 0)
			ret = SR_ERR_ARG;
		break;
	case SR_HWCAP_TIMEBASE:
		tmp_rat = *(struct sr_rational *)value;
		for (i = 0; timebases[i].p && timebases[i].q; i++) {
			if (timebases[i].p == tmp_rat.p
					&& timebases[i].q == tmp_rat.q) {
				ctx->timebase = i;
				break;
			}
		}
		if (timebases[i].p == 0 && timebases[i].q == 0)
			ret = SR_ERR_ARG;
		break;
	case SR_HWCAP_TRIGGER_SOURCE:
		tmp_str = value;
		for (i = 0; trigger_sources[i]; i++) {
			if (!strcmp(tmp_str, trigger_sources[i])) {
				ctx->triggersource = g_strdup(tmp_str);
				break;
			}
		}
		if (trigger_sources[i] == 0)
			ret = SR_ERR_ARG;
		break;
	case SR_HWCAP_FILTER:
		ctx->filter_ch1 = ctx->filter_ch2 = ctx->filter_trigger = 0;
		targets = g_strsplit(value, ",", 0);
		for (i = 0; targets[i]; i++) {
			if (targets[i] == '\0')
				/* Empty filter string can be used to clear them all. */
				;
			else if (!strcmp(targets[i], "CH1"))
				ctx->filter_ch1 = TRUE;
			else if (!strcmp(targets[i], "CH2"))
				ctx->filter_ch2 = TRUE;
			else if (!strcmp(targets[i], "TRIGGER"))
				ctx->filter_trigger = TRUE;
			else {
				sr_err("invalid filter target %s", targets[i]);
				ret = SR_ERR_ARG;
			}
		}
		g_strfreev(targets);
		break;
	default:
		ret = SR_ERR_ARG;
	}

	return ret;
}

/* Called by libusb (as triggered by handle_event()) when a transfer comes in.
 * Only channel data comes in asynchronously, and all transfers for this are
 * queued up beforehand, so this just needs so chuck the incoming data onto
 * the libsigrok session bus.
 */
static void receive_transfer(struct libusb_transfer *transfer)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_analog analog;
	struct context *ctx;
	float ch1, ch2;
	int num_probes, data_offset, i;

	ctx = transfer->user_data;
	sr_dbg("hantek-dso: receive_transfer(): status %d received %d bytes",
			transfer->status, transfer->actual_length);

	if (transfer->actual_length == 0)
		/* Nothing to send to the bus. */
		return;

	ctx->current_transfer += transfer->actual_length;
	sr_dbg("hantek-dso: got %d of %d in frame", ctx->current_transfer, ctx->framesize * 2);

	num_probes = (ctx->ch1_enabled && ctx->ch2_enabled) ? 2 : 1;
	packet.type = SR_DF_ANALOG;
	packet.payload = &analog;
	/* TODO: support for 5xxx series 9-bit samples */
	analog.num_samples = transfer->actual_length / 2;
	analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_probes);
	data_offset = 0;
	for (i = 0; i < analog.num_samples; i++) {
		/* The device always sends data for both channels. If a channel
		 * is disabled, it contains a copy of the enabled channel's
		 * data. However, we only send the requested channels to the bus.
		 */
		/* TODO: support for 5xxx series 9-bit samples */
		if (ctx->ch1_enabled) {
			ch1 = (*(transfer->buffer + i * 2 + 1) / 255.0);
			analog.data[data_offset++] = ch1;
		}
		if (ctx->ch2_enabled) {
			ch2 = (*(transfer->buffer + i * 2) / 255.0);
			analog.data[data_offset++] = ch2;
		}
	}
	g_free(transfer->buffer);
	libusb_free_transfer(transfer);
	sr_session_send(ctx->cb_data, &packet);

	if (ctx->current_transfer >= ctx->framesize * 2) {
		/* That's the last chunk in this frame. */
		packet.type = SR_DF_FRAME_END;
		sr_session_send(ctx->cb_data, &packet);

		if (ctx->limit_frames && ++ctx->num_frames == ctx->limit_frames) {
			/* Terminate session */
			/* TODO: don't leave pending USB transfers hanging */
			packet.type = SR_DF_END;
			sr_session_send(ctx->cb_data, &packet);
		} else {
			ctx->current_transfer = 0;
			ctx->dev_state = NEW_CAPTURE;
		}
	}

}

static int handle_event(int fd, int revents, void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct timeval tv;
	struct context *ctx;
	int capturestate;

	/* Avoid compiler warnings. */
	(void)fd;
	(void)revents;

	/* Always handle pending libusb events. */
	tv.tv_sec = tv.tv_usec = 0;
	libusb_handle_events_timeout(usb_context, &tv);

	ctx = cb_data;
	/* TODO: ugh */
	if (ctx->dev_state == NEW_CAPTURE) {
		if (dso_capture_start(ctx) != SR_OK)
			return TRUE;
		if (dso_enable_trigger(ctx) != SR_OK)
			return TRUE;
//		if (dso_force_trigger(ctx) != SR_OK)
//			return TRUE;
		sr_dbg("hantek-dso: successfully requested next chunk");
		ctx->dev_state = CAPTURE;
		return TRUE;
	}
	if (ctx->dev_state != CAPTURE)
		return TRUE;

	if ((capturestate = dso_get_capturestate(ctx)) == CAPTURE_UNKNOWN) {
		/* Generated by the function, not the hardware. */
		return TRUE;
	}

	sr_dbg("hantek-dso: capturestate %d", capturestate);
	switch (capturestate) {
	case CAPTURE_EMPTY:
		if (++ctx->capture_empty_count >= MAX_CAPTURE_EMPTY) {
			ctx->capture_empty_count = 0;
			if (dso_capture_start(ctx) != SR_OK)
				break;
			if (dso_enable_trigger(ctx) != SR_OK)
				break;
//			if (dso_force_trigger(ctx) != SR_OK)
//				break;
			sr_dbg("hantek-dso: successfully requested next chunk");
		}
		break;
	case CAPTURE_FILLING:
		/* no data yet */
		break;
	case CAPTURE_READY_8BIT:
		/* Tell the scope to send us the first frame. */
		if (dso_get_channeldata(ctx, receive_transfer) != SR_OK)
			break;

		/* Don't hit the state machine again until we're done fetching
		 * the data we just told the scope to send.
		 */
		ctx->dev_state = FETCH_DATA;

		/* Tell the frontend a new frame is on the way. */
		packet.type = SR_DF_FRAME_BEGIN;
		sr_session_send(cb_data, &packet);
		break;
	case CAPTURE_READY_9BIT:
		/* TODO */
		sr_err("not yet supported");
		break;
	case CAPTURE_TIMEOUT:
		/* Doesn't matter, we'll try again next time. */
		break;
	default:
		sr_dbg("unknown capture state");
	}

	return TRUE;
}

static int hw_start_acquisition(int device_index, void *cb_data)
{
	const struct libusb_pollfd **lupfd;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_header header;
	struct sr_datafeed_meta_analog meta;
	struct sr_dev_inst *sdi;
	struct context *ctx;
	int i;

	if (!(sdi = sr_dev_inst_get(dev_insts, device_index)))
		return SR_ERR;

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

	ctx = sdi->priv;
	ctx->cb_data = cb_data;

	if (dso_init(ctx) != SR_OK)
		return SR_ERR;

	if (dso_capture_start(ctx) != SR_OK)
		return SR_ERR;

	ctx->dev_state = CAPTURE;
	lupfd = libusb_get_pollfds(usb_context);
	for (i = 0; lupfd[i]; i++)
		sr_source_add(lupfd[i]->fd, lupfd[i]->events, TICK, handle_event,
			      ctx);
	free(lupfd);

	/* Send header packet to the session bus. */
	packet.type = SR_DF_HEADER;
	packet.payload = (unsigned char *)&header;
	header.feed_version = 1;
	gettimeofday(&header.starttime, NULL);
	sr_session_send(cb_data, &packet);

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

	return SR_OK;
}

/* TODO: doesn't really cancel pending transfers so they might come in after
 * SR_DF_END is sent.
 */
static int hw_stop_acquisition(int device_index, gpointer session_device_id)
{
	struct sr_datafeed_packet packet;
	struct sr_dev_inst *sdi;
	struct context *ctx;

	if (!(sdi = sr_dev_inst_get(dev_insts, device_index)))
		return SR_ERR;

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

	ctx = sdi->priv;
	ctx->dev_state = IDLE;

	packet.type = SR_DF_END;
	sr_session_send(session_device_id, &packet);

	return SR_OK;
}

SR_PRIV struct sr_dev_driver hantek_dso_plugin_info = {
	.name = "hantek-dso",
	.longname = "Hantek DSO",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.dev_info_get = hw_get_device_info,
	.dev_status_get = hw_get_status,
	.hwcap_get_all = hwcap_get_all,
	.dev_config_set = hw_dev_config_set,
	.dev_acquisition_start = hw_start_acquisition,
	.dev_acquisition_stop = hw_stop_acquisition,
};
Commit	Line	Data
3b533202 BV	1	/*
	2	* This file is part of the sigrok 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 <stdio.h>
	21	#include <stdint.h>
	22	#include <stdlib.h>
	23	#include <sys/types.h>
	24	#include <sys/stat.h>
	25	#include <fcntl.h>
	26	#include <unistd.h>
	27	#include <string.h>
	28	#include <sys/time.h>
	29	#include <inttypes.h>
	30	#include <arpa/inet.h>
	31	#include <glib.h>
	32	#include <libusb.h>
	33	#include "sigrok.h"
	34	#include "sigrok-internal.h"
	35	#include "config.h"
	36	#include "dso.h"
	37
	38
	39	/* Max time in ms before we want to check on events */
	40	#define TICK 1
	41
	42	static int capabilities[] = {
	43	SR_HWCAP_OSCILLOSCOPE,
ae88b97b	44	SR_HWCAP_LIMIT_SAMPLES,
3b533202	45	SR_HWCAP_CONTINUOUS,
a370ef19 BV	46	SR_HWCAP_TIMEBASE,
	47	SR_HWCAP_BUFFERSIZE,
	48	SR_HWCAP_TRIGGER_SOURCE,
	49	SR_HWCAP_TRIGGER_SLOPE,
	50	SR_HWCAP_HORIZ_TRIGGERPOS,
ebb781a6	51	SR_HWCAP_FILTER,
3b533202 BV	52	0,
	53	};
	54
	55	static const char *probe_names[] = {
	56	"CH1",
	57	"CH2",
	58	NULL,
	59	};
	60
	61	static struct dso_profile dev_profiles[] = {
	62	{ 0x04b4, 0x2090,
	63	0x04b5, 0x2090,
	64	"Hantek", "DSO-2090",
	65	NULL, 2,
	66	FIRMWARE_DIR "/hantek-dso-2090.fw" },
	67	{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }
	68	};
	69
a370ef19 BV	70	static uint64_t buffersizes[] = {
	71	10240,
	72	32768,
	73	/* TODO: 65535 */
	74	0
	75	};
	76
	77	static struct sr_rational timebases[] = {
	78	/* microseconds */
	79	{ 10, 1000000 },
	80	{ 20, 1000000 },
	81	{ 40, 1000000 },
	82	{ 100, 1000000 },
	83	{ 200, 1000000 },
	84	{ 400, 1000000 },
	85	/* milliseconds */
	86	{ 1, 1000 },
	87	{ 2, 1000 },
	88	{ 4, 1000 },
	89	{ 10, 1000 },
	90	{ 20, 1000 },
	91	{ 40, 1000 },
	92	{ 100, 1000 },
	93	{ 200, 1000 },
	94	{ 400, 1000 },
	95	{0,0}
	96	};
	97
	98	static char *trigger_sources[] = {
	99	"CH1",
	100	"CH2",
	101	"EXT",
	102	NULL
	103	};
3b533202	104
ebb781a6 BV	105	static char *filter_targets[] = {
	106	"CH1",
	107	"CH2",
	108	/* TODO: "TRIGGER", */
	109	NULL
	110	};
	111
3b533202 BV	112	SR_PRIV libusb_context *usb_context = NULL;
	113	SR_PRIV GSList *dev_insts = NULL;
	114
	115
	116	static struct sr_dev_inst dso_dev_new(int index, struct dso_profile prof)
	117	{
	118	struct sr_dev_inst *sdi;
	119	struct context *ctx;
	120
	121	sdi = sr_dev_inst_new(index, SR_ST_INITIALIZING,
	122	prof->vendor, prof->model, prof->model_version);
	123	if (!sdi)
	124	return NULL;
	125
	126	if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
	127	sr_err("hantek-dso: ctx malloc failed");
	128	return NULL;
	129	}
	130	ctx->profile = prof;
	131	ctx->dev_state = IDLE;
	132	ctx->timebase = DEFAULT_TIMEBASE;
	133	ctx->ch1_enabled = TRUE;
	134	ctx->ch2_enabled = TRUE;
	135	ctx->voltage_ch1 = DEFAULT_VOLTAGE;
	136	ctx->voltage_ch2 = DEFAULT_VOLTAGE;
	137	ctx->coupling_ch1 = DEFAULT_COUPLING;
	138	ctx->coupling_ch2 = DEFAULT_COUPLING;
	139	ctx->voffset_ch1 = DEFAULT_VERT_OFFSET;
	140	ctx->voffset_ch2 = DEFAULT_VERT_OFFSET;
	141	ctx->voffset_trigger = DEFAULT_VERT_TRIGGERPOS;
3b533202 BV	142	ctx->framesize = DEFAULT_FRAMESIZE;
3b533202 BV	143	ctx->triggerslope = SLOPE_POSITIVE;
a370ef19	144	ctx->triggersource = g_strdup(DEFAULT_TRIGGER_SOURCE);
3b533202 BV	145	ctx->triggerposition = DEFAULT_HORIZ_TRIGGERPOS;
	146	sdi->priv = ctx;
	147	dev_insts = g_slist_append(dev_insts, sdi);
	148
	149	return sdi;
	150	}
	151
	152	static int configure_probes(struct context ctx, GSList probes)
	153	{
	154	struct sr_probe *probe;
	155	GSList *l;
	156
6e71ef3b	157	ctx->ch1_enabled = ctx->ch2_enabled = FALSE;
3b533202 BV	158	for (l = probes; l; l = l->next) {
3b533202 BV	159	probe = (struct sr_probe *)l->data;
6e71ef3b	160	if (probe->index == 1)
3b533202	161	ctx->ch1_enabled = probe->enabled;
6e71ef3b	162	else if (probe->index == 2)
3b533202 BV	163	ctx->ch2_enabled = probe->enabled;
	164	}
	165
	166	return SR_OK;
	167	}
	168
	169	static int hw_init(const char *devinfo)
	170	{
	171	struct sr_dev_inst *sdi;
	172	struct libusb_device_descriptor des;
	173	struct dso_profile *prof;
	174	struct context *ctx;
	175	libusb_device **devlist;
	176	int err, devcnt, i, j;
	177
	178	/* Avoid compiler warnings. */
	179	(void)devinfo;
	180
	181	if (libusb_init(&usb_context) != 0) {
	182	sr_err("hantek-dso: Failed to initialize USB.");
	183	return 0;
	184	}
	185
	186	/* Find all Hantek DSO devices and upload firmware to all of them. */
	187	devcnt = 0;
	188	libusb_get_device_list(usb_context, &devlist);
	189	for (i = 0; devlist[i]; i++) {
	190	if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
	191	sr_err("hantek-dso: failed to get device descriptor: %d", err);
	192	continue;
	193	}
	194
	195	prof = NULL;
	196	for (j = 0; dev_profiles[j].orig_vid; j++) {
	197	if (des.idVendor == dev_profiles[j].orig_vid
	198	&& des.idProduct == dev_profiles[j].orig_pid) {
	199	/* Device matches the pre-firmware profile. */
	200	prof = &dev_profiles[j];
	201	sr_dbg("hantek-dso: Found a %s %s.", prof->vendor, prof->model);
	202	sdi = dso_dev_new(devcnt, prof);
	203	ctx = sdi->priv;
	204	if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
	205	prof->firmware) == SR_OK)
	206	/* Remember when the firmware on this device was updated */
	207	g_get_current_time(&ctx->fw_updated);
	208	else
	209	sr_err("hantek-dso: firmware upload failed for "
	210	"device %d", devcnt);
	211	/* Dummy USB address of 0xff will get overwritten later. */
	212	ctx->usb = sr_usb_dev_inst_new(
	213	libusb_get_bus_number(devlist[i]), 0xff, NULL);
	214	devcnt++;
	215	break;
	216	} else if (des.idVendor == dev_profiles[j].fw_vid
	217	&& des.idProduct == dev_profiles[j].fw_pid) {
	218	/* Device matches the post-firmware profile. */
	219	prof = &dev_profiles[j];
	220	sr_dbg("hantek-dso: Found a %s %s.", prof->vendor, prof->model);
	221	sdi = dso_dev_new(devcnt, prof);
	222	sdi->status = SR_ST_INACTIVE;
	223	ctx = sdi->priv;
	224	ctx->usb = sr_usb_dev_inst_new(
	225	libusb_get_bus_number(devlist[i]),
	226	libusb_get_device_address(devlist[i]), NULL);
227	devcnt++;
228	break;
229	}
230	}
231	if (!prof)
232	/* not a supported VID/PID */
233	continue;
234	}
235	libusb_free_device_list(devlist, 1);
236
237	return devcnt;
238	}
239
240	static int hw_dev_open(int dev_index)
241	{
242	GTimeVal cur_time;
243	struct sr_dev_inst *sdi;
244	struct context *ctx;
245	int timediff, err;
246
247	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
248	return SR_ERR_ARG;
249	ctx = sdi->priv;
250
251	/*
252	* if the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
253	* for the FX2 to renumerate
254	*/
255	err = 0;
256	if (GTV_TO_MSEC(ctx->fw_updated) > 0) {
257	sr_info("hantek-dso: waiting for device to reset");
258	/* takes at least 300ms for the FX2 to be gone from the USB bus */
259	g_usleep(300 * 1000);
260	timediff = 0;
261	while (timediff < MAX_RENUM_DELAY) {
262	if ((err = dso_open(dev_index)) == SR_OK)
263	break;
264	g_usleep(100 * 1000);
265	g_get_current_time(&cur_time);
266	timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(ctx->fw_updated);
267	}
268	sr_info("hantek-dso: device came back after %d ms", timediff);
269	} else {
270	err = dso_open(dev_index);
271	}
272
273	if (err != SR_OK) {
274	sr_err("hantek-dso: unable to open device");
275	return SR_ERR;
276	}
277
278	err = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
279	if (err != 0) {
280	sr_err("hantek-dso: Unable to claim interface: %d", err);
281	return SR_ERR;
282	}
283
284	return SR_OK;
285	}
286
287	static int hw_dev_close(int dev_index)
288	{
289	struct sr_dev_inst *sdi;
290
291	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
292	return SR_ERR_ARG;
293
294	dso_close(sdi);
295
296	return SR_OK;
297	}
298
299	static int hw_cleanup(void)
300	{
301	GSList *l;
302	struct sr_dev_inst *sdi;
303	struct context *ctx;
304
305	/* Properly close and free all devices. */
306	for (l = dev_insts; l; l = l->next) {
307	if (!(sdi = l->data)) {
308	/* Log error, but continue cleaning up the rest. */
309	sr_err("hantek-dso: %s: sdi was NULL, continuing", __func__);
310	continue;
311	}
312	if (!(ctx = sdi->priv)) {
313	/* Log error, but continue cleaning up the rest. */
314	sr_err("hantek-dso: %s: sdi->priv was NULL, continuing", __func__);
315	continue;
316	}
317	dso_close(sdi);
318	sr_usb_dev_inst_free(ctx->usb);
a370ef19 BV	319	g_free(ctx->triggersource);
a370ef19 BV	320
3b533202 BV	321	sr_dev_inst_free(sdi);
	322	}
	323
	324	g_slist_free(dev_insts);
	325	dev_insts = NULL;
	326
	327	if (usb_context)
	328	libusb_exit(usb_context);
	329	usb_context = NULL;
	330
	331	return SR_OK;
	332	}
	333
	334	static void *hw_get_device_info(int dev_index, int dev_info_id)
	335	{
	336	struct sr_dev_inst *sdi;
	337	struct context *ctx;
	338	void *info;
	339	uint64_t tmp;
	340
	341	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
	342	return NULL;
	343	ctx = sdi->priv;
	344
	345	info = NULL;
	346	switch (dev_info_id) {
	347	case SR_DI_INST:
	348	info = sdi;
	349	break;
	350	case SR_DI_NUM_PROBES:
	351	info = GINT_TO_POINTER(ctx->profile->num_probes);
	352	break;
	353	case SR_DI_PROBE_NAMES:
	354	info = probe_names;
	355	break;
a370ef19 BV	356	case SR_DI_BUFFERSIZES:
	357	info = buffersizes;
	358	break;
	359	case SR_DI_TIMEBASES:
	360	info = timebases;
	361	break;
	362	case SR_DI_TRIGGER_SOURCES:
	363	info = trigger_sources;
	364	break;
ebb781a6 BV	365	case SR_DI_FILTERS:
	366	info = filter_targets;
	367	break;
3b533202 BV	368	/* TODO remove this */
	369	case SR_DI_CUR_SAMPLERATE:
	370	info = &tmp;
	371	break;
	372	}
	373
	374	return info;
	375	}
	376
	377	static int hw_get_status(int device_index)
	378	{
	379	struct sr_dev_inst *sdi;
	380
	381	if (!(sdi = sr_dev_inst_get(dev_insts, device_index)))
	382	return SR_ST_NOT_FOUND;
	383
	384	return sdi->status;
	385	}
	386
	387	static int *hwcap_get_all(void)
	388	{
	389
	390	return capabilities;
	391	}
	392
	393	static int hw_dev_config_set(int dev_index, int hwcap, void *value)
	394	{
	395	struct sr_dev_inst *sdi;
	396	struct context *ctx;
a370ef19 BV	397	struct sr_rational tmp_rat;
	398	float tmp_float;
	399	uint64_t tmp_u64;
	400	int ret, i;
ebb781a6	401	char tmp_str, *targets;
3b533202 BV	402
	403	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
	404	return SR_ERR;
	405
	406	if (sdi->status != SR_ST_ACTIVE)
	407	return SR_ERR;
	408
a370ef19	409	ret = SR_OK;
3b533202 BV	410	ctx = sdi->priv;
3b533202 BV	411	switch (hwcap) {
ae88b97b BV	412	case SR_HWCAP_LIMIT_FRAMES:
	413	ctx->limit_frames = (uint64_t )value;
	414	break;
3b533202 BV	415	case SR_HWCAP_PROBECONFIG:
	416	ret = configure_probes(ctx, (GSList *) value);
	417	break;
a370ef19 BV	418	case SR_HWCAP_TRIGGER_SLOPE:
	419	tmp_u64 = (int )value;
	420	if (tmp_u64 != SLOPE_NEGATIVE && tmp_u64 != SLOPE_POSITIVE)
	421	ret = SR_ERR_ARG;
	422	ctx->triggerslope = tmp_u64;
	423	break;
	424	case SR_HWCAP_HORIZ_TRIGGERPOS:
	425	tmp_float = (float )value;
	426	if (tmp_float < 0.0 \|\| tmp_float > 1.0) {
	427	sr_err("hantek-dso: trigger position should be between 0.0 and 1.0");
3b533202	428	ret = SR_ERR_ARG;
a370ef19 BV	429	} else
	430	ctx->triggerposition = tmp_float;
	431	break;
	432	case SR_HWCAP_BUFFERSIZE:
	433	tmp_u64 = (int )value;
	434	for (i = 0; buffersizes[i]; i++) {
	435	if (buffersizes[i] == tmp_u64) {
	436	ctx->framesize = tmp_u64;
	437	break;
	438	}
	439	}
	440	if (buffersizes[i] == 0)
	441	ret = SR_ERR_ARG;
	442	break;
	443	case SR_HWCAP_TIMEBASE:
	444	tmp_rat = (struct sr_rational )value;
	445	for (i = 0; timebases[i].p && timebases[i].q; i++) {
	446	if (timebases[i].p == tmp_rat.p
	447	&& timebases[i].q == tmp_rat.q) {
	448	ctx->timebase = i;
	449	break;
	450	}
	451	}
	452	if (timebases[i].p == 0 && timebases[i].q == 0)
	453	ret = SR_ERR_ARG;
	454	break;
	455	case SR_HWCAP_TRIGGER_SOURCE:
	456	tmp_str = value;
	457	for (i = 0; trigger_sources[i]; i++) {
	458	if (!strcmp(tmp_str, trigger_sources[i])) {
	459	ctx->triggersource = g_strdup(tmp_str);
	460	break;
	461	}
	462	}
	463	if (trigger_sources[i] == 0)
	464	ret = SR_ERR_ARG;
	465	break;
ebb781a6 BV	466	case SR_HWCAP_FILTER:
	467	ctx->filter_ch1 = ctx->filter_ch2 = ctx->filter_trigger = 0;
	468	targets = g_strsplit(value, ",", 0);
	469	for (i = 0; targets[i]; i++) {
	470	if (targets[i] == '\0')
	471	/* Empty filter string can be used to clear them all. */
	472	;
	473	else if (!strcmp(targets[i], "CH1"))
	474	ctx->filter_ch1 = TRUE;
	475	else if (!strcmp(targets[i], "CH2"))
	476	ctx->filter_ch2 = TRUE;
	477	else if (!strcmp(targets[i], "TRIGGER"))
	478	ctx->filter_trigger = TRUE;
	479	else {
	480	sr_err("invalid filter target %s", targets[i]);
	481	ret = SR_ERR_ARG;
	482	}
	483	}
	484	g_strfreev(targets);
	485	break;
3b533202 BV	486	default:
	487	ret = SR_ERR_ARG;
	488	}
	489
	490	return ret;
	491	}
	492
	493	/* Called by libusb (as triggered by handle_event()) when a transfer comes in.
	494	* Only channel data comes in asynchronously, and all transfers for this are
	495	* queued up beforehand, so this just needs so chuck the incoming data onto
	496	* the libsigrok session bus.
	497	*/
	498	static void receive_transfer(struct libusb_transfer *transfer)
	499	{
	500	struct sr_datafeed_packet packet;
	501	struct sr_datafeed_analog analog;
	502	struct context *ctx;
	503	float ch1, ch2;
6e71ef3b	504	int num_probes, data_offset, i;
3b533202 BV	505
	506	ctx = transfer->user_data;
	507	sr_dbg("hantek-dso: receive_transfer(): status %d received %d bytes",
	508	transfer->status, transfer->actual_length);
	509
	510	if (transfer->actual_length == 0)
	511	/* Nothing to send to the bus. */
	512	return;
	513
	514	ctx->current_transfer += transfer->actual_length;
	515	sr_dbg("hantek-dso: got %d of %d in frame", ctx->current_transfer, ctx->framesize * 2);
3b533202	516
6e71ef3b	517	num_probes = (ctx->ch1_enabled && ctx->ch2_enabled) ? 2 : 1;
3b533202 BV	518	packet.type = SR_DF_ANALOG;
3b533202 BV	519	packet.payload = &analog;
6e71ef3b	520	/* TODO: support for 5xxx series 9-bit samples */
3b533202	521	analog.num_samples = transfer->actual_length / 2;
6e71ef3b BV	522	analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_probes);
6e71ef3b BV	523	data_offset = 0;
3b533202	524	for (i = 0; i < analog.num_samples; i++) {
6e71ef3b BV	525	/* The device always sends data for both channels. If a channel
	526	* is disabled, it contains a copy of the enabled channel's
	527	* data. However, we only send the requested channels to the bus.
	528	*/
3b533202	529	/* TODO: support for 5xxx series 9-bit samples */
6e71ef3b BV	530	if (ctx->ch1_enabled) {
	531	ch1 = ((transfer->buffer + i 2 + 1) / 255.0);
	532	analog.data[data_offset++] = ch1;
	533	}
	534	if (ctx->ch2_enabled) {
	535	ch2 = ((transfer->buffer + i 2) / 255.0);
	536	analog.data[data_offset++] = ch2;
	537	}
3b533202 BV	538	}
	539	g_free(transfer->buffer);
	540	libusb_free_transfer(transfer);
3b533202 BV	541	sr_session_send(ctx->cb_data, &packet);
3b533202 BV	542
ae88b97b BV	543	if (ctx->current_transfer >= ctx->framesize * 2) {
	544	/* That's the last chunk in this frame. */
	545	packet.type = SR_DF_FRAME_END;
	546	sr_session_send(ctx->cb_data, &packet);
	547
	548	if (ctx->limit_frames && ++ctx->num_frames == ctx->limit_frames) {
	549	/* Terminate session */
6e71ef3b	550	/* TODO: don't leave pending USB transfers hanging */
ae88b97b BV	551	packet.type = SR_DF_END;
	552	sr_session_send(ctx->cb_data, &packet);
	553	} else {
	554	ctx->current_transfer = 0;
	555	ctx->dev_state = NEW_CAPTURE;
	556	}
	557	}
	558
3b533202 BV	559	}
	560
	561	static int handle_event(int fd, int revents, void *cb_data)
	562	{
ae88b97b	563	struct sr_datafeed_packet packet;
3b533202 BV	564	struct timeval tv;
	565	struct context *ctx;
	566	int capturestate;
	567
	568	/* Avoid compiler warnings. */
	569	(void)fd;
	570	(void)revents;
	571
	572	/* Always handle pending libusb events. */
	573	tv.tv_sec = tv.tv_usec = 0;
	574	libusb_handle_events_timeout(usb_context, &tv);
	575
	576	ctx = cb_data;
	577	/* TODO: ugh */
	578	if (ctx->dev_state == NEW_CAPTURE) {
	579	if (dso_capture_start(ctx) != SR_OK)
	580	return TRUE;
	581	if (dso_enable_trigger(ctx) != SR_OK)
	582	return TRUE;
a370ef19 BV	583	// if (dso_force_trigger(ctx) != SR_OK)
a370ef19 BV	584	// return TRUE;
3b533202 BV	585	sr_dbg("hantek-dso: successfully requested next chunk");
	586	ctx->dev_state = CAPTURE;
	587	return TRUE;
	588	}
	589	if (ctx->dev_state != CAPTURE)
	590	return TRUE;
	591
	592	if ((capturestate = dso_get_capturestate(ctx)) == CAPTURE_UNKNOWN) {
	593	/* Generated by the function, not the hardware. */
	594	return TRUE;
	595	}
	596
	597	sr_dbg("hantek-dso: capturestate %d", capturestate);
	598	switch (capturestate) {
	599	case CAPTURE_EMPTY:
	600	if (++ctx->capture_empty_count >= MAX_CAPTURE_EMPTY) {
	601	ctx->capture_empty_count = 0;
	602	if (dso_capture_start(ctx) != SR_OK)
	603	break;
	604	if (dso_enable_trigger(ctx) != SR_OK)
	605	break;
a370ef19 BV	606	// if (dso_force_trigger(ctx) != SR_OK)
a370ef19 BV	607	// break;
3b533202 BV	608	sr_dbg("hantek-dso: successfully requested next chunk");
	609	}
	610	break;
	611	case CAPTURE_FILLING:
	612	/* no data yet */
	613	break;
	614	case CAPTURE_READY_8BIT:
	615	/* Tell the scope to send us the first frame. */
	616	if (dso_get_channeldata(ctx, receive_transfer) != SR_OK)
	617	break;
ae88b97b BV	618
	619	/* Don't hit the state machine again until we're done fetching
	620	* the data we just told the scope to send.
	621	*/
3b533202	622	ctx->dev_state = FETCH_DATA;
ae88b97b BV	623
	624	/* Tell the frontend a new frame is on the way. */
	625	packet.type = SR_DF_FRAME_BEGIN;
	626	sr_session_send(cb_data, &packet);
3b533202 BV	627	break;
	628	case CAPTURE_READY_9BIT:
	629	/* TODO */
	630	sr_err("not yet supported");
	631	break;
	632	case CAPTURE_TIMEOUT:
	633	/* Doesn't matter, we'll try again next time. */
	634	break;
	635	default:
	636	sr_dbg("unknown capture state");
	637	}
	638
	639	return TRUE;
	640	}
	641
	642	static int hw_start_acquisition(int device_index, void *cb_data)
	643	{
	644	const struct libusb_pollfd **lupfd;
	645	struct sr_datafeed_packet packet;
	646	struct sr_datafeed_header header;
	647	struct sr_datafeed_meta_analog meta;
	648	struct sr_dev_inst *sdi;
	649	struct context *ctx;
	650	int i;
	651
	652	if (!(sdi = sr_dev_inst_get(dev_insts, device_index)))
	653	return SR_ERR;
	654
	655	if (sdi->status != SR_ST_ACTIVE)
	656	return SR_ERR;
	657
	658	ctx = sdi->priv;
	659	ctx->cb_data = cb_data;
	660
	661	if (dso_init(ctx) != SR_OK)
	662	return SR_ERR;
	663
	664	if (dso_capture_start(ctx) != SR_OK)
	665	return SR_ERR;
	666
	667	ctx->dev_state = CAPTURE;
	668	lupfd = libusb_get_pollfds(usb_context);
	669	for (i = 0; lupfd[i]; i++)
	670	sr_source_add(lupfd[i]->fd, lupfd[i]->events, TICK, handle_event,
	671	ctx);
	672	free(lupfd);
	673
	674	/* Send header packet to the session bus. */
	675	packet.type = SR_DF_HEADER;
	676	packet.payload = (unsigned char *)&header;
	677	header.feed_version = 1;
	678	gettimeofday(&header.starttime, NULL);
	679	sr_session_send(cb_data, &packet);
	680
	681	/* Send metadata about the SR_DF_ANALOG packets to come. */
	682	packet.type = SR_DF_META_ANALOG;
	683	packet.payload = &meta;
	684	meta.num_probes = ctx->profile->num_probes;
	685	sr_session_send(cb_data, &packet);
	686
	687	return SR_OK;
	688	}
	689
	690	/* TODO: doesn't really cancel pending transfers so they might come in after
691	* SR_DF_END is sent.
692	*/
693	static int hw_stop_acquisition(int device_index, gpointer session_device_id)
694	{
695	struct sr_datafeed_packet packet;
696	struct sr_dev_inst *sdi;
697	struct context *ctx;
698
699	if (!(sdi = sr_dev_inst_get(dev_insts, device_index)))
700	return SR_ERR;
701
702	if (sdi->status != SR_ST_ACTIVE)
703	return SR_ERR;
704
705	ctx = sdi->priv;
706	ctx->dev_state = IDLE;
707
708	packet.type = SR_DF_END;
709	sr_session_send(session_device_id, &packet);
710
711	return SR_OK;
712	}
713
714	SR_PRIV struct sr_dev_driver hantek_dso_plugin_info = {
715	.name = "hantek-dso",
716	.longname = "Hantek DSO",
717	.api_version = 1,
718	.init = hw_init,
719	.cleanup = hw_cleanup,
720	.dev_open = hw_dev_open,
721	.dev_close = hw_dev_close,
722	.dev_info_get = hw_get_device_info,
723	.dev_status_get = hw_get_status,
724	.hwcap_get_all = hwcap_get_all,
725	.dev_config_set = hw_dev_config_set,
726	.dev_acquisition_start = hw_start_acquisition,
727	.dev_acquisition_stop = hw_stop_acquisition,
728	};