[libsigrok.git] / hardware / victor-dmm / api.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <glib.h>
#include <libusb.h>
#include <stdlib.h>
#include <string.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"

#define VICTOR_VID 0x1244
#define VICTOR_PID 0xd237
#define VICTOR_VENDOR "Victor"
#define VICTOR_INTERFACE 0
#define VICTOR_ENDPOINT LIBUSB_ENDPOINT_IN | 1

SR_PRIV struct sr_dev_driver victor_dmm_driver_info;
static struct sr_dev_driver *di = &victor_dmm_driver_info;
static int dev_close(struct sr_dev_inst *sdi);
static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);

static const int32_t hwopts[] = {
	SR_CONF_CONN,
};

static const int32_t hwcaps[] = {
	SR_CONF_MULTIMETER,
	SR_CONF_LIMIT_MSEC,
	SR_CONF_LIMIT_SAMPLES,
	SR_CONF_CONTINUOUS,
};

/* Properly close and free all devices. */
static int clear_instances(void)
{
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	struct dev_context *devc;
	GSList *l;

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

	for (l = drvc->instances; l; l = l->next) {
		if (!(sdi = l->data))
			continue;
		if (!(devc = sdi->priv))
			continue;
		dev_close(sdi);
		sr_usb_dev_inst_free(sdi->conn);
		sr_dev_inst_free(sdi);
	}

	g_slist_free(drvc->instances);
	drvc->instances = NULL;

	return SR_OK;
}

static int init(struct sr_context *sr_ctx)
{
	return std_hw_init(sr_ctx, di, LOG_PREFIX);
}

static GSList *scan(GSList *options)
{
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	struct sr_probe *probe;
	struct libusb_device_descriptor des;
	libusb_device **devlist;
	GSList *devices;
	int ret, devcnt, i;

	(void)options;

	drvc = di->priv;

	devices = NULL;
	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	for (i = 0; devlist[i]; i++) {
		if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
			sr_warn("Failed to get device descriptor: %s",
					libusb_error_name(ret));
			continue;
		}

		if (des.idVendor != VICTOR_VID || des.idProduct != VICTOR_PID)
			continue;

		devcnt = g_slist_length(drvc->instances);
		if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
				VICTOR_VENDOR, NULL, NULL)))
			return NULL;
		sdi->driver = di;

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

		if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
			return NULL;
		sdi->probes = g_slist_append(NULL, probe);

		if (!(sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
				libusb_get_device_address(devlist[i]), NULL)))
			return NULL;
		sdi->inst_type = SR_INST_USB;

		drvc->instances = g_slist_append(drvc->instances, sdi);
		devices = g_slist_append(devices, sdi);
	}
	libusb_free_device_list(devlist, 1);

	return devices;
}

static GSList *dev_list(void)
{
	return ((struct drv_context *)(di->priv))->instances;
}

static int dev_open(struct sr_dev_inst *sdi)
{
	struct drv_context *drvc = di->priv;
	struct sr_usb_dev_inst *usb;
	libusb_device **devlist;
	int ret, i;

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

	usb = sdi->conn;

	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	for (i = 0; devlist[i]; i++) {
		if (libusb_get_bus_number(devlist[i]) != usb->bus
				|| libusb_get_device_address(devlist[i]) != usb->address)
			continue;
		if ((ret = libusb_open(devlist[i], &usb->devhdl))) {
			sr_err("Failed to open device: %s.", libusb_error_name(ret));
			return SR_ERR;
		}
		break;
	}
	libusb_free_device_list(devlist, 1);
	if (!devlist[i]) {
		sr_err("Device not found.");
		return SR_ERR;
	}

	/* The device reports as HID class, so the kernel would have
	 * claimed it. */
	if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
		if ((ret = libusb_detach_kernel_driver(usb->devhdl, 0)) < 0) {
			sr_err("Failed to detach kernel driver: %s.",
			       libusb_error_name(ret));
			return SR_ERR;
		}
	}

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

	return SR_OK;
}

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

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

	usb = sdi->conn;

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

	libusb_release_interface(usb->devhdl, VICTOR_INTERFACE);
	libusb_close(usb->devhdl);
	usb->devhdl = NULL;
	sdi->status = SR_ST_INACTIVE;

	return SR_OK;
}

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

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

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

	return SR_OK;
}

static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
{
	struct sr_usb_dev_inst *usb;
	char str[128];

	switch (id) {
	case SR_CONF_CONN:
		if (!sdi || !sdi->conn)
			return SR_ERR_ARG;
		usb = sdi->conn;
		snprintf(str, 128, "%d.%d", usb->bus, usb->address);
		*data = g_variant_new_string(str);
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	gint64 now;
	int ret;

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

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

	devc = sdi->priv;
	ret = SR_OK;
	switch (id) {
	case SR_CONF_LIMIT_MSEC:
		devc->limit_msec = g_variant_get_uint64(data);
		now = g_get_monotonic_time() / 1000;
		devc->end_time = now + devc->limit_msec;
		sr_dbg("Setting time limit to %" PRIu64 "ms.",
		       devc->limit_msec);
		break;
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		sr_dbg("Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	default:
		ret = SR_ERR_NA;
	}

	return ret;
}

static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
{

	(void)sdi;

	switch (key) {
	case SR_CONF_SCAN_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
		break;
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static void receive_transfer(struct libusb_transfer *transfer)
{
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	int ret;

	sdi = transfer->user_data;
	devc = sdi->priv;
	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
		/* USB device was unplugged. */
		dev_acquisition_stop(sdi, sdi);
	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
		sr_dbg("Got %d-byte packet.", transfer->actual_length);
		if (transfer->actual_length == DMM_DATA_SIZE) {
			victor_dmm_receive_data(sdi, transfer->buffer);
			if (devc->limit_samples) {
				if (devc->num_samples >= devc->limit_samples)
					dev_acquisition_stop(sdi, sdi);
			}
		}
	}
	/* Anything else is either an error or a timeout, which is fine:
	 * we were just going to send another transfer request anyway. */

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

static int handle_events(int fd, int revents, void *cb_data)
{
	struct dev_context *devc;
	struct drv_context *drvc = di->priv;
	struct sr_datafeed_packet packet;
	struct sr_dev_inst *sdi;
	struct timeval tv;
	gint64 now;
	int i;

	(void)fd;
	(void)revents;

	sdi = cb_data;
	devc = sdi->priv;

	if (devc->limit_msec) {
		now = g_get_monotonic_time() / 1000;
		if (now > devc->end_time)
			dev_acquisition_stop(sdi, sdi);
	}

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

		dev_close(sdi);

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

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

	return TRUE;
}

static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
{
	struct dev_context *devc;
	struct drv_context *drvc = di->priv;
	const struct libusb_pollfd **pfd;
	struct sr_usb_dev_inst *usb;
	struct libusb_transfer *transfer;
	int ret, i;
	unsigned char *buf;

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

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

	devc = sdi->priv;
	usb = sdi->conn;
	devc->cb_data = cb_data;

	/* Send header packet to the session bus. */
	std_session_send_df_header(cb_data, LOG_PREFIX);

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

	buf = g_try_malloc(DMM_DATA_SIZE);
	transfer = libusb_alloc_transfer(0);
	/* Each transfer request gets 100ms to arrive before it's restarted.
	 * The device only sends 1 transfer/second no matter how many
	 * times you ask, but we want to keep step with the USB events
	 * handling above. */
	libusb_fill_interrupt_transfer(transfer, usb->devhdl,
			VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
			cb_data, 100);
	if ((ret = libusb_submit_transfer(transfer) != 0)) {
		sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
		libusb_free_transfer(transfer);
		g_free(buf);
		return SR_ERR;
	}

	return SR_OK;
}

static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
	(void)cb_data;

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

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

	sdi->status = SR_ST_STOPPING;

	return SR_OK;
}

SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	.name = "victor-dmm",
	.longname = "Victor DMMs",
	.api_version = 1,
	.init = init,
	.cleanup = cleanup,
	.scan = scan,
	.dev_list = dev_list,
	.dev_clear = clear_instances,
	.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,
	.priv = NULL,
};
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
	5	*
	6	* This program is free software: you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation, either version 3 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <glib.h>
	21	#include <libusb.h>
	22	#include <stdlib.h>
	23	#include <string.h>
	24	#include "libsigrok.h"
	25	#include "libsigrok-internal.h"
	26	#include "protocol.h"
	27
	28	#define VICTOR_VID 0x1244
	29	#define VICTOR_PID 0xd237
	30	#define VICTOR_VENDOR "Victor"
	31	#define VICTOR_INTERFACE 0
	32	#define VICTOR_ENDPOINT LIBUSB_ENDPOINT_IN \| 1
	33
	34	SR_PRIV struct sr_dev_driver victor_dmm_driver_info;
	35	static struct sr_dev_driver *di = &victor_dmm_driver_info;
	36	static int dev_close(struct sr_dev_inst *sdi);
	37	static int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data);
	38
	39	static const int32_t hwopts[] = {
	40	SR_CONF_CONN,
	41	};
	42
	43	static const int32_t hwcaps[] = {
	44	SR_CONF_MULTIMETER,
	45	SR_CONF_LIMIT_MSEC,
	46	SR_CONF_LIMIT_SAMPLES,
	47	SR_CONF_CONTINUOUS,
	48	};
	49
	50	/* Properly close and free all devices. */
	51	static int clear_instances(void)
	52	{
	53	struct sr_dev_inst *sdi;
	54	struct drv_context *drvc;
	55	struct dev_context *devc;
	56	GSList *l;
	57
	58	if (!(drvc = di->priv))
	59	/* Can get called on an unused driver, doesn't matter. */
	60	return SR_OK;
	61
	62	for (l = drvc->instances; l; l = l->next) {
	63	if (!(sdi = l->data))
	64	continue;
	65	if (!(devc = sdi->priv))
	66	continue;
	67	dev_close(sdi);
	68	sr_usb_dev_inst_free(sdi->conn);
	69	sr_dev_inst_free(sdi);
	70	}
	71
	72	g_slist_free(drvc->instances);
	73	drvc->instances = NULL;
	74
	75	return SR_OK;
	76	}
	77
	78	static int init(struct sr_context *sr_ctx)
	79	{
	80	return std_hw_init(sr_ctx, di, LOG_PREFIX);
	81	}
	82
	83	static GSList scan(GSList options)
	84	{
	85	struct drv_context *drvc;
	86	struct dev_context *devc;
	87	struct sr_dev_inst *sdi;
	88	struct sr_probe *probe;
	89	struct libusb_device_descriptor des;
	90	libusb_device **devlist;
	91	GSList *devices;
	92	int ret, devcnt, i;
	93
	94	(void)options;
	95
	96	drvc = di->priv;
	97
	98	devices = NULL;
	99	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	100	for (i = 0; devlist[i]; i++) {
	101	if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
	102	sr_warn("Failed to get device descriptor: %s",
	103	libusb_error_name(ret));
	104	continue;
	105	}
	106
	107	if (des.idVendor != VICTOR_VID \|\| des.idProduct != VICTOR_PID)
	108	continue;
	109
	110	devcnt = g_slist_length(drvc->instances);
	111	if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
	112	VICTOR_VENDOR, NULL, NULL)))
	113	return NULL;
	114	sdi->driver = di;
	115
	116	if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
	117	return NULL;
	118	sdi->priv = devc;
	119
	120	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	121	return NULL;
	122	sdi->probes = g_slist_append(NULL, probe);
	123
	124	if (!(sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
	125	libusb_get_device_address(devlist[i]), NULL)))
	126	return NULL;
	127	sdi->inst_type = SR_INST_USB;
	128
	129	drvc->instances = g_slist_append(drvc->instances, sdi);
	130	devices = g_slist_append(devices, sdi);
	131	}
	132	libusb_free_device_list(devlist, 1);
	133
	134	return devices;
	135	}
	136
	137	static GSList *dev_list(void)
	138	{
	139	return ((struct drv_context *)(di->priv))->instances;
	140	}
	141
	142	static int dev_open(struct sr_dev_inst *sdi)
	143	{
	144	struct drv_context *drvc = di->priv;
	145	struct sr_usb_dev_inst *usb;
	146	libusb_device **devlist;
	147	int ret, i;
	148
	149	if (!di->priv) {
	150	sr_err("Driver was not initialized.");
	151	return SR_ERR;
	152	}
	153
	154	usb = sdi->conn;
	155
	156	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	157	for (i = 0; devlist[i]; i++) {
	158	if (libusb_get_bus_number(devlist[i]) != usb->bus
	159	\|\| libusb_get_device_address(devlist[i]) != usb->address)
	160	continue;
	161	if ((ret = libusb_open(devlist[i], &usb->devhdl))) {
	162	sr_err("Failed to open device: %s.", libusb_error_name(ret));
	163	return SR_ERR;
	164	}
	165	break;
	166	}
	167	libusb_free_device_list(devlist, 1);
	168	if (!devlist[i]) {
	169	sr_err("Device not found.");
	170	return SR_ERR;
	171	}
	172
	173	/* The device reports as HID class, so the kernel would have
	174	* claimed it. */
	175	if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
	176	if ((ret = libusb_detach_kernel_driver(usb->devhdl, 0)) < 0) {
	177	sr_err("Failed to detach kernel driver: %s.",
	178	libusb_error_name(ret));
	179	return SR_ERR;
	180	}
	181	}
	182
	183	if ((ret = libusb_claim_interface(usb->devhdl,
	184	VICTOR_INTERFACE))) {
	185	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	186	return SR_ERR;
	187	}
	188	sdi->status = SR_ST_ACTIVE;
	189
	190	return SR_OK;
	191	}
	192
	193	static int dev_close(struct sr_dev_inst *sdi)
	194	{
	195	struct sr_usb_dev_inst *usb;
	196
	197	if (!di->priv) {
	198	sr_err("Driver was not initialized.");
	199	return SR_ERR;
	200	}
	201
	202	usb = sdi->conn;
	203
	204	if (!usb->devhdl)
	205	/* Nothing to do. */
	206	return SR_OK;
	207
	208	libusb_release_interface(usb->devhdl, VICTOR_INTERFACE);
	209	libusb_close(usb->devhdl);
	210	usb->devhdl = NULL;
	211	sdi->status = SR_ST_INACTIVE;
	212
	213	return SR_OK;
	214	}
	215
	216	static int cleanup(void)
	217	{
	218	struct drv_context *drvc;
	219
	220	if (!(drvc = di->priv))
	221	/* Can get called on an unused driver, doesn't matter. */
	222	return SR_OK;
	223
	224	clear_instances();
	225	g_free(drvc);
	226	di->priv = NULL;
	227
	228	return SR_OK;
	229	}
	230
	231	static int config_get(int id, GVariant *data, const struct sr_dev_inst sdi)
	232	{
	233	struct sr_usb_dev_inst *usb;
	234	char str[128];
	235
	236	switch (id) {
	237	case SR_CONF_CONN:
	238	if (!sdi \|\| !sdi->conn)
	239	return SR_ERR_ARG;
	240	usb = sdi->conn;
	241	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	242	*data = g_variant_new_string(str);
	243	break;
	244	default:
	245	return SR_ERR_NA;
	246	}
	247
	248	return SR_OK;
	249	}
	250
	251	static int config_set(int id, GVariant data, const struct sr_dev_inst sdi)
	252	{
	253	struct dev_context *devc;
	254	gint64 now;
	255	int ret;
	256
	257	if (sdi->status != SR_ST_ACTIVE)
	258	return SR_ERR_DEV_CLOSED;
	259
	260	if (!di->priv) {
	261	sr_err("Driver was not initialized.");
	262	return SR_ERR;
	263	}
	264
	265	devc = sdi->priv;
	266	ret = SR_OK;
	267	switch (id) {
	268	case SR_CONF_LIMIT_MSEC:
	269	devc->limit_msec = g_variant_get_uint64(data);
	270	now = g_get_monotonic_time() / 1000;
	271	devc->end_time = now + devc->limit_msec;
	272	sr_dbg("Setting time limit to %" PRIu64 "ms.",
	273	devc->limit_msec);
	274	break;
	275	case SR_CONF_LIMIT_SAMPLES:
	276	devc->limit_samples = g_variant_get_uint64(data);
	277	sr_dbg("Setting sample limit to %" PRIu64 ".",
	278	devc->limit_samples);
	279	break;
	280	default:
	281	ret = SR_ERR_NA;
	282	}
	283
	284	return ret;
	285	}
	286
	287	static int config_list(int key, GVariant *data, const struct sr_dev_inst sdi)
	288	{
	289
	290	(void)sdi;
	291
	292	switch (key) {
	293	case SR_CONF_SCAN_OPTIONS:
	294	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	295	hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
	296	break;
	297	case SR_CONF_DEVICE_OPTIONS:
	298	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	299	hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
	300	break;
	301	default:
	302	return SR_ERR_NA;
	303	}
	304
	305	return SR_OK;
	306	}
	307
	308	static void receive_transfer(struct libusb_transfer *transfer)
	309	{
	310	struct dev_context *devc;
	311	struct sr_dev_inst *sdi;
	312	int ret;
	313
	314	sdi = transfer->user_data;
	315	devc = sdi->priv;
	316	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	317	/* USB device was unplugged. */
	318	dev_acquisition_stop(sdi, sdi);
	319	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
	320	sr_dbg("Got %d-byte packet.", transfer->actual_length);
	321	if (transfer->actual_length == DMM_DATA_SIZE) {
	322	victor_dmm_receive_data(sdi, transfer->buffer);
	323	if (devc->limit_samples) {
	324	if (devc->num_samples >= devc->limit_samples)
	325	dev_acquisition_stop(sdi, sdi);
	326	}
	327	}
	328	}
	329	/* Anything else is either an error or a timeout, which is fine:
	330	* we were just going to send another transfer request anyway. */
	331
	332	if (sdi->status == SR_ST_ACTIVE) {
	333	/* Send the same request again. */
	334	if ((ret = libusb_submit_transfer(transfer) != 0)) {
	335	sr_err("Unable to resubmit transfer: %s.",
	336	libusb_error_name(ret));
	337	g_free(transfer->buffer);
	338	libusb_free_transfer(transfer);
	339	dev_acquisition_stop(sdi, sdi);
	340	}
	341	} else {
	342	/* This was the last transfer we're going to receive, so
	343	* clean up now. */
	344	g_free(transfer->buffer);
	345	libusb_free_transfer(transfer);
	346	}
	347	}
	348
	349	static int handle_events(int fd, int revents, void *cb_data)
	350	{
	351	struct dev_context *devc;
	352	struct drv_context *drvc = di->priv;
	353	struct sr_datafeed_packet packet;
	354	struct sr_dev_inst *sdi;
	355	struct timeval tv;
	356	gint64 now;
	357	int i;
	358
	359	(void)fd;
	360	(void)revents;
	361
	362	sdi = cb_data;
	363	devc = sdi->priv;
	364
	365	if (devc->limit_msec) {
	366	now = g_get_monotonic_time() / 1000;
	367	if (now > devc->end_time)
	368	dev_acquisition_stop(sdi, sdi);
	369	}
	370
	371	if (sdi->status == SR_ST_STOPPING) {
	372	for (i = 0; devc->usbfd[i] != -1; i++)
	373	sr_source_remove(devc->usbfd[i]);
	374
	375	dev_close(sdi);
	376
	377	packet.type = SR_DF_END;
	378	sr_session_send(cb_data, &packet);
	379	}
	380
	381	memset(&tv, 0, sizeof(struct timeval));
	382	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
	383	NULL);
	384
	385	return TRUE;
	386	}
	387
	388	static int dev_acquisition_start(const struct sr_dev_inst sdi, void cb_data)
	389	{
	390	struct dev_context *devc;
	391	struct drv_context *drvc = di->priv;
	392	const struct libusb_pollfd **pfd;
	393	struct sr_usb_dev_inst *usb;
	394	struct libusb_transfer *transfer;
	395	int ret, i;
	396	unsigned char *buf;
	397
	398	if (sdi->status != SR_ST_ACTIVE)
	399	return SR_ERR_DEV_CLOSED;
	400
	401	if (!di->priv) {
	402	sr_err("Driver was not initialized.");
	403	return SR_ERR;
	404	}
	405
	406	devc = sdi->priv;
	407	usb = sdi->conn;
	408	devc->cb_data = cb_data;
	409
	410	/* Send header packet to the session bus. */
	411	std_session_send_df_header(cb_data, LOG_PREFIX);
	412
	413	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
	414	for (i = 0; pfd[i]; i++) {
	415	/* Handle USB events every 100ms, for decent latency. */
	416	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	417	handle_events, (void *)sdi);
	418	/* We'll need to remove this fd later. */
	419	devc->usbfd[i] = pfd[i]->fd;
	420	}
	421	devc->usbfd[i] = -1;
	422
	423	buf = g_try_malloc(DMM_DATA_SIZE);
	424	transfer = libusb_alloc_transfer(0);
	425	/* Each transfer request gets 100ms to arrive before it's restarted.
	426	* The device only sends 1 transfer/second no matter how many
	427	* times you ask, but we want to keep step with the USB events
	428	* handling above. */
	429	libusb_fill_interrupt_transfer(transfer, usb->devhdl,
	430	VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
	431	cb_data, 100);
	432	if ((ret = libusb_submit_transfer(transfer) != 0)) {
	433	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	434	libusb_free_transfer(transfer);
	435	g_free(buf);
	436	return SR_ERR;
	437	}
	438
	439	return SR_OK;
	440	}
	441
	442	static int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	443	{
	444	(void)cb_data;
	445
	446	if (!di->priv) {
	447	sr_err("Driver was not initialized.");
	448	return SR_ERR;
	449	}
	450
	451	if (sdi->status != SR_ST_ACTIVE) {
	452	sr_err("Device not active, can't stop acquisition.");
	453	return SR_ERR;
	454	}
	455
	456	sdi->status = SR_ST_STOPPING;
	457
	458	return SR_OK;
	459	}
	460
	461	SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	462	.name = "victor-dmm",
	463	.longname = "Victor DMMs",
	464	.api_version = 1,
	465	.init = init,
	466	.cleanup = cleanup,
	467	.scan = scan,
	468	.dev_list = dev_list,
	469	.dev_clear = clear_instances,
	470	.config_get = config_get,
	471	.config_set = config_set,
	472	.config_list = config_list,
	473	.dev_open = dev_open,
	474	.dev_close = dev_close,
	475	.dev_acquisition_start = dev_acquisition_start,
	476	.dev_acquisition_stop = dev_acquisition_stop,
	477	.priv = NULL,
	478	};