[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 hw_dev_close(struct sr_dev_inst *sdi);
static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);

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;
		hw_dev_close(sdi);
		sr_usb_dev_inst_free(devc->usb);
		sr_dev_inst_free(sdi);
	}

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

	return SR_OK;
}

static int hw_init(struct sr_context *sr_ctx)
{
	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
}

static GSList *hw_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;

	/* USB scan is always authoritative. */
	clear_instances();

	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 (!(devc->usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
				libusb_get_device_address(devlist[i]), NULL)))
			return NULL;

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

	return devices;
}

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

static int hw_dev_open(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct drv_context *drvc = di->priv;
	libusb_device **devlist;
	int ret, i;

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

	devc = sdi->priv;
	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	for (i = 0; devlist[i]; i++) {
		if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
				|| libusb_get_device_address(devlist[i]) != devc->usb->address)
			continue;
		if ((ret = libusb_open(devlist[i], &devc->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(devc->usb->devhdl, 0) == 1) {
		if ((ret = libusb_detach_kernel_driver(devc->usb->devhdl, 0)) < 0) {
			sr_err("Failed to detach kernel driver: %s.",
			       libusb_error_name(ret));
			return SR_ERR;
		}
	}

	if ((ret = libusb_claim_interface(devc->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 hw_dev_close(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

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

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

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

	return SR_OK;
}

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

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

	if (sdi->status != SR_ST_ACTIVE) {
		sr_err("Device inactive, can't set config options.");
		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_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. */
		hw_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)
					hw_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);
			hw_dev_acquisition_stop(sdi, sdi);
		}
	} else {
		/* This was the last transfer we're going to receive, so
		 * clean up now. */
		g_free(transfer->buffer);
		libusb_free_transfer(transfer);
	}
}

static int 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)
			hw_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]);

		hw_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 hw_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 libusb_transfer *transfer;
	int ret, i;
	unsigned char *buf;

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

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

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

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