[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 int hwcaps[] = {
	SR_CONF_MULTIMETER,
	SR_CONF_LIMIT_MSEC,
	SR_CONF_LIMIT_SAMPLES,
	SR_CONF_CONTINUOUS,
	0
};

/* 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)
{
	struct drv_context *drvc;

	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
		sr_err("Driver context malloc failed.");
		return SR_ERR_MALLOC;
	}

	drvc->sr_ctx = sr_ctx;
	di->priv = drvc;

	return SR_OK;
}

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;

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

	/* 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)
{
	struct drv_context *drvc;

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

	return drvc->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, const void *value, 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 = *(const int64_t *)value;
		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 = *(const uint64_t *)value;
		sr_dbg("Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	default:
		sr_err("Unknown hardware capability: %d.", id);
		ret = SR_ERR_ARG;
	}

	return ret;
}

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

	(void)sdi;

	switch (key) {
	case SR_CONF_DEVICE_OPTIONS:
		*data = hwcaps;
		break;
	default:
		return SR_ERR_ARG;
	}

	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 sr_datafeed_packet packet;
	struct sr_datafeed_header header;
	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;
	}

	sr_dbg("Starting acquisition.");

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

	/* Send header packet to the session bus. */
	sr_dbg("Sending SR_DF_HEADER.");
	packet.type = SR_DF_HEADER;
	packet.payload = (uint8_t *)&header;
	header.feed_version = 1;
	sr_session_send(devc->cb_data, &packet);

	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_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
ac3898d2 BV	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>
7a360375 BV	21	#include <libusb.h>
	22	#include <stdlib.h>
	23	#include <string.h>
fa773062 UH	24	#include "libsigrok.h"
	25	#include "libsigrok-internal.h"
	26	#include "protocol.h"
7a360375 BV	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
ac3898d2 BV	33
	34	SR_PRIV struct sr_dev_driver victor_dmm_driver_info;
	35	static struct sr_dev_driver *di = &victor_dmm_driver_info;
7a360375 BV	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 int hwcaps[] = {
1953564a BV	40	SR_CONF_MULTIMETER,
	41	SR_CONF_LIMIT_MSEC,
	42	SR_CONF_LIMIT_SAMPLES,
	43	SR_CONF_CONTINUOUS,
7a360375 BV	44	0
	45	};
	46
ac3898d2 BV	47	/* Properly close and free all devices. */
	48	static int clear_instances(void)
	49	{
	50	struct sr_dev_inst *sdi;
	51	struct drv_context *drvc;
	52	struct dev_context *devc;
	53	GSList *l;
	54
7a360375 BV	55	if (!(drvc = di->priv))
	56	/* Can get called on an unused driver, doesn't matter. */
	57	return SR_OK;
	58
ac3898d2 BV	59	for (l = drvc->instances; l; l = l->next) {
	60	if (!(sdi = l->data))
	61	continue;
	62	if (!(devc = sdi->priv))
	63	continue;
7a360375 BV	64	hw_dev_close(sdi);
7a360375 BV	65	sr_usb_dev_inst_free(devc->usb);
ac3898d2 BV	66	sr_dev_inst_free(sdi);
	67	}
	68
	69	g_slist_free(drvc->instances);
	70	drvc->instances = NULL;
	71
	72	return SR_OK;
	73	}
	74
34f06b90	75	static int hw_init(struct sr_context *sr_ctx)
ac3898d2 BV	76	{
	77	struct drv_context *drvc;
	78
	79	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	80	sr_err("Driver context malloc failed.");
	81	return SR_ERR_MALLOC;
	82	}
c0eea11c	83
1ebe4b4e	84	drvc->sr_ctx = sr_ctx;
ac3898d2 BV	85	di->priv = drvc;
	86
	87	return SR_OK;
	88	}
	89
	90	static GSList hw_scan(GSList options)
	91	{
	92	struct drv_context *drvc;
7a360375 BV	93	struct dev_context *devc;
	94	struct sr_dev_inst *sdi;
	95	struct sr_probe *probe;
	96	struct libusb_device_descriptor des;
	97	libusb_device **devlist;
ac3898d2	98	GSList *devices;
7a360375	99	int ret, devcnt, i;
ac3898d2 BV	100
	101	(void)options;
	102
7a360375 BV	103	if (!(drvc = di->priv)) {
	104	sr_err("Driver was not initialized.");
	105	return NULL;
	106	}
	107
	108	/* USB scan is always authoritative. */
	109	clear_instances();
	110
ac3898d2	111	devices = NULL;
d4abb463	112	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375 BV	113	for (i = 0; devlist[i]; i++) {
	114	if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
	115	sr_warn("Failed to get device descriptor: %s",
	116	libusb_error_name(ret));
	117	continue;
	118	}
ac3898d2	119
7a360375 BV	120	if (des.idVendor != VICTOR_VID \|\| des.idProduct != VICTOR_PID)
	121	continue;
	122
	123	devcnt = g_slist_length(drvc->instances);
fa773062 UH	124	if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
fa773062 UH	125	VICTOR_VENDOR, NULL, NULL)))
7a360375 BV	126	return NULL;
	127	sdi->driver = di;
	128
	129	if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
	130	return NULL;
	131	sdi->priv = devc;
	132
	133	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	134	return NULL;
	135	sdi->probes = g_slist_append(NULL, probe);
	136
	137	if (!(devc->usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
	138	libusb_get_device_address(devlist[i]), NULL)))
	139	return NULL;
	140
	141	drvc->instances = g_slist_append(drvc->instances, sdi);
	142	devices = g_slist_append(devices, sdi);
	143	}
	144	libusb_free_device_list(devlist, 1);
ac3898d2 BV	145
	146	return devices;
	147	}
	148
	149	static GSList *hw_dev_list(void)
	150	{
	151	struct drv_context *drvc;
	152
7a360375 BV	153	if (!(drvc = di->priv)) {
	154	sr_err("Driver was not initialized.");
	155	return NULL;
	156	}
ac3898d2 BV	157
	158	return drvc->instances;
	159	}
	160
	161	static int hw_dev_open(struct sr_dev_inst *sdi)
	162	{
7a360375	163	struct dev_context *devc;
d4abb463	164	struct drv_context *drvc = di->priv;
7a360375 BV	165	libusb_device **devlist;
	166	int ret, i;
	167
	168	if (!di->priv) {
	169	sr_err("Driver was not initialized.");
	170	return SR_ERR;
	171	}
	172
	173	devc = sdi->priv;
d4abb463	174	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375 BV	175	for (i = 0; devlist[i]; i++) {
	176	if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
	177	\|\| libusb_get_device_address(devlist[i]) != devc->usb->address)
	178	continue;
	179	if ((ret = libusb_open(devlist[i], &devc->usb->devhdl))) {
fa773062	180	sr_err("Failed to open device: %s.", libusb_error_name(ret));
7a360375 BV	181	return SR_ERR;
	182	}
	183	break;
	184	}
	185	libusb_free_device_list(devlist, 1);
	186	if (!devlist[i]) {
	187	sr_err("Device not found.");
	188	return SR_ERR;
	189	}
	190
	191	/* The device reports as HID class, so the kernel would have
	192	* claimed it. */
	193	if (libusb_kernel_driver_active(devc->usb->devhdl, 0) == 1) {
d4928d71 PS	194	if ((ret = libusb_detach_kernel_driver(devc->usb->devhdl, 0)) < 0) {
	195	sr_err("Failed to detach kernel driver: %s.",
	196	libusb_error_name(ret));
7a360375 BV	197	return SR_ERR;
	198	}
	199	}
	200
	201	if ((ret = libusb_claim_interface(devc->usb->devhdl,
	202	VICTOR_INTERFACE))) {
fa773062	203	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
7a360375 BV	204	return SR_ERR;
	205	}
	206	sdi->status = SR_ST_ACTIVE;
ac3898d2 BV	207
	208	return SR_OK;
	209	}
	210
	211	static int hw_dev_close(struct sr_dev_inst *sdi)
	212	{
7a360375 BV	213	struct dev_context *devc;
	214
	215	if (!di->priv) {
	216	sr_err("Driver was not initialized.");
	217	return SR_ERR;
	218	}
	219
	220	devc = sdi->priv;
	221	if (!devc->usb->devhdl)
	222	/* Nothing to do. */
	223	return SR_OK;
	224
	225	libusb_release_interface(devc->usb->devhdl, VICTOR_INTERFACE);
	226	libusb_close(devc->usb->devhdl);
	227	devc->usb->devhdl = NULL;
	228	sdi->status = SR_ST_INACTIVE;
ac3898d2 BV	229
	230	return SR_OK;
	231	}
	232
	233	static int hw_cleanup(void)
	234	{
7a360375 BV	235	struct drv_context *drvc;
	236
	237	if (!(drvc = di->priv))
	238	/* Can get called on an unused driver, doesn't matter. */
	239	return SR_OK;
ac3898d2	240
7a360375 BV	241	clear_instances();
	242	g_free(drvc);
	243	di->priv = NULL;
ac3898d2 BV	244
	245	return SR_OK;
	246	}
	247
035a1078	248	static int config_set(int id, const void value, const struct sr_dev_inst sdi)
ac3898d2	249	{
7a360375 BV	250	struct dev_context *devc;
7a360375 BV	251	gint64 now;
ac3898d2 BV	252	int ret;
ac3898d2 BV	253
7a360375 BV	254	if (!di->priv) {
	255	sr_err("Driver was not initialized.");
	256	return SR_ERR;
	257	}
	258
ac3898d2 BV	259	if (sdi->status != SR_ST_ACTIVE) {
	260	sr_err("Device inactive, can't set config options.");
	261	return SR_ERR;
	262	}
	263
7a360375	264	devc = sdi->priv;
ac3898d2	265	ret = SR_OK;
035a1078	266	switch (id) {
1953564a	267	case SR_CONF_LIMIT_MSEC:
fa773062 UH	268	devc->limit_msec = (const int64_t )value;
	269	now = g_get_monotonic_time() / 1000;
	270	devc->end_time = now + devc->limit_msec;
	271	sr_dbg("Setting time limit to %" PRIu64 "ms.",
	272	devc->limit_msec);
	273	break;
1953564a	274	case SR_CONF_LIMIT_SAMPLES:
fa773062 UH	275	devc->limit_samples = (const uint64_t )value;
	276	sr_dbg("Setting sample limit to %" PRIu64 ".",
	277	devc->limit_samples);
	278	break;
ac3898d2	279	default:
035a1078	280	sr_err("Unknown hardware capability: %d.", id);
ac3898d2 BV	281	ret = SR_ERR_ARG;
	282	}
	283
	284	return ret;
	285	}
	286
a1c743fc BV	287	static int config_list(int key, const void *data, const struct sr_dev_inst sdi)
	288	{
	289
	290	(void)sdi;
	291
	292	switch (key) {
9a6517d1 BV	293	case SR_CONF_DEVICE_OPTIONS:
	294	*data = hwcaps;
	295	break;
a1c743fc BV	296	default:
	297	return SR_ERR_ARG;
	298	}
	299
	300	return SR_OK;
	301	}
	302
7a360375 BV	303	static void receive_transfer(struct libusb_transfer *transfer)
	304	{
	305	struct dev_context *devc;
	306	struct sr_dev_inst *sdi;
	307	int ret;
	308
	309	sdi = transfer->user_data;
	310	devc = sdi->priv;
	311	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	312	/* USB device was unplugged. */
	313	hw_dev_acquisition_stop(sdi, sdi);
	314	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
fa773062	315	sr_dbg("Got %d-byte packet.", transfer->actual_length);
ff945683 BV	316	if (transfer->actual_length == DMM_DATA_SIZE) {
ff945683 BV	317	victor_dmm_receive_data(sdi, transfer->buffer);
7a360375 BV	318	if (devc->limit_samples) {
	319	if (devc->num_samples >= devc->limit_samples)
	320	hw_dev_acquisition_stop(sdi, sdi);
	321	}
	322	}
	323	}
	324	/* Anything else is either an error or a timeout, which is fine:
	325	* we were just going to send another transfer request anyway. */
	326
	327	if (sdi->status == SR_ST_ACTIVE) {
	328	/* Send the same request again. */
	329	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062 UH	330	sr_err("Unable to resubmit transfer: %s.",
fa773062 UH	331	libusb_error_name(ret));
7a360375	332	g_free(transfer->buffer);
9ec7ff94	333	libusb_free_transfer(transfer);
7a360375 BV	334	hw_dev_acquisition_stop(sdi, sdi);
	335	}
	336	} else {
	337	/* This was the last transfer we're going to receive, so
	338	* clean up now. */
7a360375	339	g_free(transfer->buffer);
9ec7ff94	340	libusb_free_transfer(transfer);
7a360375	341	}
7a360375 BV	342	}
	343
	344	static int handle_events(int fd, int revents, void *cb_data)
	345	{
	346	struct dev_context *devc;
d4abb463	347	struct drv_context *drvc = di->priv;
7a360375 BV	348	struct sr_datafeed_packet packet;
	349	struct sr_dev_inst *sdi;
	350	struct timeval tv;
	351	gint64 now;
	352	int i;
	353
	354	(void)fd;
	355	(void)revents;
	356
	357	sdi = cb_data;
	358	devc = sdi->priv;
	359
	360	if (devc->limit_msec) {
	361	now = g_get_monotonic_time() / 1000;
	362	if (now > devc->end_time)
	363	hw_dev_acquisition_stop(sdi, sdi);
	364	}
	365
	366	if (sdi->status == SR_ST_STOPPING) {
	367	for (i = 0; devc->usbfd[i] != -1; i++)
	368	sr_source_remove(devc->usbfd[i]);
	369
	370	hw_dev_close(sdi);
	371
	372	packet.type = SR_DF_END;
	373	sr_session_send(cb_data, &packet);
	374	}
	375
	376	memset(&tv, 0, sizeof(struct timeval));
d4abb463 PS	377	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
d4abb463 PS	378	NULL);
7a360375 BV	379
	380	return TRUE;
	381	}
	382
ac3898d2 BV	383	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	384	void *cb_data)
	385	{
7a360375 BV	386	struct sr_datafeed_packet packet;
7a360375 BV	387	struct sr_datafeed_header header;
7a360375	388	struct dev_context *devc;
d4abb463	389	struct drv_context *drvc = di->priv;
7a360375 BV	390	const struct libusb_pollfd **pfd;
	391	struct libusb_transfer *transfer;
	392	int ret, i;
	393	unsigned char *buf;
	394
	395	if (!di->priv) {
	396	sr_err("Driver was not initialized.");
	397	return SR_ERR;
	398	}
	399
	400	sr_dbg("Starting acquisition.");
	401
	402	devc = sdi->priv;
	403	devc->cb_data = cb_data;
	404
	405	/* Send header packet to the session bus. */
	406	sr_dbg("Sending SR_DF_HEADER.");
	407	packet.type = SR_DF_HEADER;
	408	packet.payload = (uint8_t *)&header;
	409	header.feed_version = 1;
	410	sr_session_send(devc->cb_data, &packet);
	411
d4abb463	412	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
7a360375 BV	413	for (i = 0; pfd[i]; i++) {
	414	/* Handle USB events every 100ms, for decent latency. */
	415	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	416	handle_events, (void *)sdi);
	417	/* We'll need to remove this fd later. */
	418	devc->usbfd[i] = pfd[i]->fd;
	419	}
	420	devc->usbfd[i] = -1;
	421
ff945683	422	buf = g_try_malloc(DMM_DATA_SIZE);
7a360375 BV	423	transfer = libusb_alloc_transfer(0);
	424	/* Each transfer request gets 100ms to arrive before it's restarted.
	425	* The device only sends 1 transfer/second no matter how many
	426	* times you ask, but we want to keep step with the USB events
	427	* handling above. */
	428	libusb_fill_interrupt_transfer(transfer, devc->usb->devhdl,
fa773062 UH	429	VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
fa773062 UH	430	cb_data, 100);
7a360375	431	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062	432	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
7a360375 BV	433	libusb_free_transfer(transfer);
	434	g_free(buf);
	435	return SR_ERR;
	436	}
ac3898d2 BV	437
	438	return SR_OK;
	439	}
	440
7a360375	441	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
ac3898d2 BV	442	{
	443	(void)cb_data;
	444
7a360375 BV	445	if (!di->priv) {
	446	sr_err("Driver was not initialized.");
	447	return SR_ERR;
	448	}
	449
ac3898d2	450	if (sdi->status != SR_ST_ACTIVE) {
7a360375	451	sr_err("Device not active, can't stop acquisition.");
ac3898d2 BV	452	return SR_ERR;
	453	}
	454
7a360375	455	sdi->status = SR_ST_STOPPING;
ac3898d2 BV	456
	457	return SR_OK;
	458	}
	459
	460	SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	461	.name = "victor-dmm",
7a360375	462	.longname = "Victor DMMs",
ac3898d2 BV	463	.api_version = 1,
	464	.init = hw_init,
	465	.cleanup = hw_cleanup,
	466	.scan = hw_scan,
	467	.dev_list = hw_dev_list,
	468	.dev_clear = clear_instances,
035a1078	469	.config_set = config_set,
a1c743fc	470	.config_list = config_list,
ac3898d2 BV	471	.dev_open = hw_dev_open,
ac3898d2 BV	472	.dev_close = hw_dev_close,
ac3898d2 BV	473	.dev_acquisition_start = hw_dev_acquisition_start,
	474	.dev_acquisition_stop = hw_dev_acquisition_stop,
	475	.priv = NULL,
	476	};