[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_HWCAP_MULTIMETER,
	SR_HWCAP_LIMIT_MSEC,
	SR_HWCAP_LIMIT_SAMPLES,
	SR_HWCAP_CONTINUOUS,
	0
};

static const char *probe_names[] = {
	"P1",
	NULL,
};

/* 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 hw_info_get(int info_id, const void **data,
		       const struct sr_dev_inst *sdi)
{
	(void)sdi;

	switch (info_id) {
	case SR_DI_HWCAPS:
		*data = hwcaps;
		break;
	case SR_DI_NUM_PROBES:
		*data = GINT_TO_POINTER(1);
		break;
	case SR_DI_PROBE_NAMES:
		*data = probe_names;
		break;
	default:
		sr_err("Unknown info_id: %d.", info_id);
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
			     const void *value)
{
	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 (hwcap) {
	case SR_HWCAP_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_HWCAP_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.", hwcap);
		ret = SR_ERR_ARG;
	}

	return ret;
}

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 sr_datafeed_meta_analog meta;
	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);

	/* Send metadata about the SR_DF_ANALOG packets to come. */
	packet.type = SR_DF_META_ANALOG;
	packet.payload = &meta;
	meta.num_probes = 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,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.info_get = hw_info_get,
	.dev_config_set = hw_dev_config_set,
	.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[] = {
	40	SR_HWCAP_MULTIMETER,
	41	SR_HWCAP_LIMIT_MSEC,
	42	SR_HWCAP_LIMIT_SAMPLES,
	43	SR_HWCAP_CONTINUOUS,
	44	0
	45	};
	46
	47	static const char *probe_names[] = {
	48	"P1",
78693401	49	NULL,
7a360375 BV	50	};
7a360375 BV	51
ac3898d2 BV	52	/* Properly close and free all devices. */
	53	static int clear_instances(void)
	54	{
	55	struct sr_dev_inst *sdi;
	56	struct drv_context *drvc;
	57	struct dev_context *devc;
	58	GSList *l;
	59
7a360375 BV	60	if (!(drvc = di->priv))
	61	/* Can get called on an unused driver, doesn't matter. */
	62	return SR_OK;
	63
ac3898d2 BV	64	for (l = drvc->instances; l; l = l->next) {
	65	if (!(sdi = l->data))
	66	continue;
	67	if (!(devc = sdi->priv))
	68	continue;
7a360375 BV	69	hw_dev_close(sdi);
7a360375 BV	70	sr_usb_dev_inst_free(devc->usb);
ac3898d2 BV	71	sr_dev_inst_free(sdi);
	72	}
	73
	74	g_slist_free(drvc->instances);
	75	drvc->instances = NULL;
	76
	77	return SR_OK;
	78	}
	79
34f06b90	80	static int hw_init(struct sr_context *sr_ctx)
ac3898d2 BV	81	{
	82	struct drv_context *drvc;
	83
	84	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	85	sr_err("Driver context malloc failed.");
	86	return SR_ERR_MALLOC;
	87	}
1ebe4b4e	88	drvc->sr_ctx = sr_ctx;
ac3898d2 BV	89	di->priv = drvc;
	90
	91	return SR_OK;
	92	}
	93
	94	static GSList hw_scan(GSList options)
	95	{
	96	struct drv_context *drvc;
7a360375 BV	97	struct dev_context *devc;
	98	struct sr_dev_inst *sdi;
	99	struct sr_probe *probe;
	100	struct libusb_device_descriptor des;
	101	libusb_device **devlist;
ac3898d2	102	GSList *devices;
7a360375	103	int ret, devcnt, i;
ac3898d2 BV	104
	105	(void)options;
	106
7a360375 BV	107	if (!(drvc = di->priv)) {
	108	sr_err("Driver was not initialized.");
	109	return NULL;
	110	}
	111
	112	/* USB scan is always authoritative. */
	113	clear_instances();
	114
ac3898d2	115	devices = NULL;
d4abb463	116	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375 BV	117	for (i = 0; devlist[i]; i++) {
	118	if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
	119	sr_warn("Failed to get device descriptor: %s",
	120	libusb_error_name(ret));
	121	continue;
	122	}
ac3898d2	123
7a360375 BV	124	if (des.idVendor != VICTOR_VID \|\| des.idProduct != VICTOR_PID)
	125	continue;
	126
	127	devcnt = g_slist_length(drvc->instances);
fa773062 UH	128	if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
fa773062 UH	129	VICTOR_VENDOR, NULL, NULL)))
7a360375 BV	130	return NULL;
	131	sdi->driver = di;
	132
	133	if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
	134	return NULL;
	135	sdi->priv = devc;
	136
	137	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	138	return NULL;
	139	sdi->probes = g_slist_append(NULL, probe);
	140
	141	if (!(devc->usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
	142	libusb_get_device_address(devlist[i]), NULL)))
	143	return NULL;
	144
	145	drvc->instances = g_slist_append(drvc->instances, sdi);
	146	devices = g_slist_append(devices, sdi);
	147	}
	148	libusb_free_device_list(devlist, 1);
ac3898d2 BV	149
	150	return devices;
	151	}
	152
	153	static GSList *hw_dev_list(void)
	154	{
	155	struct drv_context *drvc;
	156
7a360375 BV	157	if (!(drvc = di->priv)) {
	158	sr_err("Driver was not initialized.");
	159	return NULL;
	160	}
ac3898d2 BV	161
	162	return drvc->instances;
	163	}
	164
	165	static int hw_dev_open(struct sr_dev_inst *sdi)
	166	{
7a360375	167	struct dev_context *devc;
d4abb463	168	struct drv_context *drvc = di->priv;
7a360375 BV	169	libusb_device **devlist;
	170	int ret, i;
	171
	172	if (!di->priv) {
	173	sr_err("Driver was not initialized.");
	174	return SR_ERR;
	175	}
	176
	177	devc = sdi->priv;
d4abb463	178	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375 BV	179	for (i = 0; devlist[i]; i++) {
	180	if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
	181	\|\| libusb_get_device_address(devlist[i]) != devc->usb->address)
	182	continue;
	183	if ((ret = libusb_open(devlist[i], &devc->usb->devhdl))) {
fa773062	184	sr_err("Failed to open device: %s.", libusb_error_name(ret));
7a360375 BV	185	return SR_ERR;
	186	}
	187	break;
	188	}
	189	libusb_free_device_list(devlist, 1);
	190	if (!devlist[i]) {
	191	sr_err("Device not found.");
	192	return SR_ERR;
	193	}
	194
	195	/* The device reports as HID class, so the kernel would have
	196	* claimed it. */
	197	if (libusb_kernel_driver_active(devc->usb->devhdl, 0) == 1) {
d4928d71 PS	198	if ((ret = libusb_detach_kernel_driver(devc->usb->devhdl, 0)) < 0) {
	199	sr_err("Failed to detach kernel driver: %s.",
	200	libusb_error_name(ret));
7a360375 BV	201	return SR_ERR;
	202	}
	203	}
	204
	205	if ((ret = libusb_claim_interface(devc->usb->devhdl,
	206	VICTOR_INTERFACE))) {
fa773062	207	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
7a360375 BV	208	return SR_ERR;
	209	}
	210	sdi->status = SR_ST_ACTIVE;
ac3898d2 BV	211
	212	return SR_OK;
	213	}
	214
	215	static int hw_dev_close(struct sr_dev_inst *sdi)
	216	{
7a360375 BV	217	struct dev_context *devc;
	218
	219	if (!di->priv) {
	220	sr_err("Driver was not initialized.");
	221	return SR_ERR;
	222	}
	223
	224	devc = sdi->priv;
	225	if (!devc->usb->devhdl)
	226	/* Nothing to do. */
	227	return SR_OK;
	228
	229	libusb_release_interface(devc->usb->devhdl, VICTOR_INTERFACE);
	230	libusb_close(devc->usb->devhdl);
	231	devc->usb->devhdl = NULL;
	232	sdi->status = SR_ST_INACTIVE;
ac3898d2 BV	233
	234	return SR_OK;
	235	}
	236
	237	static int hw_cleanup(void)
	238	{
7a360375 BV	239	struct drv_context *drvc;
	240
	241	if (!(drvc = di->priv))
	242	/* Can get called on an unused driver, doesn't matter. */
	243	return SR_OK;
ac3898d2	244
7a360375 BV	245	clear_instances();
	246	g_free(drvc);
	247	di->priv = NULL;
ac3898d2 BV	248
	249	return SR_OK;
	250	}
	251
	252	static int hw_info_get(int info_id, const void **data,
	253	const struct sr_dev_inst *sdi)
	254	{
7a360375 BV	255	(void)sdi;
7a360375 BV	256
ac3898d2	257	switch (info_id) {
fa773062 UH	258	case SR_DI_HWCAPS:
	259	*data = hwcaps;
	260	break;
	261	case SR_DI_NUM_PROBES:
	262	*data = GINT_TO_POINTER(1);
	263	break;
	264	case SR_DI_PROBE_NAMES:
	265	*data = probe_names;
	266	break;
	267	default:
	268	sr_err("Unknown info_id: %d.", info_id);
	269	return SR_ERR_ARG;
ac3898d2 BV	270	}
	271
	272	return SR_OK;
	273	}
	274
	275	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	276	const void *value)
	277	{
7a360375 BV	278	struct dev_context *devc;
7a360375 BV	279	gint64 now;
ac3898d2 BV	280	int ret;
ac3898d2 BV	281
7a360375 BV	282	if (!di->priv) {
	283	sr_err("Driver was not initialized.");
	284	return SR_ERR;
	285	}
	286
ac3898d2 BV	287	if (sdi->status != SR_ST_ACTIVE) {
	288	sr_err("Device inactive, can't set config options.");
	289	return SR_ERR;
	290	}
	291
7a360375	292	devc = sdi->priv;
ac3898d2 BV	293	ret = SR_OK;
ac3898d2 BV	294	switch (hwcap) {
fa773062 UH	295	case SR_HWCAP_LIMIT_MSEC:
	296	devc->limit_msec = (const int64_t )value;
	297	now = g_get_monotonic_time() / 1000;
	298	devc->end_time = now + devc->limit_msec;
	299	sr_dbg("Setting time limit to %" PRIu64 "ms.",
	300	devc->limit_msec);
	301	break;
	302	case SR_HWCAP_LIMIT_SAMPLES:
	303	devc->limit_samples = (const uint64_t )value;
	304	sr_dbg("Setting sample limit to %" PRIu64 ".",
	305	devc->limit_samples);
	306	break;
ac3898d2 BV	307	default:
	308	sr_err("Unknown hardware capability: %d.", hwcap);
	309	ret = SR_ERR_ARG;
	310	}
	311
	312	return ret;
	313	}
	314
7a360375 BV	315	static void receive_transfer(struct libusb_transfer *transfer)
	316	{
	317	struct dev_context *devc;
	318	struct sr_dev_inst *sdi;
	319	int ret;
	320
	321	sdi = transfer->user_data;
	322	devc = sdi->priv;
	323	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	324	/* USB device was unplugged. */
	325	hw_dev_acquisition_stop(sdi, sdi);
	326	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
fa773062	327	sr_dbg("Got %d-byte packet.", transfer->actual_length);
ff945683 BV	328	if (transfer->actual_length == DMM_DATA_SIZE) {
ff945683 BV	329	victor_dmm_receive_data(sdi, transfer->buffer);
7a360375 BV	330	if (devc->limit_samples) {
	331	if (devc->num_samples >= devc->limit_samples)
	332	hw_dev_acquisition_stop(sdi, sdi);
	333	}
	334	}
	335	}
	336	/* Anything else is either an error or a timeout, which is fine:
	337	* we were just going to send another transfer request anyway. */
	338
	339	if (sdi->status == SR_ST_ACTIVE) {
	340	/* Send the same request again. */
	341	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062 UH	342	sr_err("Unable to resubmit transfer: %s.",
fa773062 UH	343	libusb_error_name(ret));
7a360375	344	g_free(transfer->buffer);
9ec7ff94	345	libusb_free_transfer(transfer);
7a360375 BV	346	hw_dev_acquisition_stop(sdi, sdi);
	347	}
	348	} else {
	349	/* This was the last transfer we're going to receive, so
	350	* clean up now. */
7a360375	351	g_free(transfer->buffer);
9ec7ff94	352	libusb_free_transfer(transfer);
7a360375	353	}
7a360375 BV	354	}
	355
	356	static int handle_events(int fd, int revents, void *cb_data)
	357	{
	358	struct dev_context *devc;
d4abb463	359	struct drv_context *drvc = di->priv;
7a360375 BV	360	struct sr_datafeed_packet packet;
	361	struct sr_dev_inst *sdi;
	362	struct timeval tv;
	363	gint64 now;
	364	int i;
	365
	366	(void)fd;
	367	(void)revents;
	368
	369	sdi = cb_data;
	370	devc = sdi->priv;
	371
	372	if (devc->limit_msec) {
	373	now = g_get_monotonic_time() / 1000;
	374	if (now > devc->end_time)
	375	hw_dev_acquisition_stop(sdi, sdi);
	376	}
	377
	378	if (sdi->status == SR_ST_STOPPING) {
	379	for (i = 0; devc->usbfd[i] != -1; i++)
	380	sr_source_remove(devc->usbfd[i]);
	381
	382	hw_dev_close(sdi);
	383
	384	packet.type = SR_DF_END;
	385	sr_session_send(cb_data, &packet);
	386	}
	387
	388	memset(&tv, 0, sizeof(struct timeval));
d4abb463 PS	389	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
d4abb463 PS	390	NULL);
7a360375 BV	391
	392	return TRUE;
	393	}
	394
ac3898d2 BV	395	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	396	void *cb_data)
	397	{
7a360375 BV	398	struct sr_datafeed_packet packet;
	399	struct sr_datafeed_header header;
	400	struct sr_datafeed_meta_analog meta;
	401	struct dev_context *devc;
d4abb463	402	struct drv_context *drvc = di->priv;
7a360375 BV	403	const struct libusb_pollfd **pfd;
	404	struct libusb_transfer *transfer;
	405	int ret, i;
	406	unsigned char *buf;
	407
	408	if (!di->priv) {
	409	sr_err("Driver was not initialized.");
	410	return SR_ERR;
	411	}
	412
	413	sr_dbg("Starting acquisition.");
	414
	415	devc = sdi->priv;
	416	devc->cb_data = cb_data;
	417
	418	/* Send header packet to the session bus. */
	419	sr_dbg("Sending SR_DF_HEADER.");
	420	packet.type = SR_DF_HEADER;
	421	packet.payload = (uint8_t *)&header;
	422	header.feed_version = 1;
	423	sr_session_send(devc->cb_data, &packet);
	424
	425	/* Send metadata about the SR_DF_ANALOG packets to come. */
	426	packet.type = SR_DF_META_ANALOG;
	427	packet.payload = &meta;
	428	meta.num_probes = 1;
	429	sr_session_send(devc->cb_data, &packet);
	430
d4abb463	431	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
7a360375 BV	432	for (i = 0; pfd[i]; i++) {
	433	/* Handle USB events every 100ms, for decent latency. */
	434	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	435	handle_events, (void *)sdi);
	436	/* We'll need to remove this fd later. */
	437	devc->usbfd[i] = pfd[i]->fd;
	438	}
	439	devc->usbfd[i] = -1;
	440
ff945683	441	buf = g_try_malloc(DMM_DATA_SIZE);
7a360375 BV	442	transfer = libusb_alloc_transfer(0);
	443	/* Each transfer request gets 100ms to arrive before it's restarted.
	444	* The device only sends 1 transfer/second no matter how many
	445	* times you ask, but we want to keep step with the USB events
	446	* handling above. */
	447	libusb_fill_interrupt_transfer(transfer, devc->usb->devhdl,
fa773062 UH	448	VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
fa773062 UH	449	cb_data, 100);
7a360375	450	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062	451	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
7a360375 BV	452	libusb_free_transfer(transfer);
	453	g_free(buf);
	454	return SR_ERR;
	455	}
ac3898d2 BV	456
	457	return SR_OK;
	458	}
	459
7a360375	460	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
ac3898d2 BV	461	{
	462	(void)cb_data;
	463
7a360375 BV	464	if (!di->priv) {
	465	sr_err("Driver was not initialized.");
	466	return SR_ERR;
	467	}
	468
ac3898d2	469	if (sdi->status != SR_ST_ACTIVE) {
7a360375	470	sr_err("Device not active, can't stop acquisition.");
ac3898d2 BV	471	return SR_ERR;
	472	}
	473
7a360375	474	sdi->status = SR_ST_STOPPING;
ac3898d2 BV	475
	476	return SR_OK;
	477	}
	478
	479	SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	480	.name = "victor-dmm",
7a360375	481	.longname = "Victor DMMs",
ac3898d2 BV	482	.api_version = 1,
	483	.init = hw_init,
	484	.cleanup = hw_cleanup,
	485	.scan = hw_scan,
	486	.dev_list = hw_dev_list,
	487	.dev_clear = clear_instances,
	488	.dev_open = hw_dev_open,
	489	.dev_close = hw_dev_close,
	490	.info_get = hw_info_get,
	491	.dev_config_set = hw_dev_config_set,
	492	.dev_acquisition_start = hw_dev_acquisition_start,
	493	.dev_acquisition_stop = hw_dev_acquisition_stop,
	494	.priv = NULL,
	495	};