[libsigrok.git] / src / 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 <config.h>
#include <glib.h>
#include <libusb.h>
#include <stdlib.h>
#include <string.h>
#include <libsigrok/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)

static int dev_acquisition_stop(struct sr_dev_inst *sdi);

static const uint32_t drvopts[] = {
	SR_CONF_MULTIMETER,
};

static const uint32_t scanopts[] = {
	SR_CONF_CONN,
};

static const uint32_t devopts[] = {
	SR_CONF_CONTINUOUS,
	SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
	SR_CONF_LIMIT_MSEC | SR_CONF_SET,
	SR_CONF_CONN | SR_CONF_GET,
};

static GSList *scan(struct sr_dev_driver *di, GSList *options)
{
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	struct libusb_device_descriptor des;
	libusb_device **devlist;
	GSList *devices;
	int i;
	char connection_id[64];

	(void)options;

	drvc = di->context;

	devices = NULL;
	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	for (i = 0; devlist[i]; i++) {
		libusb_get_device_descriptor(devlist[i], &des);

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

		usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));

		sdi = g_malloc0(sizeof(struct sr_dev_inst));
		sdi->status = SR_ST_INACTIVE;
		sdi->vendor = g_strdup(VICTOR_VENDOR);
		sdi->connection_id = g_strdup(connection_id);
		devc = g_malloc0(sizeof(struct dev_context));
		sr_sw_limits_init(&devc->limits);
		sdi->priv = devc;

		sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "P1");
		sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
				libusb_get_device_address(devlist[i]), NULL);
		sdi->inst_type = SR_INST_USB;

		devices = g_slist_append(devices, sdi);
	}
	libusb_free_device_list(devlist, 1);

	return std_scan_complete(di, devices);
}

static int dev_open(struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di = sdi->driver;
	struct drv_context *drvc = di->context;
	struct sr_usb_dev_inst *usb;
	int ret;

	usb = sdi->conn;

	ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
	if (ret != SR_OK)
		return ret;

	/* 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;

	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 config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc = sdi->priv;
	struct sr_usb_dev_inst *usb;
	char str[128];

	(void)cg;

	switch (key) {
	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;
	case SR_CONF_LIMIT_SAMPLES:
	case SR_CONF_LIMIT_MSEC:
		return sr_sw_limits_config_get(&devc->limits, key, data);
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc;

	(void)cg;

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

	devc = sdi->priv;

	return sr_sw_limits_config_set(&devc->limits, key, data);
}

static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	(void)sdi;
	(void)cg;

	switch (key) {
	case SR_CONF_SCAN_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
				scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
		break;
	case SR_CONF_DEVICE_OPTIONS:
		if (!sdi)
			*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
					drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
		else
			*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
					devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static void LIBUSB_CALL 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);
	} 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 (sr_sw_limits_check(&devc->limits))
				dev_acquisition_stop(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);
		}
	} 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;
	struct sr_dev_inst *sdi;
	struct sr_dev_driver *di;
	struct timeval tv;

	(void)fd;
	(void)revents;

	sdi = cb_data;
	devc = sdi->priv;
	di = sdi->driver;
	drvc = di->context;

	if (sr_sw_limits_check(&devc->limits))
		dev_acquisition_stop(sdi);

	if (sdi->status == SR_ST_STOPPING) {
		usb_source_remove(sdi->session, drvc->sr_ctx);
		dev_close(sdi);
		std_session_send_df_end(sdi);
	}

	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)
{
	struct sr_dev_driver *di = sdi->driver;
	struct drv_context *drvc = di->context;
	struct sr_usb_dev_inst *usb;
	struct libusb_transfer *transfer;
	int ret;
	unsigned char *buf;

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

	usb = sdi->conn;

	std_session_send_df_header(sdi);

	usb_source_add(sdi->session, drvc->sr_ctx, 100,
			handle_events, (void *)sdi);

	buf = g_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,
			(struct sr_dev_inst *)sdi, 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)
{
	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;
}

static struct sr_dev_driver victor_dmm_driver_info = {
	.name = "victor-dmm",
	.longname = "Victor DMMs",
	.api_version = 1,
	.init = std_init,
	.cleanup = std_cleanup,
	.scan = scan,
	.dev_list = std_dev_list,
	.dev_clear = NULL,
	.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,
	.context = NULL,
};
SR_REGISTER_DEV_DRIVER(victor_dmm_driver_info);
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
6ec6c43b	20	#include <config.h>
ac3898d2	21	#include <glib.h>
7a360375 BV	22	#include <libusb.h>
	23	#include <stdlib.h>
	24	#include <string.h>
c1aae900	25	#include <libsigrok/libsigrok.h>
fa773062 UH	26	#include "libsigrok-internal.h"
fa773062 UH	27	#include "protocol.h"
7a360375 BV	28
	29	#define VICTOR_VID 0x1244
	30	#define VICTOR_PID 0xd237
	31	#define VICTOR_VENDOR "Victor"
	32	#define VICTOR_INTERFACE 0
1a46cc62	33	#define VICTOR_ENDPOINT (LIBUSB_ENDPOINT_IN \| 1)
d9251a2c	34
695dc859	35	static int dev_acquisition_stop(struct sr_dev_inst *sdi);
7a360375	36
55333928 BV	37	static const uint32_t drvopts[] = {
	38	SR_CONF_MULTIMETER,
	39	};
1beccaed	40
a0e0bb41	41	static const uint32_t scanopts[] = {
ac046ef8 BV	42	SR_CONF_CONN,
	43	};
	44
f254bc4b	45	static const uint32_t devopts[] = {
1953564a	46	SR_CONF_CONTINUOUS,
5827f61b BV	47	SR_CONF_LIMIT_SAMPLES \| SR_CONF_SET,
5827f61b BV	48	SR_CONF_LIMIT_MSEC \| SR_CONF_SET,
55333928	49	SR_CONF_CONN \| SR_CONF_GET,
7a360375 BV	50	};
7a360375 BV	51
4f840ce9	52	static GSList scan(struct sr_dev_driver di, GSList *options)
ac3898d2 BV	53	{
ac3898d2 BV	54	struct drv_context *drvc;
7a360375 BV	55	struct dev_context *devc;
7a360375 BV	56	struct sr_dev_inst *sdi;
7a360375 BV	57	struct libusb_device_descriptor des;
7a360375 BV	58	libusb_device **devlist;
ac3898d2	59	GSList *devices;
2a8f2d41	60	int i;
66c91e25	61	char connection_id[64];
ac3898d2 BV	62
	63	(void)options;
	64
41812aca	65	drvc = di->context;
7a360375	66
ac3898d2	67	devices = NULL;
d4abb463	68	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375	69	for (i = 0; devlist[i]; i++) {
2a8f2d41	70	libusb_get_device_descriptor(devlist[i], &des);
ac3898d2	71
7a360375 BV	72	if (des.idVendor != VICTOR_VID \|\| des.idProduct != VICTOR_PID)
	73	continue;
	74
66c91e25 SA	75	usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
66c91e25 SA	76
aac29cc1	77	sdi = g_malloc0(sizeof(struct sr_dev_inst));
0af636be UH	78	sdi->status = SR_ST_INACTIVE;
0af636be UH	79	sdi->vendor = g_strdup(VICTOR_VENDOR);
66c91e25	80	sdi->connection_id = g_strdup(connection_id);
f57d8ffe	81	devc = g_malloc0(sizeof(struct dev_context));
cf9e86bc	82	sr_sw_limits_init(&devc->limits);
7a360375 BV	83	sdi->priv = devc;
7a360375 BV	84
5e23fcab	85	sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "P1");
91219afc UH	86	sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
91219afc UH	87	libusb_get_device_address(devlist[i]), NULL);
ac046ef8	88	sdi->inst_type = SR_INST_USB;
7a360375	89
7a360375 BV	90	devices = g_slist_append(devices, sdi);
	91	}
	92	libusb_free_device_list(devlist, 1);
ac3898d2	93
15a5bfe4	94	return std_scan_complete(di, devices);
ac3898d2 BV	95	}
ac3898d2 BV	96
6078d2c9	97	static int dev_open(struct sr_dev_inst *sdi)
ac3898d2	98	{
4f840ce9	99	struct sr_dev_driver *di = sdi->driver;
41812aca	100	struct drv_context *drvc = di->context;
ac046ef8	101	struct sr_usb_dev_inst *usb;
4af1f68f	102	int ret;
7a360375	103
ac046ef8 BV	104	usb = sdi->conn;
ac046ef8 BV	105
4af1f68f LPC	106	ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
	107	if (ret != SR_OK)
	108	return ret;
7a360375 BV	109
	110	/* The device reports as HID class, so the kernel would have
	111	* claimed it. */
ac046ef8 BV	112	if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
ac046ef8 BV	113	if ((ret = libusb_detach_kernel_driver(usb->devhdl, 0)) < 0) {
d4928d71 PS	114	sr_err("Failed to detach kernel driver: %s.",
d4928d71 PS	115	libusb_error_name(ret));
7a360375 BV	116	return SR_ERR;
	117	}
	118	}
	119
ac046ef8	120	if ((ret = libusb_claim_interface(usb->devhdl,
7a360375	121	VICTOR_INTERFACE))) {
fa773062	122	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
7a360375 BV	123	return SR_ERR;
	124	}
	125	sdi->status = SR_ST_ACTIVE;
ac3898d2 BV	126
	127	return SR_OK;
	128	}
	129
6078d2c9	130	static int dev_close(struct sr_dev_inst *sdi)
ac3898d2	131	{
ac046ef8	132	struct sr_usb_dev_inst *usb;
7a360375	133
ac046ef8 BV	134	usb = sdi->conn;
	135
	136	if (!usb->devhdl)
d9251a2c	137	/* Nothing to do. */
7a360375 BV	138	return SR_OK;
7a360375 BV	139
ac046ef8 BV	140	libusb_release_interface(usb->devhdl, VICTOR_INTERFACE);
	141	libusb_close(usb->devhdl);
	142	usb->devhdl = NULL;
7a360375	143	sdi->status = SR_ST_INACTIVE;
ac3898d2 BV	144
	145	return SR_OK;
	146	}
	147
584560f1	148	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	149	const struct sr_channel_group *cg)
ac046ef8	150	{
cf9e86bc	151	struct dev_context *devc = sdi->priv;
ac046ef8 BV	152	struct sr_usb_dev_inst *usb;
	153	char str[128];
	154
53b4680f	155	(void)cg;
8f996b89	156
584560f1	157	switch (key) {
ac046ef8 BV	158	case SR_CONF_CONN:
	159	if (!sdi \|\| !sdi->conn)
	160	return SR_ERR_ARG;
	161	usb = sdi->conn;
	162	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	163	*data = g_variant_new_string(str);
	164	break;
cf9e86bc LPC	165	case SR_CONF_LIMIT_SAMPLES:
	166	case SR_CONF_LIMIT_MSEC:
	167	return sr_sw_limits_config_get(&devc->limits, key, data);
ac046ef8 BV	168	default:
	169	return SR_ERR_NA;
	170	}
	171
	172	return SR_OK;
	173	}
	174
584560f1	175	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
53b4680f	176	const struct sr_channel_group *cg)
ac3898d2	177	{
7a360375	178	struct dev_context *devc;
ac3898d2	179
53b4680f	180	(void)cg;
8f996b89	181
e73ffd42 BV	182	if (sdi->status != SR_ST_ACTIVE)
	183	return SR_ERR_DEV_CLOSED;
	184
7a360375	185	devc = sdi->priv;
dcd438ee	186
cf9e86bc	187	return sr_sw_limits_config_set(&devc->limits, key, data);
ac3898d2 BV	188	}
ac3898d2 BV	189
584560f1	190	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	191	const struct sr_channel_group *cg)
a1c743fc	192	{
a1c743fc	193	(void)sdi;
53b4680f	194	(void)cg;
a1c743fc BV	195
a1c743fc BV	196	switch (key) {
ac046ef8	197	case SR_CONF_SCAN_OPTIONS:
584560f1	198	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
a0e0bb41	199	scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
ac046ef8	200	break;
9a6517d1	201	case SR_CONF_DEVICE_OPTIONS:
55333928 BV	202	if (!sdi)
	203	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	204	drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
	205	else
	206	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	207	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
9a6517d1	208	break;
a1c743fc	209	default:
bd6fbf62	210	return SR_ERR_NA;
a1c743fc BV	211	}
	212
	213	return SR_OK;
	214	}
	215
55462b8b	216	static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
7a360375 BV	217	{
	218	struct dev_context *devc;
	219	struct sr_dev_inst *sdi;
	220	int ret;
	221
	222	sdi = transfer->user_data;
	223	devc = sdi->priv;
	224	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	225	/* USB device was unplugged. */
695dc859	226	dev_acquisition_stop(sdi);
7a360375	227	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
fa773062	228	sr_dbg("Got %d-byte packet.", transfer->actual_length);
ff945683 BV	229	if (transfer->actual_length == DMM_DATA_SIZE) {
ff945683 BV	230	victor_dmm_receive_data(sdi, transfer->buffer);
cf9e86bc LPC	231	if (sr_sw_limits_check(&devc->limits))
cf9e86bc LPC	232	dev_acquisition_stop(sdi);
7a360375 BV	233	}
	234	}
	235	/* Anything else is either an error or a timeout, which is fine:
	236	* we were just going to send another transfer request anyway. */
	237
	238	if (sdi->status == SR_ST_ACTIVE) {
	239	/* Send the same request again. */
	240	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062 UH	241	sr_err("Unable to resubmit transfer: %s.",
fa773062 UH	242	libusb_error_name(ret));
7a360375	243	g_free(transfer->buffer);
9ec7ff94	244	libusb_free_transfer(transfer);
695dc859	245	dev_acquisition_stop(sdi);
7a360375 BV	246	}
	247	} else {
	248	/* This was the last transfer we're going to receive, so
	249	* clean up now. */
7a360375	250	g_free(transfer->buffer);
9ec7ff94	251	libusb_free_transfer(transfer);
7a360375	252	}
7a360375 BV	253	}
	254
	255	static int handle_events(int fd, int revents, void *cb_data)
	256	{
	257	struct dev_context *devc;
4f840ce9	258	struct drv_context *drvc;
7a360375	259	struct sr_dev_inst *sdi;
4f840ce9	260	struct sr_dev_driver *di;
7a360375	261	struct timeval tv;
7a360375 BV	262
	263	(void)fd;
	264	(void)revents;
	265
	266	sdi = cb_data;
	267	devc = sdi->priv;
4f840ce9	268	di = sdi->driver;
41812aca	269	drvc = di->context;
7a360375	270
cf9e86bc LPC	271	if (sr_sw_limits_check(&devc->limits))
cf9e86bc LPC	272	dev_acquisition_stop(sdi);
7a360375 BV	273
7a360375 BV	274	if (sdi->status == SR_ST_STOPPING) {
102f1239	275	usb_source_remove(sdi->session, drvc->sr_ctx);
6078d2c9	276	dev_close(sdi);
bee2b016	277	std_session_send_df_end(sdi);
7a360375 BV	278	}
	279
	280	memset(&tv, 0, sizeof(struct timeval));
d4abb463 PS	281	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
d4abb463 PS	282	NULL);
7a360375 BV	283
	284	return TRUE;
	285	}
	286
695dc859	287	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
ac3898d2	288	{
4f840ce9	289	struct sr_dev_driver *di = sdi->driver;
41812aca	290	struct drv_context *drvc = di->context;
ac046ef8	291	struct sr_usb_dev_inst *usb;
7a360375	292	struct libusb_transfer *transfer;
6c60facc	293	int ret;
7a360375 BV	294	unsigned char *buf;
7a360375 BV	295
e73ffd42 BV	296	if (sdi->status != SR_ST_ACTIVE)
	297	return SR_ERR_DEV_CLOSED;
	298
ac046ef8	299	usb = sdi->conn;
7a360375	300
bee2b016	301	std_session_send_df_header(sdi);
7a360375	302
102f1239 BV	303	usb_source_add(sdi->session, drvc->sr_ctx, 100,
102f1239 BV	304	handle_events, (void *)sdi);
7a360375	305
a95f142e	306	buf = g_malloc(DMM_DATA_SIZE);
7a360375 BV	307	transfer = libusb_alloc_transfer(0);
	308	/* Each transfer request gets 100ms to arrive before it's restarted.
	309	* The device only sends 1 transfer/second no matter how many
	310	* times you ask, but we want to keep step with the USB events
	311	* handling above. */
ac046ef8	312	libusb_fill_interrupt_transfer(transfer, usb->devhdl,
fa773062	313	VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
695dc859	314	(struct sr_dev_inst *)sdi, 100);
7a360375	315	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062	316	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
7a360375 BV	317	libusb_free_transfer(transfer);
	318	g_free(buf);
	319	return SR_ERR;
	320	}
ac3898d2 BV	321
	322	return SR_OK;
	323	}
	324
695dc859	325	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
ac3898d2	326	{
ac3898d2	327	if (sdi->status != SR_ST_ACTIVE) {
7a360375	328	sr_err("Device not active, can't stop acquisition.");
ac3898d2 BV	329	return SR_ERR;
	330	}
	331
7a360375	332	sdi->status = SR_ST_STOPPING;
ac3898d2 BV	333
	334	return SR_OK;
	335	}
	336
dd5c48a6	337	static struct sr_dev_driver victor_dmm_driver_info = {
ac3898d2	338	.name = "victor-dmm",
7a360375	339	.longname = "Victor DMMs",
ac3898d2	340	.api_version = 1,
c2fdcc25	341	.init = std_init,
700d6b64	342	.cleanup = std_cleanup,
6078d2c9	343	.scan = scan,
c01bf34c	344	.dev_list = std_dev_list,
a6630742	345	.dev_clear = NULL,
ac046ef8	346	.config_get = config_get,
035a1078	347	.config_set = config_set,
a1c743fc	348	.config_list = config_list,
6078d2c9 UH	349	.dev_open = dev_open,
	350	.dev_close = dev_close,
	351	.dev_acquisition_start = dev_acquisition_start,
	352	.dev_acquisition_stop = dev_acquisition_stop,
41812aca	353	.context = NULL,
ac3898d2	354	};
dd5c48a6	355	SR_REGISTER_DEV_DRIVER(victor_dmm_driver_info);