[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)

SR_PRIV struct sr_dev_driver victor_dmm_driver_info;
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 int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
{
	return std_init(di, sr_ctx, LOG_PREFIX);
}

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->driver = di;
		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;

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

	return 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, LOG_PREFIX);
	}

	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, LOG_PREFIX);

	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;
}

SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	.name = "victor-dmm",
	.longname = "Victor DMMs",
	.api_version = 1,
	.init = 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,
};
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)
ac3898d2 BV	34
ac3898d2 BV	35	SR_PRIV struct sr_dev_driver victor_dmm_driver_info;
695dc859	36	static int dev_acquisition_stop(struct sr_dev_inst *sdi);
7a360375	37
55333928 BV	38	static const uint32_t drvopts[] = {
	39	SR_CONF_MULTIMETER,
	40	};
1beccaed	41
a0e0bb41	42	static const uint32_t scanopts[] = {
ac046ef8 BV	43	SR_CONF_CONN,
	44	};
	45
f254bc4b	46	static const uint32_t devopts[] = {
1953564a	47	SR_CONF_CONTINUOUS,
5827f61b BV	48	SR_CONF_LIMIT_SAMPLES \| SR_CONF_SET,
5827f61b BV	49	SR_CONF_LIMIT_MSEC \| SR_CONF_SET,
55333928	50	SR_CONF_CONN \| SR_CONF_GET,
7a360375 BV	51	};
7a360375 BV	52
4f840ce9	53	static int init(struct sr_dev_driver di, struct sr_context sr_ctx)
ac3898d2	54	{
1f8f5bc0	55	return std_init(di, sr_ctx, LOG_PREFIX);
ac3898d2 BV	56	}
ac3898d2 BV	57
4f840ce9	58	static GSList scan(struct sr_dev_driver di, GSList *options)
ac3898d2 BV	59	{
ac3898d2 BV	60	struct drv_context *drvc;
7a360375 BV	61	struct dev_context *devc;
7a360375 BV	62	struct sr_dev_inst *sdi;
7a360375 BV	63	struct libusb_device_descriptor des;
7a360375 BV	64	libusb_device **devlist;
ac3898d2	65	GSList *devices;
2a8f2d41	66	int i;
66c91e25	67	char connection_id[64];
ac3898d2 BV	68
	69	(void)options;
	70
41812aca	71	drvc = di->context;
7a360375	72
ac3898d2	73	devices = NULL;
d4abb463	74	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375	75	for (i = 0; devlist[i]; i++) {
2a8f2d41	76	libusb_get_device_descriptor(devlist[i], &des);
ac3898d2	77
7a360375 BV	78	if (des.idVendor != VICTOR_VID \|\| des.idProduct != VICTOR_PID)
	79	continue;
	80
66c91e25 SA	81	usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
66c91e25 SA	82
aac29cc1	83	sdi = g_malloc0(sizeof(struct sr_dev_inst));
0af636be UH	84	sdi->status = SR_ST_INACTIVE;
0af636be UH	85	sdi->vendor = g_strdup(VICTOR_VENDOR);
7a360375	86	sdi->driver = di;
66c91e25	87	sdi->connection_id = g_strdup(connection_id);
f57d8ffe	88	devc = g_malloc0(sizeof(struct dev_context));
cf9e86bc	89	sr_sw_limits_init(&devc->limits);
7a360375 BV	90	sdi->priv = devc;
7a360375 BV	91
5e23fcab	92	sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "P1");
91219afc UH	93	sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
91219afc UH	94	libusb_get_device_address(devlist[i]), NULL);
ac046ef8	95	sdi->inst_type = SR_INST_USB;
7a360375 BV	96
	97	drvc->instances = g_slist_append(drvc->instances, sdi);
	98	devices = g_slist_append(devices, sdi);
	99	}
	100	libusb_free_device_list(devlist, 1);
ac3898d2 BV	101
	102	return devices;
	103	}
	104
6078d2c9	105	static int dev_open(struct sr_dev_inst *sdi)
ac3898d2	106	{
4f840ce9	107	struct sr_dev_driver *di = sdi->driver;
41812aca	108	struct drv_context *drvc = di->context;
ac046ef8	109	struct sr_usb_dev_inst *usb;
4af1f68f	110	int ret;
7a360375	111
ac046ef8 BV	112	usb = sdi->conn;
ac046ef8 BV	113
4af1f68f LPC	114	ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
	115	if (ret != SR_OK)
	116	return ret;
7a360375 BV	117
	118	/* The device reports as HID class, so the kernel would have
	119	* claimed it. */
ac046ef8 BV	120	if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
ac046ef8 BV	121	if ((ret = libusb_detach_kernel_driver(usb->devhdl, 0)) < 0) {
d4928d71 PS	122	sr_err("Failed to detach kernel driver: %s.",
d4928d71 PS	123	libusb_error_name(ret));
7a360375 BV	124	return SR_ERR;
	125	}
	126	}
	127
ac046ef8	128	if ((ret = libusb_claim_interface(usb->devhdl,
7a360375	129	VICTOR_INTERFACE))) {
fa773062	130	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
7a360375 BV	131	return SR_ERR;
	132	}
	133	sdi->status = SR_ST_ACTIVE;
ac3898d2 BV	134
	135	return SR_OK;
	136	}
	137
6078d2c9	138	static int dev_close(struct sr_dev_inst *sdi)
ac3898d2	139	{
ac046ef8	140	struct sr_usb_dev_inst *usb;
7a360375	141
ac046ef8 BV	142	usb = sdi->conn;
	143
	144	if (!usb->devhdl)
7a360375 BV	145	/* Nothing to do. */
	146	return SR_OK;
	147
ac046ef8 BV	148	libusb_release_interface(usb->devhdl, VICTOR_INTERFACE);
	149	libusb_close(usb->devhdl);
	150	usb->devhdl = NULL;
7a360375	151	sdi->status = SR_ST_INACTIVE;
ac3898d2 BV	152
	153	return SR_OK;
	154	}
	155
584560f1	156	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	157	const struct sr_channel_group *cg)
ac046ef8	158	{
cf9e86bc	159	struct dev_context *devc = sdi->priv;
ac046ef8 BV	160	struct sr_usb_dev_inst *usb;
	161	char str[128];
	162
53b4680f	163	(void)cg;
8f996b89	164
584560f1	165	switch (key) {
ac046ef8 BV	166	case SR_CONF_CONN:
	167	if (!sdi \|\| !sdi->conn)
	168	return SR_ERR_ARG;
	169	usb = sdi->conn;
	170	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	171	*data = g_variant_new_string(str);
	172	break;
cf9e86bc LPC	173	case SR_CONF_LIMIT_SAMPLES:
	174	case SR_CONF_LIMIT_MSEC:
	175	return sr_sw_limits_config_get(&devc->limits, key, data);
ac046ef8 BV	176	default:
	177	return SR_ERR_NA;
	178	}
	179
	180	return SR_OK;
	181	}
	182
584560f1	183	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
53b4680f	184	const struct sr_channel_group *cg)
ac3898d2	185	{
7a360375	186	struct dev_context *devc;
ac3898d2	187
53b4680f	188	(void)cg;
8f996b89	189
e73ffd42 BV	190	if (sdi->status != SR_ST_ACTIVE)
	191	return SR_ERR_DEV_CLOSED;
	192
7a360375	193	devc = sdi->priv;
dcd438ee	194
cf9e86bc	195	return sr_sw_limits_config_set(&devc->limits, key, data);
ac3898d2 BV	196	}
ac3898d2 BV	197
584560f1	198	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	199	const struct sr_channel_group *cg)
a1c743fc	200	{
a1c743fc	201	(void)sdi;
53b4680f	202	(void)cg;
a1c743fc BV	203
a1c743fc BV	204	switch (key) {
ac046ef8	205	case SR_CONF_SCAN_OPTIONS:
584560f1	206	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
a0e0bb41	207	scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
ac046ef8	208	break;
9a6517d1	209	case SR_CONF_DEVICE_OPTIONS:
55333928 BV	210	if (!sdi)
	211	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	212	drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
	213	else
	214	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	215	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
9a6517d1	216	break;
a1c743fc	217	default:
bd6fbf62	218	return SR_ERR_NA;
a1c743fc BV	219	}
	220
	221	return SR_OK;
	222	}
	223
55462b8b	224	static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
7a360375 BV	225	{
	226	struct dev_context *devc;
	227	struct sr_dev_inst *sdi;
	228	int ret;
	229
	230	sdi = transfer->user_data;
	231	devc = sdi->priv;
	232	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	233	/* USB device was unplugged. */
695dc859	234	dev_acquisition_stop(sdi);
7a360375	235	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
fa773062	236	sr_dbg("Got %d-byte packet.", transfer->actual_length);
ff945683 BV	237	if (transfer->actual_length == DMM_DATA_SIZE) {
ff945683 BV	238	victor_dmm_receive_data(sdi, transfer->buffer);
cf9e86bc LPC	239	if (sr_sw_limits_check(&devc->limits))
cf9e86bc LPC	240	dev_acquisition_stop(sdi);
7a360375 BV	241	}
	242	}
	243	/* Anything else is either an error or a timeout, which is fine:
	244	* we were just going to send another transfer request anyway. */
	245
	246	if (sdi->status == SR_ST_ACTIVE) {
	247	/* Send the same request again. */
	248	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062 UH	249	sr_err("Unable to resubmit transfer: %s.",
fa773062 UH	250	libusb_error_name(ret));
7a360375	251	g_free(transfer->buffer);
9ec7ff94	252	libusb_free_transfer(transfer);
695dc859	253	dev_acquisition_stop(sdi);
7a360375 BV	254	}
	255	} else {
	256	/* This was the last transfer we're going to receive, so
	257	* clean up now. */
7a360375	258	g_free(transfer->buffer);
9ec7ff94	259	libusb_free_transfer(transfer);
7a360375	260	}
7a360375 BV	261	}
	262
	263	static int handle_events(int fd, int revents, void *cb_data)
	264	{
	265	struct dev_context *devc;
4f840ce9	266	struct drv_context *drvc;
7a360375	267	struct sr_dev_inst *sdi;
4f840ce9	268	struct sr_dev_driver *di;
7a360375	269	struct timeval tv;
7a360375 BV	270
	271	(void)fd;
	272	(void)revents;
	273
	274	sdi = cb_data;
	275	devc = sdi->priv;
4f840ce9	276	di = sdi->driver;
41812aca	277	drvc = di->context;
7a360375	278
cf9e86bc LPC	279	if (sr_sw_limits_check(&devc->limits))
cf9e86bc LPC	280	dev_acquisition_stop(sdi);
7a360375 BV	281
7a360375 BV	282	if (sdi->status == SR_ST_STOPPING) {
102f1239	283	usb_source_remove(sdi->session, drvc->sr_ctx);
6078d2c9	284	dev_close(sdi);
3be42bc2	285	std_session_send_df_end(sdi, LOG_PREFIX);
7a360375 BV	286	}
	287
	288	memset(&tv, 0, sizeof(struct timeval));
d4abb463 PS	289	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
d4abb463 PS	290	NULL);
7a360375 BV	291
	292	return TRUE;
	293	}
	294
695dc859	295	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
ac3898d2	296	{
4f840ce9	297	struct sr_dev_driver *di = sdi->driver;
41812aca	298	struct drv_context *drvc = di->context;
ac046ef8	299	struct sr_usb_dev_inst *usb;
7a360375	300	struct libusb_transfer *transfer;
6c60facc	301	int ret;
7a360375 BV	302	unsigned char *buf;
7a360375 BV	303
e73ffd42 BV	304	if (sdi->status != SR_ST_ACTIVE)
	305	return SR_ERR_DEV_CLOSED;
	306
ac046ef8	307	usb = sdi->conn;
7a360375	308
695dc859	309	std_session_send_df_header(sdi, LOG_PREFIX);
7a360375	310
102f1239 BV	311	usb_source_add(sdi->session, drvc->sr_ctx, 100,
102f1239 BV	312	handle_events, (void *)sdi);
7a360375	313
a95f142e	314	buf = g_malloc(DMM_DATA_SIZE);
7a360375 BV	315	transfer = libusb_alloc_transfer(0);
	316	/* Each transfer request gets 100ms to arrive before it's restarted.
	317	* The device only sends 1 transfer/second no matter how many
	318	* times you ask, but we want to keep step with the USB events
	319	* handling above. */
ac046ef8	320	libusb_fill_interrupt_transfer(transfer, usb->devhdl,
fa773062	321	VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
695dc859	322	(struct sr_dev_inst *)sdi, 100);
7a360375	323	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062	324	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
7a360375 BV	325	libusb_free_transfer(transfer);
	326	g_free(buf);
	327	return SR_ERR;
	328	}
ac3898d2 BV	329
	330	return SR_OK;
	331	}
	332
695dc859	333	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
ac3898d2	334	{
ac3898d2	335	if (sdi->status != SR_ST_ACTIVE) {
7a360375	336	sr_err("Device not active, can't stop acquisition.");
ac3898d2 BV	337	return SR_ERR;
	338	}
	339
7a360375	340	sdi->status = SR_ST_STOPPING;
ac3898d2 BV	341
	342	return SR_OK;
	343	}
	344
	345	SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	346	.name = "victor-dmm",
7a360375	347	.longname = "Victor DMMs",
ac3898d2	348	.api_version = 1,
6078d2c9	349	.init = init,
700d6b64	350	.cleanup = std_cleanup,
6078d2c9	351	.scan = scan,
c01bf34c	352	.dev_list = std_dev_list,
a6630742	353	.dev_clear = NULL,
ac046ef8	354	.config_get = config_get,
035a1078	355	.config_set = config_set,
a1c743fc	356	.config_list = config_list,
6078d2c9 UH	357	.dev_open = dev_open,
	358	.dev_close = dev_close,
	359	.dev_acquisition_start = dev_acquisition_start,
	360	.dev_acquisition_stop = dev_acquisition_stop,
41812aca	361	.context = NULL,
ac3898d2	362	};