[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(sr_ctx, di, 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));
		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;
	libusb_device **devlist;
	int ret, i;
	char connection_id[64];

	usb = sdi->conn;

	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	for (i = 0; devlist[i]; i++) {
		usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
		if (strcmp(sdi->connection_id, connection_id))
			continue;
		if ((ret = libusb_open(devlist[i], &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(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 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;
	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;
	gint64 now;

	(void)cg;

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

	devc = sdi->priv;

	switch (key) {
	case SR_CONF_LIMIT_MSEC:
		devc->limit_msec = g_variant_get_uint64(data);
		now = g_get_monotonic_time() / 1000;
		devc->end_time = now + devc->limit_msec;
		break;
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

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 (devc->limit_samples) {
				if (devc->num_samples >= devc->limit_samples)
					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;
	gint64 now;

	(void)fd;
	(void)revents;

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

	if (devc->limit_msec) {
		now = g_get_monotonic_time() / 1000;
		if (now > devc->end_time)
			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	{
f6beaac5	55	return std_init(sr_ctx, di, 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));
7a360375 BV	89	sdi->priv = devc;
7a360375 BV	90
5e23fcab	91	sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "P1");
91219afc UH	92	sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
91219afc UH	93	libusb_get_device_address(devlist[i]), NULL);
ac046ef8	94	sdi->inst_type = SR_INST_USB;
7a360375 BV	95
	96	drvc->instances = g_slist_append(drvc->instances, sdi);
	97	devices = g_slist_append(devices, sdi);
	98	}
	99	libusb_free_device_list(devlist, 1);
ac3898d2 BV	100
	101	return devices;
	102	}
	103
6078d2c9	104	static int dev_open(struct sr_dev_inst *sdi)
ac3898d2	105	{
4f840ce9	106	struct sr_dev_driver *di = sdi->driver;
41812aca	107	struct drv_context *drvc = di->context;
ac046ef8	108	struct sr_usb_dev_inst *usb;
7a360375 BV	109	libusb_device **devlist;
7a360375 BV	110	int ret, i;
66c91e25	111	char connection_id[64];
7a360375	112
ac046ef8 BV	113	usb = sdi->conn;
ac046ef8 BV	114
d4abb463	115	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375	116	for (i = 0; devlist[i]; i++) {
66c91e25 SA	117	usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
66c91e25 SA	118	if (strcmp(sdi->connection_id, connection_id))
7a360375	119	continue;
ac046ef8	120	if ((ret = libusb_open(devlist[i], &usb->devhdl))) {
fa773062	121	sr_err("Failed to open device: %s.", libusb_error_name(ret));
7a360375 BV	122	return SR_ERR;
	123	}
	124	break;
	125	}
	126	libusb_free_device_list(devlist, 1);
	127	if (!devlist[i]) {
	128	sr_err("Device not found.");
	129	return SR_ERR;
	130	}
	131
	132	/* The device reports as HID class, so the kernel would have
	133	* claimed it. */
ac046ef8 BV	134	if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
ac046ef8 BV	135	if ((ret = libusb_detach_kernel_driver(usb->devhdl, 0)) < 0) {
d4928d71 PS	136	sr_err("Failed to detach kernel driver: %s.",
d4928d71 PS	137	libusb_error_name(ret));
7a360375 BV	138	return SR_ERR;
	139	}
	140	}
	141
ac046ef8	142	if ((ret = libusb_claim_interface(usb->devhdl,
7a360375	143	VICTOR_INTERFACE))) {
fa773062	144	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
7a360375 BV	145	return SR_ERR;
	146	}
	147	sdi->status = SR_ST_ACTIVE;
ac3898d2 BV	148
	149	return SR_OK;
	150	}
	151
6078d2c9	152	static int dev_close(struct sr_dev_inst *sdi)
ac3898d2	153	{
ac046ef8	154	struct sr_usb_dev_inst *usb;
7a360375	155
ac046ef8 BV	156	usb = sdi->conn;
	157
	158	if (!usb->devhdl)
7a360375 BV	159	/* Nothing to do. */
	160	return SR_OK;
	161
ac046ef8 BV	162	libusb_release_interface(usb->devhdl, VICTOR_INTERFACE);
	163	libusb_close(usb->devhdl);
	164	usb->devhdl = NULL;
7a360375	165	sdi->status = SR_ST_INACTIVE;
ac3898d2 BV	166
	167	return SR_OK;
	168	}
	169
584560f1	170	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	171	const struct sr_channel_group *cg)
ac046ef8 BV	172	{
	173	struct sr_usb_dev_inst *usb;
	174	char str[128];
	175
53b4680f	176	(void)cg;
8f996b89	177
584560f1	178	switch (key) {
ac046ef8 BV	179	case SR_CONF_CONN:
	180	if (!sdi \|\| !sdi->conn)
	181	return SR_ERR_ARG;
	182	usb = sdi->conn;
	183	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	184	*data = g_variant_new_string(str);
	185	break;
	186	default:
	187	return SR_ERR_NA;
	188	}
	189
	190	return SR_OK;
	191	}
	192
584560f1	193	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
53b4680f	194	const struct sr_channel_group *cg)
ac3898d2	195	{
7a360375 BV	196	struct dev_context *devc;
7a360375 BV	197	gint64 now;
ac3898d2	198
53b4680f	199	(void)cg;
8f996b89	200
e73ffd42 BV	201	if (sdi->status != SR_ST_ACTIVE)
	202	return SR_ERR_DEV_CLOSED;
	203
7a360375	204	devc = sdi->priv;
dcd438ee	205
584560f1	206	switch (key) {
1953564a	207	case SR_CONF_LIMIT_MSEC:
a59b4eef	208	devc->limit_msec = g_variant_get_uint64(data);
fa773062 UH	209	now = g_get_monotonic_time() / 1000;
fa773062 UH	210	devc->end_time = now + devc->limit_msec;
fa773062	211	break;
1953564a	212	case SR_CONF_LIMIT_SAMPLES:
a59b4eef	213	devc->limit_samples = g_variant_get_uint64(data);
fa773062	214	break;
ac3898d2	215	default:
dcd438ee	216	return SR_ERR_NA;
ac3898d2 BV	217	}
ac3898d2 BV	218
dcd438ee	219	return SR_OK;
ac3898d2 BV	220	}
ac3898d2 BV	221
584560f1	222	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	223	const struct sr_channel_group *cg)
a1c743fc	224	{
a1c743fc	225	(void)sdi;
53b4680f	226	(void)cg;
a1c743fc BV	227
a1c743fc BV	228	switch (key) {
ac046ef8	229	case SR_CONF_SCAN_OPTIONS:
584560f1	230	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
a0e0bb41	231	scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
ac046ef8	232	break;
9a6517d1	233	case SR_CONF_DEVICE_OPTIONS:
55333928 BV	234	if (!sdi)
	235	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	236	drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
	237	else
	238	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	239	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
9a6517d1	240	break;
a1c743fc	241	default:
bd6fbf62	242	return SR_ERR_NA;
a1c743fc BV	243	}
	244
	245	return SR_OK;
	246	}
	247
55462b8b	248	static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
7a360375 BV	249	{
	250	struct dev_context *devc;
	251	struct sr_dev_inst *sdi;
	252	int ret;
	253
	254	sdi = transfer->user_data;
	255	devc = sdi->priv;
	256	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	257	/* USB device was unplugged. */
695dc859	258	dev_acquisition_stop(sdi);
7a360375	259	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
fa773062	260	sr_dbg("Got %d-byte packet.", transfer->actual_length);
ff945683 BV	261	if (transfer->actual_length == DMM_DATA_SIZE) {
ff945683 BV	262	victor_dmm_receive_data(sdi, transfer->buffer);
7a360375 BV	263	if (devc->limit_samples) {
7a360375 BV	264	if (devc->num_samples >= devc->limit_samples)
695dc859	265	dev_acquisition_stop(sdi);
7a360375 BV	266	}
	267	}
	268	}
	269	/* Anything else is either an error or a timeout, which is fine:
	270	* we were just going to send another transfer request anyway. */
	271
	272	if (sdi->status == SR_ST_ACTIVE) {
	273	/* Send the same request again. */
	274	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062 UH	275	sr_err("Unable to resubmit transfer: %s.",
fa773062 UH	276	libusb_error_name(ret));
7a360375	277	g_free(transfer->buffer);
9ec7ff94	278	libusb_free_transfer(transfer);
695dc859	279	dev_acquisition_stop(sdi);
7a360375 BV	280	}
	281	} else {
	282	/* This was the last transfer we're going to receive, so
	283	* clean up now. */
7a360375	284	g_free(transfer->buffer);
9ec7ff94	285	libusb_free_transfer(transfer);
7a360375	286	}
7a360375 BV	287	}
	288
	289	static int handle_events(int fd, int revents, void *cb_data)
	290	{
	291	struct dev_context *devc;
4f840ce9	292	struct drv_context *drvc;
7a360375	293	struct sr_dev_inst *sdi;
4f840ce9	294	struct sr_dev_driver *di;
7a360375 BV	295	struct timeval tv;
7a360375 BV	296	gint64 now;
7a360375 BV	297
	298	(void)fd;
	299	(void)revents;
	300
	301	sdi = cb_data;
	302	devc = sdi->priv;
4f840ce9	303	di = sdi->driver;
41812aca	304	drvc = di->context;
7a360375 BV	305
	306	if (devc->limit_msec) {
	307	now = g_get_monotonic_time() / 1000;
	308	if (now > devc->end_time)
695dc859	309	dev_acquisition_stop(sdi);
7a360375 BV	310	}
	311
	312	if (sdi->status == SR_ST_STOPPING) {
102f1239	313	usb_source_remove(sdi->session, drvc->sr_ctx);
6078d2c9	314	dev_close(sdi);
3be42bc2	315	std_session_send_df_end(sdi, LOG_PREFIX);
7a360375 BV	316	}
	317
	318	memset(&tv, 0, sizeof(struct timeval));
d4abb463 PS	319	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
d4abb463 PS	320	NULL);
7a360375 BV	321
	322	return TRUE;
	323	}
	324
695dc859	325	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
ac3898d2	326	{
4f840ce9	327	struct sr_dev_driver *di = sdi->driver;
41812aca	328	struct drv_context *drvc = di->context;
ac046ef8	329	struct sr_usb_dev_inst *usb;
7a360375	330	struct libusb_transfer *transfer;
6c60facc	331	int ret;
7a360375 BV	332	unsigned char *buf;
7a360375 BV	333
e73ffd42 BV	334	if (sdi->status != SR_ST_ACTIVE)
	335	return SR_ERR_DEV_CLOSED;
	336
ac046ef8	337	usb = sdi->conn;
7a360375	338
695dc859	339	std_session_send_df_header(sdi, LOG_PREFIX);
7a360375	340
102f1239 BV	341	usb_source_add(sdi->session, drvc->sr_ctx, 100,
102f1239 BV	342	handle_events, (void *)sdi);
7a360375	343
a95f142e	344	buf = g_malloc(DMM_DATA_SIZE);
7a360375 BV	345	transfer = libusb_alloc_transfer(0);
	346	/* Each transfer request gets 100ms to arrive before it's restarted.
	347	* The device only sends 1 transfer/second no matter how many
	348	* times you ask, but we want to keep step with the USB events
	349	* handling above. */
ac046ef8	350	libusb_fill_interrupt_transfer(transfer, usb->devhdl,
fa773062	351	VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
695dc859	352	(struct sr_dev_inst *)sdi, 100);
7a360375	353	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062	354	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
7a360375 BV	355	libusb_free_transfer(transfer);
	356	g_free(buf);
	357	return SR_ERR;
	358	}
ac3898d2 BV	359
	360	return SR_OK;
	361	}
	362
695dc859	363	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
ac3898d2	364	{
ac3898d2	365	if (sdi->status != SR_ST_ACTIVE) {
7a360375	366	sr_err("Device not active, can't stop acquisition.");
ac3898d2 BV	367	return SR_ERR;
	368	}
	369
7a360375	370	sdi->status = SR_ST_STOPPING;
ac3898d2 BV	371
	372	return SR_OK;
	373	}
	374
	375	SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	376	.name = "victor-dmm",
7a360375	377	.longname = "Victor DMMs",
ac3898d2	378	.api_version = 1,
6078d2c9	379	.init = init,
700d6b64	380	.cleanup = std_cleanup,
6078d2c9	381	.scan = scan,
c01bf34c	382	.dev_list = std_dev_list,
a6630742	383	.dev_clear = NULL,
ac046ef8	384	.config_get = config_get,
035a1078	385	.config_set = config_set,
a1c743fc	386	.config_list = config_list,
6078d2c9 UH	387	.dev_open = dev_open,
	388	.dev_close = dev_close,
	389	.dev_acquisition_start = dev_acquisition_start,
	390	.dev_acquisition_stop = dev_acquisition_stop,
41812aca	391	.context = NULL,
ac3898d2	392	};