[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 int32_t hwopts[] = {
	SR_CONF_CONN,
};

static const int32_t hwcaps[] = {
	SR_CONF_MULTIMETER,
	SR_CONF_LIMIT_MSEC,
	SR_CONF_LIMIT_SAMPLES,
	SR_CONF_CONTINUOUS,
};

/* 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(sdi->conn);
		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)
{
	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
}

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;

	drvc = di->priv;

	/* 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 (!(sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
				libusb_get_device_address(devlist[i]), NULL)))
			return 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 GSList *hw_dev_list(void)
{
	return ((struct drv_context *)(di->priv))->instances;
}

static int hw_dev_open(struct sr_dev_inst *sdi)
{
	struct drv_context *drvc = di->priv;
	struct sr_usb_dev_inst *usb;
	libusb_device **devlist;
	int ret, i;

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

	usb = sdi->conn;

	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	for (i = 0; devlist[i]; i++) {
		if (libusb_get_bus_number(devlist[i]) != usb->bus
				|| libusb_get_device_address(devlist[i]) != usb->address)
			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 hw_dev_close(struct sr_dev_inst *sdi)
{
	struct sr_usb_dev_inst *usb;

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

	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 hw_cleanup(void)
{
	struct drv_context *drvc;

	if (!(drvc = di->priv))
		/* Can get called on an unused driver, doesn't matter. */
		return SR_OK;

	clear_instances();
	g_free(drvc);
	di->priv = NULL;

	return SR_OK;
}

static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
{
	struct sr_usb_dev_inst *usb;
	char str[128];

	switch (id) {
	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(int id, GVariant *data, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	gint64 now;
	int ret;

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

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

	devc = sdi->priv;
	ret = SR_OK;
	switch (id) {
	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;
		sr_dbg("Setting time limit to %" PRIu64 "ms.",
		       devc->limit_msec);
		break;
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		sr_dbg("Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	default:
		ret = SR_ERR_NA;
	}

	return ret;
}

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

	(void)sdi;

	switch (key) {
	case SR_CONF_SCAN_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
		break;
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static void receive_transfer(struct libusb_transfer *transfer)
{
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	int ret;

	sdi = transfer->user_data;
	devc = sdi->priv;
	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
		/* USB device was unplugged. */
		hw_dev_acquisition_stop(sdi, sdi);
	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
		sr_dbg("Got %d-byte packet.", transfer->actual_length);
		if (transfer->actual_length == DMM_DATA_SIZE) {
			victor_dmm_receive_data(sdi, transfer->buffer);
			if (devc->limit_samples) {
				if (devc->num_samples >= devc->limit_samples)
					hw_dev_acquisition_stop(sdi, sdi);
			}
		}
	}
	/* Anything else is either an error or a timeout, which is fine:
	 * we were just going to send another transfer request anyway. */

	if (sdi->status == SR_ST_ACTIVE) {
		/* Send the same request again. */
		if ((ret = libusb_submit_transfer(transfer) != 0)) {
			sr_err("Unable to resubmit transfer: %s.",
			       libusb_error_name(ret));
			g_free(transfer->buffer);
			libusb_free_transfer(transfer);
			hw_dev_acquisition_stop(sdi, sdi);
		}
	} else {
		/* This was the last transfer we're going to receive, so
		 * clean up now. */
		g_free(transfer->buffer);
		libusb_free_transfer(transfer);
	}
}

static int handle_events(int fd, int revents, void *cb_data)
{
	struct dev_context *devc;
	struct drv_context *drvc = di->priv;
	struct sr_datafeed_packet packet;
	struct sr_dev_inst *sdi;
	struct timeval tv;
	gint64 now;
	int i;

	(void)fd;
	(void)revents;

	sdi = cb_data;
	devc = sdi->priv;

	if (devc->limit_msec) {
		now = g_get_monotonic_time() / 1000;
		if (now > devc->end_time)
			hw_dev_acquisition_stop(sdi, sdi);
	}

	if (sdi->status == SR_ST_STOPPING) {
		for (i = 0; devc->usbfd[i] != -1; i++)
			sr_source_remove(devc->usbfd[i]);

		hw_dev_close(sdi);

		packet.type = SR_DF_END;
		sr_session_send(cb_data, &packet);
	}

	memset(&tv, 0, sizeof(struct timeval));
	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
					       NULL);

	return TRUE;
}

static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
				    void *cb_data)
{
	struct dev_context *devc;
	struct drv_context *drvc = di->priv;
	const struct libusb_pollfd **pfd;
	struct sr_usb_dev_inst *usb;
	struct libusb_transfer *transfer;
	int ret, i;
	unsigned char *buf;

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

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

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

	/* Send header packet to the session bus. */
	std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);

	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, usb->devhdl,
			VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
			cb_data, 100);
	if ((ret = libusb_submit_transfer(transfer) != 0)) {
		sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
		libusb_free_transfer(transfer);
		g_free(buf);
		return SR_ERR;
	}

	return SR_OK;
}

static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
	(void)cb_data;

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

	if (sdi->status != SR_ST_ACTIVE) {
		sr_err("Device not active, can't stop acquisition.");
		return SR_ERR;
	}

	sdi->status = SR_ST_STOPPING;

	return SR_OK;
}

SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	.name = "victor-dmm",
	.longname = "Victor DMMs",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.scan = hw_scan,
	.dev_list = hw_dev_list,
	.dev_clear = clear_instances,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.dev_acquisition_start = hw_dev_acquisition_start,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
	.priv = NULL,
};
Commit	Line	Data
ac3898d2 BV	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
	5	*
	6	* This program is free software: you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation, either version 3 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <glib.h>
7a360375 BV	21	#include <libusb.h>
	22	#include <stdlib.h>
	23	#include <string.h>
fa773062 UH	24	#include "libsigrok.h"
	25	#include "libsigrok-internal.h"
	26	#include "protocol.h"
7a360375 BV	27
	28	#define VICTOR_VID 0x1244
	29	#define VICTOR_PID 0xd237
	30	#define VICTOR_VENDOR "Victor"
	31	#define VICTOR_INTERFACE 0
	32	#define VICTOR_ENDPOINT LIBUSB_ENDPOINT_IN \| 1
ac3898d2 BV	33
	34	SR_PRIV struct sr_dev_driver victor_dmm_driver_info;
	35	static struct sr_dev_driver *di = &victor_dmm_driver_info;
7a360375 BV	36	static int hw_dev_close(struct sr_dev_inst *sdi);
	37	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data);
	38
ac046ef8 BV	39	static const int32_t hwopts[] = {
	40	SR_CONF_CONN,
	41	};
	42
a59b4eef	43	static const int32_t hwcaps[] = {
1953564a BV	44	SR_CONF_MULTIMETER,
	45	SR_CONF_LIMIT_MSEC,
	46	SR_CONF_LIMIT_SAMPLES,
	47	SR_CONF_CONTINUOUS,
7a360375 BV	48	};
7a360375 BV	49
ac3898d2 BV	50	/* Properly close and free all devices. */
	51	static int clear_instances(void)
	52	{
	53	struct sr_dev_inst *sdi;
	54	struct drv_context *drvc;
	55	struct dev_context *devc;
	56	GSList *l;
	57
7a360375 BV	58	if (!(drvc = di->priv))
	59	/* Can get called on an unused driver, doesn't matter. */
	60	return SR_OK;
	61
ac3898d2 BV	62	for (l = drvc->instances; l; l = l->next) {
	63	if (!(sdi = l->data))
	64	continue;
	65	if (!(devc = sdi->priv))
	66	continue;
7a360375	67	hw_dev_close(sdi);
ac046ef8	68	sr_usb_dev_inst_free(sdi->conn);
ac3898d2 BV	69	sr_dev_inst_free(sdi);
	70	}
	71
	72	g_slist_free(drvc->instances);
	73	drvc->instances = NULL;
	74
	75	return SR_OK;
	76	}
	77
34f06b90	78	static int hw_init(struct sr_context *sr_ctx)
ac3898d2	79	{
063e7aef	80	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
ac3898d2 BV	81	}
	82
	83	static GSList hw_scan(GSList options)
	84	{
	85	struct drv_context *drvc;
7a360375 BV	86	struct dev_context *devc;
	87	struct sr_dev_inst *sdi;
	88	struct sr_probe *probe;
	89	struct libusb_device_descriptor des;
	90	libusb_device **devlist;
ac3898d2	91	GSList *devices;
7a360375	92	int ret, devcnt, i;
ac3898d2 BV	93
	94	(void)options;
	95
4b97c74e	96	drvc = di->priv;
7a360375 BV	97
	98	/* USB scan is always authoritative. */
	99	clear_instances();
	100
ac3898d2	101	devices = NULL;
d4abb463	102	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375 BV	103	for (i = 0; devlist[i]; i++) {
	104	if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
	105	sr_warn("Failed to get device descriptor: %s",
	106	libusb_error_name(ret));
	107	continue;
	108	}
ac3898d2	109
7a360375 BV	110	if (des.idVendor != VICTOR_VID \|\| des.idProduct != VICTOR_PID)
	111	continue;
	112
	113	devcnt = g_slist_length(drvc->instances);
fa773062 UH	114	if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
fa773062 UH	115	VICTOR_VENDOR, NULL, NULL)))
7a360375 BV	116	return NULL;
	117	sdi->driver = di;
	118
	119	if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
	120	return NULL;
	121	sdi->priv = devc;
	122
	123	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	124	return NULL;
	125	sdi->probes = g_slist_append(NULL, probe);
	126
ac046ef8	127	if (!(sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
7a360375 BV	128	libusb_get_device_address(devlist[i]), NULL)))
7a360375 BV	129	return NULL;
ac046ef8	130	sdi->inst_type = SR_INST_USB;
7a360375 BV	131
	132	drvc->instances = g_slist_append(drvc->instances, sdi);
	133	devices = g_slist_append(devices, sdi);
	134	}
	135	libusb_free_device_list(devlist, 1);
ac3898d2 BV	136
	137	return devices;
	138	}
	139
	140	static GSList *hw_dev_list(void)
	141	{
0e94d524	142	return ((struct drv_context *)(di->priv))->instances;
ac3898d2 BV	143	}
	144
	145	static int hw_dev_open(struct sr_dev_inst *sdi)
	146	{
d4abb463	147	struct drv_context *drvc = di->priv;
ac046ef8	148	struct sr_usb_dev_inst *usb;
7a360375 BV	149	libusb_device **devlist;
	150	int ret, i;
	151
	152	if (!di->priv) {
	153	sr_err("Driver was not initialized.");
	154	return SR_ERR;
	155	}
	156
ac046ef8 BV	157	usb = sdi->conn;
ac046ef8 BV	158
d4abb463	159	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375	160	for (i = 0; devlist[i]; i++) {
ac046ef8 BV	161	if (libusb_get_bus_number(devlist[i]) != usb->bus
ac046ef8 BV	162	\|\| libusb_get_device_address(devlist[i]) != usb->address)
7a360375	163	continue;
ac046ef8	164	if ((ret = libusb_open(devlist[i], &usb->devhdl))) {
fa773062	165	sr_err("Failed to open device: %s.", libusb_error_name(ret));
7a360375 BV	166	return SR_ERR;
	167	}
	168	break;
	169	}
	170	libusb_free_device_list(devlist, 1);
	171	if (!devlist[i]) {
	172	sr_err("Device not found.");
	173	return SR_ERR;
	174	}
	175
	176	/* The device reports as HID class, so the kernel would have
	177	* claimed it. */
ac046ef8 BV	178	if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
ac046ef8 BV	179	if ((ret = libusb_detach_kernel_driver(usb->devhdl, 0)) < 0) {
d4928d71 PS	180	sr_err("Failed to detach kernel driver: %s.",
d4928d71 PS	181	libusb_error_name(ret));
7a360375 BV	182	return SR_ERR;
	183	}
	184	}
	185
ac046ef8	186	if ((ret = libusb_claim_interface(usb->devhdl,
7a360375	187	VICTOR_INTERFACE))) {
fa773062	188	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
7a360375 BV	189	return SR_ERR;
	190	}
	191	sdi->status = SR_ST_ACTIVE;
ac3898d2 BV	192
	193	return SR_OK;
	194	}
	195
	196	static int hw_dev_close(struct sr_dev_inst *sdi)
	197	{
ac046ef8	198	struct sr_usb_dev_inst *usb;
7a360375 BV	199
	200	if (!di->priv) {
	201	sr_err("Driver was not initialized.");
	202	return SR_ERR;
	203	}
	204
ac046ef8 BV	205	usb = sdi->conn;
	206
	207	if (!usb->devhdl)
7a360375 BV	208	/* Nothing to do. */
	209	return SR_OK;
	210
ac046ef8 BV	211	libusb_release_interface(usb->devhdl, VICTOR_INTERFACE);
	212	libusb_close(usb->devhdl);
	213	usb->devhdl = NULL;
7a360375	214	sdi->status = SR_ST_INACTIVE;
ac3898d2 BV	215
	216	return SR_OK;
	217	}
	218
	219	static int hw_cleanup(void)
	220	{
7a360375 BV	221	struct drv_context *drvc;
	222
	223	if (!(drvc = di->priv))
	224	/* Can get called on an unused driver, doesn't matter. */
	225	return SR_OK;
ac3898d2	226
7a360375 BV	227	clear_instances();
	228	g_free(drvc);
	229	di->priv = NULL;
ac3898d2 BV	230
	231	return SR_OK;
	232	}
	233
ac046ef8 BV	234	static int config_get(int id, GVariant *data, const struct sr_dev_inst sdi)
	235	{
	236	struct sr_usb_dev_inst *usb;
	237	char str[128];
	238
	239	switch (id) {
	240	case SR_CONF_CONN:
	241	if (!sdi \|\| !sdi->conn)
	242	return SR_ERR_ARG;
	243	usb = sdi->conn;
	244	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	245	*data = g_variant_new_string(str);
	246	break;
	247	default:
	248	return SR_ERR_NA;
	249	}
	250
	251	return SR_OK;
	252	}
	253
a59b4eef	254	static int config_set(int id, GVariant data, const struct sr_dev_inst sdi)
ac3898d2	255	{
7a360375 BV	256	struct dev_context *devc;
7a360375 BV	257	gint64 now;
ac3898d2 BV	258	int ret;
ac3898d2 BV	259
e73ffd42 BV	260	if (sdi->status != SR_ST_ACTIVE)
	261	return SR_ERR_DEV_CLOSED;
	262
7a360375 BV	263	if (!di->priv) {
	264	sr_err("Driver was not initialized.");
	265	return SR_ERR;
	266	}
	267
7a360375	268	devc = sdi->priv;
ac3898d2	269	ret = SR_OK;
035a1078	270	switch (id) {
1953564a	271	case SR_CONF_LIMIT_MSEC:
a59b4eef	272	devc->limit_msec = g_variant_get_uint64(data);
fa773062 UH	273	now = g_get_monotonic_time() / 1000;
	274	devc->end_time = now + devc->limit_msec;
	275	sr_dbg("Setting time limit to %" PRIu64 "ms.",
	276	devc->limit_msec);
	277	break;
1953564a	278	case SR_CONF_LIMIT_SAMPLES:
a59b4eef	279	devc->limit_samples = g_variant_get_uint64(data);
fa773062 UH	280	sr_dbg("Setting sample limit to %" PRIu64 ".",
	281	devc->limit_samples);
	282	break;
ac3898d2	283	default:
bd6fbf62	284	ret = SR_ERR_NA;
ac3898d2 BV	285	}
	286
	287	return ret;
	288	}
	289
a59b4eef	290	static int config_list(int key, GVariant *data, const struct sr_dev_inst sdi)
a1c743fc BV	291	{
	292
	293	(void)sdi;
	294
	295	switch (key) {
ac046ef8 BV	296	case SR_CONF_SCAN_OPTIONS:
	297	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	298	hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
	299	break;
9a6517d1	300	case SR_CONF_DEVICE_OPTIONS:
a59b4eef BV	301	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
a59b4eef BV	302	hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
9a6517d1	303	break;
a1c743fc	304	default:
bd6fbf62	305	return SR_ERR_NA;
a1c743fc BV	306	}
	307
	308	return SR_OK;
	309	}
	310
7a360375 BV	311	static void receive_transfer(struct libusb_transfer *transfer)
	312	{
	313	struct dev_context *devc;
	314	struct sr_dev_inst *sdi;
	315	int ret;
	316
	317	sdi = transfer->user_data;
	318	devc = sdi->priv;
	319	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	320	/* USB device was unplugged. */
	321	hw_dev_acquisition_stop(sdi, sdi);
	322	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
fa773062	323	sr_dbg("Got %d-byte packet.", transfer->actual_length);
ff945683 BV	324	if (transfer->actual_length == DMM_DATA_SIZE) {
ff945683 BV	325	victor_dmm_receive_data(sdi, transfer->buffer);
7a360375 BV	326	if (devc->limit_samples) {
	327	if (devc->num_samples >= devc->limit_samples)
	328	hw_dev_acquisition_stop(sdi, sdi);
	329	}
	330	}
	331	}
	332	/* Anything else is either an error or a timeout, which is fine:
	333	* we were just going to send another transfer request anyway. */
	334
	335	if (sdi->status == SR_ST_ACTIVE) {
	336	/* Send the same request again. */
	337	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062 UH	338	sr_err("Unable to resubmit transfer: %s.",
fa773062 UH	339	libusb_error_name(ret));
7a360375	340	g_free(transfer->buffer);
9ec7ff94	341	libusb_free_transfer(transfer);
7a360375 BV	342	hw_dev_acquisition_stop(sdi, sdi);
	343	}
	344	} else {
	345	/* This was the last transfer we're going to receive, so
	346	* clean up now. */
7a360375	347	g_free(transfer->buffer);
9ec7ff94	348	libusb_free_transfer(transfer);
7a360375	349	}
7a360375 BV	350	}
	351
	352	static int handle_events(int fd, int revents, void *cb_data)
	353	{
	354	struct dev_context *devc;
d4abb463	355	struct drv_context *drvc = di->priv;
7a360375 BV	356	struct sr_datafeed_packet packet;
	357	struct sr_dev_inst *sdi;
	358	struct timeval tv;
	359	gint64 now;
	360	int i;
	361
	362	(void)fd;
	363	(void)revents;
	364
	365	sdi = cb_data;
	366	devc = sdi->priv;
	367
	368	if (devc->limit_msec) {
	369	now = g_get_monotonic_time() / 1000;
	370	if (now > devc->end_time)
	371	hw_dev_acquisition_stop(sdi, sdi);
	372	}
	373
	374	if (sdi->status == SR_ST_STOPPING) {
	375	for (i = 0; devc->usbfd[i] != -1; i++)
	376	sr_source_remove(devc->usbfd[i]);
	377
	378	hw_dev_close(sdi);
	379
	380	packet.type = SR_DF_END;
	381	sr_session_send(cb_data, &packet);
	382	}
	383
	384	memset(&tv, 0, sizeof(struct timeval));
d4abb463 PS	385	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
d4abb463 PS	386	NULL);
7a360375 BV	387
	388	return TRUE;
	389	}
	390
ac3898d2 BV	391	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	392	void *cb_data)
	393	{
7a360375	394	struct dev_context *devc;
d4abb463	395	struct drv_context *drvc = di->priv;
7a360375	396	const struct libusb_pollfd **pfd;
ac046ef8	397	struct sr_usb_dev_inst *usb;
7a360375 BV	398	struct libusb_transfer *transfer;
	399	int ret, i;
	400	unsigned char *buf;
	401
e73ffd42 BV	402	if (sdi->status != SR_ST_ACTIVE)
	403	return SR_ERR_DEV_CLOSED;
	404
7a360375 BV	405	if (!di->priv) {
	406	sr_err("Driver was not initialized.");
	407	return SR_ERR;
	408	}
	409
7a360375	410	devc = sdi->priv;
ac046ef8	411	usb = sdi->conn;
7a360375 BV	412	devc->cb_data = cb_data;
	413
	414	/* Send header packet to the session bus. */
4afdfd46	415	std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
7a360375	416
d4abb463	417	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
7a360375 BV	418	for (i = 0; pfd[i]; i++) {
	419	/* Handle USB events every 100ms, for decent latency. */
	420	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	421	handle_events, (void *)sdi);
	422	/* We'll need to remove this fd later. */
	423	devc->usbfd[i] = pfd[i]->fd;
	424	}
	425	devc->usbfd[i] = -1;
	426
ff945683	427	buf = g_try_malloc(DMM_DATA_SIZE);
7a360375 BV	428	transfer = libusb_alloc_transfer(0);
	429	/* Each transfer request gets 100ms to arrive before it's restarted.
	430	* The device only sends 1 transfer/second no matter how many
	431	* times you ask, but we want to keep step with the USB events
	432	* handling above. */
ac046ef8	433	libusb_fill_interrupt_transfer(transfer, usb->devhdl,
fa773062 UH	434	VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
fa773062 UH	435	cb_data, 100);
7a360375	436	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062	437	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
7a360375 BV	438	libusb_free_transfer(transfer);
	439	g_free(buf);
	440	return SR_ERR;
	441	}
ac3898d2 BV	442
	443	return SR_OK;
	444	}
	445
7a360375	446	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
ac3898d2 BV	447	{
	448	(void)cb_data;
	449
7a360375 BV	450	if (!di->priv) {
	451	sr_err("Driver was not initialized.");
	452	return SR_ERR;
	453	}
	454
ac3898d2	455	if (sdi->status != SR_ST_ACTIVE) {
7a360375	456	sr_err("Device not active, can't stop acquisition.");
ac3898d2 BV	457	return SR_ERR;
	458	}
	459
7a360375	460	sdi->status = SR_ST_STOPPING;
ac3898d2 BV	461
	462	return SR_OK;
	463	}
	464
	465	SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	466	.name = "victor-dmm",
7a360375	467	.longname = "Victor DMMs",
ac3898d2 BV	468	.api_version = 1,
	469	.init = hw_init,
	470	.cleanup = hw_cleanup,
	471	.scan = hw_scan,
	472	.dev_list = hw_dev_list,
	473	.dev_clear = clear_instances,
ac046ef8	474	.config_get = config_get,
035a1078	475	.config_set = config_set,
a1c743fc	476	.config_list = config_list,
ac3898d2 BV	477	.dev_open = hw_dev_open,
ac3898d2 BV	478	.dev_close = hw_dev_close,
ac3898d2 BV	479	.dev_acquisition_start = hw_dev_acquisition_start,
	480	.dev_acquisition_stop = hw_dev_acquisition_stop,
	481	.priv = NULL,
	482	};