[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 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,
};

static int clear_instances(void)
{
	return std_dev_clear(di, NULL);
}

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

static GSList *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;

	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 *dev_list(void)
{
	return ((struct drv_context *)(di->priv))->instances;
}

static int 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 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 cleanup(void)
{
	int ret;
	struct drv_context *drvc;

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

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

	return ret;
}

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. */
		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)
					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);
			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)
			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]);

		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 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, LOG_PREFIX);

	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 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 = init,
	.cleanup = cleanup,
	.scan = scan,
	.dev_list = dev_list,
	.dev_clear = clear_instances,
	.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,
	.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;
6078d2c9	36	static int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data);
7a360375	37
ac046ef8 BV	38	static const int32_t hwopts[] = {
	39	SR_CONF_CONN,
	40	};
	41
a59b4eef	42	static const int32_t hwcaps[] = {
1953564a BV	43	SR_CONF_MULTIMETER,
	44	SR_CONF_LIMIT_MSEC,
	45	SR_CONF_LIMIT_SAMPLES,
	46	SR_CONF_CONTINUOUS,
7a360375 BV	47	};
7a360375 BV	48
ac3898d2 BV	49	static int clear_instances(void)
ac3898d2 BV	50	{
8d18d266	51	return std_dev_clear(di, NULL);
ac3898d2 BV	52	}
ac3898d2 BV	53
6078d2c9	54	static int init(struct sr_context *sr_ctx)
ac3898d2	55	{
f6beaac5	56	return std_init(sr_ctx, di, LOG_PREFIX);
ac3898d2 BV	57	}
ac3898d2 BV	58
6078d2c9	59	static GSList scan(GSList options)
ac3898d2 BV	60	{
ac3898d2 BV	61	struct drv_context *drvc;
7a360375 BV	62	struct dev_context *devc;
	63	struct sr_dev_inst *sdi;
	64	struct sr_probe *probe;
	65	struct libusb_device_descriptor des;
	66	libusb_device **devlist;
ac3898d2	67	GSList *devices;
7a360375	68	int ret, devcnt, i;
ac3898d2 BV	69
	70	(void)options;
	71
4b97c74e	72	drvc = di->priv;
7a360375	73
ac3898d2	74	devices = NULL;
d4abb463	75	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375 BV	76	for (i = 0; devlist[i]; i++) {
	77	if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
	78	sr_warn("Failed to get device descriptor: %s",
	79	libusb_error_name(ret));
	80	continue;
	81	}
ac3898d2	82
7a360375 BV	83	if (des.idVendor != VICTOR_VID \|\| des.idProduct != VICTOR_PID)
	84	continue;
	85
	86	devcnt = g_slist_length(drvc->instances);
fa773062 UH	87	if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
fa773062 UH	88	VICTOR_VENDOR, NULL, NULL)))
7a360375 BV	89	return NULL;
	90	sdi->driver = di;
	91
	92	if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
	93	return NULL;
	94	sdi->priv = devc;
	95
	96	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	97	return NULL;
	98	sdi->probes = g_slist_append(NULL, probe);
	99
ac046ef8	100	if (!(sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
7a360375 BV	101	libusb_get_device_address(devlist[i]), NULL)))
7a360375 BV	102	return NULL;
ac046ef8	103	sdi->inst_type = SR_INST_USB;
7a360375 BV	104
	105	drvc->instances = g_slist_append(drvc->instances, sdi);
	106	devices = g_slist_append(devices, sdi);
	107	}
	108	libusb_free_device_list(devlist, 1);
ac3898d2 BV	109
	110	return devices;
	111	}
	112
6078d2c9	113	static GSList *dev_list(void)
ac3898d2	114	{
0e94d524	115	return ((struct drv_context *)(di->priv))->instances;
ac3898d2 BV	116	}
ac3898d2 BV	117
6078d2c9	118	static int dev_open(struct sr_dev_inst *sdi)
ac3898d2	119	{
d4abb463	120	struct drv_context *drvc = di->priv;
ac046ef8	121	struct sr_usb_dev_inst *usb;
7a360375 BV	122	libusb_device **devlist;
	123	int ret, i;
	124
	125	if (!di->priv) {
	126	sr_err("Driver was not initialized.");
	127	return SR_ERR;
	128	}
	129
ac046ef8 BV	130	usb = sdi->conn;
ac046ef8 BV	131
d4abb463	132	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375	133	for (i = 0; devlist[i]; i++) {
ac046ef8 BV	134	if (libusb_get_bus_number(devlist[i]) != usb->bus
ac046ef8 BV	135	\|\| libusb_get_device_address(devlist[i]) != usb->address)
7a360375	136	continue;
ac046ef8	137	if ((ret = libusb_open(devlist[i], &usb->devhdl))) {
fa773062	138	sr_err("Failed to open device: %s.", libusb_error_name(ret));
7a360375 BV	139	return SR_ERR;
	140	}
	141	break;
	142	}
	143	libusb_free_device_list(devlist, 1);
	144	if (!devlist[i]) {
	145	sr_err("Device not found.");
	146	return SR_ERR;
	147	}
	148
	149	/* The device reports as HID class, so the kernel would have
	150	* claimed it. */
ac046ef8 BV	151	if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
ac046ef8 BV	152	if ((ret = libusb_detach_kernel_driver(usb->devhdl, 0)) < 0) {
d4928d71 PS	153	sr_err("Failed to detach kernel driver: %s.",
d4928d71 PS	154	libusb_error_name(ret));
7a360375 BV	155	return SR_ERR;
	156	}
	157	}
	158
ac046ef8	159	if ((ret = libusb_claim_interface(usb->devhdl,
7a360375	160	VICTOR_INTERFACE))) {
fa773062	161	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
7a360375 BV	162	return SR_ERR;
	163	}
	164	sdi->status = SR_ST_ACTIVE;
ac3898d2 BV	165
	166	return SR_OK;
	167	}
	168
6078d2c9	169	static int dev_close(struct sr_dev_inst *sdi)
ac3898d2	170	{
ac046ef8	171	struct sr_usb_dev_inst *usb;
7a360375 BV	172
	173	if (!di->priv) {
	174	sr_err("Driver was not initialized.");
	175	return SR_ERR;
	176	}
	177
ac046ef8 BV	178	usb = sdi->conn;
	179
	180	if (!usb->devhdl)
7a360375 BV	181	/* Nothing to do. */
	182	return SR_OK;
	183
ac046ef8 BV	184	libusb_release_interface(usb->devhdl, VICTOR_INTERFACE);
	185	libusb_close(usb->devhdl);
	186	usb->devhdl = NULL;
7a360375	187	sdi->status = SR_ST_INACTIVE;
ac3898d2 BV	188
	189	return SR_OK;
	190	}
	191
6078d2c9	192	static int cleanup(void)
ac3898d2	193	{
8d18d266	194	int ret;
7a360375 BV	195	struct drv_context *drvc;
	196
	197	if (!(drvc = di->priv))
	198	/* Can get called on an unused driver, doesn't matter. */
	199	return SR_OK;
ac3898d2	200
8d18d266	201	ret = clear_instances();
7a360375 BV	202	g_free(drvc);
7a360375 BV	203	di->priv = NULL;
ac3898d2	204
8d18d266	205	return ret;
ac3898d2 BV	206	}
ac3898d2 BV	207
ac046ef8 BV	208	static int config_get(int id, GVariant *data, const struct sr_dev_inst sdi)
	209	{
	210	struct sr_usb_dev_inst *usb;
	211	char str[128];
	212
	213	switch (id) {
	214	case SR_CONF_CONN:
	215	if (!sdi \|\| !sdi->conn)
	216	return SR_ERR_ARG;
	217	usb = sdi->conn;
	218	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	219	*data = g_variant_new_string(str);
	220	break;
	221	default:
	222	return SR_ERR_NA;
	223	}
	224
	225	return SR_OK;
	226	}
	227
a59b4eef	228	static int config_set(int id, GVariant data, const struct sr_dev_inst sdi)
ac3898d2	229	{
7a360375 BV	230	struct dev_context *devc;
7a360375 BV	231	gint64 now;
ac3898d2 BV	232	int ret;
ac3898d2 BV	233
e73ffd42 BV	234	if (sdi->status != SR_ST_ACTIVE)
	235	return SR_ERR_DEV_CLOSED;
	236
7a360375 BV	237	if (!di->priv) {
	238	sr_err("Driver was not initialized.");
	239	return SR_ERR;
	240	}
	241
7a360375	242	devc = sdi->priv;
ac3898d2	243	ret = SR_OK;
035a1078	244	switch (id) {
1953564a	245	case SR_CONF_LIMIT_MSEC:
a59b4eef	246	devc->limit_msec = g_variant_get_uint64(data);
fa773062 UH	247	now = g_get_monotonic_time() / 1000;
	248	devc->end_time = now + devc->limit_msec;
	249	sr_dbg("Setting time limit to %" PRIu64 "ms.",
	250	devc->limit_msec);
	251	break;
1953564a	252	case SR_CONF_LIMIT_SAMPLES:
a59b4eef	253	devc->limit_samples = g_variant_get_uint64(data);
fa773062 UH	254	sr_dbg("Setting sample limit to %" PRIu64 ".",
	255	devc->limit_samples);
	256	break;
ac3898d2	257	default:
bd6fbf62	258	ret = SR_ERR_NA;
ac3898d2 BV	259	}
	260
	261	return ret;
	262	}
	263
a59b4eef	264	static int config_list(int key, GVariant *data, const struct sr_dev_inst sdi)
a1c743fc BV	265	{
	266
	267	(void)sdi;
	268
	269	switch (key) {
ac046ef8 BV	270	case SR_CONF_SCAN_OPTIONS:
	271	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	272	hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
	273	break;
9a6517d1	274	case SR_CONF_DEVICE_OPTIONS:
a59b4eef BV	275	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
a59b4eef BV	276	hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
9a6517d1	277	break;
a1c743fc	278	default:
bd6fbf62	279	return SR_ERR_NA;
a1c743fc BV	280	}
	281
	282	return SR_OK;
	283	}
	284
7a360375 BV	285	static void receive_transfer(struct libusb_transfer *transfer)
	286	{
	287	struct dev_context *devc;
	288	struct sr_dev_inst *sdi;
	289	int ret;
	290
	291	sdi = transfer->user_data;
	292	devc = sdi->priv;
	293	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	294	/* USB device was unplugged. */
6078d2c9	295	dev_acquisition_stop(sdi, sdi);
7a360375	296	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
fa773062	297	sr_dbg("Got %d-byte packet.", transfer->actual_length);
ff945683 BV	298	if (transfer->actual_length == DMM_DATA_SIZE) {
ff945683 BV	299	victor_dmm_receive_data(sdi, transfer->buffer);
7a360375 BV	300	if (devc->limit_samples) {
7a360375 BV	301	if (devc->num_samples >= devc->limit_samples)
6078d2c9	302	dev_acquisition_stop(sdi, sdi);
7a360375 BV	303	}
	304	}
	305	}
	306	/* Anything else is either an error or a timeout, which is fine:
	307	* we were just going to send another transfer request anyway. */
	308
	309	if (sdi->status == SR_ST_ACTIVE) {
	310	/* Send the same request again. */
	311	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062 UH	312	sr_err("Unable to resubmit transfer: %s.",
fa773062 UH	313	libusb_error_name(ret));
7a360375	314	g_free(transfer->buffer);
9ec7ff94	315	libusb_free_transfer(transfer);
6078d2c9	316	dev_acquisition_stop(sdi, sdi);
7a360375 BV	317	}
	318	} else {
	319	/* This was the last transfer we're going to receive, so
	320	* clean up now. */
7a360375	321	g_free(transfer->buffer);
9ec7ff94	322	libusb_free_transfer(transfer);
7a360375	323	}
7a360375 BV	324	}
	325
	326	static int handle_events(int fd, int revents, void *cb_data)
	327	{
	328	struct dev_context *devc;
d4abb463	329	struct drv_context *drvc = di->priv;
7a360375 BV	330	struct sr_datafeed_packet packet;
	331	struct sr_dev_inst *sdi;
	332	struct timeval tv;
	333	gint64 now;
	334	int i;
	335
	336	(void)fd;
	337	(void)revents;
	338
	339	sdi = cb_data;
	340	devc = sdi->priv;
	341
	342	if (devc->limit_msec) {
	343	now = g_get_monotonic_time() / 1000;
	344	if (now > devc->end_time)
6078d2c9	345	dev_acquisition_stop(sdi, sdi);
7a360375 BV	346	}
	347
	348	if (sdi->status == SR_ST_STOPPING) {
	349	for (i = 0; devc->usbfd[i] != -1; i++)
	350	sr_source_remove(devc->usbfd[i]);
	351
6078d2c9	352	dev_close(sdi);
7a360375 BV	353
	354	packet.type = SR_DF_END;
	355	sr_session_send(cb_data, &packet);
	356	}
	357
	358	memset(&tv, 0, sizeof(struct timeval));
d4abb463 PS	359	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
d4abb463 PS	360	NULL);
7a360375 BV	361
	362	return TRUE;
	363	}
	364
6078d2c9	365	static int dev_acquisition_start(const struct sr_dev_inst sdi, void cb_data)
ac3898d2	366	{
7a360375	367	struct dev_context *devc;
d4abb463	368	struct drv_context *drvc = di->priv;
7a360375	369	const struct libusb_pollfd **pfd;
ac046ef8	370	struct sr_usb_dev_inst *usb;
7a360375 BV	371	struct libusb_transfer *transfer;
	372	int ret, i;
	373	unsigned char *buf;
	374
e73ffd42 BV	375	if (sdi->status != SR_ST_ACTIVE)
	376	return SR_ERR_DEV_CLOSED;
	377
7a360375 BV	378	if (!di->priv) {
	379	sr_err("Driver was not initialized.");
	380	return SR_ERR;
	381	}
	382
7a360375	383	devc = sdi->priv;
ac046ef8	384	usb = sdi->conn;
7a360375 BV	385	devc->cb_data = cb_data;
	386
	387	/* Send header packet to the session bus. */
29a27196	388	std_session_send_df_header(cb_data, LOG_PREFIX);
7a360375	389
d4abb463	390	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
7a360375 BV	391	for (i = 0; pfd[i]; i++) {
	392	/* Handle USB events every 100ms, for decent latency. */
	393	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	394	handle_events, (void *)sdi);
	395	/* We'll need to remove this fd later. */
	396	devc->usbfd[i] = pfd[i]->fd;
	397	}
	398	devc->usbfd[i] = -1;
	399
ff945683	400	buf = g_try_malloc(DMM_DATA_SIZE);
7a360375 BV	401	transfer = libusb_alloc_transfer(0);
	402	/* Each transfer request gets 100ms to arrive before it's restarted.
	403	* The device only sends 1 transfer/second no matter how many
	404	* times you ask, but we want to keep step with the USB events
	405	* handling above. */
ac046ef8	406	libusb_fill_interrupt_transfer(transfer, usb->devhdl,
fa773062 UH	407	VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
fa773062 UH	408	cb_data, 100);
7a360375	409	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062	410	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
7a360375 BV	411	libusb_free_transfer(transfer);
	412	g_free(buf);
	413	return SR_ERR;
	414	}
ac3898d2 BV	415
	416	return SR_OK;
	417	}
	418
6078d2c9	419	static int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
ac3898d2 BV	420	{
	421	(void)cb_data;
	422
7a360375 BV	423	if (!di->priv) {
	424	sr_err("Driver was not initialized.");
	425	return SR_ERR;
	426	}
	427
ac3898d2	428	if (sdi->status != SR_ST_ACTIVE) {
7a360375	429	sr_err("Device not active, can't stop acquisition.");
ac3898d2 BV	430	return SR_ERR;
	431	}
	432
7a360375	433	sdi->status = SR_ST_STOPPING;
ac3898d2 BV	434
	435	return SR_OK;
	436	}
	437
	438	SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	439	.name = "victor-dmm",
7a360375	440	.longname = "Victor DMMs",
ac3898d2	441	.api_version = 1,
6078d2c9 UH	442	.init = init,
	443	.cleanup = cleanup,
	444	.scan = scan,
	445	.dev_list = dev_list,
ac3898d2	446	.dev_clear = clear_instances,
ac046ef8	447	.config_get = config_get,
035a1078	448	.config_set = config_set,
a1c743fc	449	.config_list = config_list,
6078d2c9 UH	450	.dev_open = dev_open,
	451	.dev_close = dev_close,
	452	.dev_acquisition_start = dev_acquisition_start,
	453	.dev_acquisition_stop = dev_acquisition_stop,
ac3898d2 BV	454	.priv = NULL,
ac3898d2 BV	455	};