[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 int hwcaps[] = {
	SR_CONF_MULTIMETER,
	SR_CONF_LIMIT_MSEC,
	SR_CONF_LIMIT_SAMPLES,
	SR_CONF_CONTINUOUS,
	0
};

/* 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(devc->usb);
		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 (!(devc->usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
				libusb_get_device_address(devlist[i]), NULL)))
			return NULL;

		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 dev_context *devc;
	struct drv_context *drvc = di->priv;
	libusb_device **devlist;
	int ret, i;

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

	devc = sdi->priv;
	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	for (i = 0; devlist[i]; i++) {
		if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
				|| libusb_get_device_address(devlist[i]) != devc->usb->address)
			continue;
		if ((ret = libusb_open(devlist[i], &devc->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(devc->usb->devhdl, 0) == 1) {
		if ((ret = libusb_detach_kernel_driver(devc->usb->devhdl, 0)) < 0) {
			sr_err("Failed to detach kernel driver: %s.",
			       libusb_error_name(ret));
			return SR_ERR;
		}
	}

	if ((ret = libusb_claim_interface(devc->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 dev_context *devc;

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

	devc = sdi->priv;
	if (!devc->usb->devhdl)
		/*  Nothing to do. */
		return SR_OK;

	libusb_release_interface(devc->usb->devhdl, VICTOR_INTERFACE);
	libusb_close(devc->usb->devhdl);
	devc->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_set(int id, const void *value, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	gint64 now;
	int ret;

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

	if (sdi->status != SR_ST_ACTIVE) {
		sr_err("Device inactive, can't set config options.");
		return SR_ERR;
	}

	devc = sdi->priv;
	ret = SR_OK;
	switch (id) {
	case SR_CONF_LIMIT_MSEC:
		devc->limit_msec = *(const int64_t *)value;
		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 = *(const uint64_t *)value;
		sr_dbg("Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	default:
		sr_err("Unknown hardware capability: %d.", id);
		ret = SR_ERR_ARG;
	}

	return ret;
}

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

	(void)sdi;

	switch (key) {
	case SR_CONF_DEVICE_OPTIONS:
		*data = hwcaps;
		break;
	default:
		return SR_ERR_ARG;
	}

	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 libusb_transfer *transfer;
	int ret, i;
	unsigned char *buf;

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

	devc = sdi->priv;
	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, devc->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_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
	39	static const int hwcaps[] = {
1953564a BV	40	SR_CONF_MULTIMETER,
	41	SR_CONF_LIMIT_MSEC,
	42	SR_CONF_LIMIT_SAMPLES,
	43	SR_CONF_CONTINUOUS,
7a360375 BV	44	0
	45	};
	46
ac3898d2 BV	47	/* Properly close and free all devices. */
	48	static int clear_instances(void)
	49	{
	50	struct sr_dev_inst *sdi;
	51	struct drv_context *drvc;
	52	struct dev_context *devc;
	53	GSList *l;
	54
7a360375 BV	55	if (!(drvc = di->priv))
	56	/* Can get called on an unused driver, doesn't matter. */
	57	return SR_OK;
	58
ac3898d2 BV	59	for (l = drvc->instances; l; l = l->next) {
	60	if (!(sdi = l->data))
	61	continue;
	62	if (!(devc = sdi->priv))
	63	continue;
7a360375 BV	64	hw_dev_close(sdi);
7a360375 BV	65	sr_usb_dev_inst_free(devc->usb);
ac3898d2 BV	66	sr_dev_inst_free(sdi);
	67	}
	68
	69	g_slist_free(drvc->instances);
	70	drvc->instances = NULL;
	71
	72	return SR_OK;
	73	}
	74
34f06b90	75	static int hw_init(struct sr_context *sr_ctx)
ac3898d2	76	{
063e7aef	77	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
ac3898d2 BV	78	}
	79
	80	static GSList hw_scan(GSList options)
	81	{
	82	struct drv_context *drvc;
7a360375 BV	83	struct dev_context *devc;
	84	struct sr_dev_inst *sdi;
	85	struct sr_probe *probe;
	86	struct libusb_device_descriptor des;
	87	libusb_device **devlist;
ac3898d2	88	GSList *devices;
7a360375	89	int ret, devcnt, i;
ac3898d2 BV	90
	91	(void)options;
	92
4b97c74e	93	drvc = di->priv;
7a360375 BV	94
	95	/* USB scan is always authoritative. */
	96	clear_instances();
	97
ac3898d2	98	devices = NULL;
d4abb463	99	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375 BV	100	for (i = 0; devlist[i]; i++) {
	101	if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
	102	sr_warn("Failed to get device descriptor: %s",
	103	libusb_error_name(ret));
	104	continue;
	105	}
ac3898d2	106
7a360375 BV	107	if (des.idVendor != VICTOR_VID \|\| des.idProduct != VICTOR_PID)
	108	continue;
	109
	110	devcnt = g_slist_length(drvc->instances);
fa773062 UH	111	if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
fa773062 UH	112	VICTOR_VENDOR, NULL, NULL)))
7a360375 BV	113	return NULL;
	114	sdi->driver = di;
	115
	116	if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
	117	return NULL;
	118	sdi->priv = devc;
	119
	120	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	121	return NULL;
	122	sdi->probes = g_slist_append(NULL, probe);
	123
	124	if (!(devc->usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
	125	libusb_get_device_address(devlist[i]), NULL)))
	126	return NULL;
	127
	128	drvc->instances = g_slist_append(drvc->instances, sdi);
	129	devices = g_slist_append(devices, sdi);
	130	}
	131	libusb_free_device_list(devlist, 1);
ac3898d2 BV	132
	133	return devices;
	134	}
	135
	136	static GSList *hw_dev_list(void)
	137	{
0e94d524	138	return ((struct drv_context *)(di->priv))->instances;
ac3898d2 BV	139	}
	140
	141	static int hw_dev_open(struct sr_dev_inst *sdi)
	142	{
7a360375	143	struct dev_context *devc;
d4abb463	144	struct drv_context *drvc = di->priv;
7a360375 BV	145	libusb_device **devlist;
	146	int ret, i;
	147
	148	if (!di->priv) {
	149	sr_err("Driver was not initialized.");
	150	return SR_ERR;
	151	}
	152
	153	devc = sdi->priv;
d4abb463	154	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375 BV	155	for (i = 0; devlist[i]; i++) {
	156	if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
	157	\|\| libusb_get_device_address(devlist[i]) != devc->usb->address)
	158	continue;
	159	if ((ret = libusb_open(devlist[i], &devc->usb->devhdl))) {
fa773062	160	sr_err("Failed to open device: %s.", libusb_error_name(ret));
7a360375 BV	161	return SR_ERR;
	162	}
	163	break;
	164	}
	165	libusb_free_device_list(devlist, 1);
	166	if (!devlist[i]) {
	167	sr_err("Device not found.");
	168	return SR_ERR;
	169	}
	170
	171	/* The device reports as HID class, so the kernel would have
	172	* claimed it. */
	173	if (libusb_kernel_driver_active(devc->usb->devhdl, 0) == 1) {
d4928d71 PS	174	if ((ret = libusb_detach_kernel_driver(devc->usb->devhdl, 0)) < 0) {
	175	sr_err("Failed to detach kernel driver: %s.",
	176	libusb_error_name(ret));
7a360375 BV	177	return SR_ERR;
	178	}
	179	}
	180
	181	if ((ret = libusb_claim_interface(devc->usb->devhdl,
	182	VICTOR_INTERFACE))) {
fa773062	183	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
7a360375 BV	184	return SR_ERR;
	185	}
	186	sdi->status = SR_ST_ACTIVE;
ac3898d2 BV	187
	188	return SR_OK;
	189	}
	190
	191	static int hw_dev_close(struct sr_dev_inst *sdi)
	192	{
7a360375 BV	193	struct dev_context *devc;
	194
	195	if (!di->priv) {
	196	sr_err("Driver was not initialized.");
	197	return SR_ERR;
	198	}
	199
	200	devc = sdi->priv;
	201	if (!devc->usb->devhdl)
	202	/* Nothing to do. */
	203	return SR_OK;
	204
	205	libusb_release_interface(devc->usb->devhdl, VICTOR_INTERFACE);
	206	libusb_close(devc->usb->devhdl);
	207	devc->usb->devhdl = NULL;
	208	sdi->status = SR_ST_INACTIVE;
ac3898d2 BV	209
	210	return SR_OK;
	211	}
	212
	213	static int hw_cleanup(void)
	214	{
7a360375 BV	215	struct drv_context *drvc;
	216
	217	if (!(drvc = di->priv))
	218	/* Can get called on an unused driver, doesn't matter. */
	219	return SR_OK;
ac3898d2	220
7a360375 BV	221	clear_instances();
	222	g_free(drvc);
	223	di->priv = NULL;
ac3898d2 BV	224
	225	return SR_OK;
	226	}
	227
035a1078	228	static int config_set(int id, const void value, 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
7a360375 BV	234	if (!di->priv) {
	235	sr_err("Driver was not initialized.");
	236	return SR_ERR;
	237	}
	238
ac3898d2 BV	239	if (sdi->status != SR_ST_ACTIVE) {
	240	sr_err("Device inactive, can't set config options.");
	241	return SR_ERR;
	242	}
	243
7a360375	244	devc = sdi->priv;
ac3898d2	245	ret = SR_OK;
035a1078	246	switch (id) {
1953564a	247	case SR_CONF_LIMIT_MSEC:
fa773062 UH	248	devc->limit_msec = (const int64_t )value;
	249	now = g_get_monotonic_time() / 1000;
	250	devc->end_time = now + devc->limit_msec;
	251	sr_dbg("Setting time limit to %" PRIu64 "ms.",
	252	devc->limit_msec);
	253	break;
1953564a	254	case SR_CONF_LIMIT_SAMPLES:
fa773062 UH	255	devc->limit_samples = (const uint64_t )value;
	256	sr_dbg("Setting sample limit to %" PRIu64 ".",
	257	devc->limit_samples);
	258	break;
ac3898d2	259	default:
035a1078	260	sr_err("Unknown hardware capability: %d.", id);
ac3898d2 BV	261	ret = SR_ERR_ARG;
	262	}
	263
	264	return ret;
	265	}
	266
a1c743fc BV	267	static int config_list(int key, const void *data, const struct sr_dev_inst sdi)
	268	{
	269
	270	(void)sdi;
	271
	272	switch (key) {
9a6517d1 BV	273	case SR_CONF_DEVICE_OPTIONS:
	274	*data = hwcaps;
	275	break;
a1c743fc BV	276	default:
	277	return SR_ERR_ARG;
	278	}
	279
	280	return SR_OK;
	281	}
	282
7a360375 BV	283	static void receive_transfer(struct libusb_transfer *transfer)
	284	{
	285	struct dev_context *devc;
	286	struct sr_dev_inst *sdi;
	287	int ret;
	288
	289	sdi = transfer->user_data;
	290	devc = sdi->priv;
	291	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	292	/* USB device was unplugged. */
	293	hw_dev_acquisition_stop(sdi, sdi);
	294	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
fa773062	295	sr_dbg("Got %d-byte packet.", transfer->actual_length);
ff945683 BV	296	if (transfer->actual_length == DMM_DATA_SIZE) {
ff945683 BV	297	victor_dmm_receive_data(sdi, transfer->buffer);
7a360375 BV	298	if (devc->limit_samples) {
	299	if (devc->num_samples >= devc->limit_samples)
	300	hw_dev_acquisition_stop(sdi, sdi);
	301	}
	302	}
	303	}
	304	/* Anything else is either an error or a timeout, which is fine:
	305	* we were just going to send another transfer request anyway. */
	306
	307	if (sdi->status == SR_ST_ACTIVE) {
	308	/* Send the same request again. */
	309	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062 UH	310	sr_err("Unable to resubmit transfer: %s.",
fa773062 UH	311	libusb_error_name(ret));
7a360375	312	g_free(transfer->buffer);
9ec7ff94	313	libusb_free_transfer(transfer);
7a360375 BV	314	hw_dev_acquisition_stop(sdi, sdi);
	315	}
	316	} else {
	317	/* This was the last transfer we're going to receive, so
	318	* clean up now. */
7a360375	319	g_free(transfer->buffer);
9ec7ff94	320	libusb_free_transfer(transfer);
7a360375	321	}
7a360375 BV	322	}
	323
	324	static int handle_events(int fd, int revents, void *cb_data)
	325	{
	326	struct dev_context *devc;
d4abb463	327	struct drv_context *drvc = di->priv;
7a360375 BV	328	struct sr_datafeed_packet packet;
	329	struct sr_dev_inst *sdi;
	330	struct timeval tv;
	331	gint64 now;
	332	int i;
	333
	334	(void)fd;
	335	(void)revents;
	336
	337	sdi = cb_data;
	338	devc = sdi->priv;
	339
	340	if (devc->limit_msec) {
	341	now = g_get_monotonic_time() / 1000;
	342	if (now > devc->end_time)
	343	hw_dev_acquisition_stop(sdi, sdi);
	344	}
	345
	346	if (sdi->status == SR_ST_STOPPING) {
	347	for (i = 0; devc->usbfd[i] != -1; i++)
	348	sr_source_remove(devc->usbfd[i]);
	349
	350	hw_dev_close(sdi);
	351
	352	packet.type = SR_DF_END;
	353	sr_session_send(cb_data, &packet);
	354	}
	355
	356	memset(&tv, 0, sizeof(struct timeval));
d4abb463 PS	357	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
d4abb463 PS	358	NULL);
7a360375 BV	359
	360	return TRUE;
	361	}
	362
ac3898d2 BV	363	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	364	void *cb_data)
	365	{
7a360375	366	struct dev_context *devc;
d4abb463	367	struct drv_context *drvc = di->priv;
7a360375 BV	368	const struct libusb_pollfd **pfd;
	369	struct libusb_transfer *transfer;
	370	int ret, i;
	371	unsigned char *buf;
	372
	373	if (!di->priv) {
	374	sr_err("Driver was not initialized.");
	375	return SR_ERR;
	376	}
	377
7a360375 BV	378	devc = sdi->priv;
	379	devc->cb_data = cb_data;
	380
	381	/* Send header packet to the session bus. */
4afdfd46	382	std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
7a360375	383
d4abb463	384	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
7a360375 BV	385	for (i = 0; pfd[i]; i++) {
	386	/* Handle USB events every 100ms, for decent latency. */
	387	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	388	handle_events, (void *)sdi);
	389	/* We'll need to remove this fd later. */
	390	devc->usbfd[i] = pfd[i]->fd;
	391	}
	392	devc->usbfd[i] = -1;
	393
ff945683	394	buf = g_try_malloc(DMM_DATA_SIZE);
7a360375 BV	395	transfer = libusb_alloc_transfer(0);
	396	/* Each transfer request gets 100ms to arrive before it's restarted.
	397	* The device only sends 1 transfer/second no matter how many
	398	* times you ask, but we want to keep step with the USB events
	399	* handling above. */
	400	libusb_fill_interrupt_transfer(transfer, devc->usb->devhdl,
fa773062 UH	401	VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
fa773062 UH	402	cb_data, 100);
7a360375	403	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062	404	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
7a360375 BV	405	libusb_free_transfer(transfer);
	406	g_free(buf);
	407	return SR_ERR;
	408	}
ac3898d2 BV	409
	410	return SR_OK;
	411	}
	412
7a360375	413	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
ac3898d2 BV	414	{
	415	(void)cb_data;
	416
7a360375 BV	417	if (!di->priv) {
	418	sr_err("Driver was not initialized.");
	419	return SR_ERR;
	420	}
	421
ac3898d2	422	if (sdi->status != SR_ST_ACTIVE) {
7a360375	423	sr_err("Device not active, can't stop acquisition.");
ac3898d2 BV	424	return SR_ERR;
	425	}
	426
7a360375	427	sdi->status = SR_ST_STOPPING;
ac3898d2 BV	428
	429	return SR_OK;
	430	}
	431
	432	SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	433	.name = "victor-dmm",
7a360375	434	.longname = "Victor DMMs",
ac3898d2 BV	435	.api_version = 1,
	436	.init = hw_init,
	437	.cleanup = hw_cleanup,
	438	.scan = hw_scan,
	439	.dev_list = hw_dev_list,
	440	.dev_clear = clear_instances,
035a1078	441	.config_set = config_set,
a1c743fc	442	.config_list = config_list,
ac3898d2 BV	443	.dev_open = hw_dev_open,
ac3898d2 BV	444	.dev_close = hw_dev_close,
ac3898d2 BV	445	.dev_acquisition_start = hw_dev_acquisition_start,
	446	.dev_acquisition_stop = hw_dev_acquisition_stop,
	447	.priv = NULL,
	448	};