[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)
{
	struct drv_context *drvc;

	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
		sr_err("Driver context malloc failed.");
		return SR_ERR_MALLOC;
	}
	drvc->sr_ctx = sr_ctx;
	di->priv = drvc;

	return SR_OK;
}

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;

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

	/* 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)
{
	struct drv_context *drvc;

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

	return drvc->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_get(int id, const void **data, const struct sr_dev_inst *sdi)
{
	(void)sdi;

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

	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 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 sr_datafeed_packet packet;
	struct sr_datafeed_header header;
	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;
	}

	sr_dbg("Starting acquisition.");

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

	/* Send header packet to the session bus. */
	sr_dbg("Sending SR_DF_HEADER.");
	packet.type = SR_DF_HEADER;
	packet.payload = (uint8_t *)&header;
	header.feed_version = 1;
	sr_session_send(devc->cb_data, &packet);

	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_get = config_get,
	.config_set = config_set,
	.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 BV	76	{
	77	struct drv_context *drvc;
	78
	79	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	80	sr_err("Driver context malloc failed.");
	81	return SR_ERR_MALLOC;
	82	}
1ebe4b4e	83	drvc->sr_ctx = sr_ctx;
ac3898d2 BV	84	di->priv = drvc;
	85
	86	return SR_OK;
	87	}
	88
	89	static GSList hw_scan(GSList options)
	90	{
	91	struct drv_context *drvc;
7a360375 BV	92	struct dev_context *devc;
	93	struct sr_dev_inst *sdi;
	94	struct sr_probe *probe;
	95	struct libusb_device_descriptor des;
	96	libusb_device **devlist;
ac3898d2	97	GSList *devices;
7a360375	98	int ret, devcnt, i;
ac3898d2 BV	99
	100	(void)options;
	101
7a360375 BV	102	if (!(drvc = di->priv)) {
	103	sr_err("Driver was not initialized.");
	104	return NULL;
	105	}
	106
	107	/* USB scan is always authoritative. */
	108	clear_instances();
	109
ac3898d2	110	devices = NULL;
d4abb463	111	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375 BV	112	for (i = 0; devlist[i]; i++) {
	113	if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
	114	sr_warn("Failed to get device descriptor: %s",
	115	libusb_error_name(ret));
	116	continue;
	117	}
ac3898d2	118
7a360375 BV	119	if (des.idVendor != VICTOR_VID \|\| des.idProduct != VICTOR_PID)
	120	continue;
	121
	122	devcnt = g_slist_length(drvc->instances);
fa773062 UH	123	if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
fa773062 UH	124	VICTOR_VENDOR, NULL, NULL)))
7a360375 BV	125	return NULL;
	126	sdi->driver = di;
	127
	128	if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
	129	return NULL;
	130	sdi->priv = devc;
	131
	132	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	133	return NULL;
	134	sdi->probes = g_slist_append(NULL, probe);
	135
	136	if (!(devc->usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
	137	libusb_get_device_address(devlist[i]), NULL)))
	138	return NULL;
	139
	140	drvc->instances = g_slist_append(drvc->instances, sdi);
	141	devices = g_slist_append(devices, sdi);
	142	}
	143	libusb_free_device_list(devlist, 1);
ac3898d2 BV	144
	145	return devices;
	146	}
	147
	148	static GSList *hw_dev_list(void)
	149	{
	150	struct drv_context *drvc;
	151
7a360375 BV	152	if (!(drvc = di->priv)) {
	153	sr_err("Driver was not initialized.");
	154	return NULL;
	155	}
ac3898d2 BV	156
	157	return drvc->instances;
	158	}
	159
	160	static int hw_dev_open(struct sr_dev_inst *sdi)
	161	{
7a360375	162	struct dev_context *devc;
d4abb463	163	struct drv_context *drvc = di->priv;
7a360375 BV	164	libusb_device **devlist;
	165	int ret, i;
	166
	167	if (!di->priv) {
	168	sr_err("Driver was not initialized.");
	169	return SR_ERR;
	170	}
	171
	172	devc = sdi->priv;
d4abb463	173	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375 BV	174	for (i = 0; devlist[i]; i++) {
	175	if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
	176	\|\| libusb_get_device_address(devlist[i]) != devc->usb->address)
	177	continue;
	178	if ((ret = libusb_open(devlist[i], &devc->usb->devhdl))) {
fa773062	179	sr_err("Failed to open device: %s.", libusb_error_name(ret));
7a360375 BV	180	return SR_ERR;
	181	}
	182	break;
	183	}
	184	libusb_free_device_list(devlist, 1);
	185	if (!devlist[i]) {
	186	sr_err("Device not found.");
	187	return SR_ERR;
	188	}
	189
	190	/* The device reports as HID class, so the kernel would have
	191	* claimed it. */
	192	if (libusb_kernel_driver_active(devc->usb->devhdl, 0) == 1) {
d4928d71 PS	193	if ((ret = libusb_detach_kernel_driver(devc->usb->devhdl, 0)) < 0) {
	194	sr_err("Failed to detach kernel driver: %s.",
	195	libusb_error_name(ret));
7a360375 BV	196	return SR_ERR;
	197	}
	198	}
	199
	200	if ((ret = libusb_claim_interface(devc->usb->devhdl,
	201	VICTOR_INTERFACE))) {
fa773062	202	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
7a360375 BV	203	return SR_ERR;
	204	}
	205	sdi->status = SR_ST_ACTIVE;
ac3898d2 BV	206
	207	return SR_OK;
	208	}
	209
	210	static int hw_dev_close(struct sr_dev_inst *sdi)
	211	{
7a360375 BV	212	struct dev_context *devc;
	213
	214	if (!di->priv) {
	215	sr_err("Driver was not initialized.");
	216	return SR_ERR;
	217	}
	218
	219	devc = sdi->priv;
	220	if (!devc->usb->devhdl)
	221	/* Nothing to do. */
	222	return SR_OK;
	223
	224	libusb_release_interface(devc->usb->devhdl, VICTOR_INTERFACE);
	225	libusb_close(devc->usb->devhdl);
	226	devc->usb->devhdl = NULL;
	227	sdi->status = SR_ST_INACTIVE;
ac3898d2 BV	228
	229	return SR_OK;
	230	}
	231
	232	static int hw_cleanup(void)
	233	{
7a360375 BV	234	struct drv_context *drvc;
	235
	236	if (!(drvc = di->priv))
	237	/* Can get called on an unused driver, doesn't matter. */
	238	return SR_OK;
ac3898d2	239
7a360375 BV	240	clear_instances();
	241	g_free(drvc);
	242	di->priv = NULL;
ac3898d2 BV	243
	244	return SR_OK;
	245	}
	246
035a1078	247	static int config_get(int id, const void *data, const struct sr_dev_inst sdi)
ac3898d2	248	{
7a360375 BV	249	(void)sdi;
7a360375 BV	250
035a1078	251	switch (id) {
fa773062 UH	252	case SR_DI_HWCAPS:
	253	*data = hwcaps;
	254	break;
fa773062	255	default:
fa773062	256	return SR_ERR_ARG;
ac3898d2 BV	257	}
	258
	259	return SR_OK;
	260	}
	261
035a1078	262	static int config_set(int id, const void value, const struct sr_dev_inst sdi)
ac3898d2	263	{
7a360375 BV	264	struct dev_context *devc;
7a360375 BV	265	gint64 now;
ac3898d2 BV	266	int ret;
ac3898d2 BV	267
7a360375 BV	268	if (!di->priv) {
	269	sr_err("Driver was not initialized.");
	270	return SR_ERR;
	271	}
	272
ac3898d2 BV	273	if (sdi->status != SR_ST_ACTIVE) {
	274	sr_err("Device inactive, can't set config options.");
	275	return SR_ERR;
	276	}
	277
7a360375	278	devc = sdi->priv;
ac3898d2	279	ret = SR_OK;
035a1078	280	switch (id) {
1953564a	281	case SR_CONF_LIMIT_MSEC:
fa773062 UH	282	devc->limit_msec = (const int64_t )value;
	283	now = g_get_monotonic_time() / 1000;
	284	devc->end_time = now + devc->limit_msec;
	285	sr_dbg("Setting time limit to %" PRIu64 "ms.",
	286	devc->limit_msec);
	287	break;
1953564a	288	case SR_CONF_LIMIT_SAMPLES:
fa773062 UH	289	devc->limit_samples = (const uint64_t )value;
	290	sr_dbg("Setting sample limit to %" PRIu64 ".",
	291	devc->limit_samples);
	292	break;
ac3898d2	293	default:
035a1078	294	sr_err("Unknown hardware capability: %d.", id);
ac3898d2 BV	295	ret = SR_ERR_ARG;
	296	}
	297
	298	return ret;
	299	}
	300
7a360375 BV	301	static void receive_transfer(struct libusb_transfer *transfer)
	302	{
	303	struct dev_context *devc;
	304	struct sr_dev_inst *sdi;
	305	int ret;
	306
	307	sdi = transfer->user_data;
	308	devc = sdi->priv;
	309	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	310	/* USB device was unplugged. */
	311	hw_dev_acquisition_stop(sdi, sdi);
	312	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
fa773062	313	sr_dbg("Got %d-byte packet.", transfer->actual_length);
ff945683 BV	314	if (transfer->actual_length == DMM_DATA_SIZE) {
ff945683 BV	315	victor_dmm_receive_data(sdi, transfer->buffer);
7a360375 BV	316	if (devc->limit_samples) {
	317	if (devc->num_samples >= devc->limit_samples)
	318	hw_dev_acquisition_stop(sdi, sdi);
	319	}
	320	}
	321	}
	322	/* Anything else is either an error or a timeout, which is fine:
	323	* we were just going to send another transfer request anyway. */
	324
	325	if (sdi->status == SR_ST_ACTIVE) {
	326	/* Send the same request again. */
	327	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062 UH	328	sr_err("Unable to resubmit transfer: %s.",
fa773062 UH	329	libusb_error_name(ret));
7a360375	330	g_free(transfer->buffer);
9ec7ff94	331	libusb_free_transfer(transfer);
7a360375 BV	332	hw_dev_acquisition_stop(sdi, sdi);
	333	}
	334	} else {
	335	/* This was the last transfer we're going to receive, so
	336	* clean up now. */
7a360375	337	g_free(transfer->buffer);
9ec7ff94	338	libusb_free_transfer(transfer);
7a360375	339	}
7a360375 BV	340	}
	341
	342	static int handle_events(int fd, int revents, void *cb_data)
	343	{
	344	struct dev_context *devc;
d4abb463	345	struct drv_context *drvc = di->priv;
7a360375 BV	346	struct sr_datafeed_packet packet;
	347	struct sr_dev_inst *sdi;
	348	struct timeval tv;
	349	gint64 now;
	350	int i;
	351
	352	(void)fd;
	353	(void)revents;
	354
	355	sdi = cb_data;
	356	devc = sdi->priv;
	357
	358	if (devc->limit_msec) {
	359	now = g_get_monotonic_time() / 1000;
	360	if (now > devc->end_time)
	361	hw_dev_acquisition_stop(sdi, sdi);
	362	}
	363
	364	if (sdi->status == SR_ST_STOPPING) {
	365	for (i = 0; devc->usbfd[i] != -1; i++)
	366	sr_source_remove(devc->usbfd[i]);
	367
	368	hw_dev_close(sdi);
	369
	370	packet.type = SR_DF_END;
	371	sr_session_send(cb_data, &packet);
	372	}
	373
	374	memset(&tv, 0, sizeof(struct timeval));
d4abb463 PS	375	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
d4abb463 PS	376	NULL);
7a360375 BV	377
	378	return TRUE;
	379	}
	380
ac3898d2 BV	381	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	382	void *cb_data)
	383	{
7a360375 BV	384	struct sr_datafeed_packet packet;
7a360375 BV	385	struct sr_datafeed_header header;
7a360375	386	struct dev_context *devc;
d4abb463	387	struct drv_context *drvc = di->priv;
7a360375 BV	388	const struct libusb_pollfd **pfd;
	389	struct libusb_transfer *transfer;
	390	int ret, i;
	391	unsigned char *buf;
	392
	393	if (!di->priv) {
	394	sr_err("Driver was not initialized.");
	395	return SR_ERR;
	396	}
	397
	398	sr_dbg("Starting acquisition.");
	399
	400	devc = sdi->priv;
	401	devc->cb_data = cb_data;
	402
	403	/* Send header packet to the session bus. */
	404	sr_dbg("Sending SR_DF_HEADER.");
	405	packet.type = SR_DF_HEADER;
	406	packet.payload = (uint8_t *)&header;
	407	header.feed_version = 1;
	408	sr_session_send(devc->cb_data, &packet);
	409
d4abb463	410	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
7a360375 BV	411	for (i = 0; pfd[i]; i++) {
	412	/* Handle USB events every 100ms, for decent latency. */
	413	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	414	handle_events, (void *)sdi);
	415	/* We'll need to remove this fd later. */
	416	devc->usbfd[i] = pfd[i]->fd;
	417	}
	418	devc->usbfd[i] = -1;
	419
ff945683	420	buf = g_try_malloc(DMM_DATA_SIZE);
7a360375 BV	421	transfer = libusb_alloc_transfer(0);
	422	/* Each transfer request gets 100ms to arrive before it's restarted.
	423	* The device only sends 1 transfer/second no matter how many
	424	* times you ask, but we want to keep step with the USB events
	425	* handling above. */
	426	libusb_fill_interrupt_transfer(transfer, devc->usb->devhdl,
fa773062 UH	427	VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
fa773062 UH	428	cb_data, 100);
7a360375	429	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062	430	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
7a360375 BV	431	libusb_free_transfer(transfer);
	432	g_free(buf);
	433	return SR_ERR;
	434	}
ac3898d2 BV	435
	436	return SR_OK;
	437	}
	438
7a360375	439	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
ac3898d2 BV	440	{
	441	(void)cb_data;
	442
7a360375 BV	443	if (!di->priv) {
	444	sr_err("Driver was not initialized.");
	445	return SR_ERR;
	446	}
	447
ac3898d2	448	if (sdi->status != SR_ST_ACTIVE) {
7a360375	449	sr_err("Device not active, can't stop acquisition.");
ac3898d2 BV	450	return SR_ERR;
	451	}
	452
7a360375	453	sdi->status = SR_ST_STOPPING;
ac3898d2 BV	454
	455	return SR_OK;
	456	}
	457
	458	SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	459	.name = "victor-dmm",
7a360375	460	.longname = "Victor DMMs",
ac3898d2 BV	461	.api_version = 1,
	462	.init = hw_init,
	463	.cleanup = hw_cleanup,
	464	.scan = hw_scan,
	465	.dev_list = hw_dev_list,
	466	.dev_clear = clear_instances,
035a1078 BV	467	.config_get = config_get,
035a1078 BV	468	.config_set = config_set,
ac3898d2 BV	469	.dev_open = hw_dev_open,
ac3898d2 BV	470	.dev_close = hw_dev_close,
ac3898d2 BV	471	.dev_acquisition_start = hw_dev_acquisition_start,
	472	.dev_acquisition_stop = hw_dev_acquisition_stop,
	473	.priv = NULL,
	474	};