[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 "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"
#include <libusb.h>
#include <stdlib.h>
#include <string.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_HWCAP_MULTIMETER,
	SR_HWCAP_LIMIT_MSEC,
	SR_HWCAP_LIMIT_SAMPLES,
	SR_HWCAP_CONTINUOUS,
	0
};

static const char *probe_names[] = {
	"P1",
};


/* 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(void)
{
	struct drv_context *drvc;

	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
		sr_err("Driver context malloc failed.");
		return SR_ERR_MALLOC;
	}
	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(NULL, &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;
	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(NULL, &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 (libusb_detach_kernel_driver(devc->usb->devhdl, 0) < 0) {
			sr_err("Failed to detach kernel driver.");
			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 hw_info_get(int info_id, const void **data,
		       const struct sr_dev_inst *sdi)
{

	(void)sdi;

	switch (info_id) {
		case SR_DI_HWCAPS:
			*data = hwcaps;
			break;
		case SR_DI_NUM_PROBES:
			*data = GINT_TO_POINTER(1);
			break;
		case SR_DI_PROBE_NAMES:
			*data = probe_names;
			break;
		default:
			return SR_ERR_ARG;
	}

	return SR_OK;
}

static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
			     const void *value)
{
	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 (hwcap) {
		case SR_HWCAP_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_HWCAP_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.", hwcap);
		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 == 14) {
			devc->num_samples++;
			/* TODO */

			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));
			libusb_free_transfer(transfer);
			g_free(transfer->buffer);
			hw_dev_acquisition_stop(sdi, sdi);
		}
	} else {
		/* This was the last transfer we're going to receive, so
		 * clean up now. */
		libusb_free_transfer(transfer);
		g_free(transfer->buffer);
	}

}

static int handle_events(int fd, int revents, void *cb_data)
{
	struct dev_context *devc;
	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(NULL, &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 sr_datafeed_meta_analog meta;
	struct dev_context *devc;
	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);

	/* Send metadata about the SR_DF_ANALOG packets to come. */
	packet.type = SR_DF_META_ANALOG;
	packet.payload = &meta;
	meta.num_probes = 1;
	sr_session_send(devc->cb_data, &packet);

	pfd = libusb_get_pollfds(NULL);
	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(14);
	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, 14, 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,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.info_get = hw_info_get,
	.dev_config_set = hw_dev_config_set,
	.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>
	21	#include "libsigrok.h"
	22	#include "libsigrok-internal.h"
	23	#include "protocol.h"
7a360375 BV	24	#include <libusb.h>
	25	#include <stdlib.h>
	26	#include <string.h>
	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[] = {
	40	SR_HWCAP_MULTIMETER,
	41	SR_HWCAP_LIMIT_MSEC,
	42	SR_HWCAP_LIMIT_SAMPLES,
	43	SR_HWCAP_CONTINUOUS,
	44	0
	45	};
	46
	47	static const char *probe_names[] = {
	48	"P1",
	49	};
	50
ac3898d2 BV	51
	52	/* Properly close and free all devices. */
	53	static int clear_instances(void)
	54	{
	55	struct sr_dev_inst *sdi;
	56	struct drv_context *drvc;
	57	struct dev_context *devc;
	58	GSList *l;
	59
7a360375 BV	60	if (!(drvc = di->priv))
	61	/* Can get called on an unused driver, doesn't matter. */
	62	return SR_OK;
	63
ac3898d2 BV	64	for (l = drvc->instances; l; l = l->next) {
	65	if (!(sdi = l->data))
	66	continue;
	67	if (!(devc = sdi->priv))
	68	continue;
7a360375 BV	69	hw_dev_close(sdi);
7a360375 BV	70	sr_usb_dev_inst_free(devc->usb);
ac3898d2 BV	71	sr_dev_inst_free(sdi);
	72	}
	73
	74	g_slist_free(drvc->instances);
	75	drvc->instances = NULL;
	76
	77	return SR_OK;
	78	}
	79
	80	static int hw_init(void)
	81	{
	82	struct drv_context *drvc;
	83
	84	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	85	sr_err("Driver context malloc failed.");
	86	return SR_ERR_MALLOC;
	87	}
ac3898d2 BV	88	di->priv = drvc;
	89
	90	return SR_OK;
	91	}
	92
	93	static GSList hw_scan(GSList options)
	94	{
	95	struct drv_context *drvc;
7a360375 BV	96	struct dev_context *devc;
	97	struct sr_dev_inst *sdi;
	98	struct sr_probe *probe;
	99	struct libusb_device_descriptor des;
	100	libusb_device **devlist;
ac3898d2	101	GSList *devices;
7a360375	102	int ret, devcnt, i;
ac3898d2 BV	103
	104	(void)options;
	105
7a360375 BV	106	if (!(drvc = di->priv)) {
	107	sr_err("Driver was not initialized.");
	108	return NULL;
	109	}
	110
	111	/* USB scan is always authoritative. */
	112	clear_instances();
	113
ac3898d2	114	devices = NULL;
7a360375 BV	115	libusb_get_device_list(NULL, &devlist);
	116	for (i = 0; devlist[i]; i++) {
	117	if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
	118	sr_warn("Failed to get device descriptor: %s",
	119	libusb_error_name(ret));
	120	continue;
	121	}
ac3898d2	122
7a360375 BV	123	if (des.idVendor != VICTOR_VID \|\| des.idProduct != VICTOR_PID)
	124	continue;
	125
	126	devcnt = g_slist_length(drvc->instances);
	127	if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE, VICTOR_VENDOR,
	128	NULL, NULL)))
	129	return NULL;
	130	sdi->driver = di;
	131
	132	if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
	133	return NULL;
	134	sdi->priv = devc;
	135
	136	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	137	return NULL;
	138	sdi->probes = g_slist_append(NULL, probe);
	139
	140	if (!(devc->usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
	141	libusb_get_device_address(devlist[i]), NULL)))
	142	return NULL;
	143
	144	drvc->instances = g_slist_append(drvc->instances, sdi);
	145	devices = g_slist_append(devices, sdi);
	146	}
	147	libusb_free_device_list(devlist, 1);
ac3898d2 BV	148
	149	return devices;
	150	}
	151
	152	static GSList *hw_dev_list(void)
	153	{
	154	struct drv_context *drvc;
	155
7a360375 BV	156	if (!(drvc = di->priv)) {
	157	sr_err("Driver was not initialized.");
	158	return NULL;
	159	}
ac3898d2 BV	160
	161	return drvc->instances;
	162	}
	163
	164	static int hw_dev_open(struct sr_dev_inst *sdi)
	165	{
7a360375 BV	166	struct dev_context *devc;
	167	libusb_device **devlist;
	168	int ret, i;
	169
	170	if (!di->priv) {
	171	sr_err("Driver was not initialized.");
	172	return SR_ERR;
	173	}
	174
	175	devc = sdi->priv;
	176	libusb_get_device_list(NULL, &devlist);
	177	for (i = 0; devlist[i]; i++) {
	178	if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
	179	\|\| libusb_get_device_address(devlist[i]) != devc->usb->address)
	180	continue;
	181	if ((ret = libusb_open(devlist[i], &devc->usb->devhdl))) {
	182	sr_err("Failed to open device: %s", libusb_error_name(ret));
	183	return SR_ERR;
	184	}
	185	break;
	186	}
	187	libusb_free_device_list(devlist, 1);
	188	if (!devlist[i]) {
	189	sr_err("Device not found.");
	190	return SR_ERR;
	191	}
	192
	193	/* The device reports as HID class, so the kernel would have
	194	* claimed it. */
	195	if (libusb_kernel_driver_active(devc->usb->devhdl, 0) == 1) {
	196	if (libusb_detach_kernel_driver(devc->usb->devhdl, 0) < 0) {
	197	sr_err("Failed to detach kernel driver.");
	198	return SR_ERR;
	199	}
	200	}
	201
	202	if ((ret = libusb_claim_interface(devc->usb->devhdl,
	203	VICTOR_INTERFACE))) {
	204	sr_err("Failed to claim interface: %s", libusb_error_name(ret));
	205	return SR_ERR;
	206	}
	207	sdi->status = SR_ST_ACTIVE;
ac3898d2 BV	208
	209	return SR_OK;
	210	}
	211
	212	static int hw_dev_close(struct sr_dev_inst *sdi)
	213	{
7a360375 BV	214	struct dev_context *devc;
	215
	216	if (!di->priv) {
	217	sr_err("Driver was not initialized.");
	218	return SR_ERR;
	219	}
	220
	221	devc = sdi->priv;
	222	if (!devc->usb->devhdl)
	223	/* Nothing to do. */
	224	return SR_OK;
	225
	226	libusb_release_interface(devc->usb->devhdl, VICTOR_INTERFACE);
	227	libusb_close(devc->usb->devhdl);
	228	devc->usb->devhdl = NULL;
	229	sdi->status = SR_ST_INACTIVE;
ac3898d2 BV	230
	231	return SR_OK;
	232	}
	233
	234	static int hw_cleanup(void)
	235	{
7a360375 BV	236	struct drv_context *drvc;
	237
	238	if (!(drvc = di->priv))
	239	/* Can get called on an unused driver, doesn't matter. */
	240	return SR_OK;
ac3898d2	241
7a360375 BV	242	clear_instances();
	243	g_free(drvc);
	244	di->priv = NULL;
ac3898d2 BV	245
	246	return SR_OK;
	247	}
	248
	249	static int hw_info_get(int info_id, const void **data,
	250	const struct sr_dev_inst *sdi)
	251	{
7a360375 BV	252
	253	(void)sdi;
	254
ac3898d2	255	switch (info_id) {
7a360375 BV	256	case SR_DI_HWCAPS:
	257	*data = hwcaps;
	258	break;
	259	case SR_DI_NUM_PROBES:
	260	*data = GINT_TO_POINTER(1);
	261	break;
	262	case SR_DI_PROBE_NAMES:
	263	*data = probe_names;
	264	break;
	265	default:
	266	return SR_ERR_ARG;
ac3898d2 BV	267	}
	268
	269	return SR_OK;
	270	}
	271
	272	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	273	const void *value)
	274	{
7a360375 BV	275	struct dev_context *devc;
7a360375 BV	276	gint64 now;
ac3898d2 BV	277	int ret;
ac3898d2 BV	278
7a360375 BV	279	if (!di->priv) {
	280	sr_err("Driver was not initialized.");
	281	return SR_ERR;
	282	}
	283
ac3898d2 BV	284	if (sdi->status != SR_ST_ACTIVE) {
	285	sr_err("Device inactive, can't set config options.");
	286	return SR_ERR;
	287	}
	288
7a360375	289	devc = sdi->priv;
ac3898d2 BV	290	ret = SR_OK;
ac3898d2 BV	291	switch (hwcap) {
7a360375 BV	292	case SR_HWCAP_LIMIT_MSEC:
	293	devc->limit_msec = (const int64_t )value;
	294	now = g_get_monotonic_time() / 1000;
	295	devc->end_time = now + devc->limit_msec;
	296	sr_dbg("setting time limit to %" PRIu64 "ms.",
	297	devc->limit_msec);
	298	break;
	299	case SR_HWCAP_LIMIT_SAMPLES:
	300	devc->limit_samples = (const uint64_t )value;
	301	sr_dbg("setting sample limit to %" PRIu64 ".",
	302	devc->limit_samples);
	303	break;
ac3898d2 BV	304	default:
	305	sr_err("Unknown hardware capability: %d.", hwcap);
	306	ret = SR_ERR_ARG;
	307	}
	308
	309	return ret;
	310	}
	311
7a360375 BV	312	static void receive_transfer(struct libusb_transfer *transfer)
	313	{
	314	struct dev_context *devc;
	315	struct sr_dev_inst *sdi;
	316	int ret;
	317
	318	sdi = transfer->user_data;
	319	devc = sdi->priv;
	320	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	321	/* USB device was unplugged. */
	322	hw_dev_acquisition_stop(sdi, sdi);
	323	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
	324	sr_dbg("got %d-byte packet", transfer->actual_length);
	325	if (transfer->actual_length == 14) {
	326	devc->num_samples++;
	327	/* TODO */
	328
	329	if (devc->limit_samples) {
	330	if (devc->num_samples >= devc->limit_samples)
	331	hw_dev_acquisition_stop(sdi, sdi);
	332	}
	333	}
	334	}
	335	/* Anything else is either an error or a timeout, which is fine:
	336	* we were just going to send another transfer request anyway. */
	337
	338	if (sdi->status == SR_ST_ACTIVE) {
	339	/* Send the same request again. */
	340	if ((ret = libusb_submit_transfer(transfer) != 0)) {
	341	sr_err("unable to resubmit transfer: %s", libusb_error_name(ret));
	342	libusb_free_transfer(transfer);
	343	g_free(transfer->buffer);
	344	hw_dev_acquisition_stop(sdi, sdi);
	345	}
	346	} else {
	347	/* This was the last transfer we're going to receive, so
	348	* clean up now. */
	349	libusb_free_transfer(transfer);
	350	g_free(transfer->buffer);
	351	}
	352
	353	}
	354
	355	static int handle_events(int fd, int revents, void *cb_data)
	356	{
	357	struct dev_context *devc;
	358	struct sr_datafeed_packet packet;
	359	struct sr_dev_inst *sdi;
	360	struct timeval tv;
	361	gint64 now;
	362	int i;
	363
	364	(void)fd;
	365	(void)revents;
	366
	367	sdi = cb_data;
	368	devc = sdi->priv;
	369
	370	if (devc->limit_msec) {
	371	now = g_get_monotonic_time() / 1000;
	372	if (now > devc->end_time)
	373	hw_dev_acquisition_stop(sdi, sdi);
	374	}
	375
376	if (sdi->status == SR_ST_STOPPING) {
377	for (i = 0; devc->usbfd[i] != -1; i++)
378	sr_source_remove(devc->usbfd[i]);
379
380	hw_dev_close(sdi);
381
382	packet.type = SR_DF_END;
383	sr_session_send(cb_data, &packet);
384	}
385
386	memset(&tv, 0, sizeof(struct timeval));
387	libusb_handle_events_timeout_completed(NULL, &tv, NULL);
388
389	return TRUE;
390	}
391
ac3898d2 BV	392	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	393	void *cb_data)
	394	{
7a360375 BV	395	struct sr_datafeed_packet packet;
	396	struct sr_datafeed_header header;
	397	struct sr_datafeed_meta_analog meta;
	398	struct dev_context *devc;
	399	const struct libusb_pollfd **pfd;
	400	struct libusb_transfer *transfer;
	401	int ret, i;
	402	unsigned char *buf;
	403
	404	if (!di->priv) {
	405	sr_err("Driver was not initialized.");
	406	return SR_ERR;
	407	}
	408
	409	sr_dbg("Starting acquisition.");
	410
	411	devc = sdi->priv;
	412	devc->cb_data = cb_data;
	413
	414	/* Send header packet to the session bus. */
	415	sr_dbg("Sending SR_DF_HEADER.");
	416	packet.type = SR_DF_HEADER;
	417	packet.payload = (uint8_t *)&header;
	418	header.feed_version = 1;
	419	sr_session_send(devc->cb_data, &packet);
	420
	421	/* Send metadata about the SR_DF_ANALOG packets to come. */
	422	packet.type = SR_DF_META_ANALOG;
	423	packet.payload = &meta;
	424	meta.num_probes = 1;
	425	sr_session_send(devc->cb_data, &packet);
	426
	427	pfd = libusb_get_pollfds(NULL);
	428	for (i = 0; pfd[i]; i++) {
	429	/* Handle USB events every 100ms, for decent latency. */
	430	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	431	handle_events, (void *)sdi);
	432	/* We'll need to remove this fd later. */
	433	devc->usbfd[i] = pfd[i]->fd;
	434	}
	435	devc->usbfd[i] = -1;
	436
	437	buf = g_try_malloc(14);
	438	transfer = libusb_alloc_transfer(0);
	439	/* Each transfer request gets 100ms to arrive before it's restarted.
	440	* The device only sends 1 transfer/second no matter how many
	441	* times you ask, but we want to keep step with the USB events
	442	* handling above. */
	443	libusb_fill_interrupt_transfer(transfer, devc->usb->devhdl,
	444	VICTOR_ENDPOINT, buf, 14, receive_transfer, cb_data, 100);
	445	if ((ret = libusb_submit_transfer(transfer) != 0)) {
	446	sr_err("unable to submit transfer: %s", libusb_error_name(ret));
	447	libusb_free_transfer(transfer);
	448	g_free(buf);
	449	return SR_ERR;
	450	}
ac3898d2 BV	451
	452	return SR_OK;
	453	}
	454
7a360375	455	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
ac3898d2	456	{
7a360375	457
ac3898d2 BV	458	(void)cb_data;
ac3898d2 BV	459
7a360375 BV	460	if (!di->priv) {
	461	sr_err("Driver was not initialized.");
	462	return SR_ERR;
	463	}
	464
ac3898d2	465	if (sdi->status != SR_ST_ACTIVE) {
7a360375	466	sr_err("Device not active, can't stop acquisition.");
ac3898d2 BV	467	return SR_ERR;
	468	}
	469
7a360375	470	sdi->status = SR_ST_STOPPING;
ac3898d2 BV	471
	472	return SR_OK;
	473	}
	474
	475	SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	476	.name = "victor-dmm",
7a360375	477	.longname = "Victor DMMs",
ac3898d2 BV	478	.api_version = 1,
	479	.init = hw_init,
	480	.cleanup = hw_cleanup,
	481	.scan = hw_scan,
	482	.dev_list = hw_dev_list,
	483	.dev_clear = clear_instances,
	484	.dev_open = hw_dev_open,
	485	.dev_close = hw_dev_close,
	486	.info_get = hw_info_get,
	487	.dev_config_set = hw_dev_config_set,
	488	.dev_acquisition_start = hw_dev_acquisition_start,
	489	.dev_acquisition_stop = hw_dev_acquisition_stop,
	490	.priv = NULL,
	491	};