[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_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(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 (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:
		sr_err("Unknown info_id: %d.", info_id);
		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 == 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));
			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 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 sr_datafeed_meta_analog meta;
	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);

	/* 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(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,
	.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>
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[] = {
	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	/* Properly close and free all devices. */
	52	static int clear_instances(void)
	53	{
	54	struct sr_dev_inst *sdi;
	55	struct drv_context *drvc;
	56	struct dev_context *devc;
	57	GSList *l;
	58
7a360375 BV	59	if (!(drvc = di->priv))
	60	/* Can get called on an unused driver, doesn't matter. */
	61	return SR_OK;
	62
ac3898d2 BV	63	for (l = drvc->instances; l; l = l->next) {
	64	if (!(sdi = l->data))
	65	continue;
	66	if (!(devc = sdi->priv))
	67	continue;
7a360375 BV	68	hw_dev_close(sdi);
7a360375 BV	69	sr_usb_dev_inst_free(devc->usb);
ac3898d2 BV	70	sr_dev_inst_free(sdi);
	71	}
	72
	73	g_slist_free(drvc->instances);
	74	drvc->instances = NULL;
	75
	76	return SR_OK;
	77	}
	78
34f06b90	79	static int hw_init(struct sr_context *sr_ctx)
ac3898d2 BV	80	{
	81	struct drv_context *drvc;
	82
	83	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	84	sr_err("Driver context malloc failed.");
	85	return SR_ERR_MALLOC;
	86	}
1ebe4b4e	87	drvc->sr_ctx = sr_ctx;
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;
d4abb463	115	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375 BV	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);
fa773062 UH	127	if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
fa773062 UH	128	VICTOR_VENDOR, NULL, NULL)))
7a360375 BV	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	166	struct dev_context *devc;
d4abb463	167	struct drv_context *drvc = di->priv;
7a360375 BV	168	libusb_device **devlist;
	169	int ret, i;
	170
	171	if (!di->priv) {
	172	sr_err("Driver was not initialized.");
	173	return SR_ERR;
	174	}
	175
	176	devc = sdi->priv;
d4abb463	177	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
7a360375 BV	178	for (i = 0; devlist[i]; i++) {
	179	if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
	180	\|\| libusb_get_device_address(devlist[i]) != devc->usb->address)
	181	continue;
	182	if ((ret = libusb_open(devlist[i], &devc->usb->devhdl))) {
fa773062	183	sr_err("Failed to open device: %s.", libusb_error_name(ret));
7a360375 BV	184	return SR_ERR;
	185	}
	186	break;
	187	}
	188	libusb_free_device_list(devlist, 1);
	189	if (!devlist[i]) {
	190	sr_err("Device not found.");
	191	return SR_ERR;
	192	}
	193
	194	/* The device reports as HID class, so the kernel would have
	195	* claimed it. */
	196	if (libusb_kernel_driver_active(devc->usb->devhdl, 0) == 1) {
	197	if (libusb_detach_kernel_driver(devc->usb->devhdl, 0) < 0) {
	198	sr_err("Failed to detach kernel driver.");
	199	return SR_ERR;
	200	}
	201	}
	202
	203	if ((ret = libusb_claim_interface(devc->usb->devhdl,
	204	VICTOR_INTERFACE))) {
fa773062	205	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
7a360375 BV	206	return SR_ERR;
	207	}
	208	sdi->status = SR_ST_ACTIVE;
ac3898d2 BV	209
	210	return SR_OK;
	211	}
	212
	213	static int hw_dev_close(struct sr_dev_inst *sdi)
	214	{
7a360375 BV	215	struct dev_context *devc;
	216
	217	if (!di->priv) {
	218	sr_err("Driver was not initialized.");
	219	return SR_ERR;
	220	}
	221
	222	devc = sdi->priv;
	223	if (!devc->usb->devhdl)
	224	/* Nothing to do. */
	225	return SR_OK;
	226
	227	libusb_release_interface(devc->usb->devhdl, VICTOR_INTERFACE);
	228	libusb_close(devc->usb->devhdl);
	229	devc->usb->devhdl = NULL;
	230	sdi->status = SR_ST_INACTIVE;
ac3898d2 BV	231
	232	return SR_OK;
	233	}
	234
	235	static int hw_cleanup(void)
	236	{
7a360375 BV	237	struct drv_context *drvc;
	238
	239	if (!(drvc = di->priv))
	240	/* Can get called on an unused driver, doesn't matter. */
	241	return SR_OK;
ac3898d2	242
7a360375 BV	243	clear_instances();
	244	g_free(drvc);
	245	di->priv = NULL;
ac3898d2 BV	246
	247	return SR_OK;
	248	}
	249
	250	static int hw_info_get(int info_id, const void **data,
	251	const struct sr_dev_inst *sdi)
	252	{
7a360375 BV	253	(void)sdi;
7a360375 BV	254
ac3898d2	255	switch (info_id) {
fa773062 UH	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	sr_err("Unknown info_id: %d.", info_id);
	267	return SR_ERR_ARG;
ac3898d2 BV	268	}
	269
	270	return SR_OK;
	271	}
	272
	273	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	274	const void *value)
	275	{
7a360375 BV	276	struct dev_context *devc;
7a360375 BV	277	gint64 now;
ac3898d2 BV	278	int ret;
ac3898d2 BV	279
7a360375 BV	280	if (!di->priv) {
	281	sr_err("Driver was not initialized.");
	282	return SR_ERR;
	283	}
	284
ac3898d2 BV	285	if (sdi->status != SR_ST_ACTIVE) {
	286	sr_err("Device inactive, can't set config options.");
	287	return SR_ERR;
	288	}
	289
7a360375	290	devc = sdi->priv;
ac3898d2 BV	291	ret = SR_OK;
ac3898d2 BV	292	switch (hwcap) {
fa773062 UH	293	case SR_HWCAP_LIMIT_MSEC:
	294	devc->limit_msec = (const int64_t )value;
	295	now = g_get_monotonic_time() / 1000;
	296	devc->end_time = now + devc->limit_msec;
	297	sr_dbg("Setting time limit to %" PRIu64 "ms.",
	298	devc->limit_msec);
	299	break;
	300	case SR_HWCAP_LIMIT_SAMPLES:
	301	devc->limit_samples = (const uint64_t )value;
	302	sr_dbg("Setting sample limit to %" PRIu64 ".",
	303	devc->limit_samples);
	304	break;
ac3898d2 BV	305	default:
	306	sr_err("Unknown hardware capability: %d.", hwcap);
	307	ret = SR_ERR_ARG;
	308	}
	309
	310	return ret;
	311	}
	312
7a360375 BV	313	static void receive_transfer(struct libusb_transfer *transfer)
	314	{
	315	struct dev_context *devc;
	316	struct sr_dev_inst *sdi;
	317	int ret;
	318
	319	sdi = transfer->user_data;
	320	devc = sdi->priv;
	321	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	322	/* USB device was unplugged. */
	323	hw_dev_acquisition_stop(sdi, sdi);
	324	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
fa773062	325	sr_dbg("Got %d-byte packet.", transfer->actual_length);
ff945683 BV	326	if (transfer->actual_length == DMM_DATA_SIZE) {
ff945683 BV	327	victor_dmm_receive_data(sdi, transfer->buffer);
7a360375 BV	328	if (devc->limit_samples) {
	329	if (devc->num_samples >= devc->limit_samples)
	330	hw_dev_acquisition_stop(sdi, sdi);
	331	}
	332	}
	333	}
	334	/* Anything else is either an error or a timeout, which is fine:
	335	* we were just going to send another transfer request anyway. */
	336
	337	if (sdi->status == SR_ST_ACTIVE) {
	338	/* Send the same request again. */
	339	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062 UH	340	sr_err("Unable to resubmit transfer: %s.",
fa773062 UH	341	libusb_error_name(ret));
7a360375 BV	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	}
7a360375 BV	352	}
	353
	354	static int handle_events(int fd, int revents, void *cb_data)
	355	{
	356	struct dev_context *devc;
d4abb463	357	struct drv_context *drvc = di->priv;
7a360375 BV	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));
d4abb463 PS	387	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
d4abb463 PS	388	NULL);
7a360375 BV	389
	390	return TRUE;
	391	}
	392
ac3898d2 BV	393	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	394	void *cb_data)
	395	{
7a360375 BV	396	struct sr_datafeed_packet packet;
	397	struct sr_datafeed_header header;
	398	struct sr_datafeed_meta_analog meta;
	399	struct dev_context *devc;
d4abb463	400	struct drv_context *drvc = di->priv;
7a360375 BV	401	const struct libusb_pollfd **pfd;
	402	struct libusb_transfer *transfer;
	403	int ret, i;
	404	unsigned char *buf;
	405
	406	if (!di->priv) {
	407	sr_err("Driver was not initialized.");
	408	return SR_ERR;
	409	}
	410
	411	sr_dbg("Starting acquisition.");
	412
	413	devc = sdi->priv;
	414	devc->cb_data = cb_data;
	415
	416	/* Send header packet to the session bus. */
	417	sr_dbg("Sending SR_DF_HEADER.");
	418	packet.type = SR_DF_HEADER;
	419	packet.payload = (uint8_t *)&header;
	420	header.feed_version = 1;
	421	sr_session_send(devc->cb_data, &packet);
	422
	423	/* Send metadata about the SR_DF_ANALOG packets to come. */
	424	packet.type = SR_DF_META_ANALOG;
	425	packet.payload = &meta;
	426	meta.num_probes = 1;
	427	sr_session_send(devc->cb_data, &packet);
	428
d4abb463	429	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
7a360375 BV	430	for (i = 0; pfd[i]; i++) {
	431	/* Handle USB events every 100ms, for decent latency. */
	432	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	433	handle_events, (void *)sdi);
	434	/* We'll need to remove this fd later. */
	435	devc->usbfd[i] = pfd[i]->fd;
	436	}
	437	devc->usbfd[i] = -1;
	438
ff945683	439	buf = g_try_malloc(DMM_DATA_SIZE);
7a360375 BV	440	transfer = libusb_alloc_transfer(0);
	441	/* Each transfer request gets 100ms to arrive before it's restarted.
	442	* The device only sends 1 transfer/second no matter how many
	443	* times you ask, but we want to keep step with the USB events
	444	* handling above. */
	445	libusb_fill_interrupt_transfer(transfer, devc->usb->devhdl,
fa773062 UH	446	VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
fa773062 UH	447	cb_data, 100);
7a360375	448	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062	449	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
7a360375 BV	450	libusb_free_transfer(transfer);
	451	g_free(buf);
	452	return SR_ERR;
	453	}
ac3898d2 BV	454
	455	return SR_OK;
	456	}
	457
7a360375	458	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
ac3898d2 BV	459	{
	460	(void)cb_data;
	461
7a360375 BV	462	if (!di->priv) {
	463	sr_err("Driver was not initialized.");
	464	return SR_ERR;
	465	}
	466
ac3898d2	467	if (sdi->status != SR_ST_ACTIVE) {
7a360375	468	sr_err("Device not active, can't stop acquisition.");
ac3898d2 BV	469	return SR_ERR;
	470	}
	471
7a360375	472	sdi->status = SR_ST_STOPPING;
ac3898d2 BV	473
	474	return SR_OK;
	475	}
	476
	477	SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	478	.name = "victor-dmm",
7a360375	479	.longname = "Victor DMMs",
ac3898d2 BV	480	.api_version = 1,
	481	.init = hw_init,
	482	.cleanup = hw_cleanup,
	483	.scan = hw_scan,
	484	.dev_list = hw_dev_list,
	485	.dev_clear = clear_instances,
	486	.dev_open = hw_dev_open,
	487	.dev_close = hw_dev_close,
	488	.info_get = hw_info_get,
	489	.dev_config_set = hw_dev_config_set,
	490	.dev_acquisition_start = hw_dev_acquisition_start,
	491	.dev_acquisition_stop = hw_dev_acquisition_stop,
	492	.priv = NULL,
	493	};