[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;
	}
	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:
		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 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(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	}
ac3898d2 BV	87	di->priv = drvc;
	88
	89	return SR_OK;
	90	}
	91
	92	static GSList hw_scan(GSList options)
	93	{
	94	struct drv_context *drvc;
7a360375 BV	95	struct dev_context *devc;
	96	struct sr_dev_inst *sdi;
	97	struct sr_probe *probe;
	98	struct libusb_device_descriptor des;
	99	libusb_device **devlist;
ac3898d2	100	GSList *devices;
7a360375	101	int ret, devcnt, i;
ac3898d2 BV	102
	103	(void)options;
	104
7a360375 BV	105	if (!(drvc = di->priv)) {
	106	sr_err("Driver was not initialized.");
	107	return NULL;
	108	}
	109
	110	/* USB scan is always authoritative. */
	111	clear_instances();
	112
ac3898d2	113	devices = NULL;
7a360375 BV	114	libusb_get_device_list(NULL, &devlist);
	115	for (i = 0; devlist[i]; i++) {
	116	if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
	117	sr_warn("Failed to get device descriptor: %s",
	118	libusb_error_name(ret));
	119	continue;
	120	}
ac3898d2	121
7a360375 BV	122	if (des.idVendor != VICTOR_VID \|\| des.idProduct != VICTOR_PID)
	123	continue;
	124
	125	devcnt = g_slist_length(drvc->instances);
fa773062 UH	126	if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
fa773062 UH	127	VICTOR_VENDOR, NULL, NULL)))
7a360375 BV	128	return NULL;
	129	sdi->driver = di;
	130
	131	if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
	132	return NULL;
	133	sdi->priv = devc;
	134
	135	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	136	return NULL;
	137	sdi->probes = g_slist_append(NULL, probe);
	138
	139	if (!(devc->usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
	140	libusb_get_device_address(devlist[i]), NULL)))
	141	return NULL;
	142
	143	drvc->instances = g_slist_append(drvc->instances, sdi);
	144	devices = g_slist_append(devices, sdi);
	145	}
	146	libusb_free_device_list(devlist, 1);
ac3898d2 BV	147
	148	return devices;
	149	}
	150
	151	static GSList *hw_dev_list(void)
	152	{
	153	struct drv_context *drvc;
	154
7a360375 BV	155	if (!(drvc = di->priv)) {
	156	sr_err("Driver was not initialized.");
	157	return NULL;
	158	}
ac3898d2 BV	159
	160	return drvc->instances;
	161	}
	162
	163	static int hw_dev_open(struct sr_dev_inst *sdi)
	164	{
7a360375 BV	165	struct dev_context *devc;
	166	libusb_device **devlist;
	167	int ret, i;
	168
	169	if (!di->priv) {
	170	sr_err("Driver was not initialized.");
	171	return SR_ERR;
	172	}
	173
	174	devc = sdi->priv;
	175	libusb_get_device_list(NULL, &devlist);
	176	for (i = 0; devlist[i]; i++) {
	177	if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
	178	\|\| libusb_get_device_address(devlist[i]) != devc->usb->address)
	179	continue;
	180	if ((ret = libusb_open(devlist[i], &devc->usb->devhdl))) {
fa773062	181	sr_err("Failed to open device: %s.", libusb_error_name(ret));
7a360375 BV	182	return SR_ERR;
	183	}
	184	break;
	185	}
	186	libusb_free_device_list(devlist, 1);
	187	if (!devlist[i]) {
	188	sr_err("Device not found.");
	189	return SR_ERR;
	190	}
	191
	192	/* The device reports as HID class, so the kernel would have
	193	* claimed it. */
	194	if (libusb_kernel_driver_active(devc->usb->devhdl, 0) == 1) {
	195	if (libusb_detach_kernel_driver(devc->usb->devhdl, 0) < 0) {
	196	sr_err("Failed to detach kernel driver.");
	197	return SR_ERR;
	198	}
	199	}
	200
	201	if ((ret = libusb_claim_interface(devc->usb->devhdl,
	202	VICTOR_INTERFACE))) {
fa773062	203	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
7a360375 BV	204	return SR_ERR;
	205	}
	206	sdi->status = SR_ST_ACTIVE;
ac3898d2 BV	207
	208	return SR_OK;
	209	}
	210
	211	static int hw_dev_close(struct sr_dev_inst *sdi)
	212	{
7a360375 BV	213	struct dev_context *devc;
	214
	215	if (!di->priv) {
	216	sr_err("Driver was not initialized.");
	217	return SR_ERR;
	218	}
	219
	220	devc = sdi->priv;
	221	if (!devc->usb->devhdl)
	222	/* Nothing to do. */
	223	return SR_OK;
	224
	225	libusb_release_interface(devc->usb->devhdl, VICTOR_INTERFACE);
	226	libusb_close(devc->usb->devhdl);
	227	devc->usb->devhdl = NULL;
	228	sdi->status = SR_ST_INACTIVE;
ac3898d2 BV	229
	230	return SR_OK;
	231	}
	232
	233	static int hw_cleanup(void)
	234	{
7a360375 BV	235	struct drv_context *drvc;
	236
	237	if (!(drvc = di->priv))
	238	/* Can get called on an unused driver, doesn't matter. */
	239	return SR_OK;
ac3898d2	240
7a360375 BV	241	clear_instances();
	242	g_free(drvc);
	243	di->priv = NULL;
ac3898d2 BV	244
	245	return SR_OK;
	246	}
	247
	248	static int hw_info_get(int info_id, const void **data,
	249	const struct sr_dev_inst *sdi)
	250	{
7a360375 BV	251	(void)sdi;
7a360375 BV	252
ac3898d2	253	switch (info_id) {
fa773062 UH	254	case SR_DI_HWCAPS:
	255	*data = hwcaps;
	256	break;
	257	case SR_DI_NUM_PROBES:
	258	*data = GINT_TO_POINTER(1);
	259	break;
	260	case SR_DI_PROBE_NAMES:
	261	*data = probe_names;
	262	break;
	263	default:
	264	sr_err("Unknown info_id: %d.", info_id);
	265	return SR_ERR_ARG;
ac3898d2 BV	266	}
	267
	268	return SR_OK;
	269	}
	270
	271	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	272	const void *value)
	273	{
7a360375 BV	274	struct dev_context *devc;
7a360375 BV	275	gint64 now;
ac3898d2 BV	276	int ret;
ac3898d2 BV	277
7a360375 BV	278	if (!di->priv) {
	279	sr_err("Driver was not initialized.");
	280	return SR_ERR;
	281	}
	282
ac3898d2 BV	283	if (sdi->status != SR_ST_ACTIVE) {
	284	sr_err("Device inactive, can't set config options.");
	285	return SR_ERR;
	286	}
	287
7a360375	288	devc = sdi->priv;
ac3898d2 BV	289	ret = SR_OK;
ac3898d2 BV	290	switch (hwcap) {
fa773062 UH	291	case SR_HWCAP_LIMIT_MSEC:
	292	devc->limit_msec = (const int64_t )value;
	293	now = g_get_monotonic_time() / 1000;
	294	devc->end_time = now + devc->limit_msec;
	295	sr_dbg("Setting time limit to %" PRIu64 "ms.",
	296	devc->limit_msec);
	297	break;
	298	case SR_HWCAP_LIMIT_SAMPLES:
	299	devc->limit_samples = (const uint64_t )value;
	300	sr_dbg("Setting sample limit to %" PRIu64 ".",
	301	devc->limit_samples);
	302	break;
ac3898d2 BV	303	default:
	304	sr_err("Unknown hardware capability: %d.", hwcap);
	305	ret = SR_ERR_ARG;
	306	}
	307
	308	return ret;
	309	}
	310
7a360375 BV	311	static void receive_transfer(struct libusb_transfer *transfer)
	312	{
	313	struct dev_context *devc;
	314	struct sr_dev_inst *sdi;
	315	int ret;
	316
	317	sdi = transfer->user_data;
	318	devc = sdi->priv;
	319	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	320	/* USB device was unplugged. */
	321	hw_dev_acquisition_stop(sdi, sdi);
	322	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
fa773062	323	sr_dbg("Got %d-byte packet.", transfer->actual_length);
ff945683 BV	324	if (transfer->actual_length == DMM_DATA_SIZE) {
ff945683 BV	325	victor_dmm_receive_data(sdi, transfer->buffer);
7a360375 BV	326	if (devc->limit_samples) {
	327	if (devc->num_samples >= devc->limit_samples)
	328	hw_dev_acquisition_stop(sdi, sdi);
	329	}
	330	}
	331	}
	332	/* Anything else is either an error or a timeout, which is fine:
	333	* we were just going to send another transfer request anyway. */
	334
	335	if (sdi->status == SR_ST_ACTIVE) {
	336	/* Send the same request again. */
	337	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062 UH	338	sr_err("Unable to resubmit transfer: %s.",
fa773062 UH	339	libusb_error_name(ret));
7a360375 BV	340	libusb_free_transfer(transfer);
	341	g_free(transfer->buffer);
	342	hw_dev_acquisition_stop(sdi, sdi);
	343	}
	344	} else {
	345	/* This was the last transfer we're going to receive, so
	346	* clean up now. */
	347	libusb_free_transfer(transfer);
	348	g_free(transfer->buffer);
	349	}
7a360375 BV	350	}
	351
	352	static int handle_events(int fd, int revents, void *cb_data)
	353	{
	354	struct dev_context *devc;
	355	struct sr_datafeed_packet packet;
	356	struct sr_dev_inst *sdi;
	357	struct timeval tv;
	358	gint64 now;
	359	int i;
	360
	361	(void)fd;
	362	(void)revents;
	363
	364	sdi = cb_data;
	365	devc = sdi->priv;
	366
	367	if (devc->limit_msec) {
	368	now = g_get_monotonic_time() / 1000;
	369	if (now > devc->end_time)
	370	hw_dev_acquisition_stop(sdi, sdi);
	371	}
	372
	373	if (sdi->status == SR_ST_STOPPING) {
	374	for (i = 0; devc->usbfd[i] != -1; i++)
	375	sr_source_remove(devc->usbfd[i]);
	376
	377	hw_dev_close(sdi);
	378
	379	packet.type = SR_DF_END;
	380	sr_session_send(cb_data, &packet);
	381	}
	382
	383	memset(&tv, 0, sizeof(struct timeval));
	384	libusb_handle_events_timeout_completed(NULL, &tv, NULL);
	385
	386	return TRUE;
	387	}
	388
ac3898d2 BV	389	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	390	void *cb_data)
	391	{
7a360375 BV	392	struct sr_datafeed_packet packet;
	393	struct sr_datafeed_header header;
	394	struct sr_datafeed_meta_analog meta;
	395	struct dev_context *devc;
	396	const struct libusb_pollfd **pfd;
	397	struct libusb_transfer *transfer;
	398	int ret, i;
	399	unsigned char *buf;
	400
	401	if (!di->priv) {
	402	sr_err("Driver was not initialized.");
	403	return SR_ERR;
	404	}
	405
	406	sr_dbg("Starting acquisition.");
	407
	408	devc = sdi->priv;
	409	devc->cb_data = cb_data;
	410
	411	/* Send header packet to the session bus. */
	412	sr_dbg("Sending SR_DF_HEADER.");
	413	packet.type = SR_DF_HEADER;
	414	packet.payload = (uint8_t *)&header;
	415	header.feed_version = 1;
	416	sr_session_send(devc->cb_data, &packet);
	417
	418	/* Send metadata about the SR_DF_ANALOG packets to come. */
	419	packet.type = SR_DF_META_ANALOG;
	420	packet.payload = &meta;
	421	meta.num_probes = 1;
	422	sr_session_send(devc->cb_data, &packet);
	423
	424	pfd = libusb_get_pollfds(NULL);
	425	for (i = 0; pfd[i]; i++) {
	426	/* Handle USB events every 100ms, for decent latency. */
	427	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	428	handle_events, (void *)sdi);
	429	/* We'll need to remove this fd later. */
	430	devc->usbfd[i] = pfd[i]->fd;
	431	}
	432	devc->usbfd[i] = -1;
	433
ff945683	434	buf = g_try_malloc(DMM_DATA_SIZE);
7a360375 BV	435	transfer = libusb_alloc_transfer(0);
	436	/* Each transfer request gets 100ms to arrive before it's restarted.
	437	* The device only sends 1 transfer/second no matter how many
	438	* times you ask, but we want to keep step with the USB events
	439	* handling above. */
	440	libusb_fill_interrupt_transfer(transfer, devc->usb->devhdl,
fa773062 UH	441	VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
fa773062 UH	442	cb_data, 100);
7a360375	443	if ((ret = libusb_submit_transfer(transfer) != 0)) {
fa773062	444	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
7a360375 BV	445	libusb_free_transfer(transfer);
	446	g_free(buf);
	447	return SR_ERR;
	448	}
ac3898d2 BV	449
	450	return SR_OK;
	451	}
	452
7a360375	453	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
ac3898d2 BV	454	{
	455	(void)cb_data;
	456
7a360375 BV	457	if (!di->priv) {
	458	sr_err("Driver was not initialized.");
	459	return SR_ERR;
	460	}
	461
ac3898d2	462	if (sdi->status != SR_ST_ACTIVE) {
7a360375	463	sr_err("Device not active, can't stop acquisition.");
ac3898d2 BV	464	return SR_ERR;
	465	}
	466
7a360375	467	sdi->status = SR_ST_STOPPING;
ac3898d2 BV	468
	469	return SR_OK;
	470	}
	471
	472	SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
	473	.name = "victor-dmm",
7a360375	474	.longname = "Victor DMMs",
ac3898d2 BV	475	.api_version = 1,
	476	.init = hw_init,
	477	.cleanup = hw_cleanup,
	478	.scan = hw_scan,
	479	.dev_list = hw_dev_list,
	480	.dev_clear = clear_instances,
	481	.dev_open = hw_dev_open,
	482	.dev_close = hw_dev_close,
	483	.info_get = hw_info_get,
	484	.dev_config_set = hw_dev_config_set,
	485	.dev_acquisition_start = hw_dev_acquisition_start,
	486	.dev_acquisition_stop = hw_dev_acquisition_stop,
	487	.priv = NULL,
	488	};