[libsigrok.git] / src / hardware / testo / api.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2014 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 <config.h>
#include <string.h>
#include "protocol.h"

#define SERIALCOMM "115200/8n1"

static const uint32_t scanopts[] = {
	SR_CONF_CONN,
};

static const uint32_t devopts[] = {
	SR_CONF_MULTIMETER,
	SR_CONF_CONTINUOUS,
	SR_CONF_LIMIT_SAMPLES | SR_CONF_SET | SR_CONF_GET,
	SR_CONF_LIMIT_MSEC | SR_CONF_SET | SR_CONF_GET,
};

static const uint8_t TESTO_x35_REQUEST[] = { 0x12, 0, 0, 0, 1, 1, 0x55, 0xd1, 0xb7 };

static const struct testo_model models[] = {
	{ "435", 9, TESTO_x35_REQUEST },
};

static GSList *scan(struct sr_dev_driver *di, GSList *options)
{
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_config *src;
	struct sr_dev_inst *sdi;
	struct sr_usb_dev_inst *usb;
	struct libusb_device_descriptor des;
	libusb_device **devlist;
	struct libusb_device_handle *hdl;
	GSList *conn_devices, *devices, *l;
	int ret, i;
	const char *str;
	char manufacturer[64], product[64], connection_id[64];

	devices = NULL;
	drvc = di->context;

	conn_devices = NULL;
	for (l = options; l; l = l->next) {
		src = l->data;
		if (src->key != SR_CONF_CONN)
			continue;
		str = g_variant_get_string(src->data, NULL);
		conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, str);
	}

	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	for (i = 0; devlist[i]; i++) {
		if (conn_devices) {
			usb = NULL;
			for (l = conn_devices; l; l = l->next) {
				usb = l->data;
				if (usb->bus == libusb_get_bus_number(devlist[i])
					&& usb->address == libusb_get_device_address(devlist[i]))
					break;
			}
			if (!l)
				/* This device matched none of the ones that
				 * matched the conn specification. */
				continue;
		}

		libusb_get_device_descriptor(devlist[i], &des);

		if ((ret = libusb_open(devlist[i], &hdl)) < 0)
			continue;

		manufacturer[0] = product[0] = '\0';
		if (des.iManufacturer && (ret = libusb_get_string_descriptor_ascii(
				hdl, des.iManufacturer, (unsigned char *) manufacturer,
				sizeof(manufacturer))) < 0) {
			sr_warn("Failed to get manufacturer string descriptor: %s.",
				libusb_error_name(ret));
		}
		if (des.iProduct && (ret = libusb_get_string_descriptor_ascii(
				hdl, des.iProduct, (unsigned char *) product,
				sizeof(product))) < 0) {
			sr_warn("Failed to get product string descriptor: %s.",
				libusb_error_name(ret));
		}
		libusb_close(hdl);

		if (strncmp(manufacturer, "testo", 5))
			continue;

		usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));

		/* Hardcode the 435 for now.*/
		if (strcmp(product, "testo 435/635/735"))
			continue;

		sdi = g_malloc0(sizeof(struct sr_dev_inst));
		sdi->status = SR_ST_INACTIVE;
		sdi->vendor = g_strdup("Testo");
		sdi->model = g_strdup("435/635/735");
		sdi->driver = di;
		sdi->inst_type = SR_INST_USB;
		sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
				libusb_get_device_address(devlist[i]), NULL);
		sdi->connection_id = g_strdup(connection_id);
		devc = g_malloc(sizeof(struct dev_context));
		devc->model = &models[0];
		sr_sw_limits_init(&devc->sw_limits);
		sdi->priv = devc;
		if (testo_probe_channels(sdi) != SR_OK)
			continue;
		devices = g_slist_append(devices, sdi);
	}
	libusb_free_device_list(devlist, 1);
	g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);

	return std_scan_complete(di, devices);
}

static int dev_open(struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di = sdi->driver;
	struct drv_context *drvc = di->context;
	struct sr_usb_dev_inst *usb;
	int ret;

	usb = sdi->conn;

	ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
	if (ret != SR_OK)
		return ret;

	if (libusb_has_capability(LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER)) {
		if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
			if ((ret = libusb_detach_kernel_driver(usb->devhdl, 0)) < 0) {
				sr_err("Failed to detach kernel driver: %s.",
					   libusb_error_name(ret));
				return SR_ERR;
			}
		}
	}

	if ((ret = libusb_claim_interface(usb->devhdl, 0))) {
		sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
		return SR_ERR;
	}

	return SR_OK;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	struct sr_usb_dev_inst *usb;

	usb = sdi->conn;

	if (!usb->devhdl)
		return SR_ERR_BUG;

	libusb_release_interface(usb->devhdl, 0);
	libusb_close(usb->devhdl);
	usb->devhdl = NULL;

	return SR_OK;
}

static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc = sdi->priv;
	struct sr_usb_dev_inst *usb;
	char str[128];

	(void)cg;

	switch (key) {
	case SR_CONF_CONN:
		if (!sdi || !sdi->conn)
			return SR_ERR_ARG;
		usb = sdi->conn;
		snprintf(str, 128, "%d.%d", usb->bus, usb->address);
		*data = g_variant_new_string(str);
		break;
	case SR_CONF_LIMIT_MSEC:
	case SR_CONF_LIMIT_SAMPLES:
		return sr_sw_limits_config_get(&devc->sw_limits, key, data);
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc = sdi->priv;

	(void)cg;

	return sr_sw_limits_config_set(&devc->sw_limits, key, data);
}

static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	(void)sdi;
	(void)cg;

	switch (key) {
	case SR_CONF_SCAN_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
				scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
		break;
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
				devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static void receive_data(struct sr_dev_inst *sdi, unsigned char *data, int len)
{
	struct dev_context *devc;
	int packet_size;
	uint16_t crc;

	devc = sdi->priv;

	if (devc->reply_size + len > MAX_REPLY_SIZE) {
		/* Something went very wrong. */
		sr_dbg("Receive buffer overrun.");
		devc->reply_size = 0;
		return;
	}

	memcpy(devc->reply + devc->reply_size, data, len);
	devc->reply_size += len;
	/* Sixth byte contains the length of the packet. */
	if (devc->reply_size < 7)
		return;

	packet_size = 7 + devc->reply[6] * 7 + 2;
	if (devc->reply_size < packet_size)
		return;

	if (!testo_check_packet_prefix(devc->reply, devc->reply_size))
		return;

	crc = crc16_mcrf4xx(0xffff, devc->reply, devc->reply_size - 2);
	if (crc == RL16(&devc->reply[devc->reply_size - 2])) {
		testo_receive_packet(sdi);
		sr_sw_limits_update_samples_read(&devc->sw_limits, 1);
	} else {
		sr_dbg("Packet has invalid CRC.");
	}

	devc->reply_size = 0;
	if (sr_sw_limits_check(&devc->sw_limits))
		sr_dev_acquisition_stop(sdi);
	else
		testo_request_packet(sdi);

}

SR_PRIV void LIBUSB_CALL 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 == devc->out_transfer)
		/* Just the command acknowledgement. */
		return;

	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
		/* USB device was unplugged. */
		sr_dev_acquisition_stop(sdi);
	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
		/* First two bytes in any transfer are FTDI status bytes. */
		if (transfer->actual_length > 2)
			receive_data(sdi, transfer->buffer + 2, transfer->actual_length - 2);
	}
	/* 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) {
		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);
			sr_dev_acquisition_stop(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 sr_dev_driver *di;
	struct dev_context *devc;
	struct drv_context *drvc;
	struct sr_dev_inst *sdi;
	struct timeval tv;

	(void)fd;
	(void)revents;

	sdi = cb_data;
	devc = sdi->priv;
	di = sdi->driver;
	drvc = di->context;

	if (sr_sw_limits_check(&devc->sw_limits))
		sr_dev_acquisition_stop(sdi);

	if (sdi->status == SR_ST_STOPPING) {
		usb_source_remove(sdi->session, drvc->sr_ctx);
		dev_close(sdi);
		std_session_send_df_end(sdi);
	}

	memset(&tv, 0, sizeof(struct timeval));
	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
			NULL);

	return TRUE;
}

static int dev_acquisition_start(const struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di = sdi->driver;
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_usb_dev_inst *usb;
	struct libusb_transfer *transfer;
	int ret;
	unsigned char *buf;

	drvc = di->context;
	devc = sdi->priv;
	usb = sdi->conn;
	devc->reply_size = 0;

	std_session_send_df_header(sdi);

	usb_source_add(sdi->session, drvc->sr_ctx, 100,
			handle_events, (void *)sdi);

	if (testo_set_serial_params(usb) != SR_OK)
		return SR_ERR;

	devc->out_transfer = libusb_alloc_transfer(0);
	if (testo_request_packet(sdi) != SR_OK)
		return SR_ERR;

	buf = g_malloc(MAX_REPLY_SIZE);
	transfer = libusb_alloc_transfer(0);
	libusb_fill_bulk_transfer(transfer, usb->devhdl, EP_IN, buf,
			MAX_REPLY_SIZE, receive_transfer, (void *)sdi, 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;
	}
	devc->reply_size = 0;

	sr_sw_limits_acquisition_start(&devc->sw_limits);

	return SR_OK;
}

static int dev_acquisition_stop(struct sr_dev_inst *sdi)
{
	sdi->status = SR_ST_STOPPING;

	return SR_OK;
}

static struct sr_dev_driver testo_driver_info = {
	.name = "testo",
	.longname = "Testo",
	.api_version = 1,
	.init = std_init,
	.cleanup = std_cleanup,
	.scan = scan,
	.dev_list = std_dev_list,
	.dev_clear = std_dev_clear,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list,
	.dev_open = dev_open,
	.dev_close = dev_close,
	.dev_acquisition_start = dev_acquisition_start,
	.dev_acquisition_stop = dev_acquisition_stop,
	.context = NULL,
};
SR_REGISTER_DEV_DRIVER(testo_driver_info);
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2014 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 <config.h>
	21	#include <string.h>
	22	#include "protocol.h"
	23
	24	#define SERIALCOMM "115200/8n1"
	25
	26	static const uint32_t scanopts[] = {
	27	SR_CONF_CONN,
	28	};
	29
	30	static const uint32_t devopts[] = {
	31	SR_CONF_MULTIMETER,
	32	SR_CONF_CONTINUOUS,
	33	SR_CONF_LIMIT_SAMPLES \| SR_CONF_SET \| SR_CONF_GET,
	34	SR_CONF_LIMIT_MSEC \| SR_CONF_SET \| SR_CONF_GET,
	35	};
	36
	37	static const uint8_t TESTO_x35_REQUEST[] = { 0x12, 0, 0, 0, 1, 1, 0x55, 0xd1, 0xb7 };
	38
	39	static const struct testo_model models[] = {
	40	{ "435", 9, TESTO_x35_REQUEST },
	41	};
	42
	43	static GSList scan(struct sr_dev_driver di, GSList *options)
	44	{
	45	struct drv_context *drvc;
	46	struct dev_context *devc;
	47	struct sr_config *src;
	48	struct sr_dev_inst *sdi;
	49	struct sr_usb_dev_inst *usb;
	50	struct libusb_device_descriptor des;
	51	libusb_device **devlist;
	52	struct libusb_device_handle *hdl;
	53	GSList conn_devices, devices, *l;
	54	int ret, i;
	55	const char *str;
	56	char manufacturer[64], product[64], connection_id[64];
	57
	58	devices = NULL;
	59	drvc = di->context;
	60
	61	conn_devices = NULL;
	62	for (l = options; l; l = l->next) {
	63	src = l->data;
	64	if (src->key != SR_CONF_CONN)
	65	continue;
	66	str = g_variant_get_string(src->data, NULL);
	67	conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, str);
	68	}
	69
	70	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	71	for (i = 0; devlist[i]; i++) {
	72	if (conn_devices) {
	73	usb = NULL;
	74	for (l = conn_devices; l; l = l->next) {
	75	usb = l->data;
	76	if (usb->bus == libusb_get_bus_number(devlist[i])
	77	&& usb->address == libusb_get_device_address(devlist[i]))
	78	break;
	79	}
	80	if (!l)
	81	/* This device matched none of the ones that
	82	* matched the conn specification. */
	83	continue;
	84	}
	85
	86	libusb_get_device_descriptor(devlist[i], &des);
	87
	88	if ((ret = libusb_open(devlist[i], &hdl)) < 0)
	89	continue;
	90
	91	manufacturer[0] = product[0] = '\0';
	92	if (des.iManufacturer && (ret = libusb_get_string_descriptor_ascii(
	93	hdl, des.iManufacturer, (unsigned char *) manufacturer,
	94	sizeof(manufacturer))) < 0) {
	95	sr_warn("Failed to get manufacturer string descriptor: %s.",
	96	libusb_error_name(ret));
	97	}
	98	if (des.iProduct && (ret = libusb_get_string_descriptor_ascii(
	99	hdl, des.iProduct, (unsigned char *) product,
	100	sizeof(product))) < 0) {
	101	sr_warn("Failed to get product string descriptor: %s.",
	102	libusb_error_name(ret));
	103	}
	104	libusb_close(hdl);
	105
	106	if (strncmp(manufacturer, "testo", 5))
	107	continue;
	108
	109	usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
	110
	111	/* Hardcode the 435 for now.*/
	112	if (strcmp(product, "testo 435/635/735"))
	113	continue;
	114
	115	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	116	sdi->status = SR_ST_INACTIVE;
	117	sdi->vendor = g_strdup("Testo");
	118	sdi->model = g_strdup("435/635/735");
	119	sdi->driver = di;
	120	sdi->inst_type = SR_INST_USB;
	121	sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
	122	libusb_get_device_address(devlist[i]), NULL);
	123	sdi->connection_id = g_strdup(connection_id);
	124	devc = g_malloc(sizeof(struct dev_context));
	125	devc->model = &models[0];
	126	sr_sw_limits_init(&devc->sw_limits);
	127	sdi->priv = devc;
	128	if (testo_probe_channels(sdi) != SR_OK)
	129	continue;
	130	devices = g_slist_append(devices, sdi);
	131	}
	132	libusb_free_device_list(devlist, 1);
	133	g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
	134
	135	return std_scan_complete(di, devices);
	136	}
	137
	138	static int dev_open(struct sr_dev_inst *sdi)
	139	{
	140	struct sr_dev_driver *di = sdi->driver;
	141	struct drv_context *drvc = di->context;
	142	struct sr_usb_dev_inst *usb;
	143	int ret;
	144
	145	usb = sdi->conn;
	146
	147	ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
	148	if (ret != SR_OK)
	149	return ret;
	150
	151	if (libusb_has_capability(LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER)) {
	152	if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
	153	if ((ret = libusb_detach_kernel_driver(usb->devhdl, 0)) < 0) {
	154	sr_err("Failed to detach kernel driver: %s.",
	155	libusb_error_name(ret));
	156	return SR_ERR;
	157	}
	158	}
	159	}
	160
	161	if ((ret = libusb_claim_interface(usb->devhdl, 0))) {
	162	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	163	return SR_ERR;
	164	}
	165
	166	return SR_OK;
	167	}
	168
	169	static int dev_close(struct sr_dev_inst *sdi)
	170	{
	171	struct sr_usb_dev_inst *usb;
	172
	173	usb = sdi->conn;
	174
	175	if (!usb->devhdl)
	176	return SR_ERR_BUG;
	177
	178	libusb_release_interface(usb->devhdl, 0);
	179	libusb_close(usb->devhdl);
	180	usb->devhdl = NULL;
	181
	182	return SR_OK;
	183	}
	184
	185	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	186	const struct sr_channel_group *cg)
	187	{
	188	struct dev_context *devc = sdi->priv;
	189	struct sr_usb_dev_inst *usb;
	190	char str[128];
	191
	192	(void)cg;
	193
	194	switch (key) {
	195	case SR_CONF_CONN:
	196	if (!sdi \|\| !sdi->conn)
	197	return SR_ERR_ARG;
	198	usb = sdi->conn;
	199	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	200	*data = g_variant_new_string(str);
	201	break;
	202	case SR_CONF_LIMIT_MSEC:
	203	case SR_CONF_LIMIT_SAMPLES:
	204	return sr_sw_limits_config_get(&devc->sw_limits, key, data);
	205	default:
	206	return SR_ERR_NA;
	207	}
	208
	209	return SR_OK;
	210	}
	211
	212	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
	213	const struct sr_channel_group *cg)
	214	{
	215	struct dev_context *devc = sdi->priv;
	216
	217	(void)cg;
	218
	219	return sr_sw_limits_config_set(&devc->sw_limits, key, data);
	220	}
	221
	222	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	223	const struct sr_channel_group *cg)
	224	{
	225	(void)sdi;
	226	(void)cg;
	227
	228	switch (key) {
	229	case SR_CONF_SCAN_OPTIONS:
	230	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	231	scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
	232	break;
	233	case SR_CONF_DEVICE_OPTIONS:
	234	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	235	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
	236	break;
	237	default:
	238	return SR_ERR_NA;
	239	}
	240
	241	return SR_OK;
	242	}
	243
	244	static void receive_data(struct sr_dev_inst sdi, unsigned char data, int len)
	245	{
	246	struct dev_context *devc;
	247	int packet_size;
	248	uint16_t crc;
	249
	250	devc = sdi->priv;
	251
	252	if (devc->reply_size + len > MAX_REPLY_SIZE) {
	253	/* Something went very wrong. */
	254	sr_dbg("Receive buffer overrun.");
	255	devc->reply_size = 0;
	256	return;
	257	}
	258
	259	memcpy(devc->reply + devc->reply_size, data, len);
	260	devc->reply_size += len;
	261	/* Sixth byte contains the length of the packet. */
	262	if (devc->reply_size < 7)
	263	return;
	264
	265	packet_size = 7 + devc->reply[6] * 7 + 2;
	266	if (devc->reply_size < packet_size)
	267	return;
	268
	269	if (!testo_check_packet_prefix(devc->reply, devc->reply_size))
	270	return;
	271
	272	crc = crc16_mcrf4xx(0xffff, devc->reply, devc->reply_size - 2);
	273	if (crc == RL16(&devc->reply[devc->reply_size - 2])) {
	274	testo_receive_packet(sdi);
	275	sr_sw_limits_update_samples_read(&devc->sw_limits, 1);
	276	} else {
	277	sr_dbg("Packet has invalid CRC.");
	278	}
	279
	280	devc->reply_size = 0;
	281	if (sr_sw_limits_check(&devc->sw_limits))
	282	sr_dev_acquisition_stop(sdi);
	283	else
	284	testo_request_packet(sdi);
	285
	286	}
	287
	288	SR_PRIV void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
	289	{
	290	struct dev_context *devc;
	291	struct sr_dev_inst *sdi;
	292	int ret;
	293
	294	sdi = transfer->user_data;
	295	devc = sdi->priv;
	296	if (transfer == devc->out_transfer)
	297	/* Just the command acknowledgement. */
	298	return;
	299
	300	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	301	/* USB device was unplugged. */
	302	sr_dev_acquisition_stop(sdi);
	303	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
	304	/* First two bytes in any transfer are FTDI status bytes. */
	305	if (transfer->actual_length > 2)
	306	receive_data(sdi, transfer->buffer + 2, transfer->actual_length - 2);
	307	}
	308	/* Anything else is either an error or a timeout, which is fine:
	309	* we were just going to send another transfer request anyway. */
	310
	311	if (sdi->status == SR_ST_ACTIVE) {
	312	if ((ret = libusb_submit_transfer(transfer) != 0)) {
	313	sr_err("Unable to resubmit transfer: %s.",
	314	libusb_error_name(ret));
	315	g_free(transfer->buffer);
	316	libusb_free_transfer(transfer);
	317	sr_dev_acquisition_stop(sdi);
	318	}
	319	} else {
	320	/* This was the last transfer we're going to receive, so
	321	* clean up now. */
	322	g_free(transfer->buffer);
	323	libusb_free_transfer(transfer);
	324	}
	325	}
	326
	327	static int handle_events(int fd, int revents, void *cb_data)
	328	{
	329	struct sr_dev_driver *di;
	330	struct dev_context *devc;
	331	struct drv_context *drvc;
	332	struct sr_dev_inst *sdi;
	333	struct timeval tv;
	334
	335	(void)fd;
	336	(void)revents;
	337
	338	sdi = cb_data;
	339	devc = sdi->priv;
	340	di = sdi->driver;
	341	drvc = di->context;
	342
	343	if (sr_sw_limits_check(&devc->sw_limits))
	344	sr_dev_acquisition_stop(sdi);
	345
	346	if (sdi->status == SR_ST_STOPPING) {
	347	usb_source_remove(sdi->session, drvc->sr_ctx);
	348	dev_close(sdi);
	349	std_session_send_df_end(sdi);
	350	}
	351
	352	memset(&tv, 0, sizeof(struct timeval));
	353	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
	354	NULL);
	355
	356	return TRUE;
	357	}
	358
	359	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	360	{
	361	struct sr_dev_driver *di = sdi->driver;
	362	struct drv_context *drvc;
	363	struct dev_context *devc;
	364	struct sr_usb_dev_inst *usb;
	365	struct libusb_transfer *transfer;
	366	int ret;
	367	unsigned char *buf;
	368
	369	drvc = di->context;
	370	devc = sdi->priv;
	371	usb = sdi->conn;
	372	devc->reply_size = 0;
	373
	374	std_session_send_df_header(sdi);
	375
	376	usb_source_add(sdi->session, drvc->sr_ctx, 100,
	377	handle_events, (void *)sdi);
	378
	379	if (testo_set_serial_params(usb) != SR_OK)
	380	return SR_ERR;
	381
	382	devc->out_transfer = libusb_alloc_transfer(0);
	383	if (testo_request_packet(sdi) != SR_OK)
	384	return SR_ERR;
	385
	386	buf = g_malloc(MAX_REPLY_SIZE);
	387	transfer = libusb_alloc_transfer(0);
	388	libusb_fill_bulk_transfer(transfer, usb->devhdl, EP_IN, buf,
	389	MAX_REPLY_SIZE, receive_transfer, (void *)sdi, 100);
	390	if ((ret = libusb_submit_transfer(transfer) != 0)) {
	391	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	392	libusb_free_transfer(transfer);
	393	g_free(buf);
	394	return SR_ERR;
	395	}
	396	devc->reply_size = 0;
	397
	398	sr_sw_limits_acquisition_start(&devc->sw_limits);
	399
	400	return SR_OK;
	401	}
	402
	403	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	404	{
	405	sdi->status = SR_ST_STOPPING;
	406
	407	return SR_OK;
	408	}
	409
	410	static struct sr_dev_driver testo_driver_info = {
	411	.name = "testo",
	412	.longname = "Testo",
	413	.api_version = 1,
	414	.init = std_init,
	415	.cleanup = std_cleanup,
	416	.scan = scan,
	417	.dev_list = std_dev_list,
	418	.dev_clear = std_dev_clear,
	419	.config_get = config_get,
	420	.config_set = config_set,
	421	.config_list = config_list,
	422	.dev_open = dev_open,
	423	.dev_close = dev_close,
	424	.dev_acquisition_start = dev_acquisition_start,
	425	.dev_acquisition_stop = dev_acquisition_stop,
	426	.context = NULL,
	427	};
	428	SR_REGISTER_DEV_DRIVER(testo_driver_info);