[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"

SR_PRIV struct sr_dev_driver testo_driver_info;
static int dev_acquisition_stop(struct sr_dev_inst *sdi);

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;
	drvc->instances = NULL;

	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;
		drvc->instances = g_slist_append(drvc->instances, sdi);
		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 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;
	}
	sdi->status = SR_ST_ACTIVE;

	return SR_OK;
}

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

	usb = sdi->conn;
	if (!usb->devhdl)
		/*  Nothing to do. */
		return SR_OK;

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

	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;

	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

	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))
		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. */
		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);
			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))
		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, LOG_PREFIX);
	}

	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;
	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;


	devc = sdi->priv;
	usb = sdi->conn;
	devc->reply_size = 0;

	std_session_send_df_header(sdi, LOG_PREFIX);

	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)
{
	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

	sdi->status = SR_ST_STOPPING;

	return SR_OK;
}

SR_PRIV 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,
	.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,
};
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	SR_PRIV struct sr_dev_driver testo_driver_info;
	27	static int dev_acquisition_stop(struct sr_dev_inst *sdi);
	28
	29	static const uint32_t scanopts[] = {
	30	SR_CONF_CONN,
	31	};
	32
	33	static const uint32_t devopts[] = {
	34	SR_CONF_MULTIMETER,
	35	SR_CONF_CONTINUOUS,
	36	SR_CONF_LIMIT_SAMPLES \| SR_CONF_SET \| SR_CONF_GET,
	37	SR_CONF_LIMIT_MSEC \| SR_CONF_SET \| SR_CONF_GET,
	38	};
	39
	40	static const uint8_t TESTO_x35_REQUEST[] = { 0x12, 0, 0, 0, 1, 1, 0x55, 0xd1, 0xb7 };
	41
	42	static const struct testo_model models[] = {
	43	{ "435", 9, TESTO_x35_REQUEST },
	44	};
	45
	46	static GSList scan(struct sr_dev_driver di, GSList *options)
	47	{
	48	struct drv_context *drvc;
	49	struct dev_context *devc;
	50	struct sr_config *src;
	51	struct sr_dev_inst *sdi;
	52	struct sr_usb_dev_inst *usb;
	53	struct libusb_device_descriptor des;
	54	libusb_device **devlist;
	55	struct libusb_device_handle *hdl;
	56	GSList conn_devices, devices, *l;
	57	int ret, i;
	58	const char *str;
	59	char manufacturer[64], product[64], connection_id[64];
	60
	61	devices = NULL;
	62	drvc = di->context;
	63	drvc->instances = NULL;
	64
	65	conn_devices = NULL;
	66	for (l = options; l; l = l->next) {
	67	src = l->data;
	68	if (src->key != SR_CONF_CONN)
	69	continue;
	70	str = g_variant_get_string(src->data, NULL);
	71	conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, str);
	72	}
	73
	74	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	75	for (i = 0; devlist[i]; i++) {
	76	if (conn_devices) {
	77	usb = NULL;
	78	for (l = conn_devices; l; l = l->next) {
	79	usb = l->data;
	80	if (usb->bus == libusb_get_bus_number(devlist[i])
	81	&& usb->address == libusb_get_device_address(devlist[i]))
	82	break;
	83	}
	84	if (!l)
	85	/* This device matched none of the ones that
	86	* matched the conn specification. */
	87	continue;
	88	}
	89
	90	libusb_get_device_descriptor(devlist[i], &des);
	91
	92	if ((ret = libusb_open(devlist[i], &hdl)) < 0)
	93	continue;
	94
	95	manufacturer[0] = product[0] = '\0';
	96	if (des.iManufacturer && (ret = libusb_get_string_descriptor_ascii(
	97	hdl, des.iManufacturer, (unsigned char *) manufacturer,
	98	sizeof(manufacturer))) < 0) {
	99	sr_warn("Failed to get manufacturer string descriptor: %s.",
	100	libusb_error_name(ret));
	101	}
	102	if (des.iProduct && (ret = libusb_get_string_descriptor_ascii(
	103	hdl, des.iProduct, (unsigned char *) product,
	104	sizeof(product))) < 0) {
	105	sr_warn("Failed to get product string descriptor: %s.",
	106	libusb_error_name(ret));
	107	}
	108	libusb_close(hdl);
	109
	110	if (strncmp(manufacturer, "testo", 5))
	111	continue;
	112
	113	usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
	114
	115	/* Hardcode the 435 for now.*/
	116	if (strcmp(product, "testo 435/635/735"))
	117	continue;
	118
	119	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	120	sdi->status = SR_ST_INACTIVE;
	121	sdi->vendor = g_strdup("Testo");
	122	sdi->model = g_strdup("435/635/735");
	123	sdi->driver = di;
	124	sdi->inst_type = SR_INST_USB;
	125	sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
	126	libusb_get_device_address(devlist[i]), NULL);
	127	sdi->connection_id = g_strdup(connection_id);
	128	devc = g_malloc(sizeof(struct dev_context));
	129	devc->model = &models[0];
	130	sr_sw_limits_init(&devc->sw_limits);
	131	sdi->priv = devc;
	132	if (testo_probe_channels(sdi) != SR_OK)
	133	continue;
	134	drvc->instances = g_slist_append(drvc->instances, sdi);
	135	devices = g_slist_append(devices, sdi);
	136	}
	137	libusb_free_device_list(devlist, 1);
	138	g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
	139
	140	return devices;
	141	}
	142
	143	static int dev_open(struct sr_dev_inst *sdi)
	144	{
	145	struct sr_dev_driver *di = sdi->driver;
	146	struct drv_context *drvc = di->context;
	147	struct sr_usb_dev_inst *usb;
	148	int ret;
	149
	150	usb = sdi->conn;
	151
	152	ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
	153	if (ret != SR_OK)
	154	return ret;
	155
	156	if (libusb_has_capability(LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER)) {
	157	if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
	158	if ((ret = libusb_detach_kernel_driver(usb->devhdl, 0)) < 0) {
	159	sr_err("Failed to detach kernel driver: %s.",
	160	libusb_error_name(ret));
	161	return SR_ERR;
	162	}
	163	}
	164	}
	165
	166	if ((ret = libusb_claim_interface(usb->devhdl, 0))) {
	167	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	168	return SR_ERR;
	169	}
	170	sdi->status = SR_ST_ACTIVE;
	171
	172	return SR_OK;
	173	}
	174
	175	static int dev_close(struct sr_dev_inst *sdi)
	176	{
	177	struct sr_usb_dev_inst *usb;
	178
	179	usb = sdi->conn;
	180	if (!usb->devhdl)
	181	/* Nothing to do. */
	182	return SR_OK;
	183
	184	libusb_release_interface(usb->devhdl, 0);
	185	libusb_close(usb->devhdl);
	186	usb->devhdl = NULL;
	187	sdi->status = SR_ST_INACTIVE;
	188
	189	return SR_OK;
	190	}
	191
	192	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	193	const struct sr_channel_group *cg)
	194	{
	195	struct dev_context *devc = sdi->priv;
	196	struct sr_usb_dev_inst *usb;
	197	char str[128];
	198
	199	(void)cg;
	200
	201	switch (key) {
	202	case SR_CONF_CONN:
	203	if (!sdi \|\| !sdi->conn)
	204	return SR_ERR_ARG;
	205	usb = sdi->conn;
	206	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	207	*data = g_variant_new_string(str);
	208	break;
	209	case SR_CONF_LIMIT_MSEC:
	210	case SR_CONF_LIMIT_SAMPLES:
	211	return sr_sw_limits_config_get(&devc->sw_limits, key, data);
	212	default:
	213	return SR_ERR_NA;
	214	}
	215
	216	return SR_OK;
	217	}
	218
	219	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
	220	const struct sr_channel_group *cg)
	221	{
	222	struct dev_context *devc = sdi->priv;
	223
	224	(void)cg;
	225
	226	if (sdi->status != SR_ST_ACTIVE)
	227	return SR_ERR_DEV_CLOSED;
	228
	229	return sr_sw_limits_config_set(&devc->sw_limits, key, data);
	230	}
	231
	232	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	233	const struct sr_channel_group *cg)
	234	{
	235	(void)sdi;
	236	(void)cg;
	237
	238	switch (key) {
	239	case SR_CONF_SCAN_OPTIONS:
	240	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	241	scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
	242	break;
	243	case SR_CONF_DEVICE_OPTIONS:
	244	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	245	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
	246	break;
	247	default:
	248	return SR_ERR_NA;
	249	}
	250
	251	return SR_OK;
	252	}
	253
	254	static void receive_data(struct sr_dev_inst sdi, unsigned char data, int len)
	255	{
	256	struct dev_context *devc;
	257	int packet_size;
	258	uint16_t crc;
	259
	260	devc = sdi->priv;
	261
	262	if (devc->reply_size + len > MAX_REPLY_SIZE) {
	263	/* Something went very wrong. */
	264	sr_dbg("Receive buffer overrun.");
	265	devc->reply_size = 0;
	266	return;
	267	}
	268
	269	memcpy(devc->reply + devc->reply_size, data, len);
	270	devc->reply_size += len;
	271	/* Sixth byte contains the length of the packet. */
	272	if (devc->reply_size < 7)
	273	return;
	274
	275	packet_size = 7 + devc->reply[6] * 7 + 2;
	276	if (devc->reply_size < packet_size)
	277	return;
	278
	279	if (!testo_check_packet_prefix(devc->reply, devc->reply_size))
	280	return;
	281
	282	crc = crc16_mcrf4xx(0xffff, devc->reply, devc->reply_size - 2);
	283	if (crc == RL16(&devc->reply[devc->reply_size - 2])) {
	284	testo_receive_packet(sdi);
	285	sr_sw_limits_update_samples_read(&devc->sw_limits, 1);
	286	} else {
	287	sr_dbg("Packet has invalid CRC.");
	288	}
	289
	290	devc->reply_size = 0;
	291	if (sr_sw_limits_check(&devc->sw_limits))
	292	dev_acquisition_stop(sdi);
	293	else
	294	testo_request_packet(sdi);
	295
	296	}
	297
	298	SR_PRIV void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
	299	{
	300	struct dev_context *devc;
	301	struct sr_dev_inst *sdi;
	302	int ret;
	303
	304	sdi = transfer->user_data;
	305	devc = sdi->priv;
	306	if (transfer == devc->out_transfer)
	307	/* Just the command acknowledgement. */
	308	return;
	309
	310	if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
	311	/* USB device was unplugged. */
	312	dev_acquisition_stop(sdi);
	313	} else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
	314	/* First two bytes in any transfer are FTDI status bytes. */
	315	if (transfer->actual_length > 2)
	316	receive_data(sdi, transfer->buffer + 2, transfer->actual_length - 2);
	317	}
	318	/* Anything else is either an error or a timeout, which is fine:
	319	* we were just going to send another transfer request anyway. */
	320
	321	if (sdi->status == SR_ST_ACTIVE) {
	322	if ((ret = libusb_submit_transfer(transfer) != 0)) {
	323	sr_err("Unable to resubmit transfer: %s.",
	324	libusb_error_name(ret));
	325	g_free(transfer->buffer);
	326	libusb_free_transfer(transfer);
	327	dev_acquisition_stop(sdi);
	328	}
	329	} else {
	330	/* This was the last transfer we're going to receive, so
	331	* clean up now. */
	332	g_free(transfer->buffer);
	333	libusb_free_transfer(transfer);
	334	}
	335	}
	336
	337	static int handle_events(int fd, int revents, void *cb_data)
	338	{
	339	struct sr_dev_driver *di;
	340	struct dev_context *devc;
	341	struct drv_context *drvc;
	342	struct sr_dev_inst *sdi;
	343	struct timeval tv;
	344
	345	(void)fd;
	346	(void)revents;
	347
	348	sdi = cb_data;
	349	devc = sdi->priv;
	350	di = sdi->driver;
	351	drvc = di->context;
	352
	353	if (sr_sw_limits_check(&devc->sw_limits))
	354	dev_acquisition_stop(sdi);
	355
	356	if (sdi->status == SR_ST_STOPPING) {
	357	usb_source_remove(sdi->session, drvc->sr_ctx);
	358	dev_close(sdi);
	359	std_session_send_df_end(sdi, LOG_PREFIX);
	360	}
	361
	362	memset(&tv, 0, sizeof(struct timeval));
	363	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
	364	NULL);
	365
	366	return TRUE;
	367	}
	368
	369	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	370	{
	371	struct sr_dev_driver *di = sdi->driver;
	372	struct drv_context *drvc;
	373	struct dev_context *devc;
	374	struct sr_usb_dev_inst *usb;
	375	struct libusb_transfer *transfer;
	376	int ret;
	377	unsigned char *buf;
	378
	379	drvc = di->context;
	380	if (sdi->status != SR_ST_ACTIVE)
	381	return SR_ERR_DEV_CLOSED;
	382
	383
	384	devc = sdi->priv;
	385	usb = sdi->conn;
	386	devc->reply_size = 0;
	387
	388	std_session_send_df_header(sdi, LOG_PREFIX);
	389
	390	usb_source_add(sdi->session, drvc->sr_ctx, 100,
	391	handle_events, (void *)sdi);
	392
	393	if (testo_set_serial_params(usb) != SR_OK)
	394	return SR_ERR;
	395
	396	devc->out_transfer = libusb_alloc_transfer(0);
	397	if (testo_request_packet(sdi) != SR_OK)
	398	return SR_ERR;
	399
	400	buf = g_malloc(MAX_REPLY_SIZE);
	401	transfer = libusb_alloc_transfer(0);
	402	libusb_fill_bulk_transfer(transfer, usb->devhdl, EP_IN, buf,
	403	MAX_REPLY_SIZE, receive_transfer, (void *)sdi, 100);
	404	if ((ret = libusb_submit_transfer(transfer) != 0)) {
	405	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	406	libusb_free_transfer(transfer);
	407	g_free(buf);
	408	return SR_ERR;
	409	}
	410	devc->reply_size = 0;
	411
	412	sr_sw_limits_acquisition_start(&devc->sw_limits);
	413
	414	return SR_OK;
	415	}
	416
	417	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	418	{
	419	if (sdi->status != SR_ST_ACTIVE)
	420	return SR_ERR_DEV_CLOSED;
	421
	422	sdi->status = SR_ST_STOPPING;
	423
	424	return SR_OK;
	425	}
	426
	427	SR_PRIV struct sr_dev_driver testo_driver_info = {
	428	.name = "testo",
	429	.longname = "Testo",
	430	.api_version = 1,
	431	.init = std_init,
	432	.cleanup = std_cleanup,
	433	.scan = scan,
	434	.dev_list = std_dev_list,
	435	.config_get = config_get,
	436	.config_set = config_set,
	437	.config_list = config_list,
	438	.dev_open = dev_open,
	439	.dev_close = dev_close,
	440	.dev_acquisition_start = dev_acquisition_start,
	441	.dev_acquisition_stop = dev_acquisition_stop,
	442	.context = NULL,
	443	};