[libsigrok.git] / src / hardware / ftdi-la / api.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2015 Sergey Alirzaev <zl29ah@gmail.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 <ftdi.h>
#include <libusb.h>
#include <libsigrok/libsigrok.h>
#include "libsigrok-internal.h"
#include "protocol.h"

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

static const uint32_t devopts[] = {
	SR_CONF_LOGIC_ANALYZER,
	SR_CONF_CONTINUOUS,
	SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
	SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
	SR_CONF_CONN | SR_CONF_GET,
};

static const uint64_t samplerates[] = {
	SR_HZ(3600),
	SR_MHZ(10),
	SR_HZ(1),
};

static const struct ftdi_chip_desc ft2232h_desc = {
	.vendor = 0x0403,
	.product = 0x6010,
	.samplerate_div = 20,
	.channel_names = {
		"ADBUS0",
		"ADBUS1",
		"ADBUS2",
		"ADBUS3",
		"ADBUS4",
		"ADBUS5",
		"ADBUS6",
		"ADBUS7",
		/* TODO: BDBUS[0..7] channels. */
		NULL
	}
};

static const struct ftdi_chip_desc ft232r_desc = {
	.vendor = 0x0403,
	.product = 0x6001,
	.samplerate_div = 30,
	.channel_names = {
		"TXD",
		"RXD",
		"RTS#",
		"CTS#",
		"DTR#",
		"DSR#",
		"DCD#",
		"RI#",
		NULL
	}
};

static const struct ftdi_chip_desc *chip_descs[] = {
	&ft2232h_desc,
	&ft232r_desc,
};

static void scan_device(struct sr_dev_driver *di, struct ftdi_context *ftdic,
	struct libusb_device *dev, GSList **devices)
{
	struct libusb_device_descriptor usb_desc;
	const struct ftdi_chip_desc *desc;
	struct dev_context *devc;
	char *vendor, *model, *serial_num;
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	int rv;

	drvc = di->context;
	libusb_get_device_descriptor(dev, &usb_desc);

	desc = NULL;
	for (unsigned long i = 0; i < ARRAY_SIZE(chip_descs); i++) {
		desc = chip_descs[i];
		if (desc->vendor == usb_desc.idVendor &&
			desc->product == usb_desc.idProduct)
			break;
	}

	if (!desc) {
		sr_spew("Unsupported FTDI device 0x%4x:0x%4x.",
			usb_desc.idVendor, usb_desc.idProduct);
		return;
	}

	/* Allocate memory for our private device context. */
	devc = g_malloc0(sizeof(struct dev_context));

	/* Allocate memory for the incoming data. */
	devc->data_buf = g_malloc0(DATA_BUF_SIZE);

	snprintf(devc->address, sizeof(devc->address), "d:%u/%u",
		libusb_get_bus_number(dev), libusb_get_device_address(dev));

	devc->desc = desc;

	vendor = g_malloc(32);
	model = g_malloc(32);
	serial_num = g_malloc(32);
	rv = ftdi_usb_get_strings(ftdic, dev, vendor, 32,
			     model, 32, serial_num, 32);
	switch (rv) {
	case 0:
		break;
	case -9:
		sr_dbg("The device lacks a serial number.");
		g_free(serial_num);
		serial_num = NULL;
		break;
	default:
		sr_err("Failed to get the FTDI strings: %d", rv);
		goto err_free_strings;
	}
	sr_dbg("Found an FTDI device: %s.", model);

	/* Register the device with libsigrok. */
	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	sdi->status = SR_ST_INACTIVE;
	sdi->vendor = vendor;
	sdi->model = model;
	sdi->serial_num = serial_num;
	sdi->driver = di;
	sdi->priv = devc;

	for (char *const *chan = &(desc->channel_names[0]); *chan; chan++)
		sr_channel_new(sdi, chan - &(desc->channel_names[0]),
				SR_CHANNEL_LOGIC, TRUE, *chan);

	*devices = g_slist_append(*devices, sdi);
	drvc->instances = g_slist_append(drvc->instances, sdi);
	return;

err_free_strings:
	g_free(vendor);
	g_free(model);
	g_free(serial_num);
	g_free(devc->data_buf);
	g_free(devc);
}

static GSList *scan_all(struct ftdi_context *ftdic, struct sr_dev_driver *di,
	GSList *options)
{
	GSList *devices;
	struct ftdi_device_list *devlist = 0;
	struct ftdi_device_list *curdev;
	int ret;

	(void)options;

	devices = NULL;

	ret = ftdi_usb_find_all(ftdic, &devlist, 0, 0);
	if (ret < 0) {
		sr_err("Failed to list devices (%d): %s", ret,
		       ftdi_get_error_string(ftdic));
		return NULL;
	}

	sr_dbg("Number of FTDI devices found: %d", ret);

	curdev = devlist;
	while (curdev) {
		scan_device(di, ftdic, curdev->dev, &devices);
		curdev = curdev->next;
	}

	ftdi_list_free(&devlist);

	return devices;
}

static GSList *scan(struct sr_dev_driver *di, GSList *options)
{
	struct ftdi_context *ftdic;
	struct sr_config *src;
	struct sr_usb_dev_inst *usb;
	const char *conn;
	GSList *l, *conn_devices;
	GSList *devices;
	struct drv_context *drvc;
	libusb_device **devlist;
	int i;

	drvc = di->context;
	drvc->instances = NULL;
	conn = NULL;
	for (l = options; l; l = l->next) {
		src = l->data;
		if (src->key == SR_CONF_CONN) {
			conn = g_variant_get_string(src->data, NULL);
			break;
		}
	}

	/* Allocate memory for the FTDI context (ftdic) and initialize it. */
	ftdic = ftdi_new();
	if (!ftdic) {
		sr_err("Failed to initialize libftdi.");
		return NULL;
	}

	if (conn) {
		devices = NULL;
		libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
		for (i = 0; devlist[i]; i++) {
			conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
			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])) {
					scan_device(di, ftdic, devlist[i], &devices);
				}
			}
		}
		libusb_free_device_list(devlist, 1);
	} else
		devices = scan_all(ftdic, di, options);

	ftdi_free(ftdic);

	return devices;
}

static void clear_helper(void *priv)
{
	struct dev_context *devc;

	devc = priv;
	g_free(devc->data_buf);
	g_free(devc);
}

static int dev_clear(const struct sr_dev_driver *di)
{
	return std_dev_clear(di, clear_helper);
}

static int dev_open(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int ret = SR_OK;

	devc = sdi->priv;

	devc->ftdic = ftdi_new();
	if (!devc->ftdic)
		return SR_ERR;

	ret = ftdi_usb_open_string(devc->ftdic, devc->address);
	if (ret < 0) {
		/* Log errors, except for -3 ("device not found"). */
		if (ret != -3)
			sr_err("Failed to open device (%d): %s", ret,
			       ftdi_get_error_string(devc->ftdic));
		goto err_ftdi_free;
	}

	/* Purge RX/TX buffers in the FTDI chip. */
	ret = ftdi_usb_purge_buffers(devc->ftdic);
	if (ret < 0) {
		sr_err("Failed to purge FTDI RX/TX buffers (%d): %s.",
		       ret, ftdi_get_error_string(devc->ftdic));
		goto err_dev_open_close_ftdic;
	}
	sr_dbg("FTDI chip buffers purged successfully.");

	/* Reset the FTDI bitmode. */
	ret = ftdi_set_bitmode(devc->ftdic, 0x00, BITMODE_RESET);
	if (ret < 0) {
		sr_err("Failed to reset the FTDI chip bitmode (%d): %s.",
		       ret, ftdi_get_error_string(devc->ftdic));
		goto err_dev_open_close_ftdic;
	}
	sr_dbg("FTDI chip bitmode reset successfully.");

	ret = ftdi_set_bitmode(devc->ftdic, 0x00, BITMODE_BITBANG);
	if (ret < 0) {
		sr_err("Failed to put FTDI chip into bitbang mode (%d): %s.",
		       ret, ftdi_get_error_string(devc->ftdic));
		goto err_dev_open_close_ftdic;
	}
	sr_dbg("FTDI chip bitbang mode entered successfully.");

	sdi->status = SR_ST_ACTIVE;

	return SR_OK;
err_dev_open_close_ftdic:
	ftdi_usb_close(devc->ftdic);
err_ftdi_free:
	ftdi_free(devc->ftdic);
	return SR_ERR;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

	devc = sdi->priv;

	if (devc->ftdic) {
		ftdi_usb_close(devc->ftdic);
		ftdi_free(devc->ftdic);
		devc->ftdic = 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)
{
	int ret;
	struct dev_context *devc;
	struct sr_usb_dev_inst *usb;
	char str[128];

	(void)cg;

	devc = sdi->priv;

	ret = SR_OK;
	switch (key) {
	case SR_CONF_SAMPLERATE:
		*data = g_variant_new_uint64(devc->cur_samplerate);
		break;
	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;
	default:
		return SR_ERR_NA;
	}

	return ret;
}

static int config_set(uint32_t key, GVariant *data,
	const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
{
	int ret;
	struct dev_context *devc;
	uint64_t value;

	(void)cg;

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

	devc = sdi->priv;

	ret = SR_OK;
	switch (key) {
	case SR_CONF_LIMIT_MSEC:
		value = g_variant_get_uint64(data);
		/* TODO: Implement. */
		ret = SR_ERR_NA;
		break;
	case SR_CONF_LIMIT_SAMPLES:
		if (g_variant_get_uint64(data) == 0)
			return SR_ERR_ARG;
		devc->limit_samples = g_variant_get_uint64(data);
		break;
	case SR_CONF_SAMPLERATE:
		value = g_variant_get_uint64(data);
		if (value < 3600)
			return SR_ERR_SAMPLERATE;
		devc->cur_samplerate = value;
		return ftdi_la_set_samplerate(devc);
	default:
		ret = SR_ERR_NA;
	}

	return ret;
}

static int config_list(uint32_t key, GVariant **data,
	const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
{
	int ret;
	GVariant *gvar;
	GVariantBuilder gvb;

	(void)sdi;
	(void)cg;

	ret = SR_OK;
	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;
	case SR_CONF_SAMPLERATE:
		g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
		gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
			samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
		g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
		*data = g_variant_builder_end(&gvb);
		break;
	default:
		return SR_ERR_NA;
	}

	return ret;
}

static int dev_acquisition_start(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

	devc = sdi->priv;

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

	if (!devc->ftdic)
		return SR_ERR_BUG;

	ftdi_set_bitmode(devc->ftdic, 0, BITMODE_BITBANG);

	/* Properly reset internal variables before every new acquisition. */
	devc->samples_sent = 0;
	devc->bytes_received = 0;

	std_session_send_df_header(sdi, LOG_PREFIX);

	/* Hook up a dummy handler to receive data from the device. */
	sr_session_source_add(sdi->session, -1, G_IO_IN, 0,
			      ftdi_la_receive_data, (void *)sdi);

	return SR_OK;
}

static int dev_acquisition_stop(struct sr_dev_inst *sdi)
{
	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

	sr_dbg("Stopping acquisition.");
	sr_session_source_remove(sdi->session, -1);

	std_session_send_df_end(sdi, LOG_PREFIX);

	return SR_OK;
}

static struct sr_dev_driver ftdi_la_driver_info = {
	.name = "ftdi-la",
	.longname = "FTDI LA",
	.api_version = 1,
	.init = std_init,
	.cleanup = std_cleanup,
	.scan = scan,
	.dev_list = std_dev_list,
	.dev_clear = 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(ftdi_la_driver_info);
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2015 Sergey Alirzaev <zl29ah@gmail.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 <ftdi.h>
	22	#include <libusb.h>
	23	#include <libsigrok/libsigrok.h>
	24	#include "libsigrok-internal.h"
	25	#include "protocol.h"
	26
	27	static const uint32_t scanopts[] = {
	28	SR_CONF_CONN,
	29	};
	30
	31	static const uint32_t devopts[] = {
	32	SR_CONF_LOGIC_ANALYZER,
	33	SR_CONF_CONTINUOUS,
	34	SR_CONF_LIMIT_SAMPLES \| SR_CONF_SET,
	35	SR_CONF_SAMPLERATE \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
	36	SR_CONF_CONN \| SR_CONF_GET,
	37	};
	38
	39	static const uint64_t samplerates[] = {
	40	SR_HZ(3600),
	41	SR_MHZ(10),
	42	SR_HZ(1),
	43	};
	44
	45	static const struct ftdi_chip_desc ft2232h_desc = {
	46	.vendor = 0x0403,
	47	.product = 0x6010,
	48	.samplerate_div = 20,
	49	.channel_names = {
	50	"ADBUS0",
	51	"ADBUS1",
	52	"ADBUS2",
	53	"ADBUS3",
	54	"ADBUS4",
	55	"ADBUS5",
	56	"ADBUS6",
	57	"ADBUS7",
	58	/* TODO: BDBUS[0..7] channels. */
	59	NULL
	60	}
	61	};
	62
	63	static const struct ftdi_chip_desc ft232r_desc = {
	64	.vendor = 0x0403,
	65	.product = 0x6001,
	66	.samplerate_div = 30,
	67	.channel_names = {
	68	"TXD",
	69	"RXD",
	70	"RTS#",
	71	"CTS#",
	72	"DTR#",
	73	"DSR#",
	74	"DCD#",
	75	"RI#",
	76	NULL
	77	}
	78	};
	79
	80	static const struct ftdi_chip_desc *chip_descs[] = {
	81	&ft2232h_desc,
	82	&ft232r_desc,
	83	};
	84
	85	static void scan_device(struct sr_dev_driver di, struct ftdi_context ftdic,
	86	struct libusb_device dev, GSList *devices)
	87	{
	88	struct libusb_device_descriptor usb_desc;
	89	const struct ftdi_chip_desc *desc;
	90	struct dev_context *devc;
	91	char vendor, model, *serial_num;
	92	struct sr_dev_inst *sdi;
	93	struct drv_context *drvc;
	94	int rv;
	95
	96	drvc = di->context;
	97	libusb_get_device_descriptor(dev, &usb_desc);
	98
	99	desc = NULL;
	100	for (unsigned long i = 0; i < ARRAY_SIZE(chip_descs); i++) {
	101	desc = chip_descs[i];
	102	if (desc->vendor == usb_desc.idVendor &&
	103	desc->product == usb_desc.idProduct)
	104	break;
	105	}
	106
	107	if (!desc) {
	108	sr_spew("Unsupported FTDI device 0x%4x:0x%4x.",
	109	usb_desc.idVendor, usb_desc.idProduct);
	110	return;
	111	}
	112
	113	/* Allocate memory for our private device context. */
	114	devc = g_malloc0(sizeof(struct dev_context));
	115
	116	/* Allocate memory for the incoming data. */
	117	devc->data_buf = g_malloc0(DATA_BUF_SIZE);
	118
	119	snprintf(devc->address, sizeof(devc->address), "d:%u/%u",
	120	libusb_get_bus_number(dev), libusb_get_device_address(dev));
	121
	122	devc->desc = desc;
	123
	124	vendor = g_malloc(32);
	125	model = g_malloc(32);
	126	serial_num = g_malloc(32);
	127	rv = ftdi_usb_get_strings(ftdic, dev, vendor, 32,
	128	model, 32, serial_num, 32);
	129	switch (rv) {
	130	case 0:
	131	break;
	132	case -9:
	133	sr_dbg("The device lacks a serial number.");
	134	g_free(serial_num);
	135	serial_num = NULL;
	136	break;
	137	default:
	138	sr_err("Failed to get the FTDI strings: %d", rv);
	139	goto err_free_strings;
	140	}
	141	sr_dbg("Found an FTDI device: %s.", model);
	142
	143	/* Register the device with libsigrok. */
	144	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	145	sdi->status = SR_ST_INACTIVE;
	146	sdi->vendor = vendor;
	147	sdi->model = model;
	148	sdi->serial_num = serial_num;
	149	sdi->driver = di;
	150	sdi->priv = devc;
	151
	152	for (char const chan = &(desc->channel_names[0]); *chan; chan++)
	153	sr_channel_new(sdi, chan - &(desc->channel_names[0]),
	154	SR_CHANNEL_LOGIC, TRUE, *chan);
	155
	156	devices = g_slist_append(devices, sdi);
	157	drvc->instances = g_slist_append(drvc->instances, sdi);
	158	return;
	159
	160	err_free_strings:
	161	g_free(vendor);
	162	g_free(model);
	163	g_free(serial_num);
	164	g_free(devc->data_buf);
	165	g_free(devc);
	166	}
	167
	168	static GSList scan_all(struct ftdi_context ftdic, struct sr_dev_driver *di,
	169	GSList *options)
	170	{
	171	GSList *devices;
	172	struct ftdi_device_list *devlist = 0;
	173	struct ftdi_device_list *curdev;
	174	int ret;
	175
	176	(void)options;
	177
	178	devices = NULL;
	179
	180	ret = ftdi_usb_find_all(ftdic, &devlist, 0, 0);
	181	if (ret < 0) {
	182	sr_err("Failed to list devices (%d): %s", ret,
	183	ftdi_get_error_string(ftdic));
	184	return NULL;
	185	}
	186
	187	sr_dbg("Number of FTDI devices found: %d", ret);
	188
	189	curdev = devlist;
	190	while (curdev) {
	191	scan_device(di, ftdic, curdev->dev, &devices);
	192	curdev = curdev->next;
	193	}
	194
	195	ftdi_list_free(&devlist);
	196
	197	return devices;
	198	}
	199
	200	static GSList scan(struct sr_dev_driver di, GSList *options)
	201	{
	202	struct ftdi_context *ftdic;
	203	struct sr_config *src;
	204	struct sr_usb_dev_inst *usb;
	205	const char *conn;
	206	GSList l, conn_devices;
	207	GSList *devices;
	208	struct drv_context *drvc;
	209	libusb_device **devlist;
	210	int i;
	211
	212	drvc = di->context;
	213	drvc->instances = NULL;
	214	conn = NULL;
	215	for (l = options; l; l = l->next) {
	216	src = l->data;
	217	if (src->key == SR_CONF_CONN) {
	218	conn = g_variant_get_string(src->data, NULL);
	219	break;
	220	}
	221	}
	222
	223	/* Allocate memory for the FTDI context (ftdic) and initialize it. */
	224	ftdic = ftdi_new();
	225	if (!ftdic) {
	226	sr_err("Failed to initialize libftdi.");
	227	return NULL;
	228	}
	229
	230	if (conn) {
	231	devices = NULL;
	232	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	233	for (i = 0; devlist[i]; i++) {
	234	conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
	235	for (l = conn_devices; l; l = l->next) {
	236	usb = l->data;
	237	if (usb->bus == libusb_get_bus_number(devlist[i])
	238	&& usb->address == libusb_get_device_address(devlist[i])) {
	239	scan_device(di, ftdic, devlist[i], &devices);
	240	}
	241	}
	242	}
	243	libusb_free_device_list(devlist, 1);
	244	} else
	245	devices = scan_all(ftdic, di, options);
	246
	247	ftdi_free(ftdic);
	248
	249	return devices;
	250	}
	251
	252	static void clear_helper(void *priv)
	253	{
	254	struct dev_context *devc;
	255
	256	devc = priv;
	257	g_free(devc->data_buf);
	258	g_free(devc);
	259	}
	260
	261	static int dev_clear(const struct sr_dev_driver *di)
	262	{
	263	return std_dev_clear(di, clear_helper);
	264	}
	265
	266	static int dev_open(struct sr_dev_inst *sdi)
	267	{
	268	struct dev_context *devc;
	269	int ret = SR_OK;
	270
	271	devc = sdi->priv;
	272
	273	devc->ftdic = ftdi_new();
	274	if (!devc->ftdic)
	275	return SR_ERR;
	276
	277	ret = ftdi_usb_open_string(devc->ftdic, devc->address);
	278	if (ret < 0) {
	279	/* Log errors, except for -3 ("device not found"). */
	280	if (ret != -3)
	281	sr_err("Failed to open device (%d): %s", ret,
	282	ftdi_get_error_string(devc->ftdic));
	283	goto err_ftdi_free;
	284	}
	285
	286	/* Purge RX/TX buffers in the FTDI chip. */
	287	ret = ftdi_usb_purge_buffers(devc->ftdic);
	288	if (ret < 0) {
	289	sr_err("Failed to purge FTDI RX/TX buffers (%d): %s.",
	290	ret, ftdi_get_error_string(devc->ftdic));
	291	goto err_dev_open_close_ftdic;
	292	}
	293	sr_dbg("FTDI chip buffers purged successfully.");
	294
	295	/* Reset the FTDI bitmode. */
	296	ret = ftdi_set_bitmode(devc->ftdic, 0x00, BITMODE_RESET);
	297	if (ret < 0) {
	298	sr_err("Failed to reset the FTDI chip bitmode (%d): %s.",
	299	ret, ftdi_get_error_string(devc->ftdic));
	300	goto err_dev_open_close_ftdic;
	301	}
	302	sr_dbg("FTDI chip bitmode reset successfully.");
	303
	304	ret = ftdi_set_bitmode(devc->ftdic, 0x00, BITMODE_BITBANG);
	305	if (ret < 0) {
	306	sr_err("Failed to put FTDI chip into bitbang mode (%d): %s.",
	307	ret, ftdi_get_error_string(devc->ftdic));
	308	goto err_dev_open_close_ftdic;
	309	}
	310	sr_dbg("FTDI chip bitbang mode entered successfully.");
	311
	312	sdi->status = SR_ST_ACTIVE;
	313
	314	return SR_OK;
	315	err_dev_open_close_ftdic:
	316	ftdi_usb_close(devc->ftdic);
	317	err_ftdi_free:
	318	ftdi_free(devc->ftdic);
	319	return SR_ERR;
	320	}
	321
	322	static int dev_close(struct sr_dev_inst *sdi)
	323	{
	324	struct dev_context *devc;
	325
	326	devc = sdi->priv;
	327
	328	if (devc->ftdic) {
	329	ftdi_usb_close(devc->ftdic);
	330	ftdi_free(devc->ftdic);
	331	devc->ftdic = NULL;
	332	}
	333
	334	sdi->status = SR_ST_INACTIVE;
	335
	336	return SR_OK;
	337	}
	338
	339	static int config_get(uint32_t key, GVariant **data,
	340	const struct sr_dev_inst sdi, const struct sr_channel_group cg)
	341	{
	342	int ret;
	343	struct dev_context *devc;
	344	struct sr_usb_dev_inst *usb;
	345	char str[128];
	346
	347	(void)cg;
	348
	349	devc = sdi->priv;
	350
	351	ret = SR_OK;
	352	switch (key) {
	353	case SR_CONF_SAMPLERATE:
	354	*data = g_variant_new_uint64(devc->cur_samplerate);
	355	break;
	356	case SR_CONF_CONN:
	357	if (!sdi \|\| !sdi->conn)
	358	return SR_ERR_ARG;
	359	usb = sdi->conn;
	360	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	361	*data = g_variant_new_string(str);
	362	break;
	363	default:
	364	return SR_ERR_NA;
	365	}
	366
	367	return ret;
	368	}
	369
	370	static int config_set(uint32_t key, GVariant *data,
	371	const struct sr_dev_inst sdi, const struct sr_channel_group cg)
	372	{
	373	int ret;
	374	struct dev_context *devc;
	375	uint64_t value;
	376
	377	(void)cg;
	378
	379	if (sdi->status != SR_ST_ACTIVE)
	380	return SR_ERR_DEV_CLOSED;
	381
	382	devc = sdi->priv;
	383
	384	ret = SR_OK;
	385	switch (key) {
	386	case SR_CONF_LIMIT_MSEC:
	387	value = g_variant_get_uint64(data);
	388	/* TODO: Implement. */
	389	ret = SR_ERR_NA;
	390	break;
	391	case SR_CONF_LIMIT_SAMPLES:
	392	if (g_variant_get_uint64(data) == 0)
	393	return SR_ERR_ARG;
	394	devc->limit_samples = g_variant_get_uint64(data);
	395	break;
	396	case SR_CONF_SAMPLERATE:
	397	value = g_variant_get_uint64(data);
	398	if (value < 3600)
	399	return SR_ERR_SAMPLERATE;
	400	devc->cur_samplerate = value;
	401	return ftdi_la_set_samplerate(devc);
	402	default:
	403	ret = SR_ERR_NA;
	404	}
	405
	406	return ret;
	407	}
	408
	409	static int config_list(uint32_t key, GVariant **data,
	410	const struct sr_dev_inst sdi, const struct sr_channel_group cg)
	411	{
	412	int ret;
	413	GVariant *gvar;
	414	GVariantBuilder gvb;
	415
	416	(void)sdi;
	417	(void)cg;
	418
	419	ret = SR_OK;
	420	switch (key) {
	421	case SR_CONF_SCAN_OPTIONS:
	422	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	423	scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
	424	break;
	425	case SR_CONF_DEVICE_OPTIONS:
	426	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	427	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
	428	break;
	429	case SR_CONF_SAMPLERATE:
	430	g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
	431	gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
	432	samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
	433	g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
	434	*data = g_variant_builder_end(&gvb);
	435	break;
	436	default:
	437	return SR_ERR_NA;
	438	}
	439
	440	return ret;
	441	}
	442
	443	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	444	{
	445	struct dev_context *devc;
	446
	447	devc = sdi->priv;
	448
	449	if (sdi->status != SR_ST_ACTIVE)
	450	return SR_ERR_DEV_CLOSED;
	451
	452	if (!devc->ftdic)
	453	return SR_ERR_BUG;
	454
	455	ftdi_set_bitmode(devc->ftdic, 0, BITMODE_BITBANG);
	456
	457	/* Properly reset internal variables before every new acquisition. */
	458	devc->samples_sent = 0;
	459	devc->bytes_received = 0;
	460
	461	std_session_send_df_header(sdi, LOG_PREFIX);
	462
	463	/* Hook up a dummy handler to receive data from the device. */
	464	sr_session_source_add(sdi->session, -1, G_IO_IN, 0,
	465	ftdi_la_receive_data, (void *)sdi);
	466
	467	return SR_OK;
	468	}
	469
	470	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	471	{
	472	if (sdi->status != SR_ST_ACTIVE)
	473	return SR_ERR_DEV_CLOSED;
	474
	475	sr_dbg("Stopping acquisition.");
	476	sr_session_source_remove(sdi->session, -1);
	477
	478	std_session_send_df_end(sdi, LOG_PREFIX);
	479
	480	return SR_OK;
	481	}
	482
	483	static struct sr_dev_driver ftdi_la_driver_info = {
	484	.name = "ftdi-la",
	485	.longname = "FTDI LA",
	486	.api_version = 1,
	487	.init = std_init,
	488	.cleanup = std_cleanup,
	489	.scan = scan,
	490	.dev_list = std_dev_list,
	491	.dev_clear = dev_clear,
	492	.config_get = config_get,
	493	.config_set = config_set,
	494	.config_list = config_list,
	495	.dev_open = dev_open,
	496	.dev_close = dev_close,
	497	.dev_acquisition_start = dev_acquisition_start,
	498	.dev_acquisition_stop = dev_acquisition_stop,
	499	.context = NULL,
	500	};
	501	SR_REGISTER_DEV_DRIVER(ftdi_la_driver_info);