[libsigrok.git] / src / hardware / chromium-twinkie / api.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright 2014 Google, Inc
 *
 * 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 2 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 <libusb.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <libsigrok/libsigrok.h>
#include "libsigrok-internal.h"
#include "protocol.h"

#define TWINKIE_VID		0x18d1
#define TWINKIE_PID		0x500a

#define USB_INTERFACE		1
#define USB_CONFIGURATION	1

#define MAX_RENUM_DELAY_MS	3000
#define NUM_SIMUL_TRANSFERS	32

#define SAMPLE_RATE		SR_KHZ(2400)

static const int32_t hwopts[] = {
	SR_CONF_CONN,
};

static const int32_t hwcaps[] = {
	SR_CONF_LOGIC_ANALYZER,
	SR_CONF_CONTINUOUS,
	SR_CONF_CONN | SR_CONF_GET,
	SR_CONF_SAMPLERATE | SR_CONF_GET,
	SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
};

static const struct chan {
	char *name;
	int type;
} chan_defs[] = {
	{"CC1", SR_CHANNEL_LOGIC},
	{"CC2", SR_CHANNEL_LOGIC},

	{NULL, 0}
};

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

	drvc = di->context;

	conn = NULL;
	for (l = options; l; l = l->next) {
		src = l->data;
		switch (src->key) {
		case SR_CONF_CONN:
			conn = g_variant_get_string(src->data, NULL);
			break;
		}
	}
	if (conn)
		conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
	else
		conn_devices = NULL;

	/* Find all Twinkie devices */
	devices = NULL;
	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	for (i = 0; devlist[i]; i++) {
		if (conn) {
			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;
		}

		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 != TWINKIE_VID || des.idProduct != TWINKIE_PID)
			continue;

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

		sdi = g_malloc0(sizeof(struct sr_dev_inst));
		sdi->status = SR_ST_INITIALIZING;
		sdi->vendor = g_strdup("Chromium");
		sdi->model = g_strdup("Twinkie");
		sdi->driver = di;
		sdi->connection_id = g_strdup(connection_id);

		for (j = 0; chan_defs[j].name; j++)
			if (!(ch = sr_channel_new(sdi, j, chan_defs[j].type,
						  TRUE, chan_defs[j].name)))
				return NULL;

		if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
			return NULL;
		sdi->priv = devc;
		drvc->instances = g_slist_append(drvc->instances, sdi);
		devices = g_slist_append(devices, sdi);

		sr_dbg("Found a Twinkie dongle.");
		sdi->status = SR_ST_INACTIVE;
		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);
	}
	libusb_free_device_list(devlist, 1);
	g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);

	return devices;
}

static int twinkie_dev_open(struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di;
	libusb_device **devlist;
	struct sr_usb_dev_inst *usb;
	struct libusb_device_descriptor des;
	struct drv_context *drvc;
	int ret, i, device_count;
	char connection_id[64];

	di = sdi->driver;
	drvc = di->context;
	usb = sdi->conn;

	if (sdi->status == SR_ST_ACTIVE)
		/* Device is already in use. */
		return SR_ERR;

	device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	if (device_count < 0) {
		sr_err("Failed to get device list: %s.",
		       libusb_error_name(device_count));
		return SR_ERR;
	}

	for (i = 0; i < device_count; i++) {
		if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
			sr_err("Failed to get device descriptor: %s.",
			       libusb_error_name(ret));
			continue;
		}

		if (des.idVendor != TWINKIE_VID || des.idProduct != TWINKIE_PID)
			continue;

		if ((sdi->status == SR_ST_INITIALIZING) ||
				(sdi->status == SR_ST_INACTIVE)) {
			/*
			 * Check device by its physical USB bus/port address.
			 */
			usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
			if (strcmp(sdi->connection_id, connection_id))
				/* This is not the one. */
				continue;
		}

		if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
			if (usb->address == 0xff)
				/*
				 * First time we touch this device after FW
				 * upload, so we don't know the address yet.
				 */
				usb->address = libusb_get_device_address(devlist[i]);
		} else {
			sr_err("Failed to open device: %s.",
			       libusb_error_name(ret));
			break;
		}

		ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
		if (ret == LIBUSB_ERROR_BUSY) {
			sr_err("Unable to claim USB interface. Another "
			       "program or driver has already claimed it.");
			break;
		} else if (ret == LIBUSB_ERROR_NO_DEVICE) {
			sr_err("Device has been disconnected.");
			break;
		} else if (ret != 0) {
			sr_err("Unable to claim interface: %s.",
			       libusb_error_name(ret));
			break;
		}

		if ((ret = twinkie_init_device(sdi)) != SR_OK) {
			sr_err("Failed to init device.");
			break;
		}

		sdi->status = SR_ST_ACTIVE;
		sr_info("Opened device %d.%d, interface %d.",
			usb->bus, usb->address, USB_INTERFACE);

		break;
	}
	libusb_free_device_list(devlist, 1);

	if (sdi->status != SR_ST_ACTIVE) {
		if (usb->devhdl) {
			libusb_release_interface(usb->devhdl, USB_INTERFACE);
			libusb_close(usb->devhdl);
			usb->devhdl = NULL;
		}
		return SR_ERR;
	}

	return SR_OK;
}

static int dev_open(struct sr_dev_inst *sdi)
{
	int ret;

	ret = twinkie_dev_open(sdi);
	if (ret != SR_OK) {
		sr_err("Unable to open device.");
		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 == NULL)
		return SR_ERR;

	sr_info("Closing device %d.%d interface %d.",
		usb->bus, usb->address, USB_INTERFACE);
	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	libusb_close(usb->devhdl);
	usb->devhdl = NULL;
	sdi->status = SR_ST_INACTIVE;

	return SR_OK;
}

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

static int config_get(uint32_t key, GVariant **data,
		const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct sr_usb_dev_inst *usb;
	char str[128];
	int ret;

	(void)cg;

	ret = SR_OK;
	switch (key) {
	case SR_CONF_CONN:
		if (!sdi || !sdi->conn)
			return SR_ERR_ARG;
		usb = sdi->conn;
		if (usb->address == 255)
			/* Device still needs to re-enumerate after firmware
			 * upload, so we don't know its (future) address. */
			return SR_ERR;
		snprintf(str, 128, "%d.%d", usb->bus, usb->address);
		*data = g_variant_new_string(str);
		break;
	case SR_CONF_SAMPLERATE:
		*data = g_variant_new_uint64(SAMPLE_RATE);
		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)
{
	struct dev_context *devc;
	int ret;

	(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_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		break;
	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;

	(void)sdi;
	(void)cg;

	ret = SR_OK;
	switch (key) {
	case SR_CONF_SCAN_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
		break;
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
		break;
	default:
		return SR_ERR_NA;
	}

	return ret;
}

static void abort_acquisition(struct dev_context *devc)
{
	int i;

	devc->sent_samples = -1;

	for (i = devc->num_transfers - 1; i >= 0; i--) {
		if (devc->transfers[i])
			libusb_cancel_transfer(devc->transfers[i]);
	}
}

static int receive_data(int fd, int revents, void *cb_data)
{
	struct timeval tv;
	struct dev_context *devc;
	struct drv_context *drvc;
	const struct sr_dev_inst *sdi;
	struct sr_dev_driver *di;

	(void)fd;
	(void)revents;

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

	tv.tv_sec = tv.tv_usec = 0;
	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);

	if (devc->sent_samples == -2) {
		abort_acquisition(devc);
	}

	return TRUE;
}

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

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

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

	devc->sent_samples = 0;
	/* reset per-CC context */
	memset(devc->cc, 0, sizeof(devc->cc));

	timeout = 1000;
	num_transfers = 10;
	size = 10*1024;
	convsize = size * 8 * 256 /* largest size : only rollbacks/no edges */;
	devc->submitted_transfers = 0;

	devc->convbuffer_size = convsize;
	if (!(devc->convbuffer = g_try_malloc(convsize))) {
		sr_err("Conversion buffer malloc failed.");
		return SR_ERR_MALLOC;
	}
	memset(devc->convbuffer, 0, devc->convbuffer_size);

	devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
	if (!devc->transfers) {
		sr_err("USB transfers malloc failed.");
		g_free(devc->convbuffer);
		return SR_ERR_MALLOC;
	}

	devc->num_transfers = num_transfers;
	for (i = 0; i < num_transfers; i++) {
		if (!(buf = g_try_malloc(size))) {
			sr_err("USB transfer buffer malloc failed.");
			if (devc->submitted_transfers)
				abort_acquisition(devc);
			else {
				g_free(devc->transfers);
				g_free(devc->convbuffer);
			}
			return SR_ERR_MALLOC;
		}
		transfer = libusb_alloc_transfer(0);
		libusb_fill_bulk_transfer(transfer, usb->devhdl,
				3 | LIBUSB_ENDPOINT_IN, buf, size,
				twinkie_receive_transfer, (void *)sdi, timeout);
		if ((ret = libusb_submit_transfer(transfer)) != 0) {
			sr_err("Failed to submit transfer: %s.",
			       libusb_error_name(ret));
			libusb_free_transfer(transfer);
			g_free(buf);
			abort_acquisition(devc);
			return SR_ERR;
		}
		devc->transfers[i] = transfer;
		devc->submitted_transfers++;
	}

	devc->ctx = drvc->sr_ctx;

	usb_source_add(sdi->session, devc->ctx, timeout, receive_data,
		      (void *)sdi);

	/* Send header packet to the session bus. */
	std_session_send_df_header(sdi);

	if ((ret = twinkie_start_acquisition(sdi)) != SR_OK) {
		abort_acquisition(devc);
		return ret;
	}

	return SR_OK;
}

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

	abort_acquisition(sdi->priv);

	return SR_OK;
}

static struct sr_dev_driver chromium_twinkie_driver_info = {
	.name = "chromium-twinkie",
	.longname = "Chromium Twinkie",
	.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,
};
SR_REGISTER_DEV_DRIVER(chromium_twinkie_driver_info);
Commit	Line	Data
744e43bc VP	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright 2014 Google, Inc
	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 2 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 <libusb.h>
	22	#include <stdlib.h>
	23	#include <string.h>
	24	#include <math.h>
	25	#include <libsigrok/libsigrok.h>
	26	#include "libsigrok-internal.h"
	27	#include "protocol.h"
	28
	29	#define TWINKIE_VID 0x18d1
	30	#define TWINKIE_PID 0x500a
	31
	32	#define USB_INTERFACE 1
	33	#define USB_CONFIGURATION 1
	34
	35	#define MAX_RENUM_DELAY_MS 3000
	36	#define NUM_SIMUL_TRANSFERS 32
	37
	38	#define SAMPLE_RATE SR_KHZ(2400)
	39
	40	static const int32_t hwopts[] = {
	41	SR_CONF_CONN,
	42	};
	43
	44	static const int32_t hwcaps[] = {
	45	SR_CONF_LOGIC_ANALYZER,
	46	SR_CONF_CONTINUOUS,
	47	SR_CONF_CONN \| SR_CONF_GET,
	48	SR_CONF_SAMPLERATE \| SR_CONF_GET,
	49	SR_CONF_LIMIT_SAMPLES \| SR_CONF_SET,
	50	};
	51
	52	static const struct chan {
	53	char *name;
	54	int type;
	55	} chan_defs[] = {
	56	{"CC1", SR_CHANNEL_LOGIC},
	57	{"CC2", SR_CHANNEL_LOGIC},
	58
	59	{NULL, 0}
	60	};
	61
	62	static GSList scan(struct sr_dev_driver di, GSList *options)
	63	{
	64	struct drv_context *drvc;
65	struct dev_context *devc;
66	struct sr_dev_inst *sdi;
67	struct sr_usb_dev_inst *usb;
68	struct sr_channel *ch;
69	struct sr_config *src;
70	GSList l, devices, *conn_devices;
71	struct libusb_device_descriptor des;
72	libusb_device **devlist;
73	int ret, i, j;
74	const char *conn;
75	char connection_id[64];
76
77	drvc = di->context;
78
79	conn = NULL;
80	for (l = options; l; l = l->next) {
81	src = l->data;
82	switch (src->key) {
83	case SR_CONF_CONN:
84	conn = g_variant_get_string(src->data, NULL);
85	break;
86	}
87	}
88	if (conn)
89	conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
90	else
91	conn_devices = NULL;
92
93	/* Find all Twinkie devices */
94	devices = NULL;
95	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
96	for (i = 0; devlist[i]; i++) {
97	if (conn) {
98	usb = NULL;
99	for (l = conn_devices; l; l = l->next) {
100	usb = l->data;
101	if (usb->bus == libusb_get_bus_number(devlist[i])
102	&& usb->address == libusb_get_device_address(devlist[i]))
103	break;
104	}
105	if (!l)
106	/* This device matched none of the ones that
107	* matched the conn specification. */
108	continue;
109	}
110
111	if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
112	sr_warn("Failed to get device descriptor: %s.",
113	libusb_error_name(ret));
114	continue;
115	}
116
117	if (des.idVendor != TWINKIE_VID \|\| des.idProduct != TWINKIE_PID)
118	continue;
119
120	usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
121
122	sdi = g_malloc0(sizeof(struct sr_dev_inst));
123	sdi->status = SR_ST_INITIALIZING;
124	sdi->vendor = g_strdup("Chromium");
125	sdi->model = g_strdup("Twinkie");
126	sdi->driver = di;
127	sdi->connection_id = g_strdup(connection_id);
128
129	for (j = 0; chan_defs[j].name; j++)
130	if (!(ch = sr_channel_new(sdi, j, chan_defs[j].type,
131	TRUE, chan_defs[j].name)))
132	return NULL;
133
134	if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
135	return NULL;
136	sdi->priv = devc;
137	drvc->instances = g_slist_append(drvc->instances, sdi);
138	devices = g_slist_append(devices, sdi);
139
140	sr_dbg("Found a Twinkie dongle.");
141	sdi->status = SR_ST_INACTIVE;
142	sdi->inst_type = SR_INST_USB;
143	sdi->conn = sr_usb_dev_inst_new(
144	libusb_get_bus_number(devlist[i]),
145	libusb_get_device_address(devlist[i]), NULL);
146	}
147	libusb_free_device_list(devlist, 1);
148	g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
149
150	return devices;
151	}
152
153	static int twinkie_dev_open(struct sr_dev_inst *sdi)
154	{
155	struct sr_dev_driver *di;
156	libusb_device **devlist;
157	struct sr_usb_dev_inst *usb;
158	struct libusb_device_descriptor des;
159	struct drv_context *drvc;
160	int ret, i, device_count;
161	char connection_id[64];
162
163	di = sdi->driver;
164	drvc = di->context;
165	usb = sdi->conn;
166
167	if (sdi->status == SR_ST_ACTIVE)
168	/* Device is already in use. */
169	return SR_ERR;
170
171	device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
172	if (device_count < 0) {
173	sr_err("Failed to get device list: %s.",
174	libusb_error_name(device_count));
175	return SR_ERR;
176	}
177
178	for (i = 0; i < device_count; i++) {
179	if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
180	sr_err("Failed to get device descriptor: %s.",
181	libusb_error_name(ret));
182	continue;
183	}
184
185	if (des.idVendor != TWINKIE_VID \|\| des.idProduct != TWINKIE_PID)
186	continue;
187
188	if ((sdi->status == SR_ST_INITIALIZING) \|\|
189	(sdi->status == SR_ST_INACTIVE)) {
190	/*
191	* Check device by its physical USB bus/port address.
192	*/
193	usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
194	if (strcmp(sdi->connection_id, connection_id))
195	/* This is not the one. */
196	continue;
197	}
198
199	if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
200	if (usb->address == 0xff)
201	/*
202	* First time we touch this device after FW
203	* upload, so we don't know the address yet.
204	*/
205	usb->address = libusb_get_device_address(devlist[i]);
206	} else {
207	sr_err("Failed to open device: %s.",
208	libusb_error_name(ret));
209	break;
210	}
211
212	ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
213	if (ret == LIBUSB_ERROR_BUSY) {
214	sr_err("Unable to claim USB interface. Another "
215	"program or driver has already claimed it.");
216	break;
217	} else if (ret == LIBUSB_ERROR_NO_DEVICE) {
218	sr_err("Device has been disconnected.");
219	break;
220	} else if (ret != 0) {
221	sr_err("Unable to claim interface: %s.",
222	libusb_error_name(ret));
223	break;
224	}
225
226	if ((ret = twinkie_init_device(sdi)) != SR_OK) {
227	sr_err("Failed to init device.");
228	break;
229	}
230
231	sdi->status = SR_ST_ACTIVE;
232	sr_info("Opened device %d.%d, interface %d.",
233	usb->bus, usb->address, USB_INTERFACE);
234
235	break;
236	}
237	libusb_free_device_list(devlist, 1);
238
239	if (sdi->status != SR_ST_ACTIVE) {
240	if (usb->devhdl) {
241	libusb_release_interface(usb->devhdl, USB_INTERFACE);
242	libusb_close(usb->devhdl);
243	usb->devhdl = NULL;
244	}
245	return SR_ERR;
246	}
247
248	return SR_OK;
249	}
250
251	static int dev_open(struct sr_dev_inst *sdi)
252	{
253	int ret;
254
255	ret = twinkie_dev_open(sdi);
256	if (ret != SR_OK) {
257	sr_err("Unable to open device.");
258	return SR_ERR;
259	}
260
261	return SR_OK;
262	}
263
264	static int dev_close(struct sr_dev_inst *sdi)
265	{
266	struct sr_usb_dev_inst *usb;
267
268	usb = sdi->conn;
269	if (usb->devhdl == NULL)
270	return SR_ERR;
271
272	sr_info("Closing device %d.%d interface %d.",
273	usb->bus, usb->address, USB_INTERFACE);
274	libusb_release_interface(usb->devhdl, USB_INTERFACE);
275	libusb_close(usb->devhdl);
276	usb->devhdl = NULL;
277	sdi->status = SR_ST_INACTIVE;
278
279	return SR_OK;
280	}
281
282	static int dev_clear(const struct sr_dev_driver *di)
283	{
284	return std_dev_clear(di, NULL);
285	}
286
287	static int config_get(uint32_t key, GVariant **data,
288	const struct sr_dev_inst *sdi,
289	const struct sr_channel_group *cg)
290	{
291	struct sr_usb_dev_inst *usb;
292	char str[128];
293	int ret;
294
295	(void)cg;
296
297	ret = SR_OK;
298	switch (key) {
299	case SR_CONF_CONN:
300	if (!sdi \|\| !sdi->conn)
301	return SR_ERR_ARG;
302	usb = sdi->conn;
303	if (usb->address == 255)
304	/* Device still needs to re-enumerate after firmware
305	* upload, so we don't know its (future) address. */
306	return SR_ERR;
307	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
308	*data = g_variant_new_string(str);
309	break;
310	case SR_CONF_SAMPLERATE:
311	*data = g_variant_new_uint64(SAMPLE_RATE);
312	break;
313	default:
314	return SR_ERR_NA;
315	}
316
317	return ret;
318	}
319
320	static int config_set(uint32_t key, GVariant *data,
321	const struct sr_dev_inst *sdi,
322	const struct sr_channel_group *cg)
323	{
324	struct dev_context *devc;
325	int ret;
326
327	(void)cg;
328
329	if (sdi->status != SR_ST_ACTIVE)
330	return SR_ERR_DEV_CLOSED;
331
332	devc = sdi->priv;
333
334	ret = SR_OK;
335	switch (key) {
336	case SR_CONF_LIMIT_SAMPLES:
337	devc->limit_samples = g_variant_get_uint64(data);
338	break;
339	default:
340	ret = SR_ERR_NA;
341	}
342
343	return ret;
344	}
345
346	static int config_list(uint32_t key, GVariant **data,
347	const struct sr_dev_inst *sdi,
348	const struct sr_channel_group *cg)
349	{
350	int ret;
351
352	(void)sdi;
353	(void)cg;
354
355	ret = SR_OK;
356	switch (key) {
357	case SR_CONF_SCAN_OPTIONS:
358	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
359	hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
360	break;
361	case SR_CONF_DEVICE_OPTIONS:
362	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
363	hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
364	break;
365	default:
366	return SR_ERR_NA;
367	}
368
369	return ret;
370	}
371
372	static void abort_acquisition(struct dev_context *devc)
373	{
374	int i;
375
376	devc->sent_samples = -1;
377
378	for (i = devc->num_transfers - 1; i >= 0; i--) {
379	if (devc->transfers[i])
380	libusb_cancel_transfer(devc->transfers[i]);
381	}
382	}
383
384	static int receive_data(int fd, int revents, void *cb_data)
385	{
386	struct timeval tv;
387	struct dev_context *devc;
388	struct drv_context *drvc;
389	const struct sr_dev_inst *sdi;
390	struct sr_dev_driver *di;
391
392	(void)fd;
393	(void)revents;
394
395	sdi = cb_data;
396	di = sdi->driver;
397	drvc = di->context;
398	devc = sdi->priv;
399
400	tv.tv_sec = tv.tv_usec = 0;
401	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
402
403	if (devc->sent_samples == -2) {
404	abort_acquisition(devc);
405	}
406
407	return TRUE;
408	}
409
410	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
411	{
412	struct sr_dev_driver *di = sdi->driver;
413	struct dev_context *devc;
414	struct drv_context *drvc;
415	struct sr_usb_dev_inst *usb;
416	struct libusb_transfer *transfer;
417	unsigned int i, timeout, num_transfers;
418	int ret;
419	unsigned char *buf;
420	size_t size, convsize;
421
422	if (sdi->status != SR_ST_ACTIVE)
423	return SR_ERR_DEV_CLOSED;
424
425	drvc = di->context;
426	devc = sdi->priv;
427	usb = sdi->conn;
428
429	devc->sent_samples = 0;
430	/* reset per-CC context */
431	memset(devc->cc, 0, sizeof(devc->cc));
432
433	timeout = 1000;
434	num_transfers = 10;
435	size = 10*1024;
436	convsize = size * 8 * 256 /* largest size : only rollbacks/no edges */;
437	devc->submitted_transfers = 0;
438
439	devc->convbuffer_size = convsize;
440	if (!(devc->convbuffer = g_try_malloc(convsize))) {
441	sr_err("Conversion buffer malloc failed.");
442	return SR_ERR_MALLOC;
443	}
444	memset(devc->convbuffer, 0, devc->convbuffer_size);
445
446	devc->transfers = g_try_malloc0(sizeof(devc->transfers) num_transfers);
447	if (!devc->transfers) {
448	sr_err("USB transfers malloc failed.");
449	g_free(devc->convbuffer);
450	return SR_ERR_MALLOC;
451	}
452
453	devc->num_transfers = num_transfers;
454	for (i = 0; i < num_transfers; i++) {
455	if (!(buf = g_try_malloc(size))) {
456	sr_err("USB transfer buffer malloc failed.");
457	if (devc->submitted_transfers)
458	abort_acquisition(devc);
459	else {
460	g_free(devc->transfers);
461	g_free(devc->convbuffer);
462	}
463	return SR_ERR_MALLOC;
464	}
465	transfer = libusb_alloc_transfer(0);
466	libusb_fill_bulk_transfer(transfer, usb->devhdl,
467	3 \| LIBUSB_ENDPOINT_IN, buf, size,
468	twinkie_receive_transfer, (void *)sdi, timeout);
469	if ((ret = libusb_submit_transfer(transfer)) != 0) {
470	sr_err("Failed to submit transfer: %s.",
471	libusb_error_name(ret));
472	libusb_free_transfer(transfer);
473	g_free(buf);
474	abort_acquisition(devc);
475	return SR_ERR;
476	}
477	devc->transfers[i] = transfer;
478	devc->submitted_transfers++;
479	}
480
481	devc->ctx = drvc->sr_ctx;
482
483	usb_source_add(sdi->session, devc->ctx, timeout, receive_data,
484	(void *)sdi);
485
486	/* Send header packet to the session bus. */
487	std_session_send_df_header(sdi);
488
489	if ((ret = twinkie_start_acquisition(sdi)) != SR_OK) {
490	abort_acquisition(devc);
491	return ret;
492	}
493
494	return SR_OK;
495	}
496
497	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
498	{
499	if (sdi->status != SR_ST_ACTIVE)
500	return SR_ERR_DEV_CLOSED;
501
502	abort_acquisition(sdi->priv);
503
504	return SR_OK;
505	}
506
507	static struct sr_dev_driver chromium_twinkie_driver_info = {
508	.name = "chromium-twinkie",
509	.longname = "Chromium Twinkie",
510	.api_version = 1,
511	.init = std_init,
512	.cleanup = std_cleanup,
513	.scan = scan,
514	.dev_list = std_dev_list,
515	.dev_clear = dev_clear,
516	.config_get = config_get,
517	.config_set = config_set,
518	.config_list = config_list,
519	.dev_open = dev_open,
520	.dev_close = dev_close,
521	.dev_acquisition_start = dev_acquisition_start,
522	.dev_acquisition_stop = dev_acquisition_stop,
523	};
524	SR_REGISTER_DEV_DRIVER(chromium_twinkie_driver_info);