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

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2014 Kumar Abhishek <abhishek@theembeddedkitchen.net>
 *
 * 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 "protocol.h"
#include "beaglelogic.h"

/* Scan options */
static const uint32_t scanopts[] = {
	SR_CONF_NUM_LOGIC_CHANNELS,
};

static const uint32_t drvopts[] = {
	SR_CONF_LOGIC_ANALYZER,
};

/* Hardware capabilities */
static const uint32_t devopts[] = {
	SR_CONF_CONTINUOUS,
	SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
	SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET,
	SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
	SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
	SR_CONF_NUM_LOGIC_CHANNELS | SR_CONF_GET,
};

/* Trigger matching capabilities */
static const int32_t soft_trigger_matches[] = {
	SR_TRIGGER_ZERO,
	SR_TRIGGER_ONE,
	SR_TRIGGER_RISING,
	SR_TRIGGER_FALLING,
	SR_TRIGGER_EDGE,
};

SR_PRIV const char *channel_names[] = {
	"P8_45", "P8_46", "P8_43", "P8_44", "P8_41", "P8_42", "P8_39",
	"P8_40", "P8_27", "P8_29", "P8_28", "P8_30", "P8_21", "P8_20",
};

/* Possible sample rates : 10 Hz to 100 MHz = (100 / x) MHz */
static const uint64_t samplerates[] = {
	SR_HZ(10),
	SR_MHZ(100),
	SR_HZ(1),
};

static struct dev_context *beaglelogic_devc_alloc(void)
{
	struct dev_context *devc;

	devc = g_malloc0(sizeof(struct dev_context));

	/* Default non-zero values (if any) */
	devc->fd = -1;
	devc->limit_samples = (uint64_t)-1;

	return devc;
}

static GSList *scan(struct sr_dev_driver *di, GSList *options)
{
	GSList *l;
	struct sr_config *src;
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	int i, maxch;

	/* Probe for /dev/beaglelogic */
	if (!g_file_test(BEAGLELOGIC_DEV_NODE, G_FILE_TEST_EXISTS))
		return NULL;

	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	sdi->status = SR_ST_INACTIVE;
	sdi->model = g_strdup("BeagleLogic");
	sdi->version = g_strdup("1.0");

	/* Unless explicitly specified, keep max channels to 8 only */
	maxch = 8;
	for (l = options; l; l = l->next) {
		src = l->data;
		if (src->key == SR_CONF_NUM_LOGIC_CHANNELS)
			maxch = g_variant_get_int32(src->data);
	}

	/* We need to test for number of channels by opening the node */
	devc = beaglelogic_devc_alloc();

	if (beaglelogic_open_nonblock(devc) != SR_OK) {
		g_free(devc);
		sr_dev_inst_free(sdi);

		return NULL;
	}

	if (maxch > 8) {
		maxch = NUM_CHANNELS;
		devc->sampleunit = BL_SAMPLEUNIT_16_BITS;
	} else {
		maxch = 8;
		devc->sampleunit = BL_SAMPLEUNIT_8_BITS;
	}

	beaglelogic_set_sampleunit(devc);
	beaglelogic_close(devc);

	/* Signal */
	sr_info("BeagleLogic device found at "BEAGLELOGIC_DEV_NODE);

	/* Fill the channels */
	for (i = 0; i < maxch; i++)
		sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE,
				channel_names[i]);

	sdi->priv = devc;

	return std_scan_complete(di, g_slist_append(NULL, sdi));
}

static int dev_open(struct sr_dev_inst *sdi)
{
	struct dev_context *devc = sdi->priv;

	/* Open BeagleLogic */
	if (beaglelogic_open_nonblock(devc))
		return SR_ERR;

	/* Set fd and local attributes */
	devc->pollfd.fd = devc->fd;
	devc->pollfd.events = G_IO_IN;
	devc->pollfd.revents = 0;

	/* Get the default attributes */
	beaglelogic_get_samplerate(devc);
	beaglelogic_get_sampleunit(devc);
	beaglelogic_get_triggerflags(devc);
	beaglelogic_get_buffersize(devc);
	beaglelogic_get_bufunitsize(devc);

	/* Map the kernel capture FIFO for reads, saves 1 level of memcpy */
	if (beaglelogic_mmap(devc) != SR_OK) {
		sr_err("Unable to map capture buffer");
		beaglelogic_close(devc);
		return SR_ERR;
	}

	return SR_OK;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	struct dev_context *devc = sdi->priv;

	/* Close the memory mapping and the file */
	beaglelogic_munmap(devc);
	beaglelogic_close(devc);

	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;

	(void)cg;

	switch (key) {
	case SR_CONF_LIMIT_SAMPLES:
		*data = g_variant_new_uint64(devc->limit_samples);
		break;
	case SR_CONF_SAMPLERATE:
		*data = g_variant_new_uint64(devc->cur_samplerate);
		break;
	case SR_CONF_CAPTURE_RATIO:
		*data = g_variant_new_uint64(devc->capture_ratio);
		break;
	case SR_CONF_NUM_LOGIC_CHANNELS:
		*data = g_variant_new_uint32(g_slist_length(sdi->channels));
		break;
	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;
	uint64_t tmp_u64;

	(void)cg;

	switch (key) {
	case SR_CONF_SAMPLERATE:
		devc->cur_samplerate = g_variant_get_uint64(data);
		return beaglelogic_set_samplerate(devc);
	case SR_CONF_LIMIT_SAMPLES:
		tmp_u64 = g_variant_get_uint64(data);
		devc->limit_samples = tmp_u64;
		devc->triggerflags = BL_TRIGGERFLAGS_ONESHOT;

		/* Check if we have sufficient buffer size */
		tmp_u64 *= SAMPLEUNIT_TO_BYTES(devc->sampleunit);
		if (tmp_u64 > devc->buffersize) {
			sr_warn("Insufficient buffer space has been allocated.");
			sr_warn("Please use \'echo <size in bytes> > "\
				BEAGLELOGIC_SYSFS_ATTR(memalloc) \
				"\' as root to increase the buffer size, this"\
				" capture is now truncated to %d Msamples",
				devc->buffersize /
				(SAMPLEUNIT_TO_BYTES(devc->sampleunit) * 1000000));
		}
		return beaglelogic_set_triggerflags(devc);
	case SR_CONF_CAPTURE_RATIO:
		devc->capture_ratio = g_variant_get_uint64(data);
		if (devc->capture_ratio > 100)
			return SR_ERR;
		return SR_OK;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

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

	switch (key) {
	case SR_CONF_SCAN_OPTIONS:
	case SR_CONF_DEVICE_OPTIONS:
		return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
	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;
	case SR_CONF_TRIGGER_MATCH:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				soft_trigger_matches, ARRAY_SIZE(soft_trigger_matches),
				sizeof(int32_t));
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

/* get a sane timeout for poll() */
#define BUFUNIT_TIMEOUT_MS(devc)	(100 + ((devc->bufunitsize * 1000) / \
				(uint32_t)(devc->cur_samplerate)))

static int dev_acquisition_start(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc = sdi->priv;
	struct sr_trigger *trigger;

	/* Clear capture state */
	devc->bytes_read = 0;
	devc->offset = 0;

	/* Configure channels */
	devc->sampleunit = g_slist_length(sdi->channels) > 8 ?
			BL_SAMPLEUNIT_16_BITS : BL_SAMPLEUNIT_8_BITS;
	beaglelogic_set_sampleunit(devc);

	/* Configure triggers & send header packet */
	if ((trigger = sr_session_trigger_get(sdi->session))) {
		int pre_trigger_samples = 0;
		if (devc->limit_samples > 0)
			pre_trigger_samples = devc->capture_ratio * devc->limit_samples/100;
		devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
		if (!devc->stl)
			return SR_ERR_MALLOC;
		devc->trigger_fired = FALSE;
	} else
		devc->trigger_fired = TRUE;
	std_session_send_df_header(sdi);

	/* Trigger and add poll on file */
	beaglelogic_start(devc);
	sr_session_source_add_pollfd(sdi->session, &devc->pollfd,
			BUFUNIT_TIMEOUT_MS(devc), beaglelogic_receive_data,
			(void *)sdi);

	return SR_OK;
}

static int dev_acquisition_stop(struct sr_dev_inst *sdi)
{
	struct dev_context *devc = sdi->priv;

	/* Execute a stop on BeagleLogic */
	beaglelogic_stop(devc);

	/* lseek to offset 0, flushes the cache */
	lseek(devc->fd, 0, SEEK_SET);

	/* Remove session source and send EOT packet */
	sr_session_source_remove_pollfd(sdi->session, &devc->pollfd);
	std_session_send_df_end(sdi);

	return SR_OK;
}

static struct sr_dev_driver beaglelogic_driver_info = {
	.name = "beaglelogic",
	.longname = "BeagleLogic",
	.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(beaglelogic_driver_info);
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2014 Kumar Abhishek <abhishek@theembeddedkitchen.net>
	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 "protocol.h"
	22	#include "beaglelogic.h"
	23
	24	/* Scan options */
	25	static const uint32_t scanopts[] = {
	26	SR_CONF_NUM_LOGIC_CHANNELS,
	27	};
	28
	29	static const uint32_t drvopts[] = {
	30	SR_CONF_LOGIC_ANALYZER,
	31	};
	32
	33	/* Hardware capabilities */
	34	static const uint32_t devopts[] = {
	35	SR_CONF_CONTINUOUS,
	36	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
	37	SR_CONF_SAMPLERATE \| SR_CONF_GET \| SR_CONF_SET,
	38	SR_CONF_TRIGGER_MATCH \| SR_CONF_LIST,
	39	SR_CONF_CAPTURE_RATIO \| SR_CONF_GET \| SR_CONF_SET,
	40	SR_CONF_NUM_LOGIC_CHANNELS \| SR_CONF_GET,
	41	};
	42
	43	/* Trigger matching capabilities */
	44	static const int32_t soft_trigger_matches[] = {
	45	SR_TRIGGER_ZERO,
	46	SR_TRIGGER_ONE,
	47	SR_TRIGGER_RISING,
	48	SR_TRIGGER_FALLING,
	49	SR_TRIGGER_EDGE,
	50	};
	51
	52	SR_PRIV const char *channel_names[] = {
	53	"P8_45", "P8_46", "P8_43", "P8_44", "P8_41", "P8_42", "P8_39",
	54	"P8_40", "P8_27", "P8_29", "P8_28", "P8_30", "P8_21", "P8_20",
	55	};
	56
	57	/* Possible sample rates : 10 Hz to 100 MHz = (100 / x) MHz */
	58	static const uint64_t samplerates[] = {
	59	SR_HZ(10),
	60	SR_MHZ(100),
	61	SR_HZ(1),
	62	};
	63
	64	static struct dev_context *beaglelogic_devc_alloc(void)
	65	{
	66	struct dev_context *devc;
	67
	68	devc = g_malloc0(sizeof(struct dev_context));
	69
	70	/* Default non-zero values (if any) */
	71	devc->fd = -1;
	72	devc->limit_samples = (uint64_t)-1;
	73
	74	return devc;
	75	}
	76
	77	static GSList scan(struct sr_dev_driver di, GSList *options)
	78	{
	79	GSList *l;
	80	struct sr_config *src;
	81	struct sr_dev_inst *sdi;
	82	struct dev_context *devc;
	83	int i, maxch;
	84
	85	/* Probe for /dev/beaglelogic */
	86	if (!g_file_test(BEAGLELOGIC_DEV_NODE, G_FILE_TEST_EXISTS))
	87	return NULL;
	88
	89	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	90	sdi->status = SR_ST_INACTIVE;
	91	sdi->model = g_strdup("BeagleLogic");
	92	sdi->version = g_strdup("1.0");
	93
	94	/* Unless explicitly specified, keep max channels to 8 only */
	95	maxch = 8;
	96	for (l = options; l; l = l->next) {
	97	src = l->data;
	98	if (src->key == SR_CONF_NUM_LOGIC_CHANNELS)
	99	maxch = g_variant_get_int32(src->data);
	100	}
	101
	102	/* We need to test for number of channels by opening the node */
	103	devc = beaglelogic_devc_alloc();
	104
	105	if (beaglelogic_open_nonblock(devc) != SR_OK) {
	106	g_free(devc);
	107	sr_dev_inst_free(sdi);
	108
	109	return NULL;
	110	}
	111
	112	if (maxch > 8) {
	113	maxch = NUM_CHANNELS;
	114	devc->sampleunit = BL_SAMPLEUNIT_16_BITS;
	115	} else {
	116	maxch = 8;
	117	devc->sampleunit = BL_SAMPLEUNIT_8_BITS;
	118	}
	119
	120	beaglelogic_set_sampleunit(devc);
	121	beaglelogic_close(devc);
	122
	123	/* Signal */
	124	sr_info("BeagleLogic device found at "BEAGLELOGIC_DEV_NODE);
	125
	126	/* Fill the channels */
	127	for (i = 0; i < maxch; i++)
	128	sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE,
	129	channel_names[i]);
	130
	131	sdi->priv = devc;
	132
	133	return std_scan_complete(di, g_slist_append(NULL, sdi));
	134	}
	135
	136	static int dev_open(struct sr_dev_inst *sdi)
	137	{
	138	struct dev_context *devc = sdi->priv;
	139
	140	/* Open BeagleLogic */
	141	if (beaglelogic_open_nonblock(devc))
	142	return SR_ERR;
	143
	144	/* Set fd and local attributes */
	145	devc->pollfd.fd = devc->fd;
	146	devc->pollfd.events = G_IO_IN;
	147	devc->pollfd.revents = 0;
	148
	149	/* Get the default attributes */
	150	beaglelogic_get_samplerate(devc);
	151	beaglelogic_get_sampleunit(devc);
	152	beaglelogic_get_triggerflags(devc);
	153	beaglelogic_get_buffersize(devc);
	154	beaglelogic_get_bufunitsize(devc);
	155
	156	/* Map the kernel capture FIFO for reads, saves 1 level of memcpy */
	157	if (beaglelogic_mmap(devc) != SR_OK) {
	158	sr_err("Unable to map capture buffer");
	159	beaglelogic_close(devc);
	160	return SR_ERR;
	161	}
	162
	163	return SR_OK;
	164	}
	165
	166	static int dev_close(struct sr_dev_inst *sdi)
	167	{
	168	struct dev_context *devc = sdi->priv;
	169
	170	/* Close the memory mapping and the file */
	171	beaglelogic_munmap(devc);
	172	beaglelogic_close(devc);
	173
	174	return SR_OK;
	175	}
	176
	177	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	178	const struct sr_channel_group *cg)
	179	{
	180	struct dev_context *devc = sdi->priv;
	181
	182	(void)cg;
	183
	184	switch (key) {
	185	case SR_CONF_LIMIT_SAMPLES:
	186	*data = g_variant_new_uint64(devc->limit_samples);
	187	break;
	188	case SR_CONF_SAMPLERATE:
	189	*data = g_variant_new_uint64(devc->cur_samplerate);
	190	break;
	191	case SR_CONF_CAPTURE_RATIO:
	192	*data = g_variant_new_uint64(devc->capture_ratio);
	193	break;
	194	case SR_CONF_NUM_LOGIC_CHANNELS:
	195	*data = g_variant_new_uint32(g_slist_length(sdi->channels));
	196	break;
	197	default:
	198	return SR_ERR_NA;
	199	}
	200
	201	return SR_OK;
	202	}
	203
	204	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
	205	const struct sr_channel_group *cg)
	206	{
	207	struct dev_context *devc = sdi->priv;
	208	uint64_t tmp_u64;
	209
	210	(void)cg;
	211
	212	switch (key) {
	213	case SR_CONF_SAMPLERATE:
	214	devc->cur_samplerate = g_variant_get_uint64(data);
	215	return beaglelogic_set_samplerate(devc);
	216	case SR_CONF_LIMIT_SAMPLES:
	217	tmp_u64 = g_variant_get_uint64(data);
	218	devc->limit_samples = tmp_u64;
	219	devc->triggerflags = BL_TRIGGERFLAGS_ONESHOT;
	220
	221	/* Check if we have sufficient buffer size */
	222	tmp_u64 *= SAMPLEUNIT_TO_BYTES(devc->sampleunit);
	223	if (tmp_u64 > devc->buffersize) {
	224	sr_warn("Insufficient buffer space has been allocated.");
	225	sr_warn("Please use \'echo <size in bytes> > "\
	226	BEAGLELOGIC_SYSFS_ATTR(memalloc) \
	227	"\' as root to increase the buffer size, this"\
	228	" capture is now truncated to %d Msamples",
	229	devc->buffersize /
	230	(SAMPLEUNIT_TO_BYTES(devc->sampleunit) * 1000000));
	231	}
	232	return beaglelogic_set_triggerflags(devc);
	233	case SR_CONF_CAPTURE_RATIO:
	234	devc->capture_ratio = g_variant_get_uint64(data);
	235	if (devc->capture_ratio > 100)
	236	return SR_ERR;
	237	return SR_OK;
	238	default:
	239	return SR_ERR_NA;
	240	}
	241
	242	return SR_OK;
	243	}
	244
	245	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	246	const struct sr_channel_group *cg)
	247	{
	248	GVariant *gvar;
	249	GVariantBuilder gvb;
	250
	251	switch (key) {
	252	case SR_CONF_SCAN_OPTIONS:
	253	case SR_CONF_DEVICE_OPTIONS:
	254	return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
	255	case SR_CONF_SAMPLERATE:
	256	g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
	257	gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
	258	samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
	259	g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
	260	*data = g_variant_builder_end(&gvb);
	261	break;
	262	case SR_CONF_TRIGGER_MATCH:
	263	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	264	soft_trigger_matches, ARRAY_SIZE(soft_trigger_matches),
	265	sizeof(int32_t));
	266	break;
	267	default:
	268	return SR_ERR_NA;
	269	}
	270
	271	return SR_OK;
	272	}
	273
	274	/* get a sane timeout for poll() */
	275	#define BUFUNIT_TIMEOUT_MS(devc) (100 + ((devc->bufunitsize * 1000) / \
	276	(uint32_t)(devc->cur_samplerate)))
	277
	278	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	279	{
	280	struct dev_context *devc = sdi->priv;
	281	struct sr_trigger *trigger;
	282
	283	/* Clear capture state */
	284	devc->bytes_read = 0;
	285	devc->offset = 0;
	286
	287	/* Configure channels */
	288	devc->sampleunit = g_slist_length(sdi->channels) > 8 ?
	289	BL_SAMPLEUNIT_16_BITS : BL_SAMPLEUNIT_8_BITS;
	290	beaglelogic_set_sampleunit(devc);
	291
	292	/* Configure triggers & send header packet */
	293	if ((trigger = sr_session_trigger_get(sdi->session))) {
	294	int pre_trigger_samples = 0;
	295	if (devc->limit_samples > 0)
	296	pre_trigger_samples = devc->capture_ratio * devc->limit_samples/100;
	297	devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
	298	if (!devc->stl)
	299	return SR_ERR_MALLOC;
	300	devc->trigger_fired = FALSE;
	301	} else
	302	devc->trigger_fired = TRUE;
	303	std_session_send_df_header(sdi);
	304
	305	/* Trigger and add poll on file */
	306	beaglelogic_start(devc);
	307	sr_session_source_add_pollfd(sdi->session, &devc->pollfd,
	308	BUFUNIT_TIMEOUT_MS(devc), beaglelogic_receive_data,
	309	(void *)sdi);
	310
	311	return SR_OK;
	312	}
	313
	314	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	315	{
	316	struct dev_context *devc = sdi->priv;
	317
	318	/* Execute a stop on BeagleLogic */
	319	beaglelogic_stop(devc);
	320
	321	/* lseek to offset 0, flushes the cache */
	322	lseek(devc->fd, 0, SEEK_SET);
	323
	324	/* Remove session source and send EOT packet */
	325	sr_session_source_remove_pollfd(sdi->session, &devc->pollfd);
	326	std_session_send_df_end(sdi);
	327
	328	return SR_OK;
	329	}
	330
	331	static struct sr_dev_driver beaglelogic_driver_info = {
	332	.name = "beaglelogic",
	333	.longname = "BeagleLogic",
	334	.api_version = 1,
	335	.init = std_init,
	336	.cleanup = std_cleanup,
	337	.scan = scan,
	338	.dev_list = std_dev_list,
	339	.dev_clear = std_dev_clear,
	340	.config_get = config_get,
	341	.config_set = config_set,
	342	.config_list = config_list,
	343	.dev_open = dev_open,
	344	.dev_close = dev_close,
	345	.dev_acquisition_start = dev_acquisition_start,
	346	.dev_acquisition_stop = dev_acquisition_stop,
	347	.context = NULL,
	348	};
	349	SR_REGISTER_DEV_DRIVER(beaglelogic_driver_info);