[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,
};

/* Hardware capabilities */
static const uint32_t devopts[] = {
	SR_CONF_LOGIC_ANALYZER,
	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)
{
	struct drv_context *drvc;
	GSList *devices, *l;
	struct sr_config *src;
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	int i, maxch;

	devices = NULL;
	drvc = di->context;
	drvc->instances = NULL;

	/* 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");
	sdi->driver = di;

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

	return devices;
}

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;
	}

	/* We're good to go now */
	sdi->status = SR_ST_ACTIVE;
	return SR_OK;
}

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

	if (sdi->status == SR_ST_ACTIVE) {
		/* Close the memory mapping and the file */
		beaglelogic_munmap(devc);
		beaglelogic_close(devc);
	}
	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;

	(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;

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

	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)
{
	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;
	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 ret;
}

/* 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;

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

	/* 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, LOG_PREFIX);

	/* 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;

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

	/* 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, LOG_PREFIX);

	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,
	.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	/* Hardware capabilities */
	30	static const uint32_t devopts[] = {
	31	SR_CONF_LOGIC_ANALYZER,
	32	SR_CONF_CONTINUOUS,
	33	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
	34	SR_CONF_SAMPLERATE \| SR_CONF_GET \| SR_CONF_SET,
	35	SR_CONF_TRIGGER_MATCH \| SR_CONF_LIST,
	36	SR_CONF_CAPTURE_RATIO \| SR_CONF_GET \| SR_CONF_SET,
	37	SR_CONF_NUM_LOGIC_CHANNELS \| SR_CONF_GET,
	38	};
	39
	40	/* Trigger matching capabilities */
	41	static const int32_t soft_trigger_matches[] = {
	42	SR_TRIGGER_ZERO,
	43	SR_TRIGGER_ONE,
	44	SR_TRIGGER_RISING,
	45	SR_TRIGGER_FALLING,
	46	SR_TRIGGER_EDGE,
	47	};
	48
	49	SR_PRIV const char *channel_names[] = {
	50	"P8_45", "P8_46", "P8_43", "P8_44", "P8_41", "P8_42", "P8_39",
	51	"P8_40", "P8_27", "P8_29", "P8_28", "P8_30", "P8_21", "P8_20",
	52	};
	53
	54	/* Possible sample rates : 10 Hz to 100 MHz = (100 / x) MHz */
	55	static const uint64_t samplerates[] = {
	56	SR_HZ(10),
	57	SR_MHZ(100),
	58	SR_HZ(1),
	59	};
	60
	61	static struct dev_context *beaglelogic_devc_alloc(void)
	62	{
	63	struct dev_context *devc;
	64
	65	devc = g_malloc0(sizeof(struct dev_context));
	66
	67	/* Default non-zero values (if any) */
	68	devc->fd = -1;
	69	devc->limit_samples = (uint64_t)-1;
	70
	71	return devc;
	72	}
	73
	74	static GSList scan(struct sr_dev_driver di, GSList *options)
	75	{
	76	struct drv_context *drvc;
	77	GSList devices, l;
	78	struct sr_config *src;
	79	struct sr_dev_inst *sdi;
	80	struct dev_context *devc;
	81	int i, maxch;
	82
	83	devices = NULL;
	84	drvc = di->context;
	85	drvc->instances = NULL;
	86
	87	/* Probe for /dev/beaglelogic */
	88	if (!g_file_test(BEAGLELOGIC_DEV_NODE, G_FILE_TEST_EXISTS))
	89	return NULL;
	90
	91	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	92	sdi->status = SR_ST_INACTIVE;
	93	sdi->model = g_strdup("BeagleLogic");
	94	sdi->version = g_strdup("1.0");
	95	sdi->driver = di;
	96
	97	/* Unless explicitly specified, keep max channels to 8 only */
	98	maxch = 8;
	99	for (l = options; l; l = l->next) {
	100	src = l->data;
	101	if (src->key == SR_CONF_NUM_LOGIC_CHANNELS)
	102	maxch = g_variant_get_int32(src->data);
	103	}
	104
	105	/* We need to test for number of channels by opening the node */
	106	devc = beaglelogic_devc_alloc();
	107
	108	if (beaglelogic_open_nonblock(devc) != SR_OK) {
	109	g_free(devc);
	110	sr_dev_inst_free(sdi);
	111
	112	return NULL;
	113	}
	114
	115	if (maxch > 8) {
	116	maxch = NUM_CHANNELS;
	117	devc->sampleunit = BL_SAMPLEUNIT_16_BITS;
	118	} else {
	119	maxch = 8;
	120	devc->sampleunit = BL_SAMPLEUNIT_8_BITS;
	121	}
	122
	123	beaglelogic_set_sampleunit(devc);
	124	beaglelogic_close(devc);
	125
	126	/* Signal */
	127	sr_info("BeagleLogic device found at "BEAGLELOGIC_DEV_NODE);
	128
	129	/* Fill the channels */
	130	for (i = 0; i < maxch; i++)
	131	sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE,
	132	channel_names[i]);
	133
	134	sdi->priv = devc;
	135	drvc->instances = g_slist_append(drvc->instances, sdi);
	136	devices = g_slist_append(devices, sdi);
	137
	138	return devices;
	139	}
	140
	141	static int dev_open(struct sr_dev_inst *sdi)
	142	{
	143	struct dev_context *devc = sdi->priv;
	144
	145	/* Open BeagleLogic */
	146	if (beaglelogic_open_nonblock(devc))
	147	return SR_ERR;
	148
	149	/* Set fd and local attributes */
	150	devc->pollfd.fd = devc->fd;
	151	devc->pollfd.events = G_IO_IN;
	152	devc->pollfd.revents = 0;
	153
	154	/* Get the default attributes */
	155	beaglelogic_get_samplerate(devc);
	156	beaglelogic_get_sampleunit(devc);
	157	beaglelogic_get_triggerflags(devc);
	158	beaglelogic_get_buffersize(devc);
	159	beaglelogic_get_bufunitsize(devc);
	160
	161	/* Map the kernel capture FIFO for reads, saves 1 level of memcpy */
	162	if (beaglelogic_mmap(devc) != SR_OK) {
	163	sr_err("Unable to map capture buffer");
	164	beaglelogic_close(devc);
	165	return SR_ERR;
	166	}
	167
	168	/* We're good to go now */
	169	sdi->status = SR_ST_ACTIVE;
	170	return SR_OK;
	171	}
	172
	173	static int dev_close(struct sr_dev_inst *sdi)
	174	{
	175	struct dev_context *devc = sdi->priv;
	176
	177	if (sdi->status == SR_ST_ACTIVE) {
	178	/* Close the memory mapping and the file */
	179	beaglelogic_munmap(devc);
	180	beaglelogic_close(devc);
	181	}
	182	sdi->status = SR_ST_INACTIVE;
	183	return SR_OK;
	184	}
	185
	186	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	187	const struct sr_channel_group *cg)
	188	{
	189	struct dev_context *devc = sdi->priv;
	190
	191	(void)cg;
	192
	193	switch (key) {
	194	case SR_CONF_LIMIT_SAMPLES:
	195	*data = g_variant_new_uint64(devc->limit_samples);
	196	break;
	197	case SR_CONF_SAMPLERATE:
	198	*data = g_variant_new_uint64(devc->cur_samplerate);
	199	break;
	200	case SR_CONF_CAPTURE_RATIO:
	201	*data = g_variant_new_uint64(devc->capture_ratio);
	202	break;
	203	case SR_CONF_NUM_LOGIC_CHANNELS:
	204	*data = g_variant_new_uint32(g_slist_length(sdi->channels));
	205	break;
	206	default:
	207	return SR_ERR_NA;
	208	}
	209
	210	return SR_OK;
	211	}
	212
	213	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
	214	const struct sr_channel_group *cg)
	215	{
	216	struct dev_context *devc = sdi->priv;
	217	uint64_t tmp_u64;
	218
	219	(void)cg;
	220
	221	if (sdi->status != SR_ST_ACTIVE)
	222	return SR_ERR_DEV_CLOSED;
	223
	224	switch (key) {
	225	case SR_CONF_SAMPLERATE:
	226	devc->cur_samplerate = g_variant_get_uint64(data);
	227	return beaglelogic_set_samplerate(devc);
	228	case SR_CONF_LIMIT_SAMPLES:
	229	tmp_u64 = g_variant_get_uint64(data);
	230	devc->limit_samples = tmp_u64;
	231	devc->triggerflags = BL_TRIGGERFLAGS_ONESHOT;
	232
	233	/* Check if we have sufficient buffer size */
	234	tmp_u64 *= SAMPLEUNIT_TO_BYTES(devc->sampleunit);
	235	if (tmp_u64 > devc->buffersize) {
	236	sr_warn("Insufficient buffer space has been allocated.");
	237	sr_warn("Please use \'echo <size in bytes> > "\
	238	BEAGLELOGIC_SYSFS_ATTR(memalloc) \
	239	"\' as root to increase the buffer size, this"\
	240	" capture is now truncated to %d Msamples",
	241	devc->buffersize /
	242	(SAMPLEUNIT_TO_BYTES(devc->sampleunit) * 1000000));
	243	}
	244	return beaglelogic_set_triggerflags(devc);
	245	case SR_CONF_CAPTURE_RATIO:
	246	devc->capture_ratio = g_variant_get_uint64(data);
	247	if (devc->capture_ratio > 100)
	248	return SR_ERR;
	249	return SR_OK;
	250	default:
	251	return SR_ERR_NA;
	252	}
	253
	254	return SR_OK;
	255	}
	256
	257	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	258	const struct sr_channel_group *cg)
	259	{
	260	int ret;
	261	GVariant *gvar;
	262	GVariantBuilder gvb;
	263
	264	(void)sdi;
	265	(void)cg;
	266
	267	ret = SR_OK;
	268	switch (key) {
	269	case SR_CONF_SCAN_OPTIONS:
	270	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	271	scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
	272	break;
	273	case SR_CONF_DEVICE_OPTIONS:
	274	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	275	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
	276	break;
	277	case SR_CONF_SAMPLERATE:
	278	g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
	279	gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
	280	samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
	281	g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
	282	*data = g_variant_builder_end(&gvb);
	283	break;
	284	case SR_CONF_TRIGGER_MATCH:
	285	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	286	soft_trigger_matches, ARRAY_SIZE(soft_trigger_matches),
	287	sizeof(int32_t));
	288	break;
	289	default:
	290	return SR_ERR_NA;
	291	}
	292
	293	return ret;
	294	}
	295
	296	/* get a sane timeout for poll() */
	297	#define BUFUNIT_TIMEOUT_MS(devc) (100 + ((devc->bufunitsize * 1000) / \
	298	(uint32_t)(devc->cur_samplerate)))
	299
	300	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	301	{
	302	struct dev_context *devc = sdi->priv;
	303	struct sr_trigger *trigger;
	304
	305	if (sdi->status != SR_ST_ACTIVE)
	306	return SR_ERR_DEV_CLOSED;
	307
	308	/* Clear capture state */
	309	devc->bytes_read = 0;
	310	devc->offset = 0;
	311
	312	/* Configure channels */
	313	devc->sampleunit = g_slist_length(sdi->channels) > 8 ?
	314	BL_SAMPLEUNIT_16_BITS : BL_SAMPLEUNIT_8_BITS;
	315	beaglelogic_set_sampleunit(devc);
	316
	317	/* Configure triggers & send header packet */
	318	if ((trigger = sr_session_trigger_get(sdi->session))) {
	319	int pre_trigger_samples = 0;
	320	if (devc->limit_samples > 0)
	321	pre_trigger_samples = devc->capture_ratio * devc->limit_samples/100;
	322	devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
	323	if (!devc->stl)
	324	return SR_ERR_MALLOC;
	325	devc->trigger_fired = FALSE;
	326	} else
	327	devc->trigger_fired = TRUE;
	328	std_session_send_df_header(sdi, LOG_PREFIX);
	329
	330	/* Trigger and add poll on file */
	331	beaglelogic_start(devc);
	332	sr_session_source_add_pollfd(sdi->session, &devc->pollfd,
	333	BUFUNIT_TIMEOUT_MS(devc), beaglelogic_receive_data,
	334	(void *)sdi);
	335
	336	return SR_OK;
	337	}
	338
	339	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	340	{
	341	struct dev_context *devc = sdi->priv;
	342
	343	if (sdi->status != SR_ST_ACTIVE)
	344	return SR_ERR_DEV_CLOSED;
	345
	346	/* Execute a stop on BeagleLogic */
	347	beaglelogic_stop(devc);
	348
	349	/* lseek to offset 0, flushes the cache */
	350	lseek(devc->fd, 0, SEEK_SET);
	351
	352	/* Remove session source and send EOT packet */
	353	sr_session_source_remove_pollfd(sdi->session, &devc->pollfd);
	354	std_session_send_df_end(sdi, LOG_PREFIX);
	355
	356	return SR_OK;
	357	}
	358
	359	static struct sr_dev_driver beaglelogic_driver_info = {
	360	.name = "beaglelogic",
	361	.longname = "BeagleLogic",
	362	.api_version = 1,
	363	.init = std_init,
	364	.cleanup = std_cleanup,
	365	.scan = scan,
	366	.dev_list = std_dev_list,
	367	.config_get = config_get,
	368	.config_set = config_set,
	369	.config_list = config_list,
	370	.dev_open = dev_open,
	371	.dev_close = dev_close,
	372	.dev_acquisition_start = dev_acquisition_start,
	373	.dev_acquisition_stop = dev_acquisition_stop,
	374	.context = NULL,
	375	};
	376	SR_REGISTER_DEV_DRIVER(beaglelogic_driver_info);