[libsigrok.git] / src / hardware / baylibre-acme / api.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2015 Bartosz Golaszewski <bgolaszewski@baylibre.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 "protocol.h"
#include <time.h>
#include <sys/timerfd.h>

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

/*
 * Currently there are two channel-group/probe options for ACME:
 *   - SR_CONF_PROBE_FACTOR - allows to modify current shunt resistance
 *     calibration
 *   - SR_CONF_POWER_OFF - allows to remotely cut-off/restore power to
 *     measured devices
 *
 * They are not static - we have to check each probe's capabilities in
 * config_list().
 */
#define MAX_DEVOPTS_CG		2
#define HAS_PROBE_FACTOR	(SR_CONF_PROBE_FACTOR | SR_CONF_GET | SR_CONF_SET)
#define HAS_POWER_OFF		(SR_CONF_POWER_OFF | SR_CONF_GET | SR_CONF_SET)

#define MAX_SAMPLE_RATE 500 /* In Hz */

static const uint64_t samplerates[] = {
	SR_HZ(1),
	SR_HZ(MAX_SAMPLE_RATE),
	SR_HZ(1),
};

static GSList *scan(struct sr_dev_driver *di, GSList *options)
{
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	gboolean status;
	int i;

	(void)options;

	devc = g_malloc0(sizeof(struct dev_context));
	devc->samplerate = SR_HZ(10);

	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	sdi->status = SR_ST_INACTIVE;
	sdi->vendor = g_strdup("BayLibre");
	sdi->model = g_strdup("ACME");
	sdi->priv = devc;

	status = bl_acme_is_sane();
	if (!status)
		goto err_out;

	/*
	 * Iterate over all ACME connectors and check if any probes
	 * are present.
	 */
	for (i = 0; i < MAX_PROBES; i++) {
		/*
		 * First check if there's an energy probe on this connector. If
		 * not, and we're already at the fifth probe - see if we can
		 * detect a temperature probe.
		 */
		status = bl_acme_detect_probe(bl_acme_get_enrg_addr(i),
					      PROBE_NUM(i), ENRG_PROBE_NAME);
		if (status) {
			/* Energy probe detected. */
			status = bl_acme_register_probe(sdi, PROBE_ENRG,
					bl_acme_get_enrg_addr(i), PROBE_NUM(i));
			if (!status) {
				sr_err("Error registering power probe %d",
				       PROBE_NUM(i));
				continue;
			}
		} else if (i >= TEMP_PRB_START_INDEX) {
			status = bl_acme_detect_probe(bl_acme_get_temp_addr(i),
					      PROBE_NUM(i), TEMP_PROBE_NAME);
			if (status) {
				/* Temperature probe detected. */
				status = bl_acme_register_probe(sdi,PROBE_TEMP,
					bl_acme_get_temp_addr(i), PROBE_NUM(i));
				if (!status) {
					sr_err("Error registering temp "
					       "probe %d", PROBE_NUM(i));
					continue;
				}
			}
		}
	}

	/*
	 * Let's assume there's no ACME device present if no probe
	 * has been registered.
	 */
	if (!sdi->channel_groups)
		goto err_out;

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

err_out:
	g_free(devc);
	sr_dev_inst_free(sdi);

	return NULL;
}

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

	return SR_OK;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	(void)sdi;

	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;
	int ret;
	uint64_t shunt;
	gboolean power_off;

	devc = sdi->priv;

	ret = SR_OK;
	switch (key) {
	case SR_CONF_LIMIT_SAMPLES:
	case SR_CONF_LIMIT_MSEC:
		ret = sr_sw_limits_config_get(&devc->limits, key, data);
		break;
	case SR_CONF_SAMPLERATE:
		*data = g_variant_new_uint64(devc->samplerate);
		break;
	case SR_CONF_PROBE_FACTOR:
		if (!cg)
			return SR_ERR_CHANNEL_GROUP;
		ret = bl_acme_get_shunt(cg, &shunt);
		if (ret == SR_OK)
			*data = g_variant_new_uint64(shunt);
		break;
	case SR_CONF_POWER_OFF:
		if (!cg)
			return SR_ERR_CHANNEL_GROUP;
		ret = bl_acme_read_power_state(cg, &power_off);
		if (ret == SR_OK)
			*data = g_variant_new_boolean(power_off);
		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;
	uint64_t samplerate;
	int ret;

	devc = sdi->priv;

	ret = SR_OK;
	switch (key) {
	case SR_CONF_LIMIT_SAMPLES:
	case SR_CONF_LIMIT_MSEC:
		ret = sr_sw_limits_config_set(&devc->limits, key, data);
		break;
	case SR_CONF_SAMPLERATE:
		samplerate = g_variant_get_uint64(data);
		if (samplerate > MAX_SAMPLE_RATE) {
			sr_err("Maximum sample rate is %d", MAX_SAMPLE_RATE);
			ret = SR_ERR_SAMPLERATE;
			break;
		}
		devc->samplerate = samplerate;
		bl_acme_maybe_set_update_interval(sdi, samplerate);
		break;
	case SR_CONF_PROBE_FACTOR:
		if (!cg)
			return SR_ERR_CHANNEL_GROUP;
		ret = bl_acme_set_shunt(cg, g_variant_get_uint64(data));
		break;
	case SR_CONF_POWER_OFF:
		if (!cg)
			return SR_ERR_CHANNEL_GROUP;
		ret = bl_acme_set_power_off(cg, g_variant_get_boolean(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)
{
	uint32_t devopts_cg[MAX_DEVOPTS_CG];
	GVariant *gvar;
	GVariantBuilder gvb;
	int ret, num_devopts_cg = 0;

	(void)sdi;
	(void)cg;

	ret = SR_OK;
	if (!cg) {
		switch (key) {
		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;
		}
	} else {
		switch (key) {
		case SR_CONF_DEVICE_OPTIONS:
			if (bl_acme_get_probe_type(cg) == PROBE_ENRG)
				devopts_cg[num_devopts_cg++] = HAS_PROBE_FACTOR;
			if (bl_acme_probe_has_pws(cg))
				devopts_cg[num_devopts_cg++] = HAS_POWER_OFF;

			*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
				devopts_cg, num_devopts_cg, sizeof(uint32_t));
			break;
		default:
			return SR_ERR_NA;
		}
	}

	return ret;
}

static void dev_acquisition_close(const struct sr_dev_inst *sdi)
{
	GSList *chl;
	struct sr_channel *ch;

	for (chl = sdi->channels; chl; chl = chl->next) {
		ch = chl->data;
		bl_acme_close_channel(ch);
	}
}

static int dev_acquisition_open(const struct sr_dev_inst *sdi)
{
	GSList *chl;
	struct sr_channel *ch;

	for (chl = sdi->channels; chl; chl = chl->next) {
		ch = chl->data;
		if (bl_acme_open_channel(ch)) {
			sr_err("Error opening channel %s", ch->name);
			dev_acquisition_close(sdi);
			return SR_ERR;
		}
	}

	return 0;
}

static int dev_acquisition_start(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct itimerspec tspec = {
		.it_interval = { 0, 0 },
		.it_value = { 0, 0 }
	};

	if (dev_acquisition_open(sdi))
		return SR_ERR;

	devc = sdi->priv;
	devc->samples_missed = 0;
	devc->timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
	if (devc->timer_fd < 0) {
		sr_err("Error creating timer fd");
		return SR_ERR;
	}

	tspec.it_interval.tv_sec = 0;
	tspec.it_interval.tv_nsec = SR_HZ_TO_NS(devc->samplerate);
	tspec.it_value = tspec.it_interval;

	if (timerfd_settime(devc->timer_fd, 0, &tspec, NULL)) {
		sr_err("Failed to set timer");
		close(devc->timer_fd);
		return SR_ERR;
	}

	devc->channel = g_io_channel_unix_new(devc->timer_fd);
	g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL);
	g_io_channel_set_encoding(devc->channel, NULL, NULL);
	g_io_channel_set_buffered(devc->channel, FALSE);

	sr_session_source_add_channel(sdi->session, devc->channel,
		G_IO_IN | G_IO_ERR, 1000, bl_acme_receive_data, (void *)sdi);

	std_session_send_df_header(sdi);
	sr_sw_limits_acquisition_start(&devc->limits);

	return SR_OK;
}

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

	devc = sdi->priv;

	dev_acquisition_close(sdi);
	sr_session_source_remove_channel(sdi->session, devc->channel);
	g_io_channel_shutdown(devc->channel, FALSE, NULL);
	g_io_channel_unref(devc->channel);
	devc->channel = NULL;

	std_session_send_df_end(sdi);

	if (devc->samples_missed > 0)
		sr_warn("%" PRIu64 " samples missed", devc->samples_missed);

	return SR_OK;
}

static struct sr_dev_driver baylibre_acme_driver_info = {
	.name = "baylibre-acme",
	.longname = "BayLibre ACME (Another Cute Measurement Equipment)",
	.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(baylibre_acme_driver_info);
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2015 Bartosz Golaszewski <bgolaszewski@baylibre.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 "protocol.h"
	22	#include <time.h>
	23	#include <sys/timerfd.h>
	24
	25	static const uint32_t devopts[] = {
	26	SR_CONF_CONTINUOUS,
	27	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
	28	SR_CONF_LIMIT_MSEC \| SR_CONF_GET \| SR_CONF_SET,
	29	SR_CONF_SAMPLERATE \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
	30	};
	31
	32	/*
	33	* Currently there are two channel-group/probe options for ACME:
	34	* - SR_CONF_PROBE_FACTOR - allows to modify current shunt resistance
	35	* calibration
	36	* - SR_CONF_POWER_OFF - allows to remotely cut-off/restore power to
	37	* measured devices
	38	*
	39	* They are not static - we have to check each probe's capabilities in
	40	* config_list().
	41	*/
	42	#define MAX_DEVOPTS_CG 2
	43	#define HAS_PROBE_FACTOR (SR_CONF_PROBE_FACTOR \| SR_CONF_GET \| SR_CONF_SET)
	44	#define HAS_POWER_OFF (SR_CONF_POWER_OFF \| SR_CONF_GET \| SR_CONF_SET)
	45
	46	#define MAX_SAMPLE_RATE 500 /* In Hz */
	47
	48	static const uint64_t samplerates[] = {
	49	SR_HZ(1),
	50	SR_HZ(MAX_SAMPLE_RATE),
	51	SR_HZ(1),
	52	};
	53
	54	static GSList scan(struct sr_dev_driver di, GSList *options)
	55	{
	56	struct dev_context *devc;
	57	struct sr_dev_inst *sdi;
	58	gboolean status;
	59	int i;
	60
	61	(void)options;
	62
	63	devc = g_malloc0(sizeof(struct dev_context));
	64	devc->samplerate = SR_HZ(10);
	65
	66	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	67	sdi->status = SR_ST_INACTIVE;
	68	sdi->vendor = g_strdup("BayLibre");
	69	sdi->model = g_strdup("ACME");
	70	sdi->priv = devc;
	71
	72	status = bl_acme_is_sane();
	73	if (!status)
	74	goto err_out;
	75
	76	/*
	77	* Iterate over all ACME connectors and check if any probes
	78	* are present.
	79	*/
	80	for (i = 0; i < MAX_PROBES; i++) {
	81	/*
	82	* First check if there's an energy probe on this connector. If
	83	* not, and we're already at the fifth probe - see if we can
	84	* detect a temperature probe.
	85	*/
	86	status = bl_acme_detect_probe(bl_acme_get_enrg_addr(i),
	87	PROBE_NUM(i), ENRG_PROBE_NAME);
	88	if (status) {
	89	/* Energy probe detected. */
	90	status = bl_acme_register_probe(sdi, PROBE_ENRG,
	91	bl_acme_get_enrg_addr(i), PROBE_NUM(i));
	92	if (!status) {
	93	sr_err("Error registering power probe %d",
	94	PROBE_NUM(i));
	95	continue;
	96	}
	97	} else if (i >= TEMP_PRB_START_INDEX) {
	98	status = bl_acme_detect_probe(bl_acme_get_temp_addr(i),
	99	PROBE_NUM(i), TEMP_PROBE_NAME);
	100	if (status) {
	101	/* Temperature probe detected. */
	102	status = bl_acme_register_probe(sdi,PROBE_TEMP,
	103	bl_acme_get_temp_addr(i), PROBE_NUM(i));
	104	if (!status) {
	105	sr_err("Error registering temp "
	106	"probe %d", PROBE_NUM(i));
	107	continue;
	108	}
	109	}
	110	}
	111	}
	112
	113	/*
	114	* Let's assume there's no ACME device present if no probe
	115	* has been registered.
	116	*/
	117	if (!sdi->channel_groups)
	118	goto err_out;
	119
	120	return std_scan_complete(di, g_slist_append(NULL, sdi));
	121
	122	err_out:
	123	g_free(devc);
	124	sr_dev_inst_free(sdi);
	125
	126	return NULL;
	127	}
	128
	129	static int dev_open(struct sr_dev_inst *sdi)
	130	{
	131	(void)sdi;
	132
	133	return SR_OK;
	134	}
	135
	136	static int dev_close(struct sr_dev_inst *sdi)
	137	{
	138	(void)sdi;
	139
	140	return SR_OK;
	141	}
	142
	143	static int config_get(uint32_t key, GVariant **data,
	144	const struct sr_dev_inst *sdi,
	145	const struct sr_channel_group *cg)
	146	{
	147	struct dev_context *devc;
	148	int ret;
	149	uint64_t shunt;
	150	gboolean power_off;
	151
	152	devc = sdi->priv;
	153
	154	ret = SR_OK;
	155	switch (key) {
	156	case SR_CONF_LIMIT_SAMPLES:
	157	case SR_CONF_LIMIT_MSEC:
	158	ret = sr_sw_limits_config_get(&devc->limits, key, data);
	159	break;
	160	case SR_CONF_SAMPLERATE:
	161	*data = g_variant_new_uint64(devc->samplerate);
	162	break;
	163	case SR_CONF_PROBE_FACTOR:
	164	if (!cg)
	165	return SR_ERR_CHANNEL_GROUP;
	166	ret = bl_acme_get_shunt(cg, &shunt);
	167	if (ret == SR_OK)
	168	*data = g_variant_new_uint64(shunt);
	169	break;
	170	case SR_CONF_POWER_OFF:
	171	if (!cg)
	172	return SR_ERR_CHANNEL_GROUP;
	173	ret = bl_acme_read_power_state(cg, &power_off);
	174	if (ret == SR_OK)
	175	*data = g_variant_new_boolean(power_off);
	176	break;
	177	default:
	178	return SR_ERR_NA;
	179	}
	180
	181	return ret;
	182	}
	183
	184	static int config_set(uint32_t key, GVariant *data,
	185	const struct sr_dev_inst *sdi,
	186	const struct sr_channel_group *cg)
	187	{
	188	struct dev_context *devc;
	189	uint64_t samplerate;
	190	int ret;
	191
	192	devc = sdi->priv;
	193
	194	ret = SR_OK;
	195	switch (key) {
	196	case SR_CONF_LIMIT_SAMPLES:
	197	case SR_CONF_LIMIT_MSEC:
	198	ret = sr_sw_limits_config_set(&devc->limits, key, data);
	199	break;
	200	case SR_CONF_SAMPLERATE:
	201	samplerate = g_variant_get_uint64(data);
	202	if (samplerate > MAX_SAMPLE_RATE) {
	203	sr_err("Maximum sample rate is %d", MAX_SAMPLE_RATE);
	204	ret = SR_ERR_SAMPLERATE;
	205	break;
	206	}
	207	devc->samplerate = samplerate;
	208	bl_acme_maybe_set_update_interval(sdi, samplerate);
	209	break;
	210	case SR_CONF_PROBE_FACTOR:
	211	if (!cg)
	212	return SR_ERR_CHANNEL_GROUP;
	213	ret = bl_acme_set_shunt(cg, g_variant_get_uint64(data));
	214	break;
	215	case SR_CONF_POWER_OFF:
	216	if (!cg)
	217	return SR_ERR_CHANNEL_GROUP;
	218	ret = bl_acme_set_power_off(cg, g_variant_get_boolean(data));
	219	break;
	220	default:
	221	ret = SR_ERR_NA;
	222	}
	223
	224	return ret;
	225	}
	226
	227	static int config_list(uint32_t key, GVariant **data,
	228	const struct sr_dev_inst *sdi,
	229	const struct sr_channel_group *cg)
	230	{
	231	uint32_t devopts_cg[MAX_DEVOPTS_CG];
	232	GVariant *gvar;
	233	GVariantBuilder gvb;
	234	int ret, num_devopts_cg = 0;
	235
	236	(void)sdi;
	237	(void)cg;
	238
	239	ret = SR_OK;
	240	if (!cg) {
	241	switch (key) {
	242	case SR_CONF_DEVICE_OPTIONS:
	243	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	244	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
	245	break;
	246	case SR_CONF_SAMPLERATE:
	247	g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
	248	gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
	249	samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
	250	g_variant_builder_add(&gvb, "{sv}",
	251	"samplerate-steps", gvar);
	252	*data = g_variant_builder_end(&gvb);
	253	break;
	254	default:
	255	return SR_ERR_NA;
	256	}
	257	} else {
	258	switch (key) {
	259	case SR_CONF_DEVICE_OPTIONS:
	260	if (bl_acme_get_probe_type(cg) == PROBE_ENRG)
	261	devopts_cg[num_devopts_cg++] = HAS_PROBE_FACTOR;
	262	if (bl_acme_probe_has_pws(cg))
	263	devopts_cg[num_devopts_cg++] = HAS_POWER_OFF;
	264
	265	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	266	devopts_cg, num_devopts_cg, sizeof(uint32_t));
	267	break;
	268	default:
	269	return SR_ERR_NA;
	270	}
	271	}
	272
	273	return ret;
	274	}
	275
	276	static void dev_acquisition_close(const struct sr_dev_inst *sdi)
	277	{
	278	GSList *chl;
	279	struct sr_channel *ch;
	280
	281	for (chl = sdi->channels; chl; chl = chl->next) {
	282	ch = chl->data;
	283	bl_acme_close_channel(ch);
	284	}
	285	}
	286
	287	static int dev_acquisition_open(const struct sr_dev_inst *sdi)
	288	{
	289	GSList *chl;
	290	struct sr_channel *ch;
	291
	292	for (chl = sdi->channels; chl; chl = chl->next) {
	293	ch = chl->data;
	294	if (bl_acme_open_channel(ch)) {
	295	sr_err("Error opening channel %s", ch->name);
	296	dev_acquisition_close(sdi);
	297	return SR_ERR;
	298	}
	299	}
	300
	301	return 0;
	302	}
	303
	304	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	305	{
	306	struct dev_context *devc;
	307	struct itimerspec tspec = {
	308	.it_interval = { 0, 0 },
	309	.it_value = { 0, 0 }
	310	};
	311
	312	if (dev_acquisition_open(sdi))
	313	return SR_ERR;
	314
	315	devc = sdi->priv;
	316	devc->samples_missed = 0;
	317	devc->timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
	318	if (devc->timer_fd < 0) {
	319	sr_err("Error creating timer fd");
	320	return SR_ERR;
	321	}
	322
	323	tspec.it_interval.tv_sec = 0;
	324	tspec.it_interval.tv_nsec = SR_HZ_TO_NS(devc->samplerate);
	325	tspec.it_value = tspec.it_interval;
	326
	327	if (timerfd_settime(devc->timer_fd, 0, &tspec, NULL)) {
	328	sr_err("Failed to set timer");
	329	close(devc->timer_fd);
	330	return SR_ERR;
	331	}
	332
	333	devc->channel = g_io_channel_unix_new(devc->timer_fd);
	334	g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL);
	335	g_io_channel_set_encoding(devc->channel, NULL, NULL);
	336	g_io_channel_set_buffered(devc->channel, FALSE);
	337
	338	sr_session_source_add_channel(sdi->session, devc->channel,
	339	G_IO_IN \| G_IO_ERR, 1000, bl_acme_receive_data, (void *)sdi);
	340
	341	std_session_send_df_header(sdi);
	342	sr_sw_limits_acquisition_start(&devc->limits);
	343
	344	return SR_OK;
	345	}
	346
	347	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	348	{
	349	struct dev_context *devc;
	350
	351	devc = sdi->priv;
	352
	353	dev_acquisition_close(sdi);
	354	sr_session_source_remove_channel(sdi->session, devc->channel);
	355	g_io_channel_shutdown(devc->channel, FALSE, NULL);
	356	g_io_channel_unref(devc->channel);
	357	devc->channel = NULL;
	358
	359	std_session_send_df_end(sdi);
	360
	361	if (devc->samples_missed > 0)
	362	sr_warn("%" PRIu64 " samples missed", devc->samples_missed);
	363
	364	return SR_OK;
	365	}
	366
	367	static struct sr_dev_driver baylibre_acme_driver_info = {
	368	.name = "baylibre-acme",
	369	.longname = "BayLibre ACME (Another Cute Measurement Equipment)",
	370	.api_version = 1,
	371	.init = std_init,
	372	.cleanup = std_cleanup,
	373	.scan = scan,
	374	.dev_list = std_dev_list,
	375	.config_get = config_get,
	376	.config_set = config_set,
	377	.config_list = config_list,
	378	.dev_open = dev_open,
	379	.dev_close = dev_close,
	380	.dev_acquisition_start = dev_acquisition_start,
	381	.dev_acquisition_stop = dev_acquisition_stop,
	382	.context = NULL,
	383	};
	384	SR_REGISTER_DEV_DRIVER(baylibre_acme_driver_info);