[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>

SR_PRIV struct sr_dev_driver baylibre_acme_driver_info;

static const uint32_t devopts[] = {
	SR_CONF_CONTINUOUS | SR_CONF_SET,
	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 int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
{
	return std_init(sr_ctx, di, LOG_PREFIX);
}

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

	(void)options;

	drvc = di->context;
	devices = NULL;

	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->driver = di;
	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;

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

	return devices;

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

	return NULL;
}

static GSList *dev_list(const struct sr_dev_driver *di)
{
	return ((struct drv_context *)(di->context))->instances;
}

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

	sdi->status = SR_ST_ACTIVE;

	return SR_OK;
}

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

	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;
	int ret;
	uint64_t shunt;
	gboolean power_off;

	devc = sdi->priv;

	ret = SR_OK;
	switch (key) {
	case SR_CONF_LIMIT_SAMPLES:
		*data = g_variant_new_uint64(devc->limit_samples);
		break;
	case SR_CONF_LIMIT_MSEC:
		*data = g_variant_new_uint64(devc->limit_msec);
		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;

	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);
		devc->limit_msec = 0;
		break;
	case SR_CONF_LIMIT_MSEC:
		devc->limit_msec = g_variant_get_uint64(data) * 1000;
		devc->limit_samples = 0;
		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 (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

	if (dev_acquisition_open(sdi))
		return SR_ERR;

	devc = sdi->priv;
	devc->samples_read = 0;
	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, LOG_PREFIX);
	devc->start_time = g_get_monotonic_time();

	return SR_OK;
}

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

	devc = sdi->priv;

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

	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, LOG_PREFIX);

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

	return SR_OK;
}

SR_PRIV struct sr_dev_driver baylibre_acme_driver_info = {
	.name = "baylibre-acme",
	.longname = "BayLibre ACME (Another Cute Measurement Equipment)",
	.api_version = 1,
	.init = init,
	.cleanup = std_cleanup,
	.scan = scan,
	.dev_list = 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,
};
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	SR_PRIV struct sr_dev_driver baylibre_acme_driver_info;
	26
	27	static const uint32_t devopts[] = {
	28	SR_CONF_CONTINUOUS \| SR_CONF_SET,
	29	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
	30	SR_CONF_LIMIT_MSEC \| SR_CONF_GET \| SR_CONF_SET,
	31	SR_CONF_SAMPLERATE \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
	32	};
	33
	34	/*
	35	* Currently there are two channel-group/probe options for ACME:
	36	* - SR_CONF_PROBE_FACTOR - allows to modify current shunt resistance
	37	* calibration
	38	* - SR_CONF_POWER_OFF - allows to remotely cut-off/restore power to
	39	* measured devices
	40	*
	41	* They are not static - we have to check each probe's capabilities in
	42	* config_list().
	43	*/
	44	#define MAX_DEVOPTS_CG 2
	45	#define HAS_PROBE_FACTOR (SR_CONF_PROBE_FACTOR \| SR_CONF_GET \| SR_CONF_SET)
	46	#define HAS_POWER_OFF (SR_CONF_POWER_OFF \| SR_CONF_GET \| SR_CONF_SET)
	47
	48	#define MAX_SAMPLE_RATE 500 /* In Hz */
	49
	50	static const uint64_t samplerates[] = {
	51	SR_HZ(1),
	52	SR_HZ(MAX_SAMPLE_RATE),
	53	SR_HZ(1),
	54	};
	55
	56	static int init(struct sr_dev_driver di, struct sr_context sr_ctx)
	57	{
	58	return std_init(sr_ctx, di, LOG_PREFIX);
	59	}
	60
	61	static GSList scan(struct sr_dev_driver di, GSList *options)
	62	{
	63	struct drv_context *drvc;
	64	struct dev_context *devc;
	65	struct sr_dev_inst *sdi;
	66	GSList *devices;
	67	gboolean status;
	68	int i;
	69
	70	(void)options;
	71
	72	drvc = di->context;
	73	devices = NULL;
	74
	75	devc = g_malloc0(sizeof(struct dev_context));
	76	devc->samplerate = SR_HZ(10);
	77
	78	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	79	sdi->status = SR_ST_INACTIVE;
	80	sdi->vendor = g_strdup("BayLibre");
	81	sdi->model = g_strdup("ACME");
	82	sdi->driver = di;
	83	sdi->priv = devc;
	84
	85	status = bl_acme_is_sane();
	86	if (!status)
	87	goto err_out;
	88
	89	/*
	90	* Iterate over all ACME connectors and check if any probes
	91	* are present.
	92	*/
	93	for (i = 0; i < MAX_PROBES; i++) {
	94	/*
	95	* First check if there's an energy probe on this connector. If
	96	* not, and we're already at the fifth probe - see if we can
	97	* detect a temperature probe.
	98	*/
	99	status = bl_acme_detect_probe(bl_acme_get_enrg_addr(i),
	100	PROBE_NUM(i), ENRG_PROBE_NAME);
	101	if (status) {
	102	/* Energy probe detected. */
	103	status = bl_acme_register_probe(sdi, PROBE_ENRG,
	104	bl_acme_get_enrg_addr(i), PROBE_NUM(i));
	105	if (!status) {
	106	sr_err("Error registering power probe %d",
	107	PROBE_NUM(i));
	108	continue;
	109	}
	110	} else if (i >= TEMP_PRB_START_INDEX) {
	111	status = bl_acme_detect_probe(bl_acme_get_temp_addr(i),
	112	PROBE_NUM(i), TEMP_PROBE_NAME);
	113	if (status) {
	114	/* Temperature probe detected. */
	115	status = bl_acme_register_probe(sdi,PROBE_TEMP,
	116	bl_acme_get_temp_addr(i), PROBE_NUM(i));
	117	if (!status) {
	118	sr_err("Error registering temp "
	119	"probe %d", PROBE_NUM(i));
	120	continue;
	121	}
	122	}
	123	}
	124	}
	125
	126	/*
	127	* Let's assume there's no ACME device present if no probe
	128	* has been registered.
	129	*/
	130	if (!sdi->channel_groups)
	131	goto err_out;
	132
	133	devices = g_slist_append(devices, sdi);
	134	drvc->instances = g_slist_append(drvc->instances, sdi);
	135
	136	return devices;
	137
	138	err_out:
	139	g_free(devc);
	140	sr_dev_inst_free(sdi);
	141
	142	return NULL;
	143	}
	144
	145	static GSList dev_list(const struct sr_dev_driver di)
	146	{
	147	return ((struct drv_context *)(di->context))->instances;
	148	}
	149
	150	static int dev_open(struct sr_dev_inst *sdi)
	151	{
	152	(void)sdi;
	153
	154	sdi->status = SR_ST_ACTIVE;
	155
	156	return SR_OK;
	157	}
	158
	159	static int dev_close(struct sr_dev_inst *sdi)
	160	{
	161	(void)sdi;
	162
	163	sdi->status = SR_ST_INACTIVE;
	164
	165	return SR_OK;
	166	}
	167
	168	static int config_get(uint32_t key, GVariant **data,
	169	const struct sr_dev_inst *sdi,
	170	const struct sr_channel_group *cg)
	171	{
	172	struct dev_context *devc;
	173	int ret;
	174	uint64_t shunt;
	175	gboolean power_off;
	176
	177	devc = sdi->priv;
	178
	179	ret = SR_OK;
	180	switch (key) {
	181	case SR_CONF_LIMIT_SAMPLES:
	182	*data = g_variant_new_uint64(devc->limit_samples);
	183	break;
	184	case SR_CONF_LIMIT_MSEC:
	185	*data = g_variant_new_uint64(devc->limit_msec);
	186	break;
	187	case SR_CONF_SAMPLERATE:
	188	*data = g_variant_new_uint64(devc->samplerate);
	189	break;
	190	case SR_CONF_PROBE_FACTOR:
	191	if (!cg)
	192	return SR_ERR_CHANNEL_GROUP;
	193	ret = bl_acme_get_shunt(cg, &shunt);
	194	if (ret == SR_OK)
	195	*data = g_variant_new_uint64(shunt);
	196	break;
	197	case SR_CONF_POWER_OFF:
	198	if (!cg)
	199	return SR_ERR_CHANNEL_GROUP;
	200	ret = bl_acme_read_power_state(cg, &power_off);
	201	if (ret == SR_OK)
	202	*data = g_variant_new_boolean(power_off);
	203	break;
	204	default:
	205	return SR_ERR_NA;
	206	}
	207
	208	return ret;
	209	}
	210
	211	static int config_set(uint32_t key, GVariant *data,
	212	const struct sr_dev_inst *sdi,
	213	const struct sr_channel_group *cg)
	214	{
	215	struct dev_context *devc;
	216	uint64_t samplerate;
	217	int ret;
	218
	219	if (sdi->status != SR_ST_ACTIVE)
	220	return SR_ERR_DEV_CLOSED;
	221
	222	devc = sdi->priv;
	223
	224	ret = SR_OK;
	225	switch (key) {
	226	case SR_CONF_LIMIT_SAMPLES:
	227	devc->limit_samples = g_variant_get_uint64(data);
	228	devc->limit_msec = 0;
	229	break;
	230	case SR_CONF_LIMIT_MSEC:
	231	devc->limit_msec = g_variant_get_uint64(data) * 1000;
	232	devc->limit_samples = 0;
	233	break;
	234	case SR_CONF_SAMPLERATE:
	235	samplerate = g_variant_get_uint64(data);
	236	if (samplerate > MAX_SAMPLE_RATE) {
	237	sr_err("Maximum sample rate is %d", MAX_SAMPLE_RATE);
	238	ret = SR_ERR_SAMPLERATE;
	239	break;
	240	}
	241	devc->samplerate = samplerate;
	242	bl_acme_maybe_set_update_interval(sdi, samplerate);
	243	break;
	244	case SR_CONF_PROBE_FACTOR:
	245	if (!cg)
	246	return SR_ERR_CHANNEL_GROUP;
	247	ret = bl_acme_set_shunt(cg, g_variant_get_uint64(data));
	248	break;
	249	case SR_CONF_POWER_OFF:
	250	if (!cg)
	251	return SR_ERR_CHANNEL_GROUP;
	252	ret = bl_acme_set_power_off(cg, g_variant_get_boolean(data));
	253	break;
	254	default:
	255	ret = SR_ERR_NA;
	256	}
	257
	258	return ret;
	259	}
	260
	261	static int config_list(uint32_t key, GVariant **data,
	262	const struct sr_dev_inst *sdi,
	263	const struct sr_channel_group *cg)
	264	{
	265	uint32_t devopts_cg[MAX_DEVOPTS_CG];
	266	GVariant *gvar;
	267	GVariantBuilder gvb;
	268	int ret, num_devopts_cg = 0;
	269
	270	(void)sdi;
	271	(void)cg;
	272
	273	ret = SR_OK;
	274	if (!cg) {
	275	switch (key) {
	276	case SR_CONF_DEVICE_OPTIONS:
	277	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	278	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
	279	break;
	280	case SR_CONF_SAMPLERATE:
	281	g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
	282	gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
	283	samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
	284	g_variant_builder_add(&gvb, "{sv}",
	285	"samplerate-steps", gvar);
	286	*data = g_variant_builder_end(&gvb);
	287	break;
	288	default:
	289	return SR_ERR_NA;
	290	}
	291	} else {
	292	switch (key) {
	293	case SR_CONF_DEVICE_OPTIONS:
	294	if (bl_acme_get_probe_type(cg) == PROBE_ENRG)
	295	devopts_cg[num_devopts_cg++] = HAS_PROBE_FACTOR;
	296	if (bl_acme_probe_has_pws(cg))
	297	devopts_cg[num_devopts_cg++] = HAS_POWER_OFF;
	298
	299	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	300	devopts_cg, num_devopts_cg, sizeof(uint32_t));
	301	break;
	302	default:
	303	return SR_ERR_NA;
	304	}
	305	}
	306
	307	return ret;
	308	}
	309
	310	static void dev_acquisition_close(const struct sr_dev_inst *sdi)
	311	{
	312	GSList *chl;
	313	struct sr_channel *ch;
	314
	315	for (chl = sdi->channels; chl; chl = chl->next) {
	316	ch = chl->data;
	317	bl_acme_close_channel(ch);
	318	}
	319	}
	320
	321	static int dev_acquisition_open(const struct sr_dev_inst *sdi)
	322	{
	323	GSList *chl;
	324	struct sr_channel *ch;
	325
	326	for (chl = sdi->channels; chl; chl = chl->next) {
	327	ch = chl->data;
	328	if (bl_acme_open_channel(ch)) {
	329	sr_err("Error opening channel %s", ch->name);
	330	dev_acquisition_close(sdi);
	331	return SR_ERR;
	332	}
	333	}
	334
	335	return 0;
	336	}
	337
	338	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	339	{
	340	struct dev_context *devc;
	341	struct itimerspec tspec = {
	342	.it_interval = { 0, 0 },
	343	.it_value = { 0, 0 }
	344	};
	345
	346	if (sdi->status != SR_ST_ACTIVE)
	347	return SR_ERR_DEV_CLOSED;
	348
	349	if (dev_acquisition_open(sdi))
	350	return SR_ERR;
	351
	352	devc = sdi->priv;
	353	devc->samples_read = 0;
	354	devc->samples_missed = 0;
	355	devc->timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
	356	if (devc->timer_fd < 0) {
	357	sr_err("Error creating timer fd");
	358	return SR_ERR;
	359	}
	360
	361	tspec.it_interval.tv_sec = 0;
	362	tspec.it_interval.tv_nsec = SR_HZ_TO_NS(devc->samplerate);
	363	tspec.it_value = tspec.it_interval;
	364
	365	if (timerfd_settime(devc->timer_fd, 0, &tspec, NULL)) {
	366	sr_err("Failed to set timer");
	367	close(devc->timer_fd);
	368	return SR_ERR;
	369	}
	370
	371	devc->channel = g_io_channel_unix_new(devc->timer_fd);
	372	g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL);
	373	g_io_channel_set_encoding(devc->channel, NULL, NULL);
	374	g_io_channel_set_buffered(devc->channel, FALSE);
	375
	376	sr_session_source_add_channel(sdi->session, devc->channel,
	377	G_IO_IN \| G_IO_ERR, 1000, bl_acme_receive_data, (void *)sdi);
	378
	379	std_session_send_df_header(sdi, LOG_PREFIX);
	380	devc->start_time = g_get_monotonic_time();
	381
	382	return SR_OK;
	383	}
	384
	385	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	386	{
	387	struct dev_context *devc;
	388
	389	devc = sdi->priv;
	390
	391	if (sdi->status != SR_ST_ACTIVE)
	392	return SR_ERR_DEV_CLOSED;
	393
	394	dev_acquisition_close(sdi);
	395	sr_session_source_remove_channel(sdi->session, devc->channel);
	396	g_io_channel_shutdown(devc->channel, FALSE, NULL);
	397	g_io_channel_unref(devc->channel);
	398	devc->channel = NULL;
	399
	400	std_session_send_df_end(sdi, LOG_PREFIX);
	401
	402	if (devc->samples_missed > 0)
	403	sr_warn("%" PRIu64 " samples missed", devc->samples_missed);
	404
	405	return SR_OK;
	406	}
	407
	408	SR_PRIV struct sr_dev_driver baylibre_acme_driver_info = {
	409	.name = "baylibre-acme",
	410	.longname = "BayLibre ACME (Another Cute Measurement Equipment)",
	411	.api_version = 1,
	412	.init = init,
	413	.cleanup = std_cleanup,
	414	.scan = scan,
	415	.dev_list = dev_list,
	416	.config_get = config_get,
	417	.config_set = config_set,
	418	.config_list = config_list,
	419	.dev_open = dev_open,
	420	.dev_close = dev_close,
	421	.dev_acquisition_start = dev_acquisition_start,
	422	.dev_acquisition_stop = dev_acquisition_stop,
	423	.context = NULL,
	424	};