[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 "protocol.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->priv;
	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->priv))->instances;
}

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

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

	/* Nothing to do here. */
	sdi->status = SR_ST_ACTIVE;

	return SR_OK;
}

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

	/* Nothing to do here. */
	sdi->status = SR_ST_INACTIVE;

	return SR_OK;
}

static int cleanup(const struct sr_dev_driver *di)
{
	dev_clear(di);

	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 int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
{
	struct dev_context *devc;

	(void)cb_data;

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

	devc = sdi->priv;
	devc->samples_read = 0;

	if (pipe(devc->pipe_fds)) {
		sr_err("Error setting up pipe");
		return SR_ERR;
	}

	devc->channel = g_io_channel_unix_new(devc->pipe_fds[0]);
	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, 1, bl_acme_receive_data, (void *)sdi);

	/* Send header packet to the session bus. */
	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, void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct dev_context *devc;

	(void)cb_data;

	devc = sdi->priv;

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

	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;

	/* Send last packet. */
	packet.type = SR_DF_END;
	sr_session_send(sdi, &packet);

	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 = cleanup,
	.scan = scan,
	.dev_list = 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,
	.priv = 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 "protocol.h"
	21
	22	SR_PRIV struct sr_dev_driver baylibre_acme_driver_info;
	23
	24	static const uint32_t devopts[] = {
	25	SR_CONF_CONTINUOUS \| SR_CONF_SET,
	26	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
	27	SR_CONF_LIMIT_MSEC \| SR_CONF_GET \| SR_CONF_SET,
	28	SR_CONF_SAMPLERATE \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
	29	};
	30
	31	/*
	32	* Currently there are two channel-group/probe options for ACME:
	33	* - SR_CONF_PROBE_FACTOR - allows to modify current shunt resistance
	34	* calibration
	35	* - SR_CONF_POWER_OFF - allows to remotely cut-off/restore power to
	36	* measured devices
	37	*
	38	* They are not static - we have to check each probe's capabilities in
	39	* config_list().
	40	*/
	41	#define MAX_DEVOPTS_CG 2
	42	#define HAS_PROBE_FACTOR (SR_CONF_PROBE_FACTOR \| SR_CONF_GET \| SR_CONF_SET)
	43	#define HAS_POWER_OFF (SR_CONF_POWER_OFF \| SR_CONF_GET \| SR_CONF_SET)
	44
	45	#define MAX_SAMPLE_RATE 500 /* In Hz */
	46
	47	static const uint64_t samplerates[] = {
	48	SR_HZ(1),
	49	SR_HZ(MAX_SAMPLE_RATE),
	50	SR_HZ(1),
	51	};
	52
	53	static int init(struct sr_dev_driver di, struct sr_context sr_ctx)
	54	{
	55	return std_init(sr_ctx, di, LOG_PREFIX);
	56	}
	57
	58	static GSList scan(struct sr_dev_driver di, GSList *options)
	59	{
	60	struct drv_context *drvc;
	61	struct dev_context *devc;
	62	struct sr_dev_inst *sdi;
	63	GSList *devices;
	64	gboolean status;
	65	int i;
	66
	67	(void)options;
	68
	69	drvc = di->priv;
	70	devices = NULL;
	71
	72	devc = g_malloc0(sizeof(struct dev_context));
	73	devc->samplerate = SR_HZ(10);
	74
	75	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	76	sdi->status = SR_ST_INACTIVE;
	77	sdi->vendor = g_strdup("BayLibre");
	78	sdi->model = g_strdup("ACME");
	79	sdi->driver = di;
	80	sdi->priv = devc;
	81
	82	status = bl_acme_is_sane();
	83	if (!status)
	84	goto err_out;
	85
	86	/*
	87	* Iterate over all ACME connectors and check if any probes
	88	* are present.
	89	*/
	90	for (i = 0; i < MAX_PROBES; i++) {
	91	/*
	92	* First check if there's an energy probe on this connector. If
	93	* not, and we're already at the fifth probe - see if we can
	94	* detect a temperature probe.
	95	*/
	96	status = bl_acme_detect_probe(bl_acme_get_enrg_addr(i),
	97	PROBE_NUM(i), ENRG_PROBE_NAME);
	98	if (status) {
	99	/* Energy probe detected. */
	100	status = bl_acme_register_probe(sdi, PROBE_ENRG,
	101	bl_acme_get_enrg_addr(i), PROBE_NUM(i));
	102	if (!status) {
	103	sr_err("Error registering power probe %d",
	104	PROBE_NUM(i));
	105	continue;
	106	}
	107	} else if (i >= TEMP_PRB_START_INDEX) {
	108	status = bl_acme_detect_probe(bl_acme_get_temp_addr(i),
	109	PROBE_NUM(i), TEMP_PROBE_NAME);
	110	if (status) {
	111	/* Temperature probe detected. */
	112	status = bl_acme_register_probe(sdi,PROBE_TEMP,
	113	bl_acme_get_temp_addr(i), PROBE_NUM(i));
	114	if (!status) {
	115	sr_err("Error registering temp "
	116	"probe %d", PROBE_NUM(i));
	117	continue;
	118	}
	119	}
	120	}
	121	}
	122
	123	/*
	124	* Let's assume there's no ACME device present if no probe
	125	* has been registered.
	126	*/
	127	if (!sdi->channel_groups)
	128	goto err_out;
	129
	130	devices = g_slist_append(devices, sdi);
	131	drvc->instances = g_slist_append(drvc->instances, sdi);
	132
	133	return devices;
	134
	135	err_out:
	136	g_free(devc);
	137	sr_dev_inst_free(sdi);
	138
	139	return NULL;
	140	}
	141
	142	static GSList dev_list(const struct sr_dev_driver di)
	143	{
	144	return ((struct drv_context *)(di->priv))->instances;
	145	}
	146
	147	static int dev_clear(const struct sr_dev_driver *di)
	148	{
	149	return std_dev_clear(di, NULL);
	150	}
	151
	152	static int dev_open(struct sr_dev_inst *sdi)
	153	{
	154	(void)sdi;
	155
	156	/* Nothing to do here. */
	157	sdi->status = SR_ST_ACTIVE;
	158
	159	return SR_OK;
	160	}
	161
	162	static int dev_close(struct sr_dev_inst *sdi)
	163	{
	164	(void)sdi;
	165
	166	/* Nothing to do here. */
	167	sdi->status = SR_ST_INACTIVE;
	168
	169	return SR_OK;
	170	}
	171
	172	static int cleanup(const struct sr_dev_driver *di)
	173	{
	174	dev_clear(di);
	175
	176	return SR_OK;
	177	}
	178
	179	static int config_get(uint32_t key, GVariant **data,
	180	const struct sr_dev_inst *sdi,
	181	const struct sr_channel_group *cg)
	182	{
	183	struct dev_context *devc;
	184	int ret;
	185	uint64_t shunt;
	186	gboolean power_off;
	187
	188	devc = sdi->priv;
	189
	190	ret = SR_OK;
	191	switch (key) {
	192	case SR_CONF_LIMIT_SAMPLES:
	193	*data = g_variant_new_uint64(devc->limit_samples);
	194	break;
	195	case SR_CONF_LIMIT_MSEC:
	196	*data = g_variant_new_uint64(devc->limit_msec);
	197	break;
	198	case SR_CONF_SAMPLERATE:
	199	*data = g_variant_new_uint64(devc->samplerate);
	200	break;
	201	case SR_CONF_PROBE_FACTOR:
	202	if (!cg)
	203	return SR_ERR_CHANNEL_GROUP;
	204	ret = bl_acme_get_shunt(cg, &shunt);
	205	if (ret == SR_OK)
	206	*data = g_variant_new_uint64(shunt);
	207	break;
	208	case SR_CONF_POWER_OFF:
	209	if (!cg)
	210	return SR_ERR_CHANNEL_GROUP;
	211	ret = bl_acme_read_power_state(cg, &power_off);
	212	if (ret == SR_OK)
	213	*data = g_variant_new_boolean(power_off);
	214	break;
	215	default:
	216	return SR_ERR_NA;
	217	}
	218
	219	return ret;
	220	}
	221
	222	static int config_set(uint32_t key, GVariant *data,
	223	const struct sr_dev_inst *sdi,
	224	const struct sr_channel_group *cg)
	225	{
	226	struct dev_context *devc;
	227	uint64_t samplerate;
	228	int ret;
	229
	230	if (sdi->status != SR_ST_ACTIVE)
	231	return SR_ERR_DEV_CLOSED;
	232
	233	devc = sdi->priv;
	234
	235	ret = SR_OK;
	236	switch (key) {
	237	case SR_CONF_LIMIT_SAMPLES:
	238	devc->limit_samples = g_variant_get_uint64(data);
	239	devc->limit_msec = 0;
	240	break;
	241	case SR_CONF_LIMIT_MSEC:
	242	devc->limit_msec = g_variant_get_uint64(data) * 1000;
	243	devc->limit_samples = 0;
	244	break;
	245	case SR_CONF_SAMPLERATE:
	246	samplerate = g_variant_get_uint64(data);
	247	if (samplerate > MAX_SAMPLE_RATE) {
	248	sr_err("Maximum sample rate is %d", MAX_SAMPLE_RATE);
	249	ret = SR_ERR_SAMPLERATE;
	250	break;
	251	}
	252	devc->samplerate = samplerate;
	253	bl_acme_maybe_set_update_interval(sdi, samplerate);
	254	break;
	255	case SR_CONF_PROBE_FACTOR:
	256	if (!cg)
	257	return SR_ERR_CHANNEL_GROUP;
	258	ret = bl_acme_set_shunt(cg, g_variant_get_uint64(data));
	259	break;
	260	case SR_CONF_POWER_OFF:
	261	if (!cg)
	262	return SR_ERR_CHANNEL_GROUP;
	263	ret = bl_acme_set_power_off(cg, g_variant_get_boolean(data));
	264	break;
	265	default:
	266	ret = SR_ERR_NA;
	267	}
	268
	269	return ret;
	270	}
	271
	272	static int config_list(uint32_t key, GVariant **data,
	273	const struct sr_dev_inst *sdi,
	274	const struct sr_channel_group *cg)
	275	{
	276	uint32_t devopts_cg[MAX_DEVOPTS_CG];
	277	GVariant *gvar;
	278	GVariantBuilder gvb;
	279	int ret, num_devopts_cg = 0;
	280
	281	(void)sdi;
	282	(void)cg;
	283
	284	ret = SR_OK;
	285	if (!cg) {
	286	switch (key) {
	287	case SR_CONF_DEVICE_OPTIONS:
	288	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	289	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
	290	break;
	291	case SR_CONF_SAMPLERATE:
	292	g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
	293	gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
	294	samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
	295	g_variant_builder_add(&gvb, "{sv}",
	296	"samplerate-steps", gvar);
	297	*data = g_variant_builder_end(&gvb);
	298	break;
	299	default:
	300	return SR_ERR_NA;
	301	}
	302	} else {
	303	switch (key) {
	304	case SR_CONF_DEVICE_OPTIONS:
	305	if (bl_acme_get_probe_type(cg) == PROBE_ENRG)
	306	devopts_cg[num_devopts_cg++] = HAS_PROBE_FACTOR;
	307	if (bl_acme_probe_has_pws(cg))
	308	devopts_cg[num_devopts_cg++] = HAS_POWER_OFF;
	309
	310	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	311	devopts_cg, num_devopts_cg, sizeof(uint32_t));
	312	break;
	313	default:
	314	return SR_ERR_NA;
	315	}
	316	}
	317
	318	return ret;
	319	}
	320
	321	static int dev_acquisition_start(const struct sr_dev_inst sdi, void cb_data)
	322	{
	323	struct dev_context *devc;
	324
	325	(void)cb_data;
	326
	327	if (sdi->status != SR_ST_ACTIVE)
	328	return SR_ERR_DEV_CLOSED;
	329
	330	devc = sdi->priv;
	331	devc->samples_read = 0;
	332
	333	if (pipe(devc->pipe_fds)) {
	334	sr_err("Error setting up pipe");
	335	return SR_ERR;
	336	}
	337
	338	devc->channel = g_io_channel_unix_new(devc->pipe_fds[0]);
	339	g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL);
	340	g_io_channel_set_encoding(devc->channel, NULL, NULL);
	341	g_io_channel_set_buffered(devc->channel, FALSE);
	342
	343	sr_session_source_add_channel(sdi->session, devc->channel,
	344	G_IO_IN \| G_IO_ERR, 1, bl_acme_receive_data, (void *)sdi);
	345
	346	/* Send header packet to the session bus. */
	347	std_session_send_df_header(sdi, LOG_PREFIX);
	348	devc->start_time = g_get_monotonic_time();
	349
	350	return SR_OK;
	351	}
	352
	353	static int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	354	{
	355	struct sr_datafeed_packet packet;
	356	struct dev_context *devc;
	357
	358	(void)cb_data;
	359
	360	devc = sdi->priv;
	361
	362	if (sdi->status != SR_ST_ACTIVE)
	363	return SR_ERR_DEV_CLOSED;
	364
	365	sr_session_source_remove_channel(sdi->session, devc->channel);
	366	g_io_channel_shutdown(devc->channel, FALSE, NULL);
	367	g_io_channel_unref(devc->channel);
	368	devc->channel = NULL;
	369
	370	/* Send last packet. */
	371	packet.type = SR_DF_END;
	372	sr_session_send(sdi, &packet);
	373
	374	return SR_OK;
	375	}
	376
	377	SR_PRIV struct sr_dev_driver baylibre_acme_driver_info = {
	378	.name = "baylibre-acme",
	379	.longname = "BayLibre ACME (Another Cute Measurement Equipment)",
	380	.api_version = 1,
	381	.init = init,
	382	.cleanup = cleanup,
	383	.scan = scan,
	384	.dev_list = dev_list,
	385	.dev_clear = dev_clear,
	386	.config_get = config_get,
	387	.config_set = config_set,
	388	.config_list = config_list,
	389	.dev_open = dev_open,
	390	.dev_close = dev_close,
	391	.dev_acquisition_start = dev_acquisition_start,
	392	.dev_acquisition_stop = dev_acquisition_stop,
	393	.priv = NULL,
	394	};