[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 drvopts[] = {
	SR_CONF_THERMOMETER,
	SR_CONF_POWERMETER,
};

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 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];
	int num_devopts_cg = 0;

	if (!cg) {
		switch (key) {
		case SR_CONF_DEVICE_OPTIONS:
			return STD_CONFIG_LIST(key, data, sdi, cg, NULL, drvopts, devopts);
		case SR_CONF_SAMPLERATE:
			*data = std_gvar_samplerates_steps(ARRAY_AND_SIZE(samplerates));
			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 = std_gvar_array_u32(devopts_cg, num_devopts_cg);
			break;
		default:
			return SR_ERR_NA;
		}
	}

	return SR_OK;
}

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,
	.dev_clear = std_dev_clear,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list,
	.dev_open = std_dummy_dev_open,
	.dev_close = std_dummy_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
dfaee1de BG	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
6ec6c43b	20	#include <config.h>
dfaee1de	21	#include "protocol.h"
a0648b1a DL	22	#include <time.h>
a0648b1a DL	23	#include <sys/timerfd.h>
dfaee1de	24
05199c0a UH	25	static const uint32_t drvopts[] = {
05199c0a UH	26	SR_CONF_THERMOMETER,
c8e789fa	27	SR_CONF_POWERMETER,
05199c0a UH	28	};
05199c0a UH	29
6b80b80d	30	static const uint32_t devopts[] = {
e91bb0a6	31	SR_CONF_CONTINUOUS,
6b80b80d BG	32	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
	33	SR_CONF_LIMIT_MSEC \| SR_CONF_GET \| SR_CONF_SET,
	34	SR_CONF_SAMPLERATE \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
5fabeeac BG	35	};
5fabeeac BG	36
1fe04eb8 BG	37	/*
	38	* Currently there are two channel-group/probe options for ACME:
	39	* - SR_CONF_PROBE_FACTOR - allows to modify current shunt resistance
	40	* calibration
	41	* - SR_CONF_POWER_OFF - allows to remotely cut-off/restore power to
	42	* measured devices
	43	*
	44	* They are not static - we have to check each probe's capabilities in
	45	* config_list().
	46	*/
	47	#define MAX_DEVOPTS_CG 2
	48	#define HAS_PROBE_FACTOR (SR_CONF_PROBE_FACTOR \| SR_CONF_GET \| SR_CONF_SET)
	49	#define HAS_POWER_OFF (SR_CONF_POWER_OFF \| SR_CONF_GET \| SR_CONF_SET)
6b80b80d	50
391e23a9	51	#define MAX_SAMPLE_RATE 500 /* In Hz */
6b80b80d BG	52
	53	static const uint64_t samplerates[] = {
	54	SR_HZ(1),
	55	SR_HZ(MAX_SAMPLE_RATE),
	56	SR_HZ(1),
	57	};
	58
4f840ce9	59	static GSList scan(struct sr_dev_driver di, GSList *options)
dfaee1de	60	{
6b80b80d BG	61	struct dev_context *devc;
6b80b80d BG	62	struct sr_dev_inst *sdi;
6b80b80d BG	63	gboolean status;
6b80b80d BG	64	int i;
dfaee1de BG	65
	66	(void)options;
	67
6b80b80d BG	68	devc = g_malloc0(sizeof(struct dev_context));
	69	devc->samplerate = SR_HZ(10);
	70
	71	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	72	sdi->status = SR_ST_INACTIVE;
3d14ce49 UH	73	sdi->vendor = g_strdup("BayLibre");
3d14ce49 UH	74	sdi->model = g_strdup("ACME");
6b80b80d BG	75	sdi->priv = devc;
	76
	77	status = bl_acme_is_sane();
	78	if (!status)
	79	goto err_out;
	80
	81	/*
	82	* Iterate over all ACME connectors and check if any probes
	83	* are present.
	84	*/
	85	for (i = 0; i < MAX_PROBES; i++) {
	86	/*
	87	* First check if there's an energy probe on this connector. If
	88	* not, and we're already at the fifth probe - see if we can
	89	* detect a temperature probe.
	90	*/
	91	status = bl_acme_detect_probe(bl_acme_get_enrg_addr(i),
391e23a9	92	PROBE_NUM(i), ENRG_PROBE_NAME);
6b80b80d BG	93	if (status) {
6b80b80d BG	94	/* Energy probe detected. */
391e23a9 UH	95	status = bl_acme_register_probe(sdi, PROBE_ENRG,
391e23a9 UH	96	bl_acme_get_enrg_addr(i), PROBE_NUM(i));
6b80b80d BG	97	if (!status) {
	98	sr_err("Error registering power probe %d",
	99	PROBE_NUM(i));
	100	continue;
	101	}
6b80b80d BG	102	} else if (i >= TEMP_PRB_START_INDEX) {
6b80b80d BG	103	status = bl_acme_detect_probe(bl_acme_get_temp_addr(i),
391e23a9	104	PROBE_NUM(i), TEMP_PROBE_NAME);
6b80b80d BG	105	if (status) {
	106	/* Temperature probe detected. */
	107	status = bl_acme_register_probe(sdi,PROBE_TEMP,
391e23a9	108	bl_acme_get_temp_addr(i), PROBE_NUM(i));
6b80b80d BG	109	if (!status) {
	110	sr_err("Error registering temp "
	111	"probe %d", PROBE_NUM(i));
	112	continue;
	113	}
	114	}
6b80b80d BG	115	}
	116	}
	117
380ee96f BG	118	/*
	119	* Let's assume there's no ACME device present if no probe
	120	* has been registered.
	121	*/
98fec29e	122	if (!sdi->channel_groups)
380ee96f BG	123	goto err_out;
380ee96f BG	124
43376f33	125	return std_scan_complete(di, g_slist_append(NULL, sdi));
6b80b80d BG	126
	127	err_out:
	128	g_free(devc);
	129	sr_dev_inst_free(sdi);
	130
	131	return NULL;
dfaee1de BG	132	}
dfaee1de BG	133
6b80b80d BG	134	static int config_get(uint32_t key, GVariant **data,
	135	const struct sr_dev_inst *sdi,
	136	const struct sr_channel_group *cg)
dfaee1de	137	{
6b80b80d	138	struct dev_context *devc;
dfaee1de	139	int ret;
61f2b7f7	140	uint64_t shunt;
740ad48a	141	gboolean power_off;
dfaee1de	142
6b80b80d BG	143	devc = sdi->priv;
6b80b80d BG	144
dfaee1de BG	145	ret = SR_OK;
dfaee1de BG	146	switch (key) {
6b80b80d	147	case SR_CONF_LIMIT_SAMPLES:
6b80b80d	148	case SR_CONF_LIMIT_MSEC:
d54a7c42	149	ret = sr_sw_limits_config_get(&devc->limits, key, data);
6b80b80d BG	150	break;
	151	case SR_CONF_SAMPLERATE:
	152	*data = g_variant_new_uint64(devc->samplerate);
	153	break;
61f2b7f7 BG	154	case SR_CONF_PROBE_FACTOR:
	155	if (!cg)
	156	return SR_ERR_CHANNEL_GROUP;
	157	ret = bl_acme_get_shunt(cg, &shunt);
	158	if (ret == SR_OK)
	159	*data = g_variant_new_uint64(shunt);
	160	break;
740ad48a BG	161	case SR_CONF_POWER_OFF:
	162	if (!cg)
	163	return SR_ERR_CHANNEL_GROUP;
	164	ret = bl_acme_read_power_state(cg, &power_off);
	165	if (ret == SR_OK)
	166	*data = g_variant_new_boolean(power_off);
	167	break;
dfaee1de BG	168	default:
	169	return SR_ERR_NA;
	170	}
	171
	172	return ret;
	173	}
	174
6b80b80d BG	175	static int config_set(uint32_t key, GVariant *data,
	176	const struct sr_dev_inst *sdi,
	177	const struct sr_channel_group *cg)
dfaee1de	178	{
6b80b80d BG	179	struct dev_context *devc;
6b80b80d BG	180	uint64_t samplerate;
dfaee1de BG	181	int ret;
dfaee1de BG	182
6b80b80d BG	183	devc = sdi->priv;
6b80b80d BG	184
dfaee1de BG	185	ret = SR_OK;
dfaee1de BG	186	switch (key) {
6b80b80d	187	case SR_CONF_LIMIT_SAMPLES:
6b80b80d	188	case SR_CONF_LIMIT_MSEC:
d54a7c42	189	ret = sr_sw_limits_config_set(&devc->limits, key, data);
6b80b80d BG	190	break;
	191	case SR_CONF_SAMPLERATE:
	192	samplerate = g_variant_get_uint64(data);
	193	if (samplerate > MAX_SAMPLE_RATE) {
	194	sr_err("Maximum sample rate is %d", MAX_SAMPLE_RATE);
	195	ret = SR_ERR_SAMPLERATE;
	196	break;
	197	}
	198	devc->samplerate = samplerate;
7c91c22a	199	bl_acme_maybe_set_update_interval(sdi, samplerate);
6b80b80d	200	break;
61f2b7f7 BG	201	case SR_CONF_PROBE_FACTOR:
	202	if (!cg)
	203	return SR_ERR_CHANNEL_GROUP;
	204	ret = bl_acme_set_shunt(cg, g_variant_get_uint64(data));
	205	break;
740ad48a BG	206	case SR_CONF_POWER_OFF:
	207	if (!cg)
	208	return SR_ERR_CHANNEL_GROUP;
	209	ret = bl_acme_set_power_off(cg, g_variant_get_boolean(data));
	210	break;
dfaee1de BG	211	default:
	212	ret = SR_ERR_NA;
	213	}
	214
	215	return ret;
	216	}
	217
6b80b80d BG	218	static int config_list(uint32_t key, GVariant **data,
	219	const struct sr_dev_inst *sdi,
	220	const struct sr_channel_group *cg)
dfaee1de	221	{
1fe04eb8	222	uint32_t devopts_cg[MAX_DEVOPTS_CG];
a9010323	223	int num_devopts_cg = 0;
dfaee1de	224
5fabeeac BG	225	if (!cg) {
	226	switch (key) {
	227	case SR_CONF_DEVICE_OPTIONS:
05199c0a	228	return STD_CONFIG_LIST(key, data, sdi, cg, NULL, drvopts, devopts);
5fabeeac	229	case SR_CONF_SAMPLERATE:
53012da6	230	*data = std_gvar_samplerates_steps(ARRAY_AND_SIZE(samplerates));
5fabeeac BG	231	break;
	232	default:
	233	return SR_ERR_NA;
	234	}
	235	} else {
	236	switch (key) {
	237	case SR_CONF_DEVICE_OPTIONS:
1fe04eb8 BG	238	if (bl_acme_get_probe_type(cg) == PROBE_ENRG)
	239	devopts_cg[num_devopts_cg++] = HAS_PROBE_FACTOR;
	240	if (bl_acme_probe_has_pws(cg))
	241	devopts_cg[num_devopts_cg++] = HAS_POWER_OFF;
	242
105df674	243	*data = std_gvar_array_u32(devopts_cg, num_devopts_cg);
5fabeeac BG	244	break;
	245	default:
	246	return SR_ERR_NA;
	247	}
dfaee1de BG	248	}
dfaee1de BG	249
a9010323	250	return SR_OK;
dfaee1de BG	251	}
dfaee1de BG	252
4e88b86c DL	253	static void dev_acquisition_close(const struct sr_dev_inst *sdi)
	254	{
	255	GSList *chl;
	256	struct sr_channel *ch;
	257
	258	for (chl = sdi->channels; chl; chl = chl->next) {
	259	ch = chl->data;
	260	bl_acme_close_channel(ch);
	261	}
	262	}
	263
	264	static int dev_acquisition_open(const struct sr_dev_inst *sdi)
	265	{
	266	GSList *chl;
	267	struct sr_channel *ch;
	268
	269	for (chl = sdi->channels; chl; chl = chl->next) {
	270	ch = chl->data;
	271	if (bl_acme_open_channel(ch)) {
	272	sr_err("Error opening channel %s", ch->name);
	273	dev_acquisition_close(sdi);
	274	return SR_ERR;
	275	}
	276	}
	277
	278	return 0;
	279	}
	280
695dc859	281	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
dfaee1de	282	{
6b80b80d	283	struct dev_context *devc;
a0648b1a DL	284	struct itimerspec tspec = {
	285	.it_interval = { 0, 0 },
	286	.it_value = { 0, 0 }
	287	};
6b80b80d	288
4e88b86c DL	289	if (dev_acquisition_open(sdi))
	290	return SR_ERR;
	291
6b80b80d	292	devc = sdi->priv;
a0648b1a DL	293	devc->samples_missed = 0;
	294	devc->timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
	295	if (devc->timer_fd < 0) {
	296	sr_err("Error creating timer fd");
	297	return SR_ERR;
	298	}
6b80b80d	299
a0648b1a	300	tspec.it_interval.tv_sec = 0;
7a1a3a36	301	tspec.it_interval.tv_nsec = SR_HZ_TO_NS(devc->samplerate);
a0648b1a DL	302	tspec.it_value = tspec.it_interval;
	303
	304	if (timerfd_settime(devc->timer_fd, 0, &tspec, NULL)) {
	305	sr_err("Failed to set timer");
	306	close(devc->timer_fd);
6b80b80d BG	307	return SR_ERR;
	308	}
	309
a0648b1a	310	devc->channel = g_io_channel_unix_new(devc->timer_fd);
6b80b80d BG	311	g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL);
	312	g_io_channel_set_encoding(devc->channel, NULL, NULL);
	313	g_io_channel_set_buffered(devc->channel, FALSE);
	314
	315	sr_session_source_add_channel(sdi->session, devc->channel,
a0648b1a	316	G_IO_IN \| G_IO_ERR, 1000, bl_acme_receive_data, (void *)sdi);
6b80b80d	317
bee2b016	318	std_session_send_df_header(sdi);
d54a7c42	319	sr_sw_limits_acquisition_start(&devc->limits);
dfaee1de BG	320
	321	return SR_OK;
	322	}
	323
695dc859	324	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
dfaee1de	325	{
6b80b80d BG	326	struct dev_context *devc;
6b80b80d BG	327
6b80b80d BG	328	devc = sdi->priv;
6b80b80d BG	329
f9b0ab6b	330	dev_acquisition_close(sdi);
6b80b80d BG	331	sr_session_source_remove_channel(sdi->session, devc->channel);
	332	g_io_channel_shutdown(devc->channel, FALSE, NULL);
	333	g_io_channel_unref(devc->channel);
	334	devc->channel = NULL;
	335
bee2b016	336	std_session_send_df_end(sdi);
dfaee1de	337
a0648b1a	338	if (devc->samples_missed > 0)
6433156c	339	sr_warn("%" PRIu64 " samples missed", devc->samples_missed);
a0648b1a	340
dfaee1de BG	341	return SR_OK;
	342	}
	343
dd5c48a6	344	static struct sr_dev_driver baylibre_acme_driver_info = {
dfaee1de	345	.name = "baylibre-acme",
6b80b80d	346	.longname = "BayLibre ACME (Another Cute Measurement Equipment)",
dfaee1de	347	.api_version = 1,
c2fdcc25	348	.init = std_init,
700d6b64	349	.cleanup = std_cleanup,
dfaee1de	350	.scan = scan,
c01bf34c	351	.dev_list = std_dev_list,
f778bf02	352	.dev_clear = std_dev_clear,
dfaee1de BG	353	.config_get = config_get,
	354	.config_set = config_set,
	355	.config_list = config_list,
4d67b9d9 UH	356	.dev_open = std_dummy_dev_open,
4d67b9d9 UH	357	.dev_close = std_dummy_dev_close,
dfaee1de BG	358	.dev_acquisition_start = dev_acquisition_start,
dfaee1de BG	359	.dev_acquisition_stop = dev_acquisition_stop,
41812aca	360	.context = NULL,
dfaee1de	361	};
dd5c48a6	362	SR_REGISTER_DEV_DRIVER(baylibre_acme_driver_info);