[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,
};

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];
	GVariant *gvar;
	GVariantBuilder gvb;
	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:
			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 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[] = {
	26	SR_CONF_THERMOMETER,
	27	};
	28
6b80b80d	29	static const uint32_t devopts[] = {
e91bb0a6	30	SR_CONF_CONTINUOUS,
6b80b80d BG	31	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
	32	SR_CONF_LIMIT_MSEC \| SR_CONF_GET \| SR_CONF_SET,
	33	SR_CONF_SAMPLERATE \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
5fabeeac BG	34	};
5fabeeac BG	35
1fe04eb8 BG	36	/*
	37	* Currently there are two channel-group/probe options for ACME:
	38	* - SR_CONF_PROBE_FACTOR - allows to modify current shunt resistance
	39	* calibration
	40	* - SR_CONF_POWER_OFF - allows to remotely cut-off/restore power to
	41	* measured devices
	42	*
	43	* They are not static - we have to check each probe's capabilities in
	44	* config_list().
	45	*/
	46	#define MAX_DEVOPTS_CG 2
	47	#define HAS_PROBE_FACTOR (SR_CONF_PROBE_FACTOR \| SR_CONF_GET \| SR_CONF_SET)
	48	#define HAS_POWER_OFF (SR_CONF_POWER_OFF \| SR_CONF_GET \| SR_CONF_SET)
6b80b80d	49
391e23a9	50	#define MAX_SAMPLE_RATE 500 /* In Hz */
6b80b80d BG	51
	52	static const uint64_t samplerates[] = {
	53	SR_HZ(1),
	54	SR_HZ(MAX_SAMPLE_RATE),
	55	SR_HZ(1),
	56	};
	57
4f840ce9	58	static GSList scan(struct sr_dev_driver di, GSList *options)
dfaee1de	59	{
6b80b80d BG	60	struct dev_context *devc;
6b80b80d BG	61	struct sr_dev_inst *sdi;
6b80b80d BG	62	gboolean status;
6b80b80d BG	63	int i;
dfaee1de BG	64
	65	(void)options;
	66
6b80b80d BG	67	devc = g_malloc0(sizeof(struct dev_context));
	68	devc->samplerate = SR_HZ(10);
	69
	70	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	71	sdi->status = SR_ST_INACTIVE;
3d14ce49 UH	72	sdi->vendor = g_strdup("BayLibre");
3d14ce49 UH	73	sdi->model = g_strdup("ACME");
6b80b80d BG	74	sdi->priv = devc;
	75
	76	status = bl_acme_is_sane();
	77	if (!status)
	78	goto err_out;
	79
	80	/*
	81	* Iterate over all ACME connectors and check if any probes
	82	* are present.
	83	*/
	84	for (i = 0; i < MAX_PROBES; i++) {
	85	/*
	86	* First check if there's an energy probe on this connector. If
	87	* not, and we're already at the fifth probe - see if we can
	88	* detect a temperature probe.
	89	*/
	90	status = bl_acme_detect_probe(bl_acme_get_enrg_addr(i),
391e23a9	91	PROBE_NUM(i), ENRG_PROBE_NAME);
6b80b80d BG	92	if (status) {
6b80b80d BG	93	/* Energy probe detected. */
391e23a9 UH	94	status = bl_acme_register_probe(sdi, PROBE_ENRG,
391e23a9 UH	95	bl_acme_get_enrg_addr(i), PROBE_NUM(i));
6b80b80d BG	96	if (!status) {
	97	sr_err("Error registering power probe %d",
	98	PROBE_NUM(i));
	99	continue;
	100	}
6b80b80d BG	101	} else if (i >= TEMP_PRB_START_INDEX) {
6b80b80d BG	102	status = bl_acme_detect_probe(bl_acme_get_temp_addr(i),
391e23a9	103	PROBE_NUM(i), TEMP_PROBE_NAME);
6b80b80d BG	104	if (status) {
	105	/* Temperature probe detected. */
	106	status = bl_acme_register_probe(sdi,PROBE_TEMP,
391e23a9	107	bl_acme_get_temp_addr(i), PROBE_NUM(i));
6b80b80d BG	108	if (!status) {
	109	sr_err("Error registering temp "
	110	"probe %d", PROBE_NUM(i));
	111	continue;
	112	}
	113	}
6b80b80d BG	114	}
	115	}
	116
380ee96f BG	117	/*
	118	* Let's assume there's no ACME device present if no probe
	119	* has been registered.
	120	*/
98fec29e	121	if (!sdi->channel_groups)
380ee96f BG	122	goto err_out;
380ee96f BG	123
43376f33	124	return std_scan_complete(di, g_slist_append(NULL, sdi));
6b80b80d BG	125
	126	err_out:
	127	g_free(devc);
	128	sr_dev_inst_free(sdi);
	129
	130	return NULL;
dfaee1de BG	131	}
dfaee1de BG	132
6b80b80d BG	133	static int config_get(uint32_t key, GVariant **data,
	134	const struct sr_dev_inst *sdi,
	135	const struct sr_channel_group *cg)
dfaee1de	136	{
6b80b80d	137	struct dev_context *devc;
dfaee1de	138	int ret;
61f2b7f7	139	uint64_t shunt;
740ad48a	140	gboolean power_off;
dfaee1de	141
6b80b80d BG	142	devc = sdi->priv;
6b80b80d BG	143
dfaee1de BG	144	ret = SR_OK;
dfaee1de BG	145	switch (key) {
6b80b80d	146	case SR_CONF_LIMIT_SAMPLES:
6b80b80d	147	case SR_CONF_LIMIT_MSEC:
d54a7c42	148	ret = sr_sw_limits_config_get(&devc->limits, key, data);
6b80b80d BG	149	break;
	150	case SR_CONF_SAMPLERATE:
	151	*data = g_variant_new_uint64(devc->samplerate);
	152	break;
61f2b7f7 BG	153	case SR_CONF_PROBE_FACTOR:
	154	if (!cg)
	155	return SR_ERR_CHANNEL_GROUP;
	156	ret = bl_acme_get_shunt(cg, &shunt);
	157	if (ret == SR_OK)
	158	*data = g_variant_new_uint64(shunt);
	159	break;
740ad48a BG	160	case SR_CONF_POWER_OFF:
	161	if (!cg)
	162	return SR_ERR_CHANNEL_GROUP;
	163	ret = bl_acme_read_power_state(cg, &power_off);
	164	if (ret == SR_OK)
	165	*data = g_variant_new_boolean(power_off);
	166	break;
dfaee1de BG	167	default:
	168	return SR_ERR_NA;
	169	}
	170
	171	return ret;
	172	}
	173
6b80b80d BG	174	static int config_set(uint32_t key, GVariant *data,
	175	const struct sr_dev_inst *sdi,
	176	const struct sr_channel_group *cg)
dfaee1de	177	{
6b80b80d BG	178	struct dev_context *devc;
6b80b80d BG	179	uint64_t samplerate;
dfaee1de BG	180	int ret;
dfaee1de BG	181
6b80b80d BG	182	devc = sdi->priv;
6b80b80d BG	183
dfaee1de BG	184	ret = SR_OK;
dfaee1de BG	185	switch (key) {
6b80b80d	186	case SR_CONF_LIMIT_SAMPLES:
6b80b80d	187	case SR_CONF_LIMIT_MSEC:
d54a7c42	188	ret = sr_sw_limits_config_set(&devc->limits, key, data);
6b80b80d BG	189	break;
	190	case SR_CONF_SAMPLERATE:
	191	samplerate = g_variant_get_uint64(data);
	192	if (samplerate > MAX_SAMPLE_RATE) {
	193	sr_err("Maximum sample rate is %d", MAX_SAMPLE_RATE);
	194	ret = SR_ERR_SAMPLERATE;
	195	break;
	196	}
	197	devc->samplerate = samplerate;
7c91c22a	198	bl_acme_maybe_set_update_interval(sdi, samplerate);
6b80b80d	199	break;
61f2b7f7 BG	200	case SR_CONF_PROBE_FACTOR:
	201	if (!cg)
	202	return SR_ERR_CHANNEL_GROUP;
	203	ret = bl_acme_set_shunt(cg, g_variant_get_uint64(data));
	204	break;
740ad48a BG	205	case SR_CONF_POWER_OFF:
	206	if (!cg)
	207	return SR_ERR_CHANNEL_GROUP;
	208	ret = bl_acme_set_power_off(cg, g_variant_get_boolean(data));
	209	break;
dfaee1de BG	210	default:
	211	ret = SR_ERR_NA;
	212	}
	213
	214	return ret;
	215	}
	216
6b80b80d BG	217	static int config_list(uint32_t key, GVariant **data,
	218	const struct sr_dev_inst *sdi,
	219	const struct sr_channel_group *cg)
dfaee1de	220	{
1fe04eb8	221	uint32_t devopts_cg[MAX_DEVOPTS_CG];
6b80b80d BG	222	GVariant *gvar;
6b80b80d BG	223	GVariantBuilder gvb;
a9010323	224	int num_devopts_cg = 0;
dfaee1de	225
5fabeeac BG	226	if (!cg) {
	227	switch (key) {
	228	case SR_CONF_DEVICE_OPTIONS:
05199c0a	229	return STD_CONFIG_LIST(key, data, sdi, cg, NULL, drvopts, devopts);
5fabeeac BG	230	case SR_CONF_SAMPLERATE:
	231	g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
	232	gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
	233	samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
	234	g_variant_builder_add(&gvb, "{sv}",
	235	"samplerate-steps", gvar);
	236	*data = g_variant_builder_end(&gvb);
	237	break;
	238	default:
	239	return SR_ERR_NA;
	240	}
	241	} else {
	242	switch (key) {
	243	case SR_CONF_DEVICE_OPTIONS:
1fe04eb8 BG	244	if (bl_acme_get_probe_type(cg) == PROBE_ENRG)
	245	devopts_cg[num_devopts_cg++] = HAS_PROBE_FACTOR;
	246	if (bl_acme_probe_has_pws(cg))
	247	devopts_cg[num_devopts_cg++] = HAS_POWER_OFF;
	248
5fabeeac	249	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
1fe04eb8	250	devopts_cg, num_devopts_cg, sizeof(uint32_t));
5fabeeac BG	251	break;
	252	default:
	253	return SR_ERR_NA;
	254	}
dfaee1de BG	255	}
dfaee1de BG	256
a9010323	257	return SR_OK;
dfaee1de BG	258	}
dfaee1de BG	259
4e88b86c DL	260	static void dev_acquisition_close(const struct sr_dev_inst *sdi)
	261	{
	262	GSList *chl;
	263	struct sr_channel *ch;
	264
	265	for (chl = sdi->channels; chl; chl = chl->next) {
	266	ch = chl->data;
	267	bl_acme_close_channel(ch);
	268	}
	269	}
	270
	271	static int dev_acquisition_open(const struct sr_dev_inst *sdi)
	272	{
	273	GSList *chl;
	274	struct sr_channel *ch;
	275
	276	for (chl = sdi->channels; chl; chl = chl->next) {
	277	ch = chl->data;
	278	if (bl_acme_open_channel(ch)) {
	279	sr_err("Error opening channel %s", ch->name);
	280	dev_acquisition_close(sdi);
	281	return SR_ERR;
	282	}
	283	}
	284
	285	return 0;
	286	}
	287
695dc859	288	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
dfaee1de	289	{
6b80b80d	290	struct dev_context *devc;
a0648b1a DL	291	struct itimerspec tspec = {
	292	.it_interval = { 0, 0 },
	293	.it_value = { 0, 0 }
	294	};
6b80b80d	295
4e88b86c DL	296	if (dev_acquisition_open(sdi))
	297	return SR_ERR;
	298
6b80b80d	299	devc = sdi->priv;
a0648b1a DL	300	devc->samples_missed = 0;
	301	devc->timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
	302	if (devc->timer_fd < 0) {
	303	sr_err("Error creating timer fd");
	304	return SR_ERR;
	305	}
6b80b80d	306
a0648b1a	307	tspec.it_interval.tv_sec = 0;
7a1a3a36	308	tspec.it_interval.tv_nsec = SR_HZ_TO_NS(devc->samplerate);
a0648b1a DL	309	tspec.it_value = tspec.it_interval;
	310
	311	if (timerfd_settime(devc->timer_fd, 0, &tspec, NULL)) {
	312	sr_err("Failed to set timer");
	313	close(devc->timer_fd);
6b80b80d BG	314	return SR_ERR;
	315	}
	316
a0648b1a	317	devc->channel = g_io_channel_unix_new(devc->timer_fd);
6b80b80d BG	318	g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL);
	319	g_io_channel_set_encoding(devc->channel, NULL, NULL);
	320	g_io_channel_set_buffered(devc->channel, FALSE);
	321
	322	sr_session_source_add_channel(sdi->session, devc->channel,
a0648b1a	323	G_IO_IN \| G_IO_ERR, 1000, bl_acme_receive_data, (void *)sdi);
6b80b80d	324
bee2b016	325	std_session_send_df_header(sdi);
d54a7c42	326	sr_sw_limits_acquisition_start(&devc->limits);
dfaee1de BG	327
	328	return SR_OK;
	329	}
	330
695dc859	331	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
dfaee1de	332	{
6b80b80d BG	333	struct dev_context *devc;
6b80b80d BG	334
6b80b80d BG	335	devc = sdi->priv;
6b80b80d BG	336
f9b0ab6b	337	dev_acquisition_close(sdi);
6b80b80d BG	338	sr_session_source_remove_channel(sdi->session, devc->channel);
	339	g_io_channel_shutdown(devc->channel, FALSE, NULL);
	340	g_io_channel_unref(devc->channel);
	341	devc->channel = NULL;
	342
bee2b016	343	std_session_send_df_end(sdi);
dfaee1de	344
a0648b1a	345	if (devc->samples_missed > 0)
6433156c	346	sr_warn("%" PRIu64 " samples missed", devc->samples_missed);
a0648b1a	347
dfaee1de BG	348	return SR_OK;
	349	}
	350
dd5c48a6	351	static struct sr_dev_driver baylibre_acme_driver_info = {
dfaee1de	352	.name = "baylibre-acme",
6b80b80d	353	.longname = "BayLibre ACME (Another Cute Measurement Equipment)",
dfaee1de	354	.api_version = 1,
c2fdcc25	355	.init = std_init,
700d6b64	356	.cleanup = std_cleanup,
dfaee1de	357	.scan = scan,
c01bf34c	358	.dev_list = std_dev_list,
f778bf02	359	.dev_clear = std_dev_clear,
dfaee1de BG	360	.config_get = config_get,
	361	.config_set = config_set,
	362	.config_list = config_list,
4d67b9d9 UH	363	.dev_open = std_dummy_dev_open,
4d67b9d9 UH	364	.dev_close = std_dummy_dev_close,
dfaee1de BG	365	.dev_acquisition_start = dev_acquisition_start,
dfaee1de BG	366	.dev_acquisition_stop = dev_acquisition_stop,
41812aca	367	.context = NULL,
dfaee1de	368	};
dd5c48a6	369	SR_REGISTER_DEV_DRIVER(baylibre_acme_driver_info);