[libsigrok.git] / hardware / rigol-ds1xx2 / api.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2012 Martin Ling <martin-git@earth.li>
 *
 * 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 <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"

#define NUM_PROBES 2

static const int hwcaps[] = {
	SR_HWCAP_OSCILLOSCOPE,
	SR_HWCAP_LIMIT_SAMPLES,
	SR_HWCAP_TIMEBASE,
	SR_HWCAP_TRIGGER_SOURCE,
	SR_HWCAP_TRIGGER_SLOPE,
	SR_HWCAP_HORIZ_TRIGGERPOS,
	SR_HWCAP_VDIV,
	SR_HWCAP_COUPLING,
	0,
};

static const char *probe_names[] = {
	"CH1", "CH2",
	NULL,
};

static const struct sr_rational timebases[] = {
	/* nanoseconds */
	{ 2, 1000000000 },
	{ 5, 1000000000 },
	{ 10, 1000000000 },
	{ 20, 1000000000 },
	{ 50, 1000000000 },
	{ 100, 1000000000 },
	{ 500, 1000000000 },
	/* microseconds */
	{ 1, 1000000 },
	{ 2, 1000000 },
	{ 5, 1000000 },
	{ 10, 1000000 },
	{ 20, 1000000 },
	{ 50, 1000000 },
	{ 100, 1000000 },
	{ 200, 1000000 },
	{ 500, 1000000 },
	/* milliseconds */
	{ 1, 1000 },
	{ 2, 1000 },
	{ 5, 1000 },
	{ 10, 1000 },
	{ 20, 1000 },
	{ 50, 1000 },
	{ 100, 1000 },
	{ 200, 1000 },
	{ 500, 1000 },
	/* seconds */
	{ 1, 1 },
	{ 2, 1 },
	{ 5, 1 },
	{ 10, 1 },
	{ 20, 1 },
	{ 50, 1 },
	{ 0, 0},
};

static const struct sr_rational vdivs[] = {
	/* millivolts */
	{ 2, 1000 },
	{ 5, 1000 },
	{ 10, 1000 },
	{ 20, 1000 },
	{ 50, 1000 },
	{ 100, 1000 },
	{ 200, 1000 },
	{ 500, 1000 },
	/* volts */
	{ 1, 1 },
	{ 2, 1 },
	{ 5, 1 },
	{ 10, 1 },
	{ 0, 0 },
};

static const char *trigger_sources[] = {
	"CH1",
	"CH2",
	"EXT",
	"AC Line",
	NULL,
};

static const char *coupling[] = {
	"AC",
	"DC",
	"GND",
	NULL,
};

SR_PRIV struct sr_dev_driver rigol_ds1xx2_driver_info;
static struct sr_dev_driver *di = &rigol_ds1xx2_driver_info;

/* Properly close and free all devices. */
static int clear_instances(void)
{
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	struct dev_context *devc;
	GSList *l;

	if (!(drvc = di->priv))
		return SR_OK;

	for (l = drvc->instances; l; l = l->next) {
		if (!(sdi = l->data))
			continue;
		if (!(devc = sdi->priv))
			continue;

		close(devc->fd);

		sr_dev_inst_free(sdi);
	}

	g_slist_free(drvc->instances);
	drvc->instances = NULL;

	return SR_OK;
}

static int hw_init(struct sr_context *sr_ctx)
{
	struct drv_context *drvc;
	(void)sr_ctx;

	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
		sr_err("Driver context malloc failed.");
		return SR_ERR_MALLOC;
	}

	di->priv = drvc;

	return SR_OK;
}

static GSList *hw_scan(GSList *options)
{
	struct drv_context *drvc;
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	struct sr_probe *probe;
	GSList *devices;
	int i;

	(void)options;

	devices = NULL;
	drvc = di->priv;
	drvc->instances = NULL;

	if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "Rigol", "DS1xx2", NULL)))
		return NULL;
	if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
		return NULL;

	sdi->priv = devc;
	sdi->driver = di;

	for (i = 0; i < 2; i++)
	{
		if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, i == 0 ? "CH1" : "CH2")))
			return NULL;
		sdi->probes = g_slist_append(sdi->probes, probe);
	}
	drvc->instances = g_slist_append(drvc->instances, sdi);
	devices = g_slist_append(devices, sdi);

	return devices;
}

static GSList *hw_dev_list(void)
{
	struct drv_context *drvc;

	drvc = di->priv;

	return drvc->instances;
}

static int hw_dev_open(struct sr_dev_inst *sdi)
{
	int fd = open("/dev/usbtmc1", O_RDWR);

	if (fd == -1)
		return SR_ERR;

	struct dev_context *devc = sdi->priv;
	devc->fd = fd;

	devc->scale = 1;

	return SR_OK;
}

static int hw_dev_close(struct sr_dev_inst *sdi)
{
	struct dev_context *devc = sdi->priv;

	close(devc->fd);

	return SR_OK;
}

static int hw_cleanup(void)
{
	clear_instances();

	return SR_OK;
}

static int hw_info_get(int info_id, const void **data,
		       const struct sr_dev_inst *sdi)
{
	(void)sdi;

	switch (info_id) {
	case SR_DI_HWCAPS:
		*data = hwcaps;
		break;
	case SR_DI_NUM_PROBES:
		*data = GINT_TO_POINTER(NUM_PROBES);
		break;
	case SR_DI_PROBE_NAMES:
		*data = probe_names;
		break;
	case SR_DI_TIMEBASES:
		*data = timebases;
		break;
	case SR_DI_TRIGGER_SOURCES:
		*data = trigger_sources;
		break;
	case SR_DI_VDIVS:
		*data = vdivs;
		break;
	case SR_DI_COUPLING:
		*data = coupling;
		break;
	default:
		sr_err("Unknown info_id: %d.", info_id);
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
			     const void *value)
{
	struct dev_context *devc = sdi->priv;
	uint64_t tmp_u64;
	float tmp_float;
	struct sr_rational tmp_rat;
	int ret, i, j;
	char *channel;

	if (sdi->status != SR_ST_ACTIVE) {
		sr_err("Device inactive, can't set config options.");
		return SR_ERR;
	}

	ret = SR_OK;
	switch (hwcap) {
    case SR_HWCAP_LIMIT_FRAMES:
		devc->limit_frames = *(const uint64_t *)value;
		break;
	case SR_HWCAP_TRIGGER_SLOPE:
		tmp_u64 = *(const int *)value;
		rigol_ds1xx2_send_data(devc->fd, ":TRIG:EDGE:%s\n", tmp_u64 ? "POS" : "NEG");
		break;
	case SR_HWCAP_HORIZ_TRIGGERPOS:
		tmp_float = *(const float *)value;
		rigol_ds1xx2_send_data(devc->fd, ":TIM:OFFS %.9f\n", tmp_float);
		break;
	case SR_HWCAP_TIMEBASE:
		tmp_rat = *(const struct sr_rational *)value;
		rigol_ds1xx2_send_data(devc->fd, ":TIM:SCAL %.9f\n", (float) tmp_rat.p / tmp_rat.q);
		break;
	case SR_HWCAP_TRIGGER_SOURCE:
		if (!strcmp(value, "CH1"))
			channel = "CHAN1";
		else if (!strcmp(value, "CH2"))
			channel = "CHAN2";
		else if (!strcmp(value, "EXT"))
			channel = "EXT";
		else if (!strcmp(value, "AC Line"))
			channel = "ACL";
		else
			ret = SR_ERR_ARG;
			break;
		rigol_ds1xx2_send_data(devc->fd, ":TRIG:SOUR %s\n", channel);
		break;
	case SR_HWCAP_VDIV:
		/* TODO: Not supporting vdiv per channel yet. */
		tmp_rat = *(const struct sr_rational *)value;
		for (i = 0; vdivs[i].p && vdivs[i].q; i++) {
			if (vdivs[i].p == tmp_rat.p
					&& vdivs[i].q == tmp_rat.q) {
				devc->scale = (float) tmp_rat.p / tmp_rat.q;
				for (j = 0; j < 2; j++)
					rigol_ds1xx2_send_data(devc->fd, ":CHAN%d:SCAL %.3f\n", j, devc->scale);
				break;
			}
		}
		if (vdivs[i].p == 0 && vdivs[i].q == 0)
			ret = SR_ERR_ARG;
		break;
	case SR_HWCAP_COUPLING:
		/* TODO: Not supporting coupling per channel yet. */
		for (i = 0; coupling[i]; i++) {
			if (!strcmp(value, coupling[i])) {
				for (j = 0; j < 2; j++)
					rigol_ds1xx2_send_data(devc->fd, ":CHAN%d:COUP %s\n", j, coupling[i]);
				break;
			}
		}
		if (coupling[i] == 0)
			ret = SR_ERR_ARG;
		break;
	default:
		sr_err("Unknown hardware capability: %d.", hwcap);
		ret = SR_ERR_ARG;
	}

	return ret;
}

static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
				    void *cb_data)
{
	struct dev_context *devc = sdi->priv;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_header header;
	struct sr_datafeed_meta_analog meta;
	char buf[256];
	int len;
	(void)cb_data;

	devc->num_frames = 0;

	sr_source_add(devc->fd, G_IO_IN, 50, rigol_ds1xx2_receive_data, (void *)sdi);

	/* Send header packet to the session bus. */
	packet.type = SR_DF_HEADER;
	packet.payload = (unsigned char *)&header;
	header.feed_version = 1;
	gettimeofday(&header.starttime, NULL);
	sr_session_send(cb_data, &packet);

	/* Send metadata about the SR_DF_ANALOG packets to come. */
	packet.type = SR_DF_META_ANALOG;
	packet.payload = &meta;
	meta.num_probes = NUM_PROBES;
	sr_session_send(cb_data, &packet);

	rigol_ds1xx2_send_data(devc->fd, ":CHAN1:SCAL?\n");
	len = read(devc->fd, buf, sizeof(buf));
	buf[len] = 0;
	devc->scale = atof(buf);
	sr_dbg("scale is %.3f", devc->scale);
	rigol_ds1xx2_send_data(devc->fd, ":CHAN1:OFFS?\n");
	len = read(devc->fd, buf, sizeof(buf));
	buf[len] = 0;
	devc->offset = atof(buf);
	sr_dbg("offset is %.6f", devc->offset);
	rigol_ds1xx2_send_data(devc->fd, ":WAV:DATA?\n");

	return SR_OK;
}

static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
	struct dev_context *devc = sdi->priv;
	(void)cb_data;

	if (sdi->status != SR_ST_ACTIVE) {
		sr_err("Device inactive, can't stop acquisition.");
		return SR_ERR;
	}

	sr_source_remove(devc->fd);

	return SR_OK;
}

SR_PRIV struct sr_dev_driver rigol_ds1xx2_driver_info = {
	.name = "rigol-ds1xx2",
	.longname = "Rigol DS1xx2",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.scan = hw_scan,
	.dev_list = hw_dev_list,
	.dev_clear = clear_instances,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.info_get = hw_info_get,
	.dev_config_set = hw_dev_config_set,
	.dev_acquisition_start = hw_dev_acquisition_start,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
	.priv = NULL,
};
Commit	Line	Data
f4816ac6 ML	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2012 Martin Ling <martin-git@earth.li>
	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
e0b7d23c ML	20	#include <fcntl.h>
	21	#include <unistd.h>
	22	#include <stdlib.h>
	23	#include <string.h>
f4816ac6 ML	24	#include <glib.h>
	25	#include "libsigrok.h"
	26	#include "libsigrok-internal.h"
	27	#include "protocol.h"
	28
e0b7d23c ML	29	#define NUM_PROBES 2
	30
	31	static const int hwcaps[] = {
	32	SR_HWCAP_OSCILLOSCOPE,
	33	SR_HWCAP_LIMIT_SAMPLES,
	34	SR_HWCAP_TIMEBASE,
	35	SR_HWCAP_TRIGGER_SOURCE,
	36	SR_HWCAP_TRIGGER_SLOPE,
	37	SR_HWCAP_HORIZ_TRIGGERPOS,
	38	SR_HWCAP_VDIV,
	39	SR_HWCAP_COUPLING,
	40	0,
	41	};
	42
	43	static const char *probe_names[] = {
	44	"CH1", "CH2",
	45	NULL,
	46	};
	47
	48	static const struct sr_rational timebases[] = {
	49	/* nanoseconds */
	50	{ 2, 1000000000 },
	51	{ 5, 1000000000 },
	52	{ 10, 1000000000 },
	53	{ 20, 1000000000 },
	54	{ 50, 1000000000 },
	55	{ 100, 1000000000 },
	56	{ 500, 1000000000 },
	57	/* microseconds */
	58	{ 1, 1000000 },
	59	{ 2, 1000000 },
	60	{ 5, 1000000 },
	61	{ 10, 1000000 },
	62	{ 20, 1000000 },
	63	{ 50, 1000000 },
	64	{ 100, 1000000 },
	65	{ 200, 1000000 },
	66	{ 500, 1000000 },
	67	/* milliseconds */
	68	{ 1, 1000 },
	69	{ 2, 1000 },
	70	{ 5, 1000 },
	71	{ 10, 1000 },
	72	{ 20, 1000 },
	73	{ 50, 1000 },
	74	{ 100, 1000 },
	75	{ 200, 1000 },
	76	{ 500, 1000 },
	77	/* seconds */
	78	{ 1, 1 },
	79	{ 2, 1 },
	80	{ 5, 1 },
	81	{ 10, 1 },
	82	{ 20, 1 },
	83	{ 50, 1 },
	84	{ 0, 0},
	85	};
	86
	87	static const struct sr_rational vdivs[] = {
	88	/* millivolts */
	89	{ 2, 1000 },
	90	{ 5, 1000 },
	91	{ 10, 1000 },
	92	{ 20, 1000 },
93	{ 50, 1000 },
94	{ 100, 1000 },
95	{ 200, 1000 },
96	{ 500, 1000 },
97	/* volts */
98	{ 1, 1 },
99	{ 2, 1 },
100	{ 5, 1 },
101	{ 10, 1 },
102	{ 0, 0 },
103	};
104
105	static const char *trigger_sources[] = {
106	"CH1",
107	"CH2",
108	"EXT",
109	"AC Line",
110	NULL,
111	};
112
113	static const char *coupling[] = {
114	"AC",
115	"DC",
116	"GND",
117	NULL,
118	};
119
f4816ac6 ML	120	SR_PRIV struct sr_dev_driver rigol_ds1xx2_driver_info;
	121	static struct sr_dev_driver *di = &rigol_ds1xx2_driver_info;
	122
	123	/* Properly close and free all devices. */
	124	static int clear_instances(void)
	125	{
	126	struct sr_dev_inst *sdi;
	127	struct drv_context *drvc;
	128	struct dev_context *devc;
	129	GSList *l;
	130
	131	if (!(drvc = di->priv))
	132	return SR_OK;
	133
	134	for (l = drvc->instances; l; l = l->next) {
	135	if (!(sdi = l->data))
	136	continue;
	137	if (!(devc = sdi->priv))
	138	continue;
	139
e0b7d23c	140	close(devc->fd);
f4816ac6 ML	141
	142	sr_dev_inst_free(sdi);
	143	}
	144
	145	g_slist_free(drvc->instances);
	146	drvc->instances = NULL;
	147
	148	return SR_OK;
	149	}
	150
e0b7d23c	151	static int hw_init(struct sr_context *sr_ctx)
f4816ac6 ML	152	{
f4816ac6 ML	153	struct drv_context *drvc;
e0b7d23c	154	(void)sr_ctx;
f4816ac6 ML	155
	156	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	157	sr_err("Driver context malloc failed.");
	158	return SR_ERR_MALLOC;
	159	}
	160
f4816ac6 ML	161	di->priv = drvc;
	162
	163	return SR_OK;
	164	}
	165
	166	static GSList hw_scan(GSList options)
	167	{
	168	struct drv_context *drvc;
e0b7d23c ML	169	struct sr_dev_inst *sdi;
	170	struct dev_context *devc;
	171	struct sr_probe *probe;
f4816ac6	172	GSList *devices;
e0b7d23c	173	int i;
f4816ac6 ML	174
	175	(void)options;
	176
	177	devices = NULL;
	178	drvc = di->priv;
	179	drvc->instances = NULL;
	180
e0b7d23c ML	181	if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "Rigol", "DS1xx2", NULL)))
	182	return NULL;
	183	if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
	184	return NULL;
	185
	186	sdi->priv = devc;
	187	sdi->driver = di;
	188
	189	for (i = 0; i < 2; i++)
	190	{
	191	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, i == 0 ? "CH1" : "CH2")))
	192	return NULL;
	193	sdi->probes = g_slist_append(sdi->probes, probe);
	194	}
	195	drvc->instances = g_slist_append(drvc->instances, sdi);
	196	devices = g_slist_append(devices, sdi);
f4816ac6 ML	197
	198	return devices;
	199	}
	200
	201	static GSList *hw_dev_list(void)
	202	{
	203	struct drv_context *drvc;
	204
	205	drvc = di->priv;
	206
	207	return drvc->instances;
	208	}
	209
	210	static int hw_dev_open(struct sr_dev_inst *sdi)
	211	{
e0b7d23c ML	212	int fd = open("/dev/usbtmc1", O_RDWR);
	213
	214	if (fd == -1)
	215	return SR_ERR;
	216
	217	struct dev_context *devc = sdi->priv;
	218	devc->fd = fd;
	219
	220	devc->scale = 1;
f4816ac6 ML	221
	222	return SR_OK;
	223	}
	224
	225	static int hw_dev_close(struct sr_dev_inst *sdi)
	226	{
e0b7d23c ML	227	struct dev_context *devc = sdi->priv;
	228
	229	close(devc->fd);
f4816ac6 ML	230
	231	return SR_OK;
	232	}
	233
	234	static int hw_cleanup(void)
	235	{
	236	clear_instances();
	237
f4816ac6 ML	238	return SR_OK;
	239	}
	240
	241	static int hw_info_get(int info_id, const void **data,
	242	const struct sr_dev_inst *sdi)
	243	{
e0b7d23c ML	244	(void)sdi;
e0b7d23c ML	245
f4816ac6	246	switch (info_id) {
e0b7d23c ML	247	case SR_DI_HWCAPS:
	248	*data = hwcaps;
	249	break;
	250	case SR_DI_NUM_PROBES:
	251	*data = GINT_TO_POINTER(NUM_PROBES);
	252	break;
	253	case SR_DI_PROBE_NAMES:
	254	*data = probe_names;
	255	break;
	256	case SR_DI_TIMEBASES:
	257	*data = timebases;
	258	break;
	259	case SR_DI_TRIGGER_SOURCES:
	260	*data = trigger_sources;
	261	break;
	262	case SR_DI_VDIVS:
	263	*data = vdivs;
	264	break;
	265	case SR_DI_COUPLING:
	266	*data = coupling;
	267	break;
f4816ac6 ML	268	default:
	269	sr_err("Unknown info_id: %d.", info_id);
	270	return SR_ERR_ARG;
	271	}
	272
	273	return SR_OK;
	274	}
	275
	276	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	277	const void *value)
	278	{
e0b7d23c ML	279	struct dev_context *devc = sdi->priv;
	280	uint64_t tmp_u64;
	281	float tmp_float;
	282	struct sr_rational tmp_rat;
	283	int ret, i, j;
	284	char *channel;
f4816ac6 ML	285
	286	if (sdi->status != SR_ST_ACTIVE) {
	287	sr_err("Device inactive, can't set config options.");
	288	return SR_ERR;
	289	}
	290
	291	ret = SR_OK;
	292	switch (hwcap) {
e0b7d23c ML	293	case SR_HWCAP_LIMIT_FRAMES:
	294	devc->limit_frames = (const uint64_t )value;
	295	break;
	296	case SR_HWCAP_TRIGGER_SLOPE:
	297	tmp_u64 = (const int )value;
542843f7	298	rigol_ds1xx2_send_data(devc->fd, ":TRIG:EDGE:%s\n", tmp_u64 ? "POS" : "NEG");
e0b7d23c ML	299	break;
	300	case SR_HWCAP_HORIZ_TRIGGERPOS:
	301	tmp_float = (const float )value;
542843f7	302	rigol_ds1xx2_send_data(devc->fd, ":TIM:OFFS %.9f\n", tmp_float);
e0b7d23c ML	303	break;
	304	case SR_HWCAP_TIMEBASE:
	305	tmp_rat = (const struct sr_rational )value;
542843f7	306	rigol_ds1xx2_send_data(devc->fd, ":TIM:SCAL %.9f\n", (float) tmp_rat.p / tmp_rat.q);
e0b7d23c ML	307	break;
	308	case SR_HWCAP_TRIGGER_SOURCE:
	309	if (!strcmp(value, "CH1"))
	310	channel = "CHAN1";
	311	else if (!strcmp(value, "CH2"))
	312	channel = "CHAN2";
	313	else if (!strcmp(value, "EXT"))
	314	channel = "EXT";
	315	else if (!strcmp(value, "AC Line"))
	316	channel = "ACL";
	317	else
	318	ret = SR_ERR_ARG;
	319	break;
542843f7	320	rigol_ds1xx2_send_data(devc->fd, ":TRIG:SOUR %s\n", channel);
e0b7d23c ML	321	break;
	322	case SR_HWCAP_VDIV:
	323	/* TODO: Not supporting vdiv per channel yet. */
	324	tmp_rat = (const struct sr_rational )value;
	325	for (i = 0; vdivs[i].p && vdivs[i].q; i++) {
	326	if (vdivs[i].p == tmp_rat.p
	327	&& vdivs[i].q == tmp_rat.q) {
	328	devc->scale = (float) tmp_rat.p / tmp_rat.q;
	329	for (j = 0; j < 2; j++)
542843f7	330	rigol_ds1xx2_send_data(devc->fd, ":CHAN%d:SCAL %.3f\n", j, devc->scale);
e0b7d23c ML	331	break;
	332	}
	333	}
	334	if (vdivs[i].p == 0 && vdivs[i].q == 0)
	335	ret = SR_ERR_ARG;
	336	break;
	337	case SR_HWCAP_COUPLING:
	338	/* TODO: Not supporting coupling per channel yet. */
	339	for (i = 0; coupling[i]; i++) {
	340	if (!strcmp(value, coupling[i])) {
	341	for (j = 0; j < 2; j++)
542843f7	342	rigol_ds1xx2_send_data(devc->fd, ":CHAN%d:COUP %s\n", j, coupling[i]);
e0b7d23c ML	343	break;
	344	}
	345	}
	346	if (coupling[i] == 0)
	347	ret = SR_ERR_ARG;
	348	break;
f4816ac6 ML	349	default:
	350	sr_err("Unknown hardware capability: %d.", hwcap);
	351	ret = SR_ERR_ARG;
	352	}
	353
	354	return ret;
	355	}
	356
	357	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	358	void *cb_data)
	359	{
e0b7d23c ML	360	struct dev_context *devc = sdi->priv;
	361	struct sr_datafeed_packet packet;
	362	struct sr_datafeed_header header;
	363	struct sr_datafeed_meta_analog meta;
	364	char buf[256];
	365	int len;
	366	(void)cb_data;
	367
	368	devc->num_frames = 0;
	369
	370	sr_source_add(devc->fd, G_IO_IN, 50, rigol_ds1xx2_receive_data, (void *)sdi);
	371
	372	/* Send header packet to the session bus. */
	373	packet.type = SR_DF_HEADER;
	374	packet.payload = (unsigned char *)&header;
	375	header.feed_version = 1;
	376	gettimeofday(&header.starttime, NULL);
	377	sr_session_send(cb_data, &packet);
	378
	379	/* Send metadata about the SR_DF_ANALOG packets to come. */
	380	packet.type = SR_DF_META_ANALOG;
	381	packet.payload = &meta;
	382	meta.num_probes = NUM_PROBES;
	383	sr_session_send(cb_data, &packet);
	384
	385	rigol_ds1xx2_send_data(devc->fd, ":CHAN1:SCAL?\n");
	386	len = read(devc->fd, buf, sizeof(buf));
	387	buf[len] = 0;
	388	devc->scale = atof(buf);
542843f7	389	sr_dbg("scale is %.3f", devc->scale);
e0b7d23c ML	390	rigol_ds1xx2_send_data(devc->fd, ":CHAN1:OFFS?\n");
	391	len = read(devc->fd, buf, sizeof(buf));
	392	buf[len] = 0;
	393	devc->offset = atof(buf);
542843f7	394	sr_dbg("offset is %.6f", devc->offset);
e0b7d23c	395	rigol_ds1xx2_send_data(devc->fd, ":WAV:DATA?\n");
f4816ac6 ML	396
	397	return SR_OK;
	398	}
	399
	400	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	401	{
e0b7d23c	402	struct dev_context *devc = sdi->priv;
f4816ac6 ML	403	(void)cb_data;
	404
	405	if (sdi->status != SR_ST_ACTIVE) {
	406	sr_err("Device inactive, can't stop acquisition.");
	407	return SR_ERR;
	408	}
	409
e0b7d23c	410	sr_source_remove(devc->fd);
f4816ac6 ML	411
	412	return SR_OK;
	413	}
	414
	415	SR_PRIV struct sr_dev_driver rigol_ds1xx2_driver_info = {
	416	.name = "rigol-ds1xx2",
	417	.longname = "Rigol DS1xx2",
	418	.api_version = 1,
	419	.init = hw_init,
	420	.cleanup = hw_cleanup,
	421	.scan = hw_scan,
	422	.dev_list = hw_dev_list,
	423	.dev_clear = clear_instances,
	424	.dev_open = hw_dev_open,
	425	.dev_close = hw_dev_close,
	426	.info_get = hw_info_get,
	427	.dev_config_set = hw_dev_config_set,
	428	.dev_acquisition_start = hw_dev_acquisition_start,
	429	.dev_acquisition_stop = hw_dev_acquisition_stop,
	430	.priv = NULL,
	431	};