[libsigrok.git] / src / hardware / scpi-pps / api.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2014 Bert Vermeulen <bert@biot.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 <string.h>
#include <strings.h>
#include "scpi.h"
#include "protocol.h"

SR_PRIV struct sr_dev_driver scpi_pps_driver_info;

static const uint32_t scanopts[] = {
	SR_CONF_CONN,
	SR_CONF_SERIALCOMM,
};

static const uint32_t drvopts[] = {
	SR_CONF_POWER_SUPPLY,
};

static const struct pps_channel_instance pci[] = {
	{ SR_MQ_VOLTAGE, SCPI_CMD_GET_MEAS_VOLTAGE, "V" },
	{ SR_MQ_CURRENT, SCPI_CMD_GET_MEAS_CURRENT, "I" },
	{ SR_MQ_POWER, SCPI_CMD_GET_MEAS_POWER, "P" },
	{ SR_MQ_FREQUENCY, SCPI_CMD_GET_MEAS_FREQUENCY, "F" },
};

static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
{
	return std_init(sr_ctx, di, LOG_PREFIX);
}

static struct sr_dev_inst *probe_device(struct sr_scpi_dev_inst *scpi)
{
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	struct sr_scpi_hw_info *hw_info;
	struct sr_channel_group *cg;
	struct sr_channel *ch;
	const struct scpi_pps *device;
	struct pps_channel *pch;
	struct channel_spec *channels;
	struct channel_group_spec *channel_groups, *cgs;
	struct pps_channel_group *pcg;
	GRegex *model_re;
	GMatchInfo *model_mi;
	GSList *l;
	uint64_t mask;
	unsigned int num_channels, num_channel_groups, ch_num, ch_idx, i, j;
	int ret;
	const char *vendor;
	char ch_name[16];

	if (sr_scpi_get_hw_id(scpi, &hw_info) != SR_OK) {
		sr_info("Couldn't get IDN response.");
		return NULL;
	}

	device = NULL;
	for (i = 0; i < num_pps_profiles; i++) {
		vendor = sr_vendor_alias(hw_info->manufacturer);
		if (g_ascii_strcasecmp(vendor, pps_profiles[i].vendor))
			continue;
		model_re = g_regex_new(pps_profiles[i].model, 0, 0, NULL);
		if (g_regex_match(model_re, hw_info->model, 0, &model_mi))
			device = &pps_profiles[i];
		g_match_info_unref(model_mi);
		g_regex_unref(model_re);
		if (device)
			break;
	}
	if (!device) {
		sr_scpi_hw_info_free(hw_info);
		return NULL;
	}

	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	sdi->status = SR_ST_INACTIVE;
	sdi->vendor = g_strdup(vendor);
	sdi->model = g_strdup(hw_info->model);
	sdi->version = g_strdup(hw_info->firmware_version);
	sdi->conn = scpi;
	sdi->driver = &scpi_pps_driver_info;
	sdi->inst_type = SR_INST_SCPI;
	sdi->serial_num = g_strdup(hw_info->serial_number);

	devc = g_malloc0(sizeof(struct dev_context));
	devc->device = device;
	sdi->priv = devc;

	if (device->num_channels) {
		/* Static channels and groups. */
		channels = (struct channel_spec *)device->channels;
		num_channels = device->num_channels;
		channel_groups = (struct channel_group_spec *)device->channel_groups;
		num_channel_groups = device->num_channel_groups;
	} else {
		/* Channels and groups need to be probed. */
		ret = device->probe_channels(sdi, hw_info, &channels, &num_channels,
				&channel_groups, &num_channel_groups);
		if (ret != SR_OK) {
			sr_err("Failed to probe for channels.");
			return NULL;
		}
		/*
		 * Since these were dynamically allocated, we'll need to free them
		 * later.
		 */
		devc->channels = channels;
		devc->channel_groups = channel_groups;
	}

	ch_idx = 0;
	for (ch_num = 0; ch_num < num_channels; ch_num++) {
		/* Create one channel per measurable output unit. */
		for (i = 0; i < ARRAY_SIZE(pci); i++) {
			if (!scpi_cmd_get(devc->device->commands, pci[i].command))
				continue;
			g_snprintf(ch_name, 16, "%s%s", pci[i].prefix,
					channels[ch_num].name);
			ch = sr_channel_new(sdi, ch_idx++, SR_CHANNEL_ANALOG, TRUE,
					ch_name);
			pch = g_malloc0(sizeof(struct pps_channel));
			pch->hw_output_idx = ch_num;
			pch->hwname = channels[ch_num].name;
			pch->mq = pci[i].mq;
			ch->priv = pch;
		}
	}

	for (i = 0; i < num_channel_groups; i++) {
		cgs = &channel_groups[i];
		cg = g_malloc0(sizeof(struct sr_channel_group));
		cg->name = g_strdup(cgs->name);
		for (j = 0, mask = 1; j < 64; j++, mask <<= 1) {
			if (cgs->channel_index_mask & mask) {
				for (l = sdi->channels; l; l = l->next) {
					ch = l->data;
					pch = ch->priv;
					if (pch->hw_output_idx == j)
						cg->channels = g_slist_append(cg->channels, ch);
				}
			}
		}
		pcg = g_malloc0(sizeof(struct pps_channel_group));
		pcg->features = cgs->features;
		cg->priv = pcg;
		sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
	}

	sr_scpi_hw_info_free(hw_info);
	hw_info = NULL;

	scpi_cmd(sdi, devc->device->commands, SCPI_CMD_LOCAL);
	sr_scpi_close(scpi);

	return sdi;
}

static GSList *scan(struct sr_dev_driver *di, GSList *options)
{
	return sr_scpi_scan(di->context, options, probe_device);
}

static GSList *dev_list(const struct sr_dev_driver *di)
{
	return ((struct drv_context *)(di->context))->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)
{
	struct dev_context *devc;
	struct sr_scpi_dev_inst *scpi;
	GVariant *beeper;

	if (sdi->status != SR_ST_INACTIVE)
		return SR_ERR;

	scpi = sdi->conn;
	if (sr_scpi_open(scpi) < 0)
		return SR_ERR;

	sdi->status = SR_ST_ACTIVE;

	devc = sdi->priv;
	scpi_cmd(sdi, devc->device->commands, SCPI_CMD_REMOTE);
	devc = sdi->priv;
	devc->beeper_was_set = FALSE;
	if (scpi_cmd_resp(sdi, devc->device->commands, &beeper,
			G_VARIANT_TYPE_BOOLEAN, SCPI_CMD_BEEPER) == SR_OK) {
		if (g_variant_get_boolean(beeper)) {
			devc->beeper_was_set = TRUE;
			scpi_cmd(sdi, devc->device->commands, SCPI_CMD_BEEPER_DISABLE);
		}
		g_variant_unref(beeper);
	}

	return SR_OK;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	struct sr_scpi_dev_inst *scpi;
	struct dev_context *devc;

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

	devc = sdi->priv;
	scpi = sdi->conn;
	if (scpi) {
		if (devc->beeper_was_set)
			scpi_cmd(sdi, devc->device->commands, SCPI_CMD_BEEPER_ENABLE);
		scpi_cmd(sdi, devc->device->commands, SCPI_CMD_LOCAL);
		sr_scpi_close(scpi);
		sdi->status = SR_ST_INACTIVE;
	}

	return SR_OK;
}

static void clear_helper(void *priv)
{
	struct dev_context *devc;

	devc = priv;
	g_free(devc->channels);
	g_free(devc->channel_groups);
	g_free(devc);
}

static int cleanup(const struct sr_dev_driver *di)
{
	return std_dev_clear(di, clear_helper);
}

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;
	const GVariantType *gvtype;
	unsigned int i;
	int cmd, ret;
	char *s;

	if (!sdi)
		return SR_ERR_ARG;

	devc = sdi->priv;

	if (cg) {
		/*
		 * These options only apply to channel groups with a single
		 * channel -- they're per-channel settings for the device.
		 */

		/*
		 * Config keys are handled below depending on whether a channel
		 * group was provided by the frontend. However some of these
		 * take a CG on one PPS but not on others. Check the device's
		 * profile for that here, and NULL out the channel group as needed.
		 */
		for (i = 0; i < devc->device->num_devopts; i++) {
			if (devc->device->devopts[i] == key) {
				cg = NULL;
				break;
			}
		}
	}

	gvtype = NULL;
	cmd = -1;
	switch (key) {
	case SR_CONF_ENABLED:
		gvtype = G_VARIANT_TYPE_BOOLEAN;
		cmd = SCPI_CMD_GET_OUTPUT_ENABLED;
		break;
	case SR_CONF_VOLTAGE:
		gvtype = G_VARIANT_TYPE_DOUBLE;
		cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
		break;
	case SR_CONF_VOLTAGE_TARGET:
		gvtype = G_VARIANT_TYPE_DOUBLE;
		cmd = SCPI_CMD_GET_VOLTAGE_TARGET;
		break;
	case SR_CONF_OUTPUT_FREQUENCY:
		gvtype = G_VARIANT_TYPE_DOUBLE;
		cmd = SCPI_CMD_GET_MEAS_FREQUENCY;
		break;
	case SR_CONF_OUTPUT_FREQUENCY_TARGET:
		gvtype = G_VARIANT_TYPE_DOUBLE;
		cmd = SCPI_CMD_GET_FREQUENCY_TARGET;
		break;
	case SR_CONF_CURRENT:
		gvtype = G_VARIANT_TYPE_DOUBLE;
		cmd = SCPI_CMD_GET_MEAS_CURRENT;
		break;
	case SR_CONF_CURRENT_LIMIT:
		gvtype = G_VARIANT_TYPE_DOUBLE;
		cmd = SCPI_CMD_GET_CURRENT_LIMIT;
		break;
	case SR_CONF_OVER_VOLTAGE_PROTECTION_ENABLED:
		gvtype = G_VARIANT_TYPE_BOOLEAN;
		cmd = SCPI_CMD_GET_OVER_VOLTAGE_PROTECTION_ENABLED;
		break;
	case SR_CONF_OVER_VOLTAGE_PROTECTION_ACTIVE:
		gvtype = G_VARIANT_TYPE_BOOLEAN;
		cmd = SCPI_CMD_GET_OVER_VOLTAGE_PROTECTION_ACTIVE;
		break;
	case SR_CONF_OVER_VOLTAGE_PROTECTION_THRESHOLD:
		gvtype = G_VARIANT_TYPE_DOUBLE;
		cmd = SCPI_CMD_GET_OVER_VOLTAGE_PROTECTION_THRESHOLD;
		break;
	case SR_CONF_OVER_CURRENT_PROTECTION_ENABLED:
		gvtype = G_VARIANT_TYPE_BOOLEAN;
		cmd = SCPI_CMD_GET_OVER_CURRENT_PROTECTION_ENABLED;
		break;
	case SR_CONF_OVER_CURRENT_PROTECTION_ACTIVE:
		gvtype = G_VARIANT_TYPE_BOOLEAN;
		cmd = SCPI_CMD_GET_OVER_CURRENT_PROTECTION_ACTIVE;
		break;
	case SR_CONF_OVER_CURRENT_PROTECTION_THRESHOLD:
		gvtype = G_VARIANT_TYPE_DOUBLE;
		cmd = SCPI_CMD_GET_OVER_CURRENT_PROTECTION_THRESHOLD;
		break;
	case SR_CONF_OVER_TEMPERATURE_PROTECTION:
		gvtype = G_VARIANT_TYPE_BOOLEAN;
		cmd = SCPI_CMD_GET_OVER_TEMPERATURE_PROTECTION;
		break;
	case SR_CONF_REGULATION:
		gvtype = G_VARIANT_TYPE_STRING;
		cmd = SCPI_CMD_GET_OUTPUT_REGULATION;
	}
	if (!gvtype)
		return SR_ERR_NA;

	if (cg)
		select_channel(sdi, cg->channels->data);
	ret = scpi_cmd_resp(sdi, devc->device->commands, data, gvtype, cmd);

	if (cmd == SCPI_CMD_GET_OUTPUT_REGULATION) {
		/*
		 * The Rigol DP800 series return CV/CC/UR, Philips PM2800
		 * return VOLT/CURR. We always return a GVariant string in
		 * the Rigol notation.
		 */
		if ((ret = sr_scpi_get_string(sdi->conn, NULL, &s)) != SR_OK)
			return ret;
		if (!strcmp(s, "CV") || !strcmp(s, "VOLT")) {
			*data = g_variant_new_string("CV");
		} else if (!strcmp(s, "CC") || !strcmp(s, "CURR")) {
			*data = g_variant_new_string("CC");
		} else if (!strcmp(s, "UR")) {
			*data = g_variant_new_string("UR");
		} else {
			sr_dbg("Unknown response to SCPI_CMD_GET_OUTPUT_REGULATION: %s", s);
			ret = SR_ERR_DATA;
		}
		g_free(s);
	}

	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;
	double d;
	int ret;

	if (!sdi)
		return SR_ERR_ARG;

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

	if (cg)
		/* Channel group specified. */
		select_channel(sdi, cg->channels->data);

	devc = sdi->priv;
	ret = SR_OK;
	switch (key) {
	case SR_CONF_ENABLED:
		if (g_variant_get_boolean(data))
			ret = scpi_cmd(sdi, devc->device->commands,
					SCPI_CMD_SET_OUTPUT_ENABLE);
		else
			ret = scpi_cmd(sdi, devc->device->commands,
					SCPI_CMD_SET_OUTPUT_DISABLE);
		break;
	case SR_CONF_VOLTAGE_TARGET:
		d = g_variant_get_double(data);
		ret = scpi_cmd(sdi, devc->device->commands,
				SCPI_CMD_SET_VOLTAGE_TARGET, d);
		break;
	case SR_CONF_OUTPUT_FREQUENCY_TARGET:
		d = g_variant_get_double(data);
		ret = scpi_cmd(sdi, devc->device->commands,
				SCPI_CMD_SET_FREQUENCY_TARGET, d);
		break;
	case SR_CONF_CURRENT_LIMIT:
		d = g_variant_get_double(data);
		ret = scpi_cmd(sdi, devc->device->commands,
				SCPI_CMD_SET_CURRENT_LIMIT, d);
		break;
	case SR_CONF_OVER_VOLTAGE_PROTECTION_ENABLED:
		if (g_variant_get_boolean(data))
			ret = scpi_cmd(sdi, devc->device->commands,
					SCPI_CMD_SET_OVER_VOLTAGE_PROTECTION_ENABLE);
		else
			ret = scpi_cmd(sdi, devc->device->commands,
					SCPI_CMD_SET_OVER_VOLTAGE_PROTECTION_DISABLE);
		break;
	case SR_CONF_OVER_VOLTAGE_PROTECTION_THRESHOLD:
		d = g_variant_get_double(data);
		ret = scpi_cmd(sdi, devc->device->commands,
				SCPI_CMD_SET_OVER_VOLTAGE_PROTECTION_THRESHOLD, d);
		break;
	case SR_CONF_OVER_CURRENT_PROTECTION_ENABLED:
		if (g_variant_get_boolean(data))
			ret = scpi_cmd(sdi, devc->device->commands,
					SCPI_CMD_SET_OVER_CURRENT_PROTECTION_ENABLE);
		else
			ret = scpi_cmd(sdi, devc->device->commands,
					SCPI_CMD_SET_OVER_CURRENT_PROTECTION_DISABLE);
		break;
	case SR_CONF_OVER_CURRENT_PROTECTION_THRESHOLD:
		d = g_variant_get_double(data);
		ret = scpi_cmd(sdi, devc->device->commands,
				SCPI_CMD_SET_OVER_CURRENT_PROTECTION_THRESHOLD, d);
		break;
	case SR_CONF_OVER_TEMPERATURE_PROTECTION:
		if (g_variant_get_boolean(data))
			ret = scpi_cmd(sdi, devc->device->commands,
					SCPI_CMD_SET_OVER_TEMPERATURE_PROTECTION_ENABLE);
		else
			ret = scpi_cmd(sdi, devc->device->commands,
					SCPI_CMD_SET_OVER_TEMPERATURE_PROTECTION_DISABLE);
		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)
{
	struct dev_context *devc;
	struct sr_channel *ch;
	const struct channel_spec *ch_spec;
	GVariant *gvar;
	GVariantBuilder gvb;
	int ret, i;
	const char *s[16];

	/* Always available, even without sdi. */
	if (key == SR_CONF_SCAN_OPTIONS) {
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
				scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
		return SR_OK;
	} else if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
				drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
		return SR_OK;
	}

	if (!sdi)
		return SR_ERR_ARG;
	devc = sdi->priv;

	ret = SR_OK;
	if (!cg) {
		/* No channel group: global options. */
		switch (key) {
		case SR_CONF_DEVICE_OPTIONS:
			*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
					devc->device->devopts, devc->device->num_devopts,
					sizeof(uint32_t));
			break;
		case SR_CONF_CHANNEL_CONFIG:
			/* Not used. */
			i = 0;
			if (devc->device->features & PPS_INDEPENDENT)
				s[i++] = "Independent";
			if (devc->device->features & PPS_SERIES)
				s[i++] = "Series";
			if (devc->device->features & PPS_PARALLEL)
				s[i++] = "Parallel";
			if (i == 0) {
				/*
				 * Shouldn't happen: independent-only devices
				 * shouldn't advertise this option at all.
				 */
				return SR_ERR_NA;
			}
			*data = g_variant_new_strv(s, i);
			break;
		default:
			return SR_ERR_NA;
		}
	} else {
		/* Channel group specified. */
		/*
		 * Per-channel-group options depending on a channel are actually
		 * done with the first channel. Channel groups in PPS can have
		 * more than one channel, but they will typically be of equal
		 * specification for use in series or parallel mode.
		 */
		ch = cg->channels->data;

		switch (key) {
		case SR_CONF_DEVICE_OPTIONS:
			*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
					devc->device->devopts_cg, devc->device->num_devopts_cg,
					sizeof(uint32_t));
			break;
		case SR_CONF_VOLTAGE_TARGET:
			ch_spec = &(devc->device->channels[ch->index]);
			g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
			/* Min, max, write resolution. */
			for (i = 0; i < 3; i++) {
				gvar = g_variant_new_double(ch_spec->voltage[i]);
				g_variant_builder_add_value(&gvb, gvar);
			}
			*data = g_variant_builder_end(&gvb);
			break;
		case SR_CONF_OUTPUT_FREQUENCY_TARGET:
			ch_spec = &(devc->device->channels[ch->index]);
			g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
			/* Min, max, write resolution. */
			for (i = 0; i < 3; i++) {
				gvar = g_variant_new_double(ch_spec->frequency[i]);
				g_variant_builder_add_value(&gvb, gvar);
			}
			*data = g_variant_builder_end(&gvb);
			break;
		case SR_CONF_CURRENT_LIMIT:
			g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
			/* Min, max, step. */
			for (i = 0; i < 3; i++) {
				ch_spec = &(devc->device->channels[ch->index]);
				gvar = g_variant_new_double(ch_spec->current[i]);
				g_variant_builder_add_value(&gvb, gvar);
			}
			*data = g_variant_builder_end(&gvb);
			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;
	struct sr_scpi_dev_inst *scpi;
	struct sr_channel *ch;
	struct pps_channel *pch;
	int cmd, ret;

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

	devc = sdi->priv;
	scpi = sdi->conn;
	devc->cb_data = cb_data;

	if ((ret = sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 10,
			scpi_pps_receive_data, (void *)sdi)) != SR_OK)
		return ret;
	std_session_send_df_header(sdi, LOG_PREFIX);

	/* Prime the pipe with the first channel's fetch. */
	ch = sr_next_enabled_channel(sdi, NULL);
	pch = ch->priv;
	if ((ret = select_channel(sdi, ch)) < 0)
		return ret;
	if (pch->mq == SR_MQ_VOLTAGE)
		cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
	else if (pch->mq == SR_MQ_FREQUENCY)
		cmd = SCPI_CMD_GET_MEAS_FREQUENCY;
	else if (pch->mq == SR_MQ_CURRENT)
		cmd = SCPI_CMD_GET_MEAS_CURRENT;
	else if (pch->mq == SR_MQ_POWER)
		cmd = SCPI_CMD_GET_MEAS_POWER;
	else
		return SR_ERR;
	scpi_cmd(sdi, devc->device->commands, cmd, pch->hwname);

	return SR_OK;
}

static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct sr_scpi_dev_inst *scpi;
	float f;

	(void)cb_data;

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

	scpi = sdi->conn;

	/*
	 * A requested value is certainly on the way. Retrieve it now,
	 * to avoid leaving the device in a state where it's not expecting
	 * commands.
	 */
	sr_scpi_get_float(scpi, NULL, &f);
	sr_scpi_source_remove(sdi->session, scpi);

	packet.type = SR_DF_END;
	sr_session_send(sdi, &packet);

	return SR_OK;
}

SR_PRIV struct sr_dev_driver scpi_pps_driver_info = {
	.name = "scpi-pps",
	.longname = "SCPI PPS",
	.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,
	.context = NULL,
};
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2014 Bert Vermeulen <bert@biot.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 <string.h>
	22	#include <strings.h>
	23	#include "scpi.h"
	24	#include "protocol.h"
	25
	26	SR_PRIV struct sr_dev_driver scpi_pps_driver_info;
	27
	28	static const uint32_t scanopts[] = {
	29	SR_CONF_CONN,
	30	SR_CONF_SERIALCOMM,
	31	};
	32
	33	static const uint32_t drvopts[] = {
	34	SR_CONF_POWER_SUPPLY,
	35	};
	36
	37	static const struct pps_channel_instance pci[] = {
	38	{ SR_MQ_VOLTAGE, SCPI_CMD_GET_MEAS_VOLTAGE, "V" },
	39	{ SR_MQ_CURRENT, SCPI_CMD_GET_MEAS_CURRENT, "I" },
	40	{ SR_MQ_POWER, SCPI_CMD_GET_MEAS_POWER, "P" },
	41	{ SR_MQ_FREQUENCY, SCPI_CMD_GET_MEAS_FREQUENCY, "F" },
	42	};
	43
	44	static int init(struct sr_dev_driver di, struct sr_context sr_ctx)
	45	{
	46	return std_init(sr_ctx, di, LOG_PREFIX);
	47	}
	48
	49	static struct sr_dev_inst probe_device(struct sr_scpi_dev_inst scpi)
	50	{
	51	struct dev_context *devc;
	52	struct sr_dev_inst *sdi;
	53	struct sr_scpi_hw_info *hw_info;
	54	struct sr_channel_group *cg;
	55	struct sr_channel *ch;
	56	const struct scpi_pps *device;
	57	struct pps_channel *pch;
	58	struct channel_spec *channels;
	59	struct channel_group_spec channel_groups, cgs;
	60	struct pps_channel_group *pcg;
	61	GRegex *model_re;
	62	GMatchInfo *model_mi;
	63	GSList *l;
	64	uint64_t mask;
	65	unsigned int num_channels, num_channel_groups, ch_num, ch_idx, i, j;
	66	int ret;
	67	const char *vendor;
	68	char ch_name[16];
	69
	70	if (sr_scpi_get_hw_id(scpi, &hw_info) != SR_OK) {
	71	sr_info("Couldn't get IDN response.");
	72	return NULL;
	73	}
	74
	75	device = NULL;
	76	for (i = 0; i < num_pps_profiles; i++) {
	77	vendor = sr_vendor_alias(hw_info->manufacturer);
	78	if (g_ascii_strcasecmp(vendor, pps_profiles[i].vendor))
	79	continue;
	80	model_re = g_regex_new(pps_profiles[i].model, 0, 0, NULL);
	81	if (g_regex_match(model_re, hw_info->model, 0, &model_mi))
	82	device = &pps_profiles[i];
	83	g_match_info_unref(model_mi);
	84	g_regex_unref(model_re);
	85	if (device)
	86	break;
	87	}
	88	if (!device) {
	89	sr_scpi_hw_info_free(hw_info);
	90	return NULL;
	91	}
	92
	93	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	94	sdi->status = SR_ST_INACTIVE;
	95	sdi->vendor = g_strdup(vendor);
	96	sdi->model = g_strdup(hw_info->model);
	97	sdi->version = g_strdup(hw_info->firmware_version);
	98	sdi->conn = scpi;
	99	sdi->driver = &scpi_pps_driver_info;
	100	sdi->inst_type = SR_INST_SCPI;
	101	sdi->serial_num = g_strdup(hw_info->serial_number);
	102
	103	devc = g_malloc0(sizeof(struct dev_context));
	104	devc->device = device;
	105	sdi->priv = devc;
	106
	107	if (device->num_channels) {
	108	/* Static channels and groups. */
	109	channels = (struct channel_spec *)device->channels;
	110	num_channels = device->num_channels;
	111	channel_groups = (struct channel_group_spec *)device->channel_groups;
	112	num_channel_groups = device->num_channel_groups;
	113	} else {
	114	/* Channels and groups need to be probed. */
	115	ret = device->probe_channels(sdi, hw_info, &channels, &num_channels,
	116	&channel_groups, &num_channel_groups);
	117	if (ret != SR_OK) {
	118	sr_err("Failed to probe for channels.");
	119	return NULL;
	120	}
	121	/*
	122	* Since these were dynamically allocated, we'll need to free them
	123	* later.
	124	*/
	125	devc->channels = channels;
	126	devc->channel_groups = channel_groups;
	127	}
	128
	129	ch_idx = 0;
	130	for (ch_num = 0; ch_num < num_channels; ch_num++) {
	131	/* Create one channel per measurable output unit. */
	132	for (i = 0; i < ARRAY_SIZE(pci); i++) {
	133	if (!scpi_cmd_get(devc->device->commands, pci[i].command))
	134	continue;
	135	g_snprintf(ch_name, 16, "%s%s", pci[i].prefix,
	136	channels[ch_num].name);
	137	ch = sr_channel_new(sdi, ch_idx++, SR_CHANNEL_ANALOG, TRUE,
	138	ch_name);
	139	pch = g_malloc0(sizeof(struct pps_channel));
	140	pch->hw_output_idx = ch_num;
	141	pch->hwname = channels[ch_num].name;
	142	pch->mq = pci[i].mq;
	143	ch->priv = pch;
	144	}
	145	}
	146
	147	for (i = 0; i < num_channel_groups; i++) {
	148	cgs = &channel_groups[i];
	149	cg = g_malloc0(sizeof(struct sr_channel_group));
	150	cg->name = g_strdup(cgs->name);
	151	for (j = 0, mask = 1; j < 64; j++, mask <<= 1) {
	152	if (cgs->channel_index_mask & mask) {
	153	for (l = sdi->channels; l; l = l->next) {
	154	ch = l->data;
	155	pch = ch->priv;
	156	if (pch->hw_output_idx == j)
	157	cg->channels = g_slist_append(cg->channels, ch);
	158	}
	159	}
	160	}
	161	pcg = g_malloc0(sizeof(struct pps_channel_group));
	162	pcg->features = cgs->features;
	163	cg->priv = pcg;
	164	sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
	165	}
	166
	167	sr_scpi_hw_info_free(hw_info);
	168	hw_info = NULL;
	169
	170	scpi_cmd(sdi, devc->device->commands, SCPI_CMD_LOCAL);
	171	sr_scpi_close(scpi);
	172
	173	return sdi;
	174	}
	175
	176	static GSList scan(struct sr_dev_driver di, GSList *options)
	177	{
	178	return sr_scpi_scan(di->context, options, probe_device);
	179	}
	180
	181	static GSList dev_list(const struct sr_dev_driver di)
	182	{
	183	return ((struct drv_context *)(di->context))->instances;
	184	}
	185
	186	static int dev_clear(const struct sr_dev_driver *di)
	187	{
	188	return std_dev_clear(di, NULL);
	189	}
	190
	191	static int dev_open(struct sr_dev_inst *sdi)
	192	{
	193	struct dev_context *devc;
	194	struct sr_scpi_dev_inst *scpi;
	195	GVariant *beeper;
	196
	197	if (sdi->status != SR_ST_INACTIVE)
	198	return SR_ERR;
	199
	200	scpi = sdi->conn;
	201	if (sr_scpi_open(scpi) < 0)
	202	return SR_ERR;
	203
	204	sdi->status = SR_ST_ACTIVE;
	205
	206	devc = sdi->priv;
	207	scpi_cmd(sdi, devc->device->commands, SCPI_CMD_REMOTE);
	208	devc = sdi->priv;
	209	devc->beeper_was_set = FALSE;
	210	if (scpi_cmd_resp(sdi, devc->device->commands, &beeper,
	211	G_VARIANT_TYPE_BOOLEAN, SCPI_CMD_BEEPER) == SR_OK) {
	212	if (g_variant_get_boolean(beeper)) {
	213	devc->beeper_was_set = TRUE;
	214	scpi_cmd(sdi, devc->device->commands, SCPI_CMD_BEEPER_DISABLE);
	215	}
	216	g_variant_unref(beeper);
	217	}
	218
	219	return SR_OK;
	220	}
	221
	222	static int dev_close(struct sr_dev_inst *sdi)
	223	{
	224	struct sr_scpi_dev_inst *scpi;
	225	struct dev_context *devc;
	226
	227	if (sdi->status != SR_ST_ACTIVE)
	228	return SR_ERR_DEV_CLOSED;
	229
	230	devc = sdi->priv;
	231	scpi = sdi->conn;
	232	if (scpi) {
	233	if (devc->beeper_was_set)
	234	scpi_cmd(sdi, devc->device->commands, SCPI_CMD_BEEPER_ENABLE);
	235	scpi_cmd(sdi, devc->device->commands, SCPI_CMD_LOCAL);
	236	sr_scpi_close(scpi);
	237	sdi->status = SR_ST_INACTIVE;
	238	}
	239
	240	return SR_OK;
	241	}
	242
	243	static void clear_helper(void *priv)
	244	{
	245	struct dev_context *devc;
	246
	247	devc = priv;
	248	g_free(devc->channels);
	249	g_free(devc->channel_groups);
	250	g_free(devc);
	251	}
	252
	253	static int cleanup(const struct sr_dev_driver *di)
	254	{
	255	return std_dev_clear(di, clear_helper);
	256	}
	257
	258	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	259	const struct sr_channel_group *cg)
	260	{
	261	struct dev_context *devc;
	262	const GVariantType *gvtype;
	263	unsigned int i;
	264	int cmd, ret;
	265	char *s;
	266
	267	if (!sdi)
	268	return SR_ERR_ARG;
	269
	270	devc = sdi->priv;
	271
	272	if (cg) {
	273	/*
	274	* These options only apply to channel groups with a single
	275	* channel -- they're per-channel settings for the device.
	276	*/
	277
	278	/*
	279	* Config keys are handled below depending on whether a channel
	280	* group was provided by the frontend. However some of these
	281	* take a CG on one PPS but not on others. Check the device's
	282	* profile for that here, and NULL out the channel group as needed.
	283	*/
	284	for (i = 0; i < devc->device->num_devopts; i++) {
	285	if (devc->device->devopts[i] == key) {
	286	cg = NULL;
	287	break;
	288	}
	289	}
	290	}
	291
	292	gvtype = NULL;
	293	cmd = -1;
	294	switch (key) {
	295	case SR_CONF_ENABLED:
	296	gvtype = G_VARIANT_TYPE_BOOLEAN;
	297	cmd = SCPI_CMD_GET_OUTPUT_ENABLED;
	298	break;
	299	case SR_CONF_VOLTAGE:
	300	gvtype = G_VARIANT_TYPE_DOUBLE;
	301	cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
	302	break;
	303	case SR_CONF_VOLTAGE_TARGET:
	304	gvtype = G_VARIANT_TYPE_DOUBLE;
	305	cmd = SCPI_CMD_GET_VOLTAGE_TARGET;
	306	break;
	307	case SR_CONF_OUTPUT_FREQUENCY:
	308	gvtype = G_VARIANT_TYPE_DOUBLE;
	309	cmd = SCPI_CMD_GET_MEAS_FREQUENCY;
	310	break;
	311	case SR_CONF_OUTPUT_FREQUENCY_TARGET:
	312	gvtype = G_VARIANT_TYPE_DOUBLE;
	313	cmd = SCPI_CMD_GET_FREQUENCY_TARGET;
	314	break;
	315	case SR_CONF_CURRENT:
	316	gvtype = G_VARIANT_TYPE_DOUBLE;
	317	cmd = SCPI_CMD_GET_MEAS_CURRENT;
	318	break;
	319	case SR_CONF_CURRENT_LIMIT:
	320	gvtype = G_VARIANT_TYPE_DOUBLE;
	321	cmd = SCPI_CMD_GET_CURRENT_LIMIT;
	322	break;
	323	case SR_CONF_OVER_VOLTAGE_PROTECTION_ENABLED:
	324	gvtype = G_VARIANT_TYPE_BOOLEAN;
	325	cmd = SCPI_CMD_GET_OVER_VOLTAGE_PROTECTION_ENABLED;
	326	break;
	327	case SR_CONF_OVER_VOLTAGE_PROTECTION_ACTIVE:
	328	gvtype = G_VARIANT_TYPE_BOOLEAN;
	329	cmd = SCPI_CMD_GET_OVER_VOLTAGE_PROTECTION_ACTIVE;
	330	break;
	331	case SR_CONF_OVER_VOLTAGE_PROTECTION_THRESHOLD:
	332	gvtype = G_VARIANT_TYPE_DOUBLE;
	333	cmd = SCPI_CMD_GET_OVER_VOLTAGE_PROTECTION_THRESHOLD;
	334	break;
	335	case SR_CONF_OVER_CURRENT_PROTECTION_ENABLED:
	336	gvtype = G_VARIANT_TYPE_BOOLEAN;
	337	cmd = SCPI_CMD_GET_OVER_CURRENT_PROTECTION_ENABLED;
	338	break;
	339	case SR_CONF_OVER_CURRENT_PROTECTION_ACTIVE:
	340	gvtype = G_VARIANT_TYPE_BOOLEAN;
	341	cmd = SCPI_CMD_GET_OVER_CURRENT_PROTECTION_ACTIVE;
	342	break;
	343	case SR_CONF_OVER_CURRENT_PROTECTION_THRESHOLD:
	344	gvtype = G_VARIANT_TYPE_DOUBLE;
	345	cmd = SCPI_CMD_GET_OVER_CURRENT_PROTECTION_THRESHOLD;
	346	break;
	347	case SR_CONF_OVER_TEMPERATURE_PROTECTION:
	348	gvtype = G_VARIANT_TYPE_BOOLEAN;
	349	cmd = SCPI_CMD_GET_OVER_TEMPERATURE_PROTECTION;
	350	break;
	351	case SR_CONF_REGULATION:
	352	gvtype = G_VARIANT_TYPE_STRING;
	353	cmd = SCPI_CMD_GET_OUTPUT_REGULATION;
	354	}
	355	if (!gvtype)
	356	return SR_ERR_NA;
	357
	358	if (cg)
	359	select_channel(sdi, cg->channels->data);
	360	ret = scpi_cmd_resp(sdi, devc->device->commands, data, gvtype, cmd);
	361
	362	if (cmd == SCPI_CMD_GET_OUTPUT_REGULATION) {
	363	/*
	364	* The Rigol DP800 series return CV/CC/UR, Philips PM2800
	365	* return VOLT/CURR. We always return a GVariant string in
	366	* the Rigol notation.
	367	*/
	368	if ((ret = sr_scpi_get_string(sdi->conn, NULL, &s)) != SR_OK)
	369	return ret;
	370	if (!strcmp(s, "CV") \|\| !strcmp(s, "VOLT")) {
	371	*data = g_variant_new_string("CV");
	372	} else if (!strcmp(s, "CC") \|\| !strcmp(s, "CURR")) {
	373	*data = g_variant_new_string("CC");
	374	} else if (!strcmp(s, "UR")) {
	375	*data = g_variant_new_string("UR");
	376	} else {
	377	sr_dbg("Unknown response to SCPI_CMD_GET_OUTPUT_REGULATION: %s", s);
	378	ret = SR_ERR_DATA;
	379	}
	380	g_free(s);
	381	}
	382
	383	return ret;
	384	}
	385
	386	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
	387	const struct sr_channel_group *cg)
	388	{
	389	struct dev_context *devc;
	390	double d;
	391	int ret;
	392
	393	if (!sdi)
	394	return SR_ERR_ARG;
	395
	396	if (sdi->status != SR_ST_ACTIVE)
	397	return SR_ERR_DEV_CLOSED;
	398
	399	if (cg)
	400	/* Channel group specified. */
	401	select_channel(sdi, cg->channels->data);
	402
	403	devc = sdi->priv;
	404	ret = SR_OK;
	405	switch (key) {
	406	case SR_CONF_ENABLED:
	407	if (g_variant_get_boolean(data))
	408	ret = scpi_cmd(sdi, devc->device->commands,
	409	SCPI_CMD_SET_OUTPUT_ENABLE);
	410	else
	411	ret = scpi_cmd(sdi, devc->device->commands,
	412	SCPI_CMD_SET_OUTPUT_DISABLE);
	413	break;
	414	case SR_CONF_VOLTAGE_TARGET:
	415	d = g_variant_get_double(data);
	416	ret = scpi_cmd(sdi, devc->device->commands,
	417	SCPI_CMD_SET_VOLTAGE_TARGET, d);
	418	break;
	419	case SR_CONF_OUTPUT_FREQUENCY_TARGET:
	420	d = g_variant_get_double(data);
	421	ret = scpi_cmd(sdi, devc->device->commands,
	422	SCPI_CMD_SET_FREQUENCY_TARGET, d);
	423	break;
	424	case SR_CONF_CURRENT_LIMIT:
	425	d = g_variant_get_double(data);
	426	ret = scpi_cmd(sdi, devc->device->commands,
	427	SCPI_CMD_SET_CURRENT_LIMIT, d);
	428	break;
	429	case SR_CONF_OVER_VOLTAGE_PROTECTION_ENABLED:
	430	if (g_variant_get_boolean(data))
	431	ret = scpi_cmd(sdi, devc->device->commands,
	432	SCPI_CMD_SET_OVER_VOLTAGE_PROTECTION_ENABLE);
	433	else
	434	ret = scpi_cmd(sdi, devc->device->commands,
	435	SCPI_CMD_SET_OVER_VOLTAGE_PROTECTION_DISABLE);
	436	break;
	437	case SR_CONF_OVER_VOLTAGE_PROTECTION_THRESHOLD:
	438	d = g_variant_get_double(data);
	439	ret = scpi_cmd(sdi, devc->device->commands,
	440	SCPI_CMD_SET_OVER_VOLTAGE_PROTECTION_THRESHOLD, d);
	441	break;
	442	case SR_CONF_OVER_CURRENT_PROTECTION_ENABLED:
	443	if (g_variant_get_boolean(data))
	444	ret = scpi_cmd(sdi, devc->device->commands,
	445	SCPI_CMD_SET_OVER_CURRENT_PROTECTION_ENABLE);
	446	else
	447	ret = scpi_cmd(sdi, devc->device->commands,
	448	SCPI_CMD_SET_OVER_CURRENT_PROTECTION_DISABLE);
	449	break;
	450	case SR_CONF_OVER_CURRENT_PROTECTION_THRESHOLD:
	451	d = g_variant_get_double(data);
	452	ret = scpi_cmd(sdi, devc->device->commands,
	453	SCPI_CMD_SET_OVER_CURRENT_PROTECTION_THRESHOLD, d);
	454	break;
	455	case SR_CONF_OVER_TEMPERATURE_PROTECTION:
	456	if (g_variant_get_boolean(data))
	457	ret = scpi_cmd(sdi, devc->device->commands,
	458	SCPI_CMD_SET_OVER_TEMPERATURE_PROTECTION_ENABLE);
	459	else
	460	ret = scpi_cmd(sdi, devc->device->commands,
	461	SCPI_CMD_SET_OVER_TEMPERATURE_PROTECTION_DISABLE);
	462	break;
	463	default:
	464	ret = SR_ERR_NA;
	465	}
	466
	467	return ret;
	468	}
	469
	470	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	471	const struct sr_channel_group *cg)
	472	{
	473	struct dev_context *devc;
	474	struct sr_channel *ch;
	475	const struct channel_spec *ch_spec;
	476	GVariant *gvar;
	477	GVariantBuilder gvb;
	478	int ret, i;
	479	const char *s[16];
	480
	481	/* Always available, even without sdi. */
	482	if (key == SR_CONF_SCAN_OPTIONS) {
	483	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	484	scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
	485	return SR_OK;
	486	} else if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
	487	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	488	drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
	489	return SR_OK;
	490	}
	491
	492	if (!sdi)
	493	return SR_ERR_ARG;
	494	devc = sdi->priv;
	495
	496	ret = SR_OK;
	497	if (!cg) {
	498	/* No channel group: global options. */
	499	switch (key) {
	500	case SR_CONF_DEVICE_OPTIONS:
	501	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	502	devc->device->devopts, devc->device->num_devopts,
	503	sizeof(uint32_t));
	504	break;
	505	case SR_CONF_CHANNEL_CONFIG:
	506	/* Not used. */
	507	i = 0;
	508	if (devc->device->features & PPS_INDEPENDENT)
	509	s[i++] = "Independent";
	510	if (devc->device->features & PPS_SERIES)
	511	s[i++] = "Series";
	512	if (devc->device->features & PPS_PARALLEL)
	513	s[i++] = "Parallel";
	514	if (i == 0) {
	515	/*
	516	* Shouldn't happen: independent-only devices
	517	* shouldn't advertise this option at all.
	518	*/
	519	return SR_ERR_NA;
	520	}
	521	*data = g_variant_new_strv(s, i);
	522	break;
	523	default:
	524	return SR_ERR_NA;
	525	}
	526	} else {
	527	/* Channel group specified. */
	528	/*
	529	* Per-channel-group options depending on a channel are actually
	530	* done with the first channel. Channel groups in PPS can have
	531	* more than one channel, but they will typically be of equal
	532	* specification for use in series or parallel mode.
	533	*/
	534	ch = cg->channels->data;
	535
	536	switch (key) {
	537	case SR_CONF_DEVICE_OPTIONS:
	538	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	539	devc->device->devopts_cg, devc->device->num_devopts_cg,
	540	sizeof(uint32_t));
	541	break;
	542	case SR_CONF_VOLTAGE_TARGET:
	543	ch_spec = &(devc->device->channels[ch->index]);
	544	g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
	545	/* Min, max, write resolution. */
	546	for (i = 0; i < 3; i++) {
	547	gvar = g_variant_new_double(ch_spec->voltage[i]);
	548	g_variant_builder_add_value(&gvb, gvar);
	549	}
	550	*data = g_variant_builder_end(&gvb);
	551	break;
	552	case SR_CONF_OUTPUT_FREQUENCY_TARGET:
	553	ch_spec = &(devc->device->channels[ch->index]);
	554	g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
	555	/* Min, max, write resolution. */
	556	for (i = 0; i < 3; i++) {
	557	gvar = g_variant_new_double(ch_spec->frequency[i]);
	558	g_variant_builder_add_value(&gvb, gvar);
	559	}
	560	*data = g_variant_builder_end(&gvb);
	561	break;
	562	case SR_CONF_CURRENT_LIMIT:
	563	g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
	564	/* Min, max, step. */
	565	for (i = 0; i < 3; i++) {
	566	ch_spec = &(devc->device->channels[ch->index]);
	567	gvar = g_variant_new_double(ch_spec->current[i]);
	568	g_variant_builder_add_value(&gvb, gvar);
	569	}
	570	*data = g_variant_builder_end(&gvb);
	571	break;
	572	default:
	573	return SR_ERR_NA;
	574	}
	575	}
	576
	577	return ret;
	578	}
	579
	580	static int dev_acquisition_start(const struct sr_dev_inst sdi, void cb_data)
	581	{
	582	struct dev_context *devc;
	583	struct sr_scpi_dev_inst *scpi;
	584	struct sr_channel *ch;
	585	struct pps_channel *pch;
	586	int cmd, ret;
	587
	588	if (sdi->status != SR_ST_ACTIVE)
	589	return SR_ERR_DEV_CLOSED;
	590
	591	devc = sdi->priv;
	592	scpi = sdi->conn;
	593	devc->cb_data = cb_data;
	594
	595	if ((ret = sr_scpi_source_add(sdi->session, scpi, G_IO_IN, 10,
	596	scpi_pps_receive_data, (void *)sdi)) != SR_OK)
	597	return ret;
	598	std_session_send_df_header(sdi, LOG_PREFIX);
	599
	600	/* Prime the pipe with the first channel's fetch. */
	601	ch = sr_next_enabled_channel(sdi, NULL);
	602	pch = ch->priv;
	603	if ((ret = select_channel(sdi, ch)) < 0)
	604	return ret;
	605	if (pch->mq == SR_MQ_VOLTAGE)
	606	cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
	607	else if (pch->mq == SR_MQ_FREQUENCY)
	608	cmd = SCPI_CMD_GET_MEAS_FREQUENCY;
	609	else if (pch->mq == SR_MQ_CURRENT)
	610	cmd = SCPI_CMD_GET_MEAS_CURRENT;
	611	else if (pch->mq == SR_MQ_POWER)
	612	cmd = SCPI_CMD_GET_MEAS_POWER;
	613	else
	614	return SR_ERR;
	615	scpi_cmd(sdi, devc->device->commands, cmd, pch->hwname);
	616
	617	return SR_OK;
	618	}
	619
	620	static int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	621	{
	622	struct sr_datafeed_packet packet;
	623	struct sr_scpi_dev_inst *scpi;
	624	float f;
	625
	626	(void)cb_data;
	627
	628	if (sdi->status != SR_ST_ACTIVE)
	629	return SR_ERR_DEV_CLOSED;
	630
	631	scpi = sdi->conn;
	632
	633	/*
	634	* A requested value is certainly on the way. Retrieve it now,
	635	* to avoid leaving the device in a state where it's not expecting
	636	* commands.
	637	*/
	638	sr_scpi_get_float(scpi, NULL, &f);
	639	sr_scpi_source_remove(sdi->session, scpi);
	640
	641	packet.type = SR_DF_END;
	642	sr_session_send(sdi, &packet);
	643
	644	return SR_OK;
	645	}
	646
	647	SR_PRIV struct sr_dev_driver scpi_pps_driver_info = {
	648	.name = "scpi-pps",
	649	.longname = "SCPI PPS",
	650	.api_version = 1,
	651	.init = init,
	652	.cleanup = cleanup,
	653	.scan = scan,
	654	.dev_list = dev_list,
	655	.dev_clear = dev_clear,
	656	.config_get = config_get,
	657	.config_set = config_set,
	658	.config_list = config_list,
	659	.dev_open = dev_open,
	660	.dev_close = dev_close,
	661	.dev_acquisition_start = dev_acquisition_start,
	662	.dev_acquisition_stop = dev_acquisition_stop,
	663	.context = NULL,
	664	};