[libsigrok.git] / src / hardware / kecheng-kc-330b / api.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013 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 "protocol.h"

#define USB_CONN "1041.8101"
#define VENDOR "Kecheng"
#define USB_INTERFACE 0

static const uint32_t devopts[] = {
	SR_CONF_SOUNDLEVELMETER,
	SR_CONF_CONTINUOUS,
	SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
	SR_CONF_SAMPLE_INTERVAL | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
	SR_CONF_DATALOG | SR_CONF_GET,
	SR_CONF_SPL_WEIGHT_FREQ | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
	SR_CONF_SPL_WEIGHT_TIME | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
	SR_CONF_DATA_SOURCE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
};

SR_PRIV const uint64_t kecheng_kc_330b_sample_intervals[][2] = {
	{ 1, 8 },
	{ 1, 2 },
	{ 1, 1 },
	{ 2, 1 },
	{ 5, 1 },
	{ 10, 1 },
	{ 60, 1 },
};

static const char *weight_freq[] = {
	"A",
	"C",
};

static const char *weight_time[] = {
	"F",
	"S",
};

static const char *data_sources[] = {
	"Live",
	"Memory",
};

static int scan_kecheng(struct sr_dev_driver *di,
		struct sr_usb_dev_inst *usb, char **model)
{
	struct drv_context *drvc;
	int len, ret;
	unsigned char cmd, buf[32];

	drvc = di->context;
	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
		return SR_ERR;

	cmd = CMD_IDENTIFY;
	ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, &cmd, 1, &len, 5);
	if (ret != 0) {
		libusb_close(usb->devhdl);
		sr_dbg("Failed to send Identify command: %s", libusb_error_name(ret));
		return SR_ERR;
	}

	ret = libusb_bulk_transfer(usb->devhdl, EP_IN, buf, 32, &len, 10);
	if (ret != 0) {
		libusb_close(usb->devhdl);
		sr_dbg("Failed to receive response: %s", libusb_error_name(ret));
		return SR_ERR;
	}

	libusb_close(usb->devhdl);
	usb->devhdl = NULL;

	if (len < 2 || buf[0] != (CMD_IDENTIFY | 0x80) || buf[1] > 30) {
		sr_dbg("Invalid response to Identify command");
		return SR_ERR;
	}

	buf[buf[1] + 2] = '\x0';
	*model = g_strndup((const gchar *)buf + 2, 30);

	return SR_OK;
}

static GSList *scan(struct sr_dev_driver *di, GSList *options)
{
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	GSList *usb_devices, *devices, *l;
	char *model;

	(void)options;

	drvc = di->context;

	devices = NULL;
	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, USB_CONN))) {
		/* We have a list of sr_usb_dev_inst matching the connection
		 * string. Wrap them in sr_dev_inst and we're done. */
		for (l = usb_devices; l; l = l->next) {
			if (scan_kecheng(di, l->data, &model) != SR_OK)
				continue;
			sdi = g_malloc0(sizeof(struct sr_dev_inst));
			sdi->status = SR_ST_INACTIVE;
			sdi->vendor = g_strdup(VENDOR);
			sdi->model = model; /* Already g_strndup()'d. */
			sdi->driver = di;
			sdi->inst_type = SR_INST_USB;
			sdi->conn = l->data;
			sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "SPL");
			devc = g_malloc0(sizeof(struct dev_context));
			sdi->priv = devc;
			devc->limit_samples = 0;
			/* The protocol provides no way to read the current
			 * settings, so we'll enforce these. */
			devc->sample_interval = DEFAULT_SAMPLE_INTERVAL;
			devc->alarm_low = DEFAULT_ALARM_LOW;
			devc->alarm_high = DEFAULT_ALARM_HIGH;
			devc->mqflags = DEFAULT_WEIGHT_TIME | DEFAULT_WEIGHT_FREQ;
			devc->data_source = DEFAULT_DATA_SOURCE;
			devc->config_dirty = FALSE;

			/* TODO: Set date/time? */

			drvc->instances = g_slist_append(drvc->instances, sdi);
			devices = g_slist_append(devices, sdi);
		}
		g_slist_free(usb_devices);
	} else
		g_slist_free_full(usb_devices, g_free);

	return devices;
}

static int dev_open(struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di = sdi->driver;
	struct drv_context *drvc = di->context;
	struct sr_usb_dev_inst *usb;
	int ret;

	usb = sdi->conn;

	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
		return SR_ERR;

	if ((ret = libusb_set_configuration(usb->devhdl, 1))) {
		sr_err("Failed to set configuration: %s.", libusb_error_name(ret));
		return SR_ERR;
	}

	if ((ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE))) {
		sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
		return SR_ERR;
	}
	sdi->status = SR_ST_ACTIVE;

	return ret;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct sr_usb_dev_inst *usb;

	usb = sdi->conn;

	if (!usb->devhdl)
		/*  Nothing to do. */
		return SR_OK;

	/* This allows a frontend to configure the device without ever
	 * doing an acquisition step. */
	devc = sdi->priv;
	if (!devc->config_dirty)
		kecheng_kc_330b_configure(sdi);

	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	libusb_close(usb->devhdl);
	usb->devhdl = NULL;
	sdi->status = SR_ST_INACTIVE;

	return SR_OK;
}

static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc;
	GVariant *rational[2];
	const uint64_t *si;

	(void)cg;

	devc = sdi->priv;
	switch (key) {
	case SR_CONF_LIMIT_SAMPLES:
		*data = g_variant_new_uint64(devc->limit_samples);
		break;
	case SR_CONF_SAMPLE_INTERVAL:
		si = kecheng_kc_330b_sample_intervals[devc->sample_interval];
		rational[0] = g_variant_new_uint64(si[0]);
		rational[1] = g_variant_new_uint64(si[1]);
		*data = g_variant_new_tuple(rational, 2);
		break;
	case SR_CONF_DATALOG:
		/* There really isn't a way to be sure the device is logging. */
		return SR_ERR_NA;
		break;
	case SR_CONF_SPL_WEIGHT_FREQ:
		if (devc->mqflags & SR_MQFLAG_SPL_FREQ_WEIGHT_A)
			*data = g_variant_new_string("A");
		else
			*data = g_variant_new_string("C");
		break;
	case SR_CONF_SPL_WEIGHT_TIME:
		if (devc->mqflags & SR_MQFLAG_SPL_TIME_WEIGHT_F)
			*data = g_variant_new_string("F");
		else
			*data = g_variant_new_string("S");
		break;
	case SR_CONF_DATA_SOURCE:
		if (devc->data_source == DATA_SOURCE_LIVE)
			*data = g_variant_new_string("Live");
		else
			*data = g_variant_new_string("Memory");
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

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 p, q;
	unsigned int i;
	int tmp, ret;
	const char *tmp_str;

	(void)cg;

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

	devc = sdi->priv;
	ret = SR_OK;
	switch (key) {
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		sr_dbg("Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	case SR_CONF_SAMPLE_INTERVAL:
		g_variant_get(data, "(tt)", &p, &q);
		for (i = 0; i < ARRAY_SIZE(kecheng_kc_330b_sample_intervals); i++) {
			if (kecheng_kc_330b_sample_intervals[i][0] != p || kecheng_kc_330b_sample_intervals[i][1] != q)
				continue;
			devc->sample_interval = i;
			devc->config_dirty = TRUE;
			break;
		}
		if (i == ARRAY_SIZE(kecheng_kc_330b_sample_intervals))
			ret = SR_ERR_ARG;
		break;
	case SR_CONF_SPL_WEIGHT_FREQ:
		tmp_str = g_variant_get_string(data, NULL);
		if (!strcmp(tmp_str, "A"))
			tmp = SR_MQFLAG_SPL_FREQ_WEIGHT_A;
		else if (!strcmp(tmp_str, "C"))
			tmp = SR_MQFLAG_SPL_FREQ_WEIGHT_C;
		else
			return SR_ERR_ARG;
		devc->mqflags &= ~(SR_MQFLAG_SPL_FREQ_WEIGHT_A | SR_MQFLAG_SPL_FREQ_WEIGHT_C);
		devc->mqflags |= tmp;
		devc->config_dirty = TRUE;
		break;
	case SR_CONF_SPL_WEIGHT_TIME:
		tmp_str = g_variant_get_string(data, NULL);
		if (!strcmp(tmp_str, "F"))
			tmp = SR_MQFLAG_SPL_TIME_WEIGHT_F;
		else if (!strcmp(tmp_str, "S"))
			tmp = SR_MQFLAG_SPL_TIME_WEIGHT_S;
		else
			return SR_ERR_ARG;
		devc->mqflags &= ~(SR_MQFLAG_SPL_TIME_WEIGHT_F | SR_MQFLAG_SPL_TIME_WEIGHT_S);
		devc->mqflags |= tmp;
		devc->config_dirty = TRUE;
		break;
	case SR_CONF_DATA_SOURCE:
		tmp_str = g_variant_get_string(data, NULL);
		if (!strcmp(tmp_str, "Live"))
			devc->data_source = DATA_SOURCE_LIVE;
		else if (!strcmp(tmp_str, "Memory"))
			devc->data_source = DATA_SOURCE_MEMORY;
		else
			return SR_ERR;
		devc->config_dirty = TRUE;
		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)
{
	GVariant *tuple, *rational[2];
	GVariantBuilder gvb;
	unsigned int i;

	(void)sdi;
	(void)cg;

	switch (key) {
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
				devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
		break;
	case SR_CONF_SAMPLE_INTERVAL:
		g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
		for (i = 0; i < ARRAY_SIZE(kecheng_kc_330b_sample_intervals); i++) {
			rational[0] = g_variant_new_uint64(kecheng_kc_330b_sample_intervals[i][0]);
			rational[1] = g_variant_new_uint64(kecheng_kc_330b_sample_intervals[i][1]);
			tuple = g_variant_new_tuple(rational, 2);
			g_variant_builder_add_value(&gvb, tuple);
		}
		*data = g_variant_builder_end(&gvb);
		break;
	case SR_CONF_SPL_WEIGHT_FREQ:
		*data = g_variant_new_strv(weight_freq, ARRAY_SIZE(weight_freq));
		break;
	case SR_CONF_SPL_WEIGHT_TIME:
		*data = g_variant_new_strv(weight_time, ARRAY_SIZE(weight_time));
		break;
	case SR_CONF_DATA_SOURCE:
		*data = g_variant_new_strv(data_sources, ARRAY_SIZE(data_sources));
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int dev_acquisition_start(const struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di = sdi->driver;
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_meta meta;
	struct sr_config *src;
	struct sr_usb_dev_inst *usb;
	GVariant *gvar, *rational[2];
	const uint64_t *si;
	int req_len, buf_len, len, ret;
	unsigned char buf[9];

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

	drvc = di->context;
	devc = sdi->priv;
	usb = sdi->conn;

	devc->num_samples = 0;

	std_session_send_df_header(sdi, LOG_PREFIX);

	if (devc->data_source == DATA_SOURCE_LIVE) {
		/* Force configuration. */
		kecheng_kc_330b_configure(sdi);

		if (kecheng_kc_330b_status_get(sdi, &ret) != SR_OK)
			return SR_ERR;
		if (ret != DEVICE_ACTIVE) {
			sr_err("Device is inactive");
			/* Still continue though, since the device will
			 * just return 30.0 until the user hits the button
			 * on the device -- and then start feeding good
			 * samples back. */
		}
	} else {
		if (kecheng_kc_330b_log_info_get(sdi, buf) != SR_OK)
			return SR_ERR;
		devc->mqflags = buf[4] ? SR_MQFLAG_SPL_TIME_WEIGHT_S : SR_MQFLAG_SPL_TIME_WEIGHT_F;
		devc->mqflags |= buf[5] ? SR_MQFLAG_SPL_FREQ_WEIGHT_C : SR_MQFLAG_SPL_FREQ_WEIGHT_A;
		devc->stored_samples = (buf[7] << 8) | buf[8];
		if (devc->stored_samples == 0) {
			/* Notify frontend of empty log by sending start/end packets. */
			std_session_send_df_end(sdi, LOG_PREFIX);
			return SR_OK;
		}

		if (devc->limit_samples && devc->limit_samples < devc->stored_samples)
			devc->stored_samples = devc->limit_samples;

		si = kecheng_kc_330b_sample_intervals[buf[1]];
		rational[0] = g_variant_new_uint64(si[0]);
		rational[1] = g_variant_new_uint64(si[1]);
		gvar = g_variant_new_tuple(rational, 2);
		src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, gvar);
		packet.type = SR_DF_META;
		packet.payload = &meta;
		meta.config = g_slist_append(NULL, src);
		sr_session_send(sdi, &packet);
		g_free(src);
	}

	if (!(devc->xfer = libusb_alloc_transfer(0)))
		return SR_ERR;

	usb_source_add(sdi->session, drvc->sr_ctx, 10,
		kecheng_kc_330b_handle_events, (void *)sdi);

	if (devc->data_source == DATA_SOURCE_LIVE) {
		buf[0] = CMD_GET_LIVE_SPL;
		buf_len = 1;
		devc->state = LIVE_SPL_WAIT;
		devc->last_live_request = g_get_monotonic_time() / 1000;
		req_len = 3;
	} else {
		buf[0] = CMD_GET_LOG_DATA;
		buf[1] = 0;
		buf[2] = 0;
		buf_len = 4;
		devc->state = LOG_DATA_WAIT;
		if (devc->stored_samples < 63)
			buf[3] = devc->stored_samples;
		else
			buf[3] = 63;
		/* Command ack byte + 2 bytes per sample. */
		req_len = 1 + buf[3] * 2;
	}

	ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, buf, buf_len, &len, 5);
	if (ret != 0 || len != 1) {
		sr_dbg("Failed to start acquisition: %s", libusb_error_name(ret));
		libusb_free_transfer(devc->xfer);
		return SR_ERR;
	}

	libusb_fill_bulk_transfer(devc->xfer, usb->devhdl, EP_IN, devc->buf,
			req_len, kecheng_kc_330b_receive_transfer, (void *)sdi, 15);
	if (libusb_submit_transfer(devc->xfer) != 0) {
		libusb_free_transfer(devc->xfer);
		return SR_ERR;
	}

	return SR_OK;
}

static int dev_acquisition_stop(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

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

	/* Signal USB transfer handler to clean up and stop. */
	sdi->status = SR_ST_STOPPING;

	devc = sdi->priv;
	if (devc->data_source == DATA_SOURCE_MEMORY && devc->config_dirty) {
		/* The protocol doesn't have a command to clear stored data;
		 * it clears it whenever new configuration is set. That means
		 * we can't just configure the device any time we want when
		 * it's in DATA_SOURCE_MEMORY mode. The only safe time to do
		 * it is now, when we're sure we've pulled in all the stored
		 * data. */
		kecheng_kc_330b_configure(sdi);
	}

	return SR_OK;
}

static struct sr_dev_driver kecheng_kc_330b_driver_info = {
	.name = "kecheng-kc-330b",
	.longname = "Kecheng KC-330B",
	.api_version = 1,
	.init = std_init,
	.cleanup = std_cleanup,
	.scan = scan,
	.dev_list = std_dev_list,
	.dev_clear = NULL,
	.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,
};
SR_REGISTER_DEV_DRIVER(kecheng_kc_330b_driver_info);
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2013 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 "protocol.h"
	23
	24	#define USB_CONN "1041.8101"
	25	#define VENDOR "Kecheng"
	26	#define USB_INTERFACE 0
	27
	28	static const uint32_t devopts[] = {
	29	SR_CONF_SOUNDLEVELMETER,
	30	SR_CONF_CONTINUOUS,
	31	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
	32	SR_CONF_SAMPLE_INTERVAL \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
	33	SR_CONF_DATALOG \| SR_CONF_GET,
	34	SR_CONF_SPL_WEIGHT_FREQ \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
	35	SR_CONF_SPL_WEIGHT_TIME \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
	36	SR_CONF_DATA_SOURCE \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
	37	};
	38
	39	SR_PRIV const uint64_t kecheng_kc_330b_sample_intervals[][2] = {
	40	{ 1, 8 },
	41	{ 1, 2 },
	42	{ 1, 1 },
	43	{ 2, 1 },
	44	{ 5, 1 },
	45	{ 10, 1 },
	46	{ 60, 1 },
	47	};
	48
	49	static const char *weight_freq[] = {
	50	"A",
	51	"C",
	52	};
	53
	54	static const char *weight_time[] = {
	55	"F",
	56	"S",
	57	};
	58
	59	static const char *data_sources[] = {
	60	"Live",
	61	"Memory",
	62	};
	63
	64	static int scan_kecheng(struct sr_dev_driver *di,
	65	struct sr_usb_dev_inst usb, char *model)
	66	{
	67	struct drv_context *drvc;
	68	int len, ret;
	69	unsigned char cmd, buf[32];
	70
	71	drvc = di->context;
	72	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
	73	return SR_ERR;
	74
	75	cmd = CMD_IDENTIFY;
	76	ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, &cmd, 1, &len, 5);
	77	if (ret != 0) {
	78	libusb_close(usb->devhdl);
	79	sr_dbg("Failed to send Identify command: %s", libusb_error_name(ret));
	80	return SR_ERR;
	81	}
	82
	83	ret = libusb_bulk_transfer(usb->devhdl, EP_IN, buf, 32, &len, 10);
	84	if (ret != 0) {
	85	libusb_close(usb->devhdl);
	86	sr_dbg("Failed to receive response: %s", libusb_error_name(ret));
	87	return SR_ERR;
	88	}
	89
	90	libusb_close(usb->devhdl);
	91	usb->devhdl = NULL;
	92
	93	if (len < 2 \|\| buf[0] != (CMD_IDENTIFY \| 0x80) \|\| buf[1] > 30) {
	94	sr_dbg("Invalid response to Identify command");
	95	return SR_ERR;
	96	}
	97
	98	buf[buf[1] + 2] = '\x0';
	99	model = g_strndup((const gchar )buf + 2, 30);
	100
	101	return SR_OK;
	102	}
	103
	104	static GSList scan(struct sr_dev_driver di, GSList *options)
	105	{
	106	struct drv_context *drvc;
	107	struct dev_context *devc;
	108	struct sr_dev_inst *sdi;
	109	GSList usb_devices, devices, *l;
	110	char *model;
	111
	112	(void)options;
	113
	114	drvc = di->context;
	115
	116	devices = NULL;
	117	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, USB_CONN))) {
	118	/* We have a list of sr_usb_dev_inst matching the connection
	119	* string. Wrap them in sr_dev_inst and we're done. */
	120	for (l = usb_devices; l; l = l->next) {
	121	if (scan_kecheng(di, l->data, &model) != SR_OK)
	122	continue;
	123	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	124	sdi->status = SR_ST_INACTIVE;
	125	sdi->vendor = g_strdup(VENDOR);
	126	sdi->model = model; /* Already g_strndup()'d. */
	127	sdi->driver = di;
	128	sdi->inst_type = SR_INST_USB;
	129	sdi->conn = l->data;
	130	sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "SPL");
	131	devc = g_malloc0(sizeof(struct dev_context));
	132	sdi->priv = devc;
	133	devc->limit_samples = 0;
	134	/* The protocol provides no way to read the current
	135	* settings, so we'll enforce these. */
	136	devc->sample_interval = DEFAULT_SAMPLE_INTERVAL;
	137	devc->alarm_low = DEFAULT_ALARM_LOW;
	138	devc->alarm_high = DEFAULT_ALARM_HIGH;
	139	devc->mqflags = DEFAULT_WEIGHT_TIME \| DEFAULT_WEIGHT_FREQ;
	140	devc->data_source = DEFAULT_DATA_SOURCE;
	141	devc->config_dirty = FALSE;
	142
	143	/* TODO: Set date/time? */
	144
	145	drvc->instances = g_slist_append(drvc->instances, sdi);
	146	devices = g_slist_append(devices, sdi);
	147	}
	148	g_slist_free(usb_devices);
	149	} else
	150	g_slist_free_full(usb_devices, g_free);
	151
	152	return devices;
	153	}
	154
	155	static int dev_open(struct sr_dev_inst *sdi)
	156	{
	157	struct sr_dev_driver *di = sdi->driver;
	158	struct drv_context *drvc = di->context;
	159	struct sr_usb_dev_inst *usb;
	160	int ret;
	161
	162	usb = sdi->conn;
	163
	164	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
	165	return SR_ERR;
	166
	167	if ((ret = libusb_set_configuration(usb->devhdl, 1))) {
	168	sr_err("Failed to set configuration: %s.", libusb_error_name(ret));
	169	return SR_ERR;
	170	}
	171
	172	if ((ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE))) {
	173	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	174	return SR_ERR;
	175	}
	176	sdi->status = SR_ST_ACTIVE;
	177
	178	return ret;
	179	}
	180
	181	static int dev_close(struct sr_dev_inst *sdi)
	182	{
	183	struct dev_context *devc;
	184	struct sr_usb_dev_inst *usb;
	185
	186	usb = sdi->conn;
	187
	188	if (!usb->devhdl)
	189	/* Nothing to do. */
	190	return SR_OK;
	191
	192	/* This allows a frontend to configure the device without ever
	193	* doing an acquisition step. */
	194	devc = sdi->priv;
	195	if (!devc->config_dirty)
	196	kecheng_kc_330b_configure(sdi);
	197
	198	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	199	libusb_close(usb->devhdl);
	200	usb->devhdl = NULL;
	201	sdi->status = SR_ST_INACTIVE;
	202
	203	return SR_OK;
	204	}
	205
	206	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	207	const struct sr_channel_group *cg)
	208	{
	209	struct dev_context *devc;
	210	GVariant *rational[2];
	211	const uint64_t *si;
	212
	213	(void)cg;
	214
	215	devc = sdi->priv;
	216	switch (key) {
	217	case SR_CONF_LIMIT_SAMPLES:
	218	*data = g_variant_new_uint64(devc->limit_samples);
	219	break;
	220	case SR_CONF_SAMPLE_INTERVAL:
	221	si = kecheng_kc_330b_sample_intervals[devc->sample_interval];
	222	rational[0] = g_variant_new_uint64(si[0]);
	223	rational[1] = g_variant_new_uint64(si[1]);
	224	*data = g_variant_new_tuple(rational, 2);
	225	break;
	226	case SR_CONF_DATALOG:
	227	/* There really isn't a way to be sure the device is logging. */
	228	return SR_ERR_NA;
	229	break;
	230	case SR_CONF_SPL_WEIGHT_FREQ:
	231	if (devc->mqflags & SR_MQFLAG_SPL_FREQ_WEIGHT_A)
	232	*data = g_variant_new_string("A");
	233	else
	234	*data = g_variant_new_string("C");
	235	break;
	236	case SR_CONF_SPL_WEIGHT_TIME:
	237	if (devc->mqflags & SR_MQFLAG_SPL_TIME_WEIGHT_F)
	238	*data = g_variant_new_string("F");
	239	else
	240	*data = g_variant_new_string("S");
	241	break;
	242	case SR_CONF_DATA_SOURCE:
	243	if (devc->data_source == DATA_SOURCE_LIVE)
	244	*data = g_variant_new_string("Live");
	245	else
	246	*data = g_variant_new_string("Memory");
	247	break;
	248	default:
	249	return SR_ERR_NA;
	250	}
	251
	252	return SR_OK;
	253	}
	254
	255	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
	256	const struct sr_channel_group *cg)
	257	{
	258	struct dev_context *devc;
	259	uint64_t p, q;
	260	unsigned int i;
	261	int tmp, ret;
	262	const char *tmp_str;
	263
	264	(void)cg;
	265
	266	if (sdi->status != SR_ST_ACTIVE)
	267	return SR_ERR_DEV_CLOSED;
	268
	269	devc = sdi->priv;
	270	ret = SR_OK;
	271	switch (key) {
	272	case SR_CONF_LIMIT_SAMPLES:
	273	devc->limit_samples = g_variant_get_uint64(data);
	274	sr_dbg("Setting sample limit to %" PRIu64 ".",
	275	devc->limit_samples);
	276	break;
	277	case SR_CONF_SAMPLE_INTERVAL:
	278	g_variant_get(data, "(tt)", &p, &q);
	279	for (i = 0; i < ARRAY_SIZE(kecheng_kc_330b_sample_intervals); i++) {
	280	if (kecheng_kc_330b_sample_intervals[i][0] != p \|\| kecheng_kc_330b_sample_intervals[i][1] != q)
	281	continue;
	282	devc->sample_interval = i;
	283	devc->config_dirty = TRUE;
	284	break;
	285	}
	286	if (i == ARRAY_SIZE(kecheng_kc_330b_sample_intervals))
	287	ret = SR_ERR_ARG;
	288	break;
	289	case SR_CONF_SPL_WEIGHT_FREQ:
	290	tmp_str = g_variant_get_string(data, NULL);
	291	if (!strcmp(tmp_str, "A"))
	292	tmp = SR_MQFLAG_SPL_FREQ_WEIGHT_A;
	293	else if (!strcmp(tmp_str, "C"))
	294	tmp = SR_MQFLAG_SPL_FREQ_WEIGHT_C;
	295	else
	296	return SR_ERR_ARG;
	297	devc->mqflags &= ~(SR_MQFLAG_SPL_FREQ_WEIGHT_A \| SR_MQFLAG_SPL_FREQ_WEIGHT_C);
	298	devc->mqflags \|= tmp;
	299	devc->config_dirty = TRUE;
	300	break;
	301	case SR_CONF_SPL_WEIGHT_TIME:
	302	tmp_str = g_variant_get_string(data, NULL);
	303	if (!strcmp(tmp_str, "F"))
	304	tmp = SR_MQFLAG_SPL_TIME_WEIGHT_F;
	305	else if (!strcmp(tmp_str, "S"))
	306	tmp = SR_MQFLAG_SPL_TIME_WEIGHT_S;
	307	else
	308	return SR_ERR_ARG;
	309	devc->mqflags &= ~(SR_MQFLAG_SPL_TIME_WEIGHT_F \| SR_MQFLAG_SPL_TIME_WEIGHT_S);
	310	devc->mqflags \|= tmp;
	311	devc->config_dirty = TRUE;
	312	break;
	313	case SR_CONF_DATA_SOURCE:
	314	tmp_str = g_variant_get_string(data, NULL);
	315	if (!strcmp(tmp_str, "Live"))
	316	devc->data_source = DATA_SOURCE_LIVE;
	317	else if (!strcmp(tmp_str, "Memory"))
	318	devc->data_source = DATA_SOURCE_MEMORY;
	319	else
	320	return SR_ERR;
	321	devc->config_dirty = TRUE;
	322	break;
	323	default:
	324	ret = SR_ERR_NA;
	325	}
	326
	327	return ret;
	328	}
	329
	330	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	331	const struct sr_channel_group *cg)
	332	{
	333	GVariant tuple, rational[2];
	334	GVariantBuilder gvb;
	335	unsigned int i;
	336
	337	(void)sdi;
	338	(void)cg;
	339
	340	switch (key) {
	341	case SR_CONF_DEVICE_OPTIONS:
	342	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	343	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
	344	break;
	345	case SR_CONF_SAMPLE_INTERVAL:
	346	g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
	347	for (i = 0; i < ARRAY_SIZE(kecheng_kc_330b_sample_intervals); i++) {
	348	rational[0] = g_variant_new_uint64(kecheng_kc_330b_sample_intervals[i][0]);
	349	rational[1] = g_variant_new_uint64(kecheng_kc_330b_sample_intervals[i][1]);
	350	tuple = g_variant_new_tuple(rational, 2);
	351	g_variant_builder_add_value(&gvb, tuple);
	352	}
	353	*data = g_variant_builder_end(&gvb);
	354	break;
	355	case SR_CONF_SPL_WEIGHT_FREQ:
	356	*data = g_variant_new_strv(weight_freq, ARRAY_SIZE(weight_freq));
	357	break;
	358	case SR_CONF_SPL_WEIGHT_TIME:
	359	*data = g_variant_new_strv(weight_time, ARRAY_SIZE(weight_time));
	360	break;
	361	case SR_CONF_DATA_SOURCE:
	362	*data = g_variant_new_strv(data_sources, ARRAY_SIZE(data_sources));
	363	break;
	364	default:
	365	return SR_ERR_NA;
	366	}
	367
	368	return SR_OK;
	369	}
	370
	371	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	372	{
	373	struct sr_dev_driver *di = sdi->driver;
	374	struct drv_context *drvc;
	375	struct dev_context *devc;
	376	struct sr_datafeed_packet packet;
	377	struct sr_datafeed_meta meta;
	378	struct sr_config *src;
	379	struct sr_usb_dev_inst *usb;
	380	GVariant gvar, rational[2];
	381	const uint64_t *si;
	382	int req_len, buf_len, len, ret;
	383	unsigned char buf[9];
	384
	385	if (sdi->status != SR_ST_ACTIVE)
	386	return SR_ERR_DEV_CLOSED;
	387
	388	drvc = di->context;
	389	devc = sdi->priv;
	390	usb = sdi->conn;
	391
	392	devc->num_samples = 0;
	393
	394	std_session_send_df_header(sdi, LOG_PREFIX);
	395
	396	if (devc->data_source == DATA_SOURCE_LIVE) {
	397	/* Force configuration. */
	398	kecheng_kc_330b_configure(sdi);
	399
	400	if (kecheng_kc_330b_status_get(sdi, &ret) != SR_OK)
	401	return SR_ERR;
	402	if (ret != DEVICE_ACTIVE) {
	403	sr_err("Device is inactive");
	404	/* Still continue though, since the device will
	405	* just return 30.0 until the user hits the button
	406	* on the device -- and then start feeding good
	407	* samples back. */
	408	}
	409	} else {
	410	if (kecheng_kc_330b_log_info_get(sdi, buf) != SR_OK)
	411	return SR_ERR;
	412	devc->mqflags = buf[4] ? SR_MQFLAG_SPL_TIME_WEIGHT_S : SR_MQFLAG_SPL_TIME_WEIGHT_F;
	413	devc->mqflags \|= buf[5] ? SR_MQFLAG_SPL_FREQ_WEIGHT_C : SR_MQFLAG_SPL_FREQ_WEIGHT_A;
	414	devc->stored_samples = (buf[7] << 8) \| buf[8];
	415	if (devc->stored_samples == 0) {
	416	/* Notify frontend of empty log by sending start/end packets. */
	417	std_session_send_df_end(sdi, LOG_PREFIX);
	418	return SR_OK;
	419	}
	420
	421	if (devc->limit_samples && devc->limit_samples < devc->stored_samples)
	422	devc->stored_samples = devc->limit_samples;
	423
	424	si = kecheng_kc_330b_sample_intervals[buf[1]];
	425	rational[0] = g_variant_new_uint64(si[0]);
	426	rational[1] = g_variant_new_uint64(si[1]);
	427	gvar = g_variant_new_tuple(rational, 2);
	428	src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, gvar);
	429	packet.type = SR_DF_META;
	430	packet.payload = &meta;
	431	meta.config = g_slist_append(NULL, src);
	432	sr_session_send(sdi, &packet);
	433	g_free(src);
	434	}
	435
	436	if (!(devc->xfer = libusb_alloc_transfer(0)))
	437	return SR_ERR;
	438
	439	usb_source_add(sdi->session, drvc->sr_ctx, 10,
	440	kecheng_kc_330b_handle_events, (void *)sdi);
	441
	442	if (devc->data_source == DATA_SOURCE_LIVE) {
	443	buf[0] = CMD_GET_LIVE_SPL;
	444	buf_len = 1;
	445	devc->state = LIVE_SPL_WAIT;
	446	devc->last_live_request = g_get_monotonic_time() / 1000;
	447	req_len = 3;
	448	} else {
	449	buf[0] = CMD_GET_LOG_DATA;
	450	buf[1] = 0;
	451	buf[2] = 0;
	452	buf_len = 4;
	453	devc->state = LOG_DATA_WAIT;
	454	if (devc->stored_samples < 63)
	455	buf[3] = devc->stored_samples;
	456	else
	457	buf[3] = 63;
	458	/* Command ack byte + 2 bytes per sample. */
	459	req_len = 1 + buf[3] * 2;
	460	}
	461
	462	ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, buf, buf_len, &len, 5);
	463	if (ret != 0 \|\| len != 1) {
	464	sr_dbg("Failed to start acquisition: %s", libusb_error_name(ret));
	465	libusb_free_transfer(devc->xfer);
	466	return SR_ERR;
	467	}
	468
	469	libusb_fill_bulk_transfer(devc->xfer, usb->devhdl, EP_IN, devc->buf,
	470	req_len, kecheng_kc_330b_receive_transfer, (void *)sdi, 15);
	471	if (libusb_submit_transfer(devc->xfer) != 0) {
	472	libusb_free_transfer(devc->xfer);
	473	return SR_ERR;
	474	}
	475
	476	return SR_OK;
	477	}
	478
	479	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	480	{
	481	struct dev_context *devc;
	482
	483	if (sdi->status != SR_ST_ACTIVE)
	484	return SR_ERR_DEV_CLOSED;
	485
	486	/* Signal USB transfer handler to clean up and stop. */
	487	sdi->status = SR_ST_STOPPING;
	488
	489	devc = sdi->priv;
	490	if (devc->data_source == DATA_SOURCE_MEMORY && devc->config_dirty) {
	491	/* The protocol doesn't have a command to clear stored data;
	492	* it clears it whenever new configuration is set. That means
	493	* we can't just configure the device any time we want when
	494	* it's in DATA_SOURCE_MEMORY mode. The only safe time to do
	495	* it is now, when we're sure we've pulled in all the stored
	496	* data. */
	497	kecheng_kc_330b_configure(sdi);
	498	}
	499
	500	return SR_OK;
	501	}
	502
	503	static struct sr_dev_driver kecheng_kc_330b_driver_info = {
	504	.name = "kecheng-kc-330b",
	505	.longname = "Kecheng KC-330B",
	506	.api_version = 1,
	507	.init = std_init,
	508	.cleanup = std_cleanup,
	509	.scan = scan,
	510	.dev_list = std_dev_list,
	511	.dev_clear = NULL,
	512	.config_get = config_get,
	513	.config_set = config_set,
	514	.config_list = config_list,
	515	.dev_open = dev_open,
	516	.dev_close = dev_close,
	517	.dev_acquisition_start = dev_acquisition_start,
	518	.dev_acquisition_stop = dev_acquisition_stop,
	519	.context = NULL,
	520	};
	521	SR_REGISTER_DEV_DRIVER(kecheng_kc_330b_driver_info);