[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",
};

SR_PRIV struct sr_dev_driver kecheng_kc_330b_driver_info;

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

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;
	drvc->instances = NULL;

	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 GSList *dev_list(const struct sr_dev_driver *di)
{
	return ((struct drv_context *)(di->context))->instances;
}

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

	if (!(drvc = di->context)) {
		sr_err("Driver was not initialized.");
		return SR_ERR;
	}

	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 sr_dev_driver *di = sdi->driver;
	struct dev_context *devc;
	struct sr_usb_dev_inst *usb;

	if (!di->context) {
		sr_err("Driver was not initialized.");
		return SR_ERR;
	}

	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 sr_dev_driver *di = sdi->driver;
	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;

	if (!di->context) {
		sr_err("Driver was not initialized.");
		return SR_ERR;
	}

	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;
}

SR_PRIV struct sr_dev_driver kecheng_kc_330b_driver_info = {
	.name = "kecheng-kc-330b",
	.longname = "Kecheng KC-330B",
	.api_version = 1,
	.init = init,
	.cleanup = std_cleanup,
	.scan = scan,
	.dev_list = 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,
};
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	SR_PRIV struct sr_dev_driver kecheng_kc_330b_driver_info;
	65
	66	static int init(struct sr_dev_driver di, struct sr_context sr_ctx)
	67	{
	68	return std_init(sr_ctx, di, LOG_PREFIX);
	69	}
	70
	71	static int scan_kecheng(struct sr_dev_driver *di,
	72	struct sr_usb_dev_inst usb, char *model)
	73	{
	74	struct drv_context *drvc;
	75	int len, ret;
	76	unsigned char cmd, buf[32];
	77
	78	drvc = di->context;
	79	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
	80	return SR_ERR;
	81
	82	cmd = CMD_IDENTIFY;
	83	ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, &cmd, 1, &len, 5);
	84	if (ret != 0) {
	85	libusb_close(usb->devhdl);
	86	sr_dbg("Failed to send Identify command: %s", libusb_error_name(ret));
	87	return SR_ERR;
	88	}
	89
	90	ret = libusb_bulk_transfer(usb->devhdl, EP_IN, buf, 32, &len, 10);
	91	if (ret != 0) {
	92	libusb_close(usb->devhdl);
	93	sr_dbg("Failed to receive response: %s", libusb_error_name(ret));
	94	return SR_ERR;
	95	}
	96
	97	libusb_close(usb->devhdl);
	98	usb->devhdl = NULL;
	99
	100	if (len < 2 \|\| buf[0] != (CMD_IDENTIFY \| 0x80) \|\| buf[1] > 30) {
	101	sr_dbg("Invalid response to Identify command");
	102	return SR_ERR;
	103	}
	104
	105	buf[buf[1] + 2] = '\x0';
	106	model = g_strndup((const gchar )buf + 2, 30);
	107
	108	return SR_OK;
	109	}
	110
	111	static GSList scan(struct sr_dev_driver di, GSList *options)
	112	{
	113	struct drv_context *drvc;
	114	struct dev_context *devc;
	115	struct sr_dev_inst *sdi;
	116	GSList usb_devices, devices, *l;
	117	char *model;
	118
	119	(void)options;
	120
	121	drvc = di->context;
	122	drvc->instances = NULL;
	123
	124	devices = NULL;
	125	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, USB_CONN))) {
	126	/* We have a list of sr_usb_dev_inst matching the connection
	127	* string. Wrap them in sr_dev_inst and we're done. */
	128	for (l = usb_devices; l; l = l->next) {
	129	if (scan_kecheng(di, l->data, &model) != SR_OK)
	130	continue;
	131	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	132	sdi->status = SR_ST_INACTIVE;
	133	sdi->vendor = g_strdup(VENDOR);
	134	sdi->model = model; /* Already g_strndup()'d. */
	135	sdi->driver = di;
	136	sdi->inst_type = SR_INST_USB;
	137	sdi->conn = l->data;
	138	sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "SPL");
	139	devc = g_malloc0(sizeof(struct dev_context));
	140	sdi->priv = devc;
	141	devc->limit_samples = 0;
	142	/* The protocol provides no way to read the current
	143	* settings, so we'll enforce these. */
	144	devc->sample_interval = DEFAULT_SAMPLE_INTERVAL;
	145	devc->alarm_low = DEFAULT_ALARM_LOW;
	146	devc->alarm_high = DEFAULT_ALARM_HIGH;
	147	devc->mqflags = DEFAULT_WEIGHT_TIME \| DEFAULT_WEIGHT_FREQ;
	148	devc->data_source = DEFAULT_DATA_SOURCE;
	149	devc->config_dirty = FALSE;
	150
	151	/* TODO: Set date/time? */
	152
	153	drvc->instances = g_slist_append(drvc->instances, sdi);
	154	devices = g_slist_append(devices, sdi);
	155	}
	156	g_slist_free(usb_devices);
	157	} else
	158	g_slist_free_full(usb_devices, g_free);
	159
	160	return devices;
	161	}
	162
	163	static GSList dev_list(const struct sr_dev_driver di)
	164	{
	165	return ((struct drv_context *)(di->context))->instances;
	166	}
	167
	168	static int dev_open(struct sr_dev_inst *sdi)
	169	{
	170	struct sr_dev_driver *di = sdi->driver;
	171	struct drv_context *drvc;
	172	struct sr_usb_dev_inst *usb;
	173	int ret;
	174
	175	if (!(drvc = di->context)) {
	176	sr_err("Driver was not initialized.");
	177	return SR_ERR;
	178	}
	179
	180	usb = sdi->conn;
	181
	182	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
	183	return SR_ERR;
	184
	185	if ((ret = libusb_set_configuration(usb->devhdl, 1))) {
	186	sr_err("Failed to set configuration: %s.", libusb_error_name(ret));
	187	return SR_ERR;
	188	}
	189
	190	if ((ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE))) {
	191	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	192	return SR_ERR;
	193	}
	194	sdi->status = SR_ST_ACTIVE;
	195
	196	return ret;
	197	}
	198
	199	static int dev_close(struct sr_dev_inst *sdi)
	200	{
	201	struct sr_dev_driver *di = sdi->driver;
	202	struct dev_context *devc;
	203	struct sr_usb_dev_inst *usb;
	204
	205	if (!di->context) {
	206	sr_err("Driver was not initialized.");
	207	return SR_ERR;
	208	}
	209
	210	usb = sdi->conn;
	211
	212	if (!usb->devhdl)
	213	/* Nothing to do. */
	214	return SR_OK;
	215
	216	/* This allows a frontend to configure the device without ever
	217	* doing an acquisition step. */
	218	devc = sdi->priv;
	219	if (!devc->config_dirty)
	220	kecheng_kc_330b_configure(sdi);
	221
	222	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	223	libusb_close(usb->devhdl);
	224	usb->devhdl = NULL;
	225	sdi->status = SR_ST_INACTIVE;
	226
	227	return SR_OK;
	228	}
	229
	230	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	231	const struct sr_channel_group *cg)
	232	{
	233	struct dev_context *devc;
	234	GVariant *rational[2];
	235	const uint64_t *si;
	236
	237	(void)cg;
	238
	239	devc = sdi->priv;
	240	switch (key) {
	241	case SR_CONF_LIMIT_SAMPLES:
	242	*data = g_variant_new_uint64(devc->limit_samples);
	243	break;
	244	case SR_CONF_SAMPLE_INTERVAL:
	245	si = kecheng_kc_330b_sample_intervals[devc->sample_interval];
	246	rational[0] = g_variant_new_uint64(si[0]);
	247	rational[1] = g_variant_new_uint64(si[1]);
	248	*data = g_variant_new_tuple(rational, 2);
	249	break;
	250	case SR_CONF_DATALOG:
	251	/* There really isn't a way to be sure the device is logging. */
	252	return SR_ERR_NA;
	253	break;
	254	case SR_CONF_SPL_WEIGHT_FREQ:
	255	if (devc->mqflags & SR_MQFLAG_SPL_FREQ_WEIGHT_A)
	256	*data = g_variant_new_string("A");
	257	else
	258	*data = g_variant_new_string("C");
	259	break;
	260	case SR_CONF_SPL_WEIGHT_TIME:
	261	if (devc->mqflags & SR_MQFLAG_SPL_TIME_WEIGHT_F)
	262	*data = g_variant_new_string("F");
	263	else
	264	*data = g_variant_new_string("S");
	265	break;
	266	case SR_CONF_DATA_SOURCE:
	267	if (devc->data_source == DATA_SOURCE_LIVE)
	268	*data = g_variant_new_string("Live");
	269	else
	270	*data = g_variant_new_string("Memory");
	271	break;
	272	default:
	273	return SR_ERR_NA;
	274	}
	275
	276	return SR_OK;
	277	}
	278
	279	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
	280	const struct sr_channel_group *cg)
	281	{
	282	struct sr_dev_driver *di = sdi->driver;
	283	struct dev_context *devc;
	284	uint64_t p, q;
	285	unsigned int i;
	286	int tmp, ret;
	287	const char *tmp_str;
	288
	289	(void)cg;
	290
	291	if (sdi->status != SR_ST_ACTIVE)
	292	return SR_ERR_DEV_CLOSED;
	293
	294	if (!di->context) {
	295	sr_err("Driver was not initialized.");
	296	return SR_ERR;
	297	}
	298
	299	devc = sdi->priv;
	300	ret = SR_OK;
	301	switch (key) {
	302	case SR_CONF_LIMIT_SAMPLES:
	303	devc->limit_samples = g_variant_get_uint64(data);
	304	sr_dbg("Setting sample limit to %" PRIu64 ".",
	305	devc->limit_samples);
	306	break;
	307	case SR_CONF_SAMPLE_INTERVAL:
	308	g_variant_get(data, "(tt)", &p, &q);
	309	for (i = 0; i < ARRAY_SIZE(kecheng_kc_330b_sample_intervals); i++) {
	310	if (kecheng_kc_330b_sample_intervals[i][0] != p \|\| kecheng_kc_330b_sample_intervals[i][1] != q)
	311	continue;
	312	devc->sample_interval = i;
	313	devc->config_dirty = TRUE;
	314	break;
	315	}
	316	if (i == ARRAY_SIZE(kecheng_kc_330b_sample_intervals))
	317	ret = SR_ERR_ARG;
	318	break;
	319	case SR_CONF_SPL_WEIGHT_FREQ:
	320	tmp_str = g_variant_get_string(data, NULL);
	321	if (!strcmp(tmp_str, "A"))
	322	tmp = SR_MQFLAG_SPL_FREQ_WEIGHT_A;
	323	else if (!strcmp(tmp_str, "C"))
	324	tmp = SR_MQFLAG_SPL_FREQ_WEIGHT_C;
	325	else
	326	return SR_ERR_ARG;
	327	devc->mqflags &= ~(SR_MQFLAG_SPL_FREQ_WEIGHT_A \| SR_MQFLAG_SPL_FREQ_WEIGHT_C);
	328	devc->mqflags \|= tmp;
	329	devc->config_dirty = TRUE;
	330	break;
	331	case SR_CONF_SPL_WEIGHT_TIME:
	332	tmp_str = g_variant_get_string(data, NULL);
	333	if (!strcmp(tmp_str, "F"))
	334	tmp = SR_MQFLAG_SPL_TIME_WEIGHT_F;
	335	else if (!strcmp(tmp_str, "S"))
	336	tmp = SR_MQFLAG_SPL_TIME_WEIGHT_S;
	337	else
	338	return SR_ERR_ARG;
	339	devc->mqflags &= ~(SR_MQFLAG_SPL_TIME_WEIGHT_F \| SR_MQFLAG_SPL_TIME_WEIGHT_S);
	340	devc->mqflags \|= tmp;
	341	devc->config_dirty = TRUE;
	342	break;
	343	case SR_CONF_DATA_SOURCE:
	344	tmp_str = g_variant_get_string(data, NULL);
	345	if (!strcmp(tmp_str, "Live"))
	346	devc->data_source = DATA_SOURCE_LIVE;
	347	else if (!strcmp(tmp_str, "Memory"))
	348	devc->data_source = DATA_SOURCE_MEMORY;
	349	else
	350	return SR_ERR;
	351	devc->config_dirty = TRUE;
	352	break;
	353	default:
	354	ret = SR_ERR_NA;
	355	}
	356
	357	return ret;
	358	}
	359
	360	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	361	const struct sr_channel_group *cg)
	362	{
	363	GVariant tuple, rational[2];
	364	GVariantBuilder gvb;
	365	unsigned int i;
	366
	367	(void)sdi;
	368	(void)cg;
	369
	370	switch (key) {
	371	case SR_CONF_DEVICE_OPTIONS:
	372	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	373	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
	374	break;
	375	case SR_CONF_SAMPLE_INTERVAL:
	376	g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
	377	for (i = 0; i < ARRAY_SIZE(kecheng_kc_330b_sample_intervals); i++) {
	378	rational[0] = g_variant_new_uint64(kecheng_kc_330b_sample_intervals[i][0]);
	379	rational[1] = g_variant_new_uint64(kecheng_kc_330b_sample_intervals[i][1]);
	380	tuple = g_variant_new_tuple(rational, 2);
	381	g_variant_builder_add_value(&gvb, tuple);
	382	}
	383	*data = g_variant_builder_end(&gvb);
	384	break;
	385	case SR_CONF_SPL_WEIGHT_FREQ:
	386	*data = g_variant_new_strv(weight_freq, ARRAY_SIZE(weight_freq));
	387	break;
	388	case SR_CONF_SPL_WEIGHT_TIME:
	389	*data = g_variant_new_strv(weight_time, ARRAY_SIZE(weight_time));
	390	break;
	391	case SR_CONF_DATA_SOURCE:
	392	*data = g_variant_new_strv(data_sources, ARRAY_SIZE(data_sources));
	393	break;
	394	default:
	395	return SR_ERR_NA;
	396	}
	397
	398	return SR_OK;
	399	}
	400
	401	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	402	{
	403	struct sr_dev_driver *di = sdi->driver;
	404	struct drv_context *drvc;
	405	struct dev_context *devc;
	406	struct sr_datafeed_packet packet;
	407	struct sr_datafeed_meta meta;
	408	struct sr_config *src;
	409	struct sr_usb_dev_inst *usb;
	410	GVariant gvar, rational[2];
	411	const uint64_t *si;
	412	int req_len, buf_len, len, ret;
	413	unsigned char buf[9];
	414
	415	if (sdi->status != SR_ST_ACTIVE)
	416	return SR_ERR_DEV_CLOSED;
	417
	418	drvc = di->context;
	419	devc = sdi->priv;
	420	usb = sdi->conn;
	421
	422	devc->num_samples = 0;
	423
	424	std_session_send_df_header(sdi, LOG_PREFIX);
	425
	426	if (devc->data_source == DATA_SOURCE_LIVE) {
	427	/* Force configuration. */
	428	kecheng_kc_330b_configure(sdi);
	429
	430	if (kecheng_kc_330b_status_get(sdi, &ret) != SR_OK)
	431	return SR_ERR;
	432	if (ret != DEVICE_ACTIVE) {
	433	sr_err("Device is inactive");
	434	/* Still continue though, since the device will
	435	* just return 30.0 until the user hits the button
	436	* on the device -- and then start feeding good
	437	* samples back. */
	438	}
	439	} else {
	440	if (kecheng_kc_330b_log_info_get(sdi, buf) != SR_OK)
	441	return SR_ERR;
	442	devc->mqflags = buf[4] ? SR_MQFLAG_SPL_TIME_WEIGHT_S : SR_MQFLAG_SPL_TIME_WEIGHT_F;
	443	devc->mqflags \|= buf[5] ? SR_MQFLAG_SPL_FREQ_WEIGHT_C : SR_MQFLAG_SPL_FREQ_WEIGHT_A;
	444	devc->stored_samples = (buf[7] << 8) \| buf[8];
	445	if (devc->stored_samples == 0) {
	446	/* Notify frontend of empty log by sending start/end packets. */
	447	std_session_send_df_end(sdi, LOG_PREFIX);
	448	return SR_OK;
	449	}
	450
	451	if (devc->limit_samples && devc->limit_samples < devc->stored_samples)
	452	devc->stored_samples = devc->limit_samples;
	453
	454	si = kecheng_kc_330b_sample_intervals[buf[1]];
	455	rational[0] = g_variant_new_uint64(si[0]);
	456	rational[1] = g_variant_new_uint64(si[1]);
	457	gvar = g_variant_new_tuple(rational, 2);
	458	src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, gvar);
	459	packet.type = SR_DF_META;
	460	packet.payload = &meta;
	461	meta.config = g_slist_append(NULL, src);
	462	sr_session_send(sdi, &packet);
	463	g_free(src);
	464	}
	465
	466	if (!(devc->xfer = libusb_alloc_transfer(0)))
	467	return SR_ERR;
	468
	469	usb_source_add(sdi->session, drvc->sr_ctx, 10,
	470	kecheng_kc_330b_handle_events, (void *)sdi);
	471
	472	if (devc->data_source == DATA_SOURCE_LIVE) {
	473	buf[0] = CMD_GET_LIVE_SPL;
	474	buf_len = 1;
	475	devc->state = LIVE_SPL_WAIT;
	476	devc->last_live_request = g_get_monotonic_time() / 1000;
	477	req_len = 3;
	478	} else {
	479	buf[0] = CMD_GET_LOG_DATA;
	480	buf[1] = 0;
	481	buf[2] = 0;
	482	buf_len = 4;
	483	devc->state = LOG_DATA_WAIT;
	484	if (devc->stored_samples < 63)
	485	buf[3] = devc->stored_samples;
	486	else
	487	buf[3] = 63;
	488	/* Command ack byte + 2 bytes per sample. */
	489	req_len = 1 + buf[3] * 2;
	490	}
	491
	492	ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, buf, buf_len, &len, 5);
	493	if (ret != 0 \|\| len != 1) {
	494	sr_dbg("Failed to start acquisition: %s", libusb_error_name(ret));
	495	libusb_free_transfer(devc->xfer);
	496	return SR_ERR;
	497	}
	498
	499	libusb_fill_bulk_transfer(devc->xfer, usb->devhdl, EP_IN, devc->buf,
	500	req_len, kecheng_kc_330b_receive_transfer, (void *)sdi, 15);
	501	if (libusb_submit_transfer(devc->xfer) != 0) {
	502	libusb_free_transfer(devc->xfer);
	503	return SR_ERR;
	504	}
	505
	506	return SR_OK;
	507	}
	508
	509	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	510	{
	511	struct dev_context *devc;
	512
	513	if (sdi->status != SR_ST_ACTIVE)
	514	return SR_ERR_DEV_CLOSED;
	515
	516	/* Signal USB transfer handler to clean up and stop. */
	517	sdi->status = SR_ST_STOPPING;
	518
	519	devc = sdi->priv;
	520	if (devc->data_source == DATA_SOURCE_MEMORY && devc->config_dirty) {
	521	/* The protocol doesn't have a command to clear stored data;
	522	* it clears it whenever new configuration is set. That means
	523	* we can't just configure the device any time we want when
	524	* it's in DATA_SOURCE_MEMORY mode. The only safe time to do
	525	* it is now, when we're sure we've pulled in all the stored
	526	* data. */
	527	kecheng_kc_330b_configure(sdi);
	528	}
	529
	530	return SR_OK;
	531	}
	532
	533	SR_PRIV struct sr_dev_driver kecheng_kc_330b_driver_info = {
	534	.name = "kecheng-kc-330b",
	535	.longname = "Kecheng KC-330B",
	536	.api_version = 1,
	537	.init = init,
	538	.cleanup = std_cleanup,
	539	.scan = scan,
	540	.dev_list = dev_list,
	541	.dev_clear = NULL,
	542	.config_get = config_get,
	543	.config_set = config_set,
	544	.config_list = config_list,
	545	.dev_open = dev_open,
	546	.dev_close = dev_close,
	547	.dev_acquisition_start = dev_acquisition_start,
	548	.dev_acquisition_stop = dev_acquisition_stop,
	549	.context = NULL,
	550	};