[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->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? */

			devices = g_slist_append(devices, sdi);
		}
		g_slist_free(usb_devices);
	} else
		g_slist_free_full(usb_devices, g_free);

	return std_scan_complete(di, 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;
	}

	return SR_OK;
}

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)
		return SR_ERR_BUG;

	/* 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;

	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;
	const char *tmp_str;

	(void)cg;

	devc = sdi->priv;
	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))
			return 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:
		return SR_ERR_NA;
	}

	return SR_OK;
}

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;

	switch (key) {
	case SR_CONF_DEVICE_OPTIONS:
		return STD_CONFIG_LIST(key, data, sdi, cg, NULL, NULL, devopts);
	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];

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

	devc->num_samples = 0;

	std_session_send_df_header(sdi);

	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);
			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;

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