[libsigrok.git] / hardware / serial-dmm / api.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
 * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
 * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
 *
 * 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 <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <glib.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"

static const int hwopts[] = {
	SR_HWOPT_CONN,
	SR_HWOPT_SERIALCOMM,
	0,
};

static const int hwcaps[] = {
	SR_HWCAP_MULTIMETER,
	SR_HWCAP_LIMIT_SAMPLES,
	SR_HWCAP_CONTINUOUS,
	0,
};

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

SR_PRIV struct sr_dev_driver digitek_dt4000zc_driver_info;
SR_PRIV struct sr_dev_driver tekpower_tp4000zc_driver_info;
SR_PRIV struct sr_dev_driver metex_me31_driver_info;
SR_PRIV struct sr_dev_driver peaktech_3410_driver_info;
SR_PRIV struct sr_dev_driver mastech_mas345_driver_info;
SR_PRIV struct sr_dev_driver va_va18b_driver_info;
SR_PRIV struct sr_dev_driver metex_m3640d_driver_info;
SR_PRIV struct sr_dev_driver peaktech_4370_driver_info;
SR_PRIV struct sr_dev_driver pce_pce_dm32_driver_info;
SR_PRIV struct sr_dev_driver radioshack_22_168_driver_info;
SR_PRIV struct sr_dev_driver radioshack_22_812_driver_info;
SR_PRIV struct sr_dev_driver voltcraft_vc820_ser_driver_info;

SR_PRIV struct dmm_info dmms[] = {
	{
		"Digitek", "DT4000ZC", "2400/8n1", 2400,
		FS9721_PACKET_SIZE, NULL,
		sr_fs9721_packet_valid, sr_fs9721_parse,
		dmm_details_dt4000zc,
		&digitek_dt4000zc_driver_info, receive_data_DIGITEK_DT4000ZC,
	},
	{
		"TekPower", "TP4000ZC", "2400/8n1", 2400,
		FS9721_PACKET_SIZE, NULL,
		sr_fs9721_packet_valid, sr_fs9721_parse,
		dmm_details_tp4000zc,
		&tekpower_tp4000zc_driver_info, receive_data_TEKPOWER_TP4000ZC,
	},
	{
		"Metex", "ME-31", "600/7n2/rts=0/dtr=1", 600,
		METEX14_PACKET_SIZE, sr_metex14_packet_request,
		sr_metex14_packet_valid, sr_metex14_parse,
		NULL,
		&metex_me31_driver_info, receive_data_METEX_ME31,
	},
	{
		"Peaktech", "3410", "600/7n2/rts=0/dtr=1", 600,
		METEX14_PACKET_SIZE, sr_metex14_packet_request,
		sr_metex14_packet_valid, sr_metex14_parse,
		NULL,
		&peaktech_3410_driver_info, receive_data_PEAKTECH_3410,
	},
	{
		"MASTECH", "MAS345", "600/7n2/rts=0/dtr=1", 600,
		METEX14_PACKET_SIZE, sr_metex14_packet_request,
		sr_metex14_packet_valid, sr_metex14_parse,
		NULL,
		&mastech_mas345_driver_info, receive_data_MASTECH_MAS345,
	},
	{
		"V&A", "VA18B", "2400/8n1", 2400,
		FS9721_PACKET_SIZE, NULL,
		sr_fs9721_packet_valid, sr_fs9721_parse,
		dmm_details_va18b,
		&va_va18b_driver_info, receive_data_VA_VA18B,
	},
	{
		"Metex", "M-3640D", "1200/7n2/rts=0/dtr=1", 1200,
		METEX14_PACKET_SIZE, sr_metex14_packet_request,
		sr_metex14_packet_valid, sr_metex14_parse,
		NULL,
		&metex_m3640d_driver_info, receive_data_METEX_M3640D,
	},
	{
		"PeakTech", "4370", "1200/7n2/rts=0/dtr=1", 1200,
		METEX14_PACKET_SIZE, sr_metex14_packet_request,
		sr_metex14_packet_valid, sr_metex14_parse,
		NULL,
		&peaktech_4370_driver_info, receive_data_PEAKTECH_4370,
	},
	{
		"PCE", "PCE-DM32", "2400/8n1", 2400,
		FS9721_PACKET_SIZE, NULL,
		sr_fs9721_packet_valid, sr_fs9721_parse,
		dmm_details_pce_dm32,
		&pce_pce_dm32_driver_info, receive_data_PCE_PCE_DM32,
	},
	{
		"RadioShack", "22-168", "1200/7n2/rts=0/dtr=1", 1200,
		METEX14_PACKET_SIZE, sr_metex14_packet_request,
		sr_metex14_packet_valid, sr_metex14_parse,
		NULL,
		&radioshack_22_168_driver_info, receive_data_RADIOSHACK_22_168,
	},
	{
		"RadioShack", "22-812", "4800/8n1/rts=0/dtr=1", 4800,
		RS9LCD_PACKET_SIZE, NULL,
		sr_rs9lcd_packet_valid, sr_rs9lcd_parse,
		NULL,
		&radioshack_22_812_driver_info, receive_data_RADIOSHACK_22_812,
	},
	{
		"Voltcraft", "VC-820 (UT-D02 cable)", "2400/8n1/rts=0/dtr=1",
		2400, FS9721_PACKET_SIZE, NULL,
		sr_fs9721_packet_valid, sr_fs9721_parse,
		NULL,
		&voltcraft_vc820_ser_driver_info, receive_data_VOLTCRAFT_VC820,
	},
};

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

	di = dmms[dmm].di;

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

	drvc = di->priv;
	for (l = drvc->instances; l; l = l->next) {
		if (!(sdi = l->data))
			continue;
		if (!(devc = sdi->priv))
			continue;
		sr_serial_dev_inst_free(devc->serial);
		sr_dev_inst_free(sdi);
	}
	g_slist_free(drvc->instances);
	drvc->instances = NULL;

	return SR_OK;
}

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

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

	sr_dbg("Selected '%s' subdriver.", dmms[dmm].di->name);

	drvc->sr_ctx = sr_ctx;
	dmms[dmm].di->priv = drvc;

	return SR_OK;
}

static GSList *scan(const char *conn, const char *serialcomm, int dmm)
{
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_probe *probe;
	struct sr_serial_dev_inst *serial;
	GSList *devices;
	int dropped, ret;
	size_t len;
	uint8_t buf[128];

	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
		return NULL;

	if (serial_open(serial, SERIAL_RDWR | SERIAL_NONBLOCK) != SR_OK)
		return NULL;

	sr_info("Probing serial port %s.", conn);

	drvc = dmms[dmm].di->priv;
	devices = NULL;
	serial_flush(serial);

	/* Request a packet if the DMM requires this. */
	if (dmms[dmm].packet_request) {
		if ((ret = dmms[dmm].packet_request(serial)) < 0) {
			sr_err("Failed to request packet: %d.", ret);
			return FALSE;
		}
	}

	/*
	 * There's no way to get an ID from the multimeter. It just sends data
	 * periodically (or upon request), so the best we can do is check if
	 * the packets match the expected format.
	 */

	/* Let's get a bit of data and see if we can find a packet. */
	len = sizeof(buf);
	ret = serial_stream_detect(serial, buf, &len, dmms[dmm].packet_size,
				   dmms[dmm].packet_valid, 1000,
				   dmms[dmm].baudrate);
	if (ret != SR_OK)
		goto scan_cleanup;

	/*
	 * If we dropped more than two packets worth of data, something is
	 * wrong. We shouldn't quit however, since the dropped bytes might be
	 * just zeroes at the beginning of the stream. Those can occur as a
	 * combination of the nonstandard cable that ships with some devices
	 * and the serial port or USB to serial adapter.
	 */
	dropped = len - dmms[dmm].packet_size;
	if (dropped > 2 * dmms[dmm].packet_size)
		sr_warn("Had to drop too much data.");

	sr_info("Found device on port %s.", conn);

	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, dmms[dmm].vendor,
				    dmms[dmm].device, "")))
		goto scan_cleanup;

	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
		sr_err("Device context malloc failed.");
		goto scan_cleanup;
	}

	devc->serial = serial;

	sdi->priv = devc;
	sdi->driver = dmms[dmm].di;
	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
		goto scan_cleanup;
	sdi->probes = g_slist_append(sdi->probes, probe);
	drvc->instances = g_slist_append(drvc->instances, sdi);
	devices = g_slist_append(devices, sdi);

scan_cleanup:
	serial_close(serial);

	return devices;
}

static GSList *hw_scan(GSList *options, int dmm)
{
	struct sr_hwopt *opt;
	GSList *l, *devices;
	const char *conn, *serialcomm;

	conn = serialcomm = NULL;
	for (l = options; l; l = l->next) {
		opt = l->data;
		switch (opt->hwopt) {
		case SR_HWOPT_CONN:
			conn = opt->value;
			break;
		case SR_HWOPT_SERIALCOMM:
			serialcomm = opt->value;
			break;
		}
	}
	if (!conn)
		return NULL;

	if (serialcomm) {
		/* Use the provided comm specs. */
		devices = scan(conn, serialcomm, dmm);
	} else {
		/* Try the default. */
		devices = scan(conn, dmms[dmm].conn, dmm);
	}

	return devices;
}

static GSList *hw_dev_list(int dmm)
{
	struct drv_context *drvc;

	drvc = dmms[dmm].di->priv;

	return drvc->instances;
}

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

	if (!(devc = sdi->priv)) {
		sr_err("sdi->priv was NULL.");
		return SR_ERR_BUG;
	}

	if (serial_open(devc->serial, SERIAL_RDWR | SERIAL_NONBLOCK) != SR_OK)
		return SR_ERR;

	sdi->status = SR_ST_ACTIVE;

	return SR_OK;
}

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

	if (!(devc = sdi->priv)) {
		sr_err("sdi->priv was NULL.");
		return SR_ERR_BUG;
	}

	if (devc->serial && devc->serial->fd != -1) {
		serial_close(devc->serial);
		sdi->status = SR_ST_INACTIVE;
	}

	return SR_OK;
}

static int hw_cleanup(int dmm)
{
	clear_instances(dmm);

	return SR_OK;
}

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

	switch (info_id) {
	case SR_DI_HWOPTS:
		*data = hwopts;
		break;
	case SR_DI_HWCAPS:
		*data = hwcaps;
		break;
	case SR_DI_NUM_PROBES:
		*data = GINT_TO_POINTER(1);
		break;
	case SR_DI_PROBE_NAMES:
		*data = probe_names;
		break;
	default:
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
			     const void *value)
{
	struct dev_context *devc;

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

	if (!(devc = sdi->priv)) {
		sr_err("sdi->priv was NULL.");
		return SR_ERR_BUG;
	}

	switch (hwcap) {
	case SR_HWCAP_LIMIT_SAMPLES:
		devc->limit_samples = *(const uint64_t *)value;
		sr_dbg("Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	default:
		sr_err("Unknown capability: %d.", hwcap);
		return SR_ERR;
		break;
	}

	return SR_OK;
}

static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
				    void *cb_data, int dmm)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_header header;
	struct sr_datafeed_meta_analog meta;
	struct dev_context *devc;

	if (!(devc = sdi->priv)) {
		sr_err("sdi->priv was NULL.");
		return SR_ERR_BUG;
	}

	sr_dbg("Starting acquisition.");

	devc->cb_data = cb_data;

	/*
	 * Reset the number of samples to take. If we've already collected our
	 * quota, but we start a new session, and don't reset this, we'll just
	 * quit without acquiring any new samples.
	 */
	devc->num_samples = 0;

	/* Send header packet to the session bus. */
	sr_dbg("Sending SR_DF_HEADER.");
	packet.type = SR_DF_HEADER;
	packet.payload = (uint8_t *)&header;
	header.feed_version = 1;
	gettimeofday(&header.starttime, NULL);
	sr_session_send(devc->cb_data, &packet);

	/* Send metadata about the SR_DF_ANALOG packets to come. */
	sr_dbg("Sending SR_DF_META_ANALOG.");
	packet.type = SR_DF_META_ANALOG;
	packet.payload = &meta;
	meta.num_probes = 1;
	sr_session_send(devc->cb_data, &packet);

	/* Poll every 50ms, or whenever some data comes in. */
	sr_source_add(devc->serial->fd, G_IO_IN, 50,
		      dmms[dmm].receive_data, (void *)sdi);

	return SR_OK;
}

static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct dev_context *devc;

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

	if (!(devc = sdi->priv)) {
		sr_err("sdi->priv was NULL.");
		return SR_ERR_BUG;
	}

	sr_dbg("Stopping acquisition.");

	sr_source_remove(devc->serial->fd);
	hw_dev_close((struct sr_dev_inst *)sdi);

	/* Send end packet to the session bus. */
	sr_dbg("Sending SR_DF_END.");
	packet.type = SR_DF_END;
	sr_session_send(cb_data, &packet);

	return SR_OK;
}

/* Driver-specific API function wrappers */
#define HW_INIT(X) \
static int hw_init_##X(struct sr_context *sr_ctx) { return hw_init(sr_ctx, X); }
#define HW_CLEANUP(X) \
static int hw_cleanup_##X(void) { return hw_cleanup(X); }
#define HW_SCAN(X) \
static GSList *hw_scan_##X(GSList *options) { return hw_scan(options, X); }
#define HW_DEV_LIST(X) \
static GSList *hw_dev_list_##X(void) { return hw_dev_list(X); }
#define CLEAR_INSTANCES(X) \
static int clear_instances_##X(void) { return clear_instances(X); }
#define HW_DEV_ACQUISITION_START(X) \
static int hw_dev_acquisition_start_##X(const struct sr_dev_inst *sdi, \
void *cb_data) { return hw_dev_acquisition_start(sdi, cb_data, X); }

/* Driver structs and API function wrappers */
#define DRV(ID, ID_UPPER, NAME, LONGNAME) \
HW_INIT(ID_UPPER) \
HW_CLEANUP(ID_UPPER) \
HW_SCAN(ID_UPPER) \
HW_DEV_LIST(ID_UPPER) \
CLEAR_INSTANCES(ID_UPPER) \
HW_DEV_ACQUISITION_START(ID_UPPER) \
SR_PRIV struct sr_dev_driver ID##_driver_info = { \
	.name = NAME, \
	.longname = LONGNAME, \
	.api_version = 1, \
	.init = hw_init_##ID_UPPER, \
	.cleanup = hw_cleanup_##ID_UPPER, \
	.scan = hw_scan_##ID_UPPER, \
	.dev_list = hw_dev_list_##ID_UPPER, \
	.dev_clear = clear_instances_##ID_UPPER, \
	.dev_open = hw_dev_open, \
	.dev_close = hw_dev_close, \
	.info_get = hw_info_get, \
	.dev_config_set = hw_dev_config_set, \
	.dev_acquisition_start = hw_dev_acquisition_start_##ID_UPPER, \
	.dev_acquisition_stop = hw_dev_acquisition_stop, \
	.priv = NULL, \
};

DRV(digitek_dt4000zc, DIGITEK_DT4000ZC, "digitek-dt4000zc", "Digitek DT4000ZC")
DRV(tekpower_tp4000zc, TEKPOWER_TP4000ZC, "tekpower-tp4000zc", "TekPower TP4000ZC")
DRV(metex_me31, METEX_ME31, "metex-me31", "Metex ME-31")
DRV(peaktech_3410, PEAKTECH_3410, "peaktech-3410", "PeakTech 3410")
DRV(mastech_mas345, MASTECH_MAS345, "mastech-mas345", "MASTECH MAS345")
DRV(va_va18b, VA_VA18B, "va-va18b", "V&A VA18B")
DRV(metex_m3640d, METEX_M3640D, "metex-m3640d", "Metex M-3640D")
DRV(peaktech_4370, PEAKTECH_4370, "peaktech-4370", "PeakTech 4370")
DRV(pce_pce_dm32, PCE_PCE_DM32, "pce-pce-dm32", "PCE PCE-DM32")
DRV(radioshack_22_168, RADIOSHACK_22_168, "radioshack-22-168", "RadioShack 22-168")
DRV(radioshack_22_812, RADIOSHACK_22_812, "radioshack-22-812", "RadioShack 22-812")
DRV(voltcraft_vc820_ser, VOLTCRAFT_VC820, "voltcraft-vc820-ser", "Voltcraft VC-820 (UT-D02 cable)")
DRV(voltcraft_vc840_ser, VOLTCRAFT_VC840, "voltcraft-vc840-ser", "Voltcraft VC-840 (UT-D02 cable)")
Commit	Line	Data
	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
	5	* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
	6	* Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
	7	*
	8	* This program is free software: you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation, either version 3 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	20	*/
	21
	22	#include <sys/types.h>
	23	#include <sys/stat.h>
	24	#include <fcntl.h>
	25	#include <string.h>
	26	#include <errno.h>
	27	#include <glib.h>
	28	#include "libsigrok.h"
	29	#include "libsigrok-internal.h"
	30	#include "protocol.h"
	31
	32	static const int hwopts[] = {
	33	SR_HWOPT_CONN,
	34	SR_HWOPT_SERIALCOMM,
	35	0,
	36	};
	37
	38	static const int hwcaps[] = {
	39	SR_HWCAP_MULTIMETER,
	40	SR_HWCAP_LIMIT_SAMPLES,
	41	SR_HWCAP_CONTINUOUS,
	42	0,
	43	};
	44
	45	static const char *probe_names[] = {
	46	"Probe",
	47	NULL,
	48	};
	49
	50	SR_PRIV struct sr_dev_driver digitek_dt4000zc_driver_info;
	51	SR_PRIV struct sr_dev_driver tekpower_tp4000zc_driver_info;
	52	SR_PRIV struct sr_dev_driver metex_me31_driver_info;
	53	SR_PRIV struct sr_dev_driver peaktech_3410_driver_info;
	54	SR_PRIV struct sr_dev_driver mastech_mas345_driver_info;
	55	SR_PRIV struct sr_dev_driver va_va18b_driver_info;
	56	SR_PRIV struct sr_dev_driver metex_m3640d_driver_info;
	57	SR_PRIV struct sr_dev_driver peaktech_4370_driver_info;
	58	SR_PRIV struct sr_dev_driver pce_pce_dm32_driver_info;
	59	SR_PRIV struct sr_dev_driver radioshack_22_168_driver_info;
	60	SR_PRIV struct sr_dev_driver radioshack_22_812_driver_info;
	61	SR_PRIV struct sr_dev_driver voltcraft_vc820_ser_driver_info;
	62
	63	SR_PRIV struct dmm_info dmms[] = {
	64	{
	65	"Digitek", "DT4000ZC", "2400/8n1", 2400,
	66	FS9721_PACKET_SIZE, NULL,
	67	sr_fs9721_packet_valid, sr_fs9721_parse,
	68	dmm_details_dt4000zc,
	69	&digitek_dt4000zc_driver_info, receive_data_DIGITEK_DT4000ZC,
	70	},
	71	{
	72	"TekPower", "TP4000ZC", "2400/8n1", 2400,
	73	FS9721_PACKET_SIZE, NULL,
	74	sr_fs9721_packet_valid, sr_fs9721_parse,
	75	dmm_details_tp4000zc,
	76	&tekpower_tp4000zc_driver_info, receive_data_TEKPOWER_TP4000ZC,
	77	},
	78	{
	79	"Metex", "ME-31", "600/7n2/rts=0/dtr=1", 600,
	80	METEX14_PACKET_SIZE, sr_metex14_packet_request,
	81	sr_metex14_packet_valid, sr_metex14_parse,
	82	NULL,
	83	&metex_me31_driver_info, receive_data_METEX_ME31,
	84	},
	85	{
	86	"Peaktech", "3410", "600/7n2/rts=0/dtr=1", 600,
	87	METEX14_PACKET_SIZE, sr_metex14_packet_request,
	88	sr_metex14_packet_valid, sr_metex14_parse,
	89	NULL,
	90	&peaktech_3410_driver_info, receive_data_PEAKTECH_3410,
	91	},
	92	{
	93	"MASTECH", "MAS345", "600/7n2/rts=0/dtr=1", 600,
	94	METEX14_PACKET_SIZE, sr_metex14_packet_request,
	95	sr_metex14_packet_valid, sr_metex14_parse,
	96	NULL,
	97	&mastech_mas345_driver_info, receive_data_MASTECH_MAS345,
	98	},
	99	{
	100	"V&A", "VA18B", "2400/8n1", 2400,
	101	FS9721_PACKET_SIZE, NULL,
	102	sr_fs9721_packet_valid, sr_fs9721_parse,
	103	dmm_details_va18b,
	104	&va_va18b_driver_info, receive_data_VA_VA18B,
	105	},
	106	{
	107	"Metex", "M-3640D", "1200/7n2/rts=0/dtr=1", 1200,
	108	METEX14_PACKET_SIZE, sr_metex14_packet_request,
	109	sr_metex14_packet_valid, sr_metex14_parse,
	110	NULL,
	111	&metex_m3640d_driver_info, receive_data_METEX_M3640D,
	112	},
	113	{
	114	"PeakTech", "4370", "1200/7n2/rts=0/dtr=1", 1200,
	115	METEX14_PACKET_SIZE, sr_metex14_packet_request,
	116	sr_metex14_packet_valid, sr_metex14_parse,
	117	NULL,
	118	&peaktech_4370_driver_info, receive_data_PEAKTECH_4370,
	119	},
	120	{
	121	"PCE", "PCE-DM32", "2400/8n1", 2400,
	122	FS9721_PACKET_SIZE, NULL,
	123	sr_fs9721_packet_valid, sr_fs9721_parse,
	124	dmm_details_pce_dm32,
	125	&pce_pce_dm32_driver_info, receive_data_PCE_PCE_DM32,
	126	},
	127	{
	128	"RadioShack", "22-168", "1200/7n2/rts=0/dtr=1", 1200,
	129	METEX14_PACKET_SIZE, sr_metex14_packet_request,
	130	sr_metex14_packet_valid, sr_metex14_parse,
	131	NULL,
	132	&radioshack_22_168_driver_info, receive_data_RADIOSHACK_22_168,
	133	},
	134	{
	135	"RadioShack", "22-812", "4800/8n1/rts=0/dtr=1", 4800,
	136	RS9LCD_PACKET_SIZE, NULL,
	137	sr_rs9lcd_packet_valid, sr_rs9lcd_parse,
	138	NULL,
	139	&radioshack_22_812_driver_info, receive_data_RADIOSHACK_22_812,
	140	},
	141	{
	142	"Voltcraft", "VC-820 (UT-D02 cable)", "2400/8n1/rts=0/dtr=1",
	143	2400, FS9721_PACKET_SIZE, NULL,
	144	sr_fs9721_packet_valid, sr_fs9721_parse,
	145	NULL,
	146	&voltcraft_vc820_ser_driver_info, receive_data_VOLTCRAFT_VC820,
	147	},
	148	};
	149
	150	/* Properly close and free all devices. */
	151	static int clear_instances(int dmm)
	152	{
	153	struct sr_dev_inst *sdi;
	154	struct drv_context *drvc;
	155	struct dev_context *devc;
	156	GSList *l;
	157	struct sr_dev_driver *di;
	158
	159	di = dmms[dmm].di;
	160
	161	if (!(drvc = di->priv))
	162	return SR_OK;
	163
	164	drvc = di->priv;
	165	for (l = drvc->instances; l; l = l->next) {
	166	if (!(sdi = l->data))
	167	continue;
	168	if (!(devc = sdi->priv))
	169	continue;
	170	sr_serial_dev_inst_free(devc->serial);
	171	sr_dev_inst_free(sdi);
	172	}
	173	g_slist_free(drvc->instances);
	174	drvc->instances = NULL;
	175
	176	return SR_OK;
	177	}
	178
	179	static int hw_init(struct sr_context *sr_ctx, int dmm)
	180	{
	181	struct drv_context *drvc;
	182
	183	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	184	sr_err("Driver context malloc failed.");
	185	return SR_ERR_MALLOC;
	186	}
	187
	188	sr_dbg("Selected '%s' subdriver.", dmms[dmm].di->name);
	189
	190	drvc->sr_ctx = sr_ctx;
	191	dmms[dmm].di->priv = drvc;
	192
	193	return SR_OK;
	194	}
	195
	196	static GSList scan(const char conn, const char *serialcomm, int dmm)
	197	{
	198	struct sr_dev_inst *sdi;
	199	struct drv_context *drvc;
	200	struct dev_context *devc;
	201	struct sr_probe *probe;
	202	struct sr_serial_dev_inst *serial;
	203	GSList *devices;
	204	int dropped, ret;
	205	size_t len;
	206	uint8_t buf[128];
	207
	208	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
	209	return NULL;
	210
	211	if (serial_open(serial, SERIAL_RDWR \| SERIAL_NONBLOCK) != SR_OK)
	212	return NULL;
	213
	214	sr_info("Probing serial port %s.", conn);
	215
	216	drvc = dmms[dmm].di->priv;
	217	devices = NULL;
	218	serial_flush(serial);
	219
	220	/* Request a packet if the DMM requires this. */
	221	if (dmms[dmm].packet_request) {
	222	if ((ret = dmms[dmm].packet_request(serial)) < 0) {
	223	sr_err("Failed to request packet: %d.", ret);
	224	return FALSE;
	225	}
	226	}
	227
	228	/*
	229	* There's no way to get an ID from the multimeter. It just sends data
	230	* periodically (or upon request), so the best we can do is check if
	231	* the packets match the expected format.
	232	*/
	233
	234	/* Let's get a bit of data and see if we can find a packet. */
	235	len = sizeof(buf);
	236	ret = serial_stream_detect(serial, buf, &len, dmms[dmm].packet_size,
	237	dmms[dmm].packet_valid, 1000,
	238	dmms[dmm].baudrate);
	239	if (ret != SR_OK)
	240	goto scan_cleanup;
	241
	242	/*
	243	* If we dropped more than two packets worth of data, something is
	244	* wrong. We shouldn't quit however, since the dropped bytes might be
	245	* just zeroes at the beginning of the stream. Those can occur as a
	246	* combination of the nonstandard cable that ships with some devices
	247	* and the serial port or USB to serial adapter.
	248	*/
	249	dropped = len - dmms[dmm].packet_size;
	250	if (dropped > 2 * dmms[dmm].packet_size)
	251	sr_warn("Had to drop too much data.");
	252
	253	sr_info("Found device on port %s.", conn);
	254
	255	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, dmms[dmm].vendor,
	256	dmms[dmm].device, "")))
	257	goto scan_cleanup;
	258
	259	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
	260	sr_err("Device context malloc failed.");
	261	goto scan_cleanup;
	262	}
	263
	264	devc->serial = serial;
	265
	266	sdi->priv = devc;
	267	sdi->driver = dmms[dmm].di;
	268	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	269	goto scan_cleanup;
	270	sdi->probes = g_slist_append(sdi->probes, probe);
	271	drvc->instances = g_slist_append(drvc->instances, sdi);
	272	devices = g_slist_append(devices, sdi);
	273
	274	scan_cleanup:
	275	serial_close(serial);
	276
	277	return devices;
	278	}
	279
	280	static GSList hw_scan(GSList options, int dmm)
	281	{
	282	struct sr_hwopt *opt;
	283	GSList l, devices;
	284	const char conn, serialcomm;
	285
	286	conn = serialcomm = NULL;
	287	for (l = options; l; l = l->next) {
	288	opt = l->data;
	289	switch (opt->hwopt) {
	290	case SR_HWOPT_CONN:
	291	conn = opt->value;
	292	break;
	293	case SR_HWOPT_SERIALCOMM:
	294	serialcomm = opt->value;
	295	break;
	296	}
	297	}
	298	if (!conn)
	299	return NULL;
	300
	301	if (serialcomm) {
	302	/* Use the provided comm specs. */
	303	devices = scan(conn, serialcomm, dmm);
	304	} else {
	305	/* Try the default. */
	306	devices = scan(conn, dmms[dmm].conn, dmm);
	307	}
	308
	309	return devices;
	310	}
	311
	312	static GSList *hw_dev_list(int dmm)
	313	{
	314	struct drv_context *drvc;
	315
	316	drvc = dmms[dmm].di->priv;
	317
	318	return drvc->instances;
	319	}
	320
	321	static int hw_dev_open(struct sr_dev_inst *sdi)
	322	{
	323	struct dev_context *devc;
	324
	325	if (!(devc = sdi->priv)) {
	326	sr_err("sdi->priv was NULL.");
	327	return SR_ERR_BUG;
	328	}
	329
	330	if (serial_open(devc->serial, SERIAL_RDWR \| SERIAL_NONBLOCK) != SR_OK)
	331	return SR_ERR;
	332
	333	sdi->status = SR_ST_ACTIVE;
	334
	335	return SR_OK;
	336	}
	337
	338	static int hw_dev_close(struct sr_dev_inst *sdi)
	339	{
	340	struct dev_context *devc;
	341
	342	if (!(devc = sdi->priv)) {
	343	sr_err("sdi->priv was NULL.");
	344	return SR_ERR_BUG;
	345	}
	346
	347	if (devc->serial && devc->serial->fd != -1) {
	348	serial_close(devc->serial);
	349	sdi->status = SR_ST_INACTIVE;
	350	}
	351
	352	return SR_OK;
	353	}
	354
	355	static int hw_cleanup(int dmm)
	356	{
	357	clear_instances(dmm);
	358
	359	return SR_OK;
	360	}
	361
	362	static int hw_info_get(int info_id, const void **data,
	363	const struct sr_dev_inst *sdi)
	364	{
	365	(void)sdi;
	366
	367	switch (info_id) {
	368	case SR_DI_HWOPTS:
	369	*data = hwopts;
	370	break;
	371	case SR_DI_HWCAPS:
	372	*data = hwcaps;
	373	break;
	374	case SR_DI_NUM_PROBES:
	375	*data = GINT_TO_POINTER(1);
	376	break;
	377	case SR_DI_PROBE_NAMES:
	378	*data = probe_names;
	379	break;
	380	default:
	381	return SR_ERR_ARG;
	382	}
	383
	384	return SR_OK;
	385	}
	386
	387	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	388	const void *value)
	389	{
	390	struct dev_context *devc;
	391
	392	if (sdi->status != SR_ST_ACTIVE)
	393	return SR_ERR;
	394
	395	if (!(devc = sdi->priv)) {
	396	sr_err("sdi->priv was NULL.");
	397	return SR_ERR_BUG;
	398	}
	399
	400	switch (hwcap) {
	401	case SR_HWCAP_LIMIT_SAMPLES:
	402	devc->limit_samples = (const uint64_t )value;
	403	sr_dbg("Setting sample limit to %" PRIu64 ".",
	404	devc->limit_samples);
	405	break;
	406	default:
	407	sr_err("Unknown capability: %d.", hwcap);
	408	return SR_ERR;
	409	break;
	410	}
	411
	412	return SR_OK;
	413	}
	414
	415	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	416	void *cb_data, int dmm)
	417	{
	418	struct sr_datafeed_packet packet;
	419	struct sr_datafeed_header header;
	420	struct sr_datafeed_meta_analog meta;
	421	struct dev_context *devc;
	422
	423	if (!(devc = sdi->priv)) {
	424	sr_err("sdi->priv was NULL.");
	425	return SR_ERR_BUG;
	426	}
	427
	428	sr_dbg("Starting acquisition.");
	429
	430	devc->cb_data = cb_data;
	431
	432	/*
	433	* Reset the number of samples to take. If we've already collected our
	434	* quota, but we start a new session, and don't reset this, we'll just
	435	* quit without acquiring any new samples.
	436	*/
	437	devc->num_samples = 0;
	438
	439	/* Send header packet to the session bus. */
	440	sr_dbg("Sending SR_DF_HEADER.");
	441	packet.type = SR_DF_HEADER;
	442	packet.payload = (uint8_t *)&header;
	443	header.feed_version = 1;
	444	gettimeofday(&header.starttime, NULL);
	445	sr_session_send(devc->cb_data, &packet);
	446
	447	/* Send metadata about the SR_DF_ANALOG packets to come. */
	448	sr_dbg("Sending SR_DF_META_ANALOG.");
	449	packet.type = SR_DF_META_ANALOG;
	450	packet.payload = &meta;
	451	meta.num_probes = 1;
	452	sr_session_send(devc->cb_data, &packet);
	453
	454	/* Poll every 50ms, or whenever some data comes in. */
	455	sr_source_add(devc->serial->fd, G_IO_IN, 50,
	456	dmms[dmm].receive_data, (void *)sdi);
	457
	458	return SR_OK;
	459	}
	460
	461	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	462	{
	463	struct sr_datafeed_packet packet;
	464	struct dev_context *devc;
	465
	466	if (sdi->status != SR_ST_ACTIVE)
	467	return SR_ERR;
	468
	469	if (!(devc = sdi->priv)) {
	470	sr_err("sdi->priv was NULL.");
	471	return SR_ERR_BUG;
	472	}
	473
	474	sr_dbg("Stopping acquisition.");
	475
	476	sr_source_remove(devc->serial->fd);
	477	hw_dev_close((struct sr_dev_inst *)sdi);
	478
	479	/* Send end packet to the session bus. */
	480	sr_dbg("Sending SR_DF_END.");
	481	packet.type = SR_DF_END;
	482	sr_session_send(cb_data, &packet);
	483
	484	return SR_OK;
	485	}
	486
	487	/* Driver-specific API function wrappers */
	488	#define HW_INIT(X) \
	489	static int hw_init_##X(struct sr_context *sr_ctx) { return hw_init(sr_ctx, X); }
	490	#define HW_CLEANUP(X) \
	491	static int hw_cleanup_##X(void) { return hw_cleanup(X); }
	492	#define HW_SCAN(X) \
	493	static GSList hw_scan_##X(GSList options) { return hw_scan(options, X); }
	494	#define HW_DEV_LIST(X) \
	495	static GSList *hw_dev_list_##X(void) { return hw_dev_list(X); }
	496	#define CLEAR_INSTANCES(X) \
	497	static int clear_instances_##X(void) { return clear_instances(X); }
	498	#define HW_DEV_ACQUISITION_START(X) \
	499	static int hw_dev_acquisition_start_##X(const struct sr_dev_inst *sdi, \
	500	void *cb_data) { return hw_dev_acquisition_start(sdi, cb_data, X); }
	501
	502	/* Driver structs and API function wrappers */
	503	#define DRV(ID, ID_UPPER, NAME, LONGNAME) \
	504	HW_INIT(ID_UPPER) \
	505	HW_CLEANUP(ID_UPPER) \
	506	HW_SCAN(ID_UPPER) \
	507	HW_DEV_LIST(ID_UPPER) \
	508	CLEAR_INSTANCES(ID_UPPER) \
	509	HW_DEV_ACQUISITION_START(ID_UPPER) \
	510	SR_PRIV struct sr_dev_driver ID##_driver_info = { \
	511	.name = NAME, \
	512	.longname = LONGNAME, \
	513	.api_version = 1, \
	514	.init = hw_init_##ID_UPPER, \
	515	.cleanup = hw_cleanup_##ID_UPPER, \
	516	.scan = hw_scan_##ID_UPPER, \
	517	.dev_list = hw_dev_list_##ID_UPPER, \
	518	.dev_clear = clear_instances_##ID_UPPER, \
	519	.dev_open = hw_dev_open, \
	520	.dev_close = hw_dev_close, \
	521	.info_get = hw_info_get, \
	522	.dev_config_set = hw_dev_config_set, \
	523	.dev_acquisition_start = hw_dev_acquisition_start_##ID_UPPER, \
	524	.dev_acquisition_stop = hw_dev_acquisition_stop, \
	525	.priv = NULL, \
	526	};
	527
	528	DRV(digitek_dt4000zc, DIGITEK_DT4000ZC, "digitek-dt4000zc", "Digitek DT4000ZC")
	529	DRV(tekpower_tp4000zc, TEKPOWER_TP4000ZC, "tekpower-tp4000zc", "TekPower TP4000ZC")
	530	DRV(metex_me31, METEX_ME31, "metex-me31", "Metex ME-31")
	531	DRV(peaktech_3410, PEAKTECH_3410, "peaktech-3410", "PeakTech 3410")
	532	DRV(mastech_mas345, MASTECH_MAS345, "mastech-mas345", "MASTECH MAS345")
	533	DRV(va_va18b, VA_VA18B, "va-va18b", "V&A VA18B")
	534	DRV(metex_m3640d, METEX_M3640D, "metex-m3640d", "Metex M-3640D")
	535	DRV(peaktech_4370, PEAKTECH_4370, "peaktech-4370", "PeakTech 4370")
	536	DRV(pce_pce_dm32, PCE_PCE_DM32, "pce-pce-dm32", "PCE PCE-DM32")
	537	DRV(radioshack_22_168, RADIOSHACK_22_168, "radioshack-22-168", "RadioShack 22-168")
	538	DRV(radioshack_22_812, RADIOSHACK_22_812, "radioshack-22-812", "RadioShack 22-812")
	539	DRV(voltcraft_vc820_ser, VOLTCRAFT_VC820, "voltcraft-vc820-ser", "Voltcraft VC-820 (UT-D02 cable)")
	540	DRV(voltcraft_vc840_ser, VOLTCRAFT_VC840, "voltcraft-vc840-ser", "Voltcraft VC-840 (UT-D02 cable)")