[libsigrok.git] / hardware / chronovu-la8 / api.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2011-2012 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <ftdi.h>
#include <glib.h>
#include <string.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"

SR_PRIV struct sr_dev_driver chronovu_la8_driver_info;
static struct sr_dev_driver *di = &chronovu_la8_driver_info;

/* This will be initialized via config_list()/SR_CONF_SAMPLERATE.
 *
 * Min: 1 sample per 0.01us -> sample time is 0.084s, samplerate 100MHz
 * Max: 1 sample per 2.55us -> sample time is 21.391s, samplerate 392.15kHz
 */
SR_PRIV uint64_t chronovu_la8_samplerates[255 + 1] = { 0 };

/* Note: Continuous sampling is not supported by the hardware. */
SR_PRIV const int32_t chronovu_la8_hwcaps[] = {
	SR_CONF_LOGIC_ANALYZER,
	SR_CONF_SAMPLERATE,
	SR_CONF_LIMIT_MSEC, /* TODO: Not yet implemented. */
	SR_CONF_LIMIT_SAMPLES, /* TODO: Not yet implemented. */
};

/*
 * The ChronoVu LA8 can have multiple PIDs. Older versions shipped with
 * a standard FTDI USB VID/PID of 0403:6001, newer ones have 0403:8867.
 */ 
static const uint16_t usb_pids[] = {
	0x6001,
	0x8867,
};

/* Function prototypes. */
static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);

static int clear_instances(void)
{
	GSList *l;
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	struct dev_context *devc;

	drvc = di->priv;

	/* Properly close all devices. */
	for (l = drvc->instances; l; l = l->next) {
		if (!(sdi = l->data)) {
			/* Log error, but continue cleaning up the rest. */
			sr_err("%s: sdi was NULL, continuing.", __func__);
			continue;
		}
		if (sdi->priv) {
			devc = sdi->priv;
			ftdi_free(devc->ftdic);
		}
		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)
{
	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
}

static GSList *hw_scan(GSList *options)
{
	struct sr_dev_inst *sdi;
	struct sr_probe *probe;
	struct drv_context *drvc;
	struct dev_context *devc;
	GSList *devices;
	unsigned int i;
	int ret;

	(void)options;

	drvc = di->priv;

	devices = NULL;

	/* Allocate memory for our private device context. */
	if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
		sr_err("Device context malloc failed.");
		goto err_free_nothing;
	}

	/* Set some sane defaults. */
	devc->ftdic = NULL;
	devc->cur_samplerate = SR_MHZ(100); /* 100MHz == max. samplerate */
	devc->limit_msec = 0;
	devc->limit_samples = 0;
	devc->cb_data = NULL;
	memset(devc->mangled_buf, 0, BS);
	devc->final_buf = NULL;
	devc->trigger_pattern = 0x00; /* Value irrelevant, see trigger_mask. */
	devc->trigger_mask = 0x00; /* All probes are "don't care". */
	devc->trigger_timeout = 10; /* Default to 10s trigger timeout. */
	devc->trigger_found = 0;
	devc->done = 0;
	devc->block_counter = 0;
	devc->divcount = 0; /* 10ns sample period == 100MHz samplerate */
	devc->usb_pid = 0;

	/* Allocate memory where we'll store the de-mangled data. */
	if (!(devc->final_buf = g_try_malloc(SDRAM_SIZE))) {
		sr_err("final_buf malloc failed.");
		goto err_free_devc;
	}

	/* Allocate memory for the FTDI context (ftdic) and initialize it. */
	if (!(devc->ftdic = ftdi_new())) {
		sr_err("%s: ftdi_new failed.", __func__);
		goto err_free_final_buf;
	}

	/* Check for the device and temporarily open it. */
	for (i = 0; i < ARRAY_SIZE(usb_pids); i++) {
		sr_dbg("Probing for VID/PID %04x:%04x.", USB_VENDOR_ID,
		       usb_pids[i]);
		ret = ftdi_usb_open_desc(devc->ftdic, USB_VENDOR_ID,
					 usb_pids[i], USB_DESCRIPTION, NULL);
		if (ret == 0) {
			sr_dbg("Found LA8 device (%04x:%04x).",
			       USB_VENDOR_ID, usb_pids[i]);
			devc->usb_pid = usb_pids[i];
		}
	}

	if (devc->usb_pid == 0)
		goto err_free_ftdic;

	/* Register the device with libsigrok. */
	sdi = sr_dev_inst_new(0, SR_ST_INITIALIZING,
			USB_VENDOR_NAME, USB_MODEL_NAME, USB_MODEL_VERSION);
	if (!sdi) {
		sr_err("%s: sr_dev_inst_new failed.", __func__);
		goto err_close_ftdic;
	}
	sdi->driver = di;
	sdi->priv = devc;

	for (i = 0; chronovu_la8_probe_names[i]; i++) {
		if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE,
					   chronovu_la8_probe_names[i])))
			return NULL;
		sdi->probes = g_slist_append(sdi->probes, probe);
	}

	devices = g_slist_append(devices, sdi);
	drvc->instances = g_slist_append(drvc->instances, sdi);

	/* Close device. We'll reopen it again when we need it. */
	(void) la8_close(devc); /* Log, but ignore errors. */

	return devices;

err_close_ftdic:
	(void) la8_close(devc); /* Log, but ignore errors. */
err_free_ftdic:
	ftdi_free(devc->ftdic); /* NOT free() or g_free()! */
err_free_final_buf:
	g_free(devc->final_buf);
err_free_devc:
	g_free(devc);
err_free_nothing:

	return NULL;
}

static GSList *hw_dev_list(void)
{
	return ((struct drv_context *)(di->priv))->instances;
}

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

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

	sr_dbg("Opening LA8 device (%04x:%04x).", USB_VENDOR_ID,
	       devc->usb_pid);

	/* Open the device. */
	if ((ret = ftdi_usb_open_desc(devc->ftdic, USB_VENDOR_ID,
			devc->usb_pid, USB_DESCRIPTION, NULL)) < 0) {
		sr_err("%s: ftdi_usb_open_desc: (%d) %s",
		       __func__, ret, ftdi_get_error_string(devc->ftdic));
		(void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
		return SR_ERR;
	}
	sr_dbg("Device opened successfully.");

	/* Purge RX/TX buffers in the FTDI chip. */
	if ((ret = ftdi_usb_purge_buffers(devc->ftdic)) < 0) {
		sr_err("%s: ftdi_usb_purge_buffers: (%d) %s",
		       __func__, ret, ftdi_get_error_string(devc->ftdic));
		(void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
		goto err_dev_open_close_ftdic;
	}
	sr_dbg("FTDI buffers purged successfully.");

	/* Enable flow control in the FTDI chip. */
	if ((ret = ftdi_setflowctrl(devc->ftdic, SIO_RTS_CTS_HS)) < 0) {
		sr_err("%s: ftdi_setflowcontrol: (%d) %s",
		       __func__, ret, ftdi_get_error_string(devc->ftdic));
		(void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
		goto err_dev_open_close_ftdic;
	}
	sr_dbg("FTDI flow control enabled successfully.");

	/* Wait 100ms. */
	g_usleep(100 * 1000);

	sdi->status = SR_ST_ACTIVE;

	return SR_OK;

err_dev_open_close_ftdic:
	(void) la8_close(devc); /* Log, but ignore errors. */
	return SR_ERR;
}

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

	devc = sdi->priv;

	if (sdi->status == SR_ST_ACTIVE) {
		sr_dbg("Status ACTIVE, closing device.");
		(void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
	} else {
		sr_spew("Status not ACTIVE, nothing to do.");
	}

	sdi->status = SR_ST_INACTIVE;

	g_free(devc->final_buf);

	return SR_OK;
}

static int hw_cleanup(void)
{
	if (!di->priv)
		/* Can get called on an unused driver, doesn't matter. */
		return SR_OK;

	clear_instances();

	return SR_OK;
}

static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

	switch (id) {
	case SR_CONF_SAMPLERATE:
		if (sdi) {
			devc = sdi->priv;
			*data = g_variant_new_uint64(devc->cur_samplerate);
			sr_spew("%s: Returning samplerate: %" PRIu64 "Hz.",
				__func__, devc->cur_samplerate);
		} else
			return SR_ERR;
		break;
	default:
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

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

	switch (id) {
	case SR_CONF_SAMPLERATE:
		if (set_samplerate(sdi, g_variant_get_uint64(data)) == SR_ERR) {
			sr_err("%s: setting samplerate failed.", __func__);
			return SR_ERR;
		}
		sr_dbg("SAMPLERATE = %" PRIu64, devc->cur_samplerate);
		break;
	case SR_CONF_LIMIT_MSEC:
		if (g_variant_get_uint64(data) == 0) {
			sr_err("%s: LIMIT_MSEC can't be 0.", __func__);
			return SR_ERR;
		}
		devc->limit_msec = g_variant_get_uint64(data);
		sr_dbg("LIMIT_MSEC = %" PRIu64, devc->limit_msec);
		break;
	case SR_CONF_LIMIT_SAMPLES:
		if (g_variant_get_uint64(data) < MIN_NUM_SAMPLES) {
			sr_err("%s: LIMIT_SAMPLES too small.", __func__);
			return SR_ERR;
		}
		devc->limit_samples = g_variant_get_uint64(data);
		sr_dbg("LIMIT_SAMPLES = %" PRIu64, devc->limit_samples);
		break;
	default:
		/* Unknown capability, return SR_ERR. */
		sr_err("%s: Unknown capability: %d.", __func__, id);
		return SR_ERR;
		break;
	}

	return SR_OK;
}

static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
{
	GVariant *gvar;
	GVariantBuilder gvb;

	(void)sdi;

	switch (key) {
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				chronovu_la8_hwcaps, ARRAY_SIZE(chronovu_la8_hwcaps),
				sizeof(int32_t));
		break;
	case SR_CONF_SAMPLERATE:
		fill_supported_samplerates_if_needed();
		g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
		gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
				chronovu_la8_samplerates, ARRAY_SIZE(chronovu_la8_samplerates),
				sizeof(uint64_t));
		g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
		*data = g_variant_builder_end(&gvb);
		break;
	case SR_CONF_TRIGGER_TYPE:
		*data = g_variant_new_string(TRIGGER_TYPE);
		break;
	default:
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static int receive_data(int fd, int revents, void *cb_data)
{
	int i, ret;
	struct sr_dev_inst *sdi;
	struct dev_context *devc;

	(void)fd;
	(void)revents;

	if (!(sdi = cb_data)) {
		sr_err("%s: cb_data was NULL.", __func__);
		return FALSE;
	}

	if (!(devc = sdi->priv)) {
		sr_err("%s: sdi->priv was NULL.", __func__);
		return FALSE;
	}

	if (!devc->ftdic) {
		sr_err("%s: devc->ftdic was NULL.", __func__);
		return FALSE;
	}

	/* Get one block of data. */
	if ((ret = la8_read_block(devc)) < 0) {
		sr_err("%s: la8_read_block error: %d.", __func__, ret);
		hw_dev_acquisition_stop(sdi, sdi);
		return FALSE;
	}

	/* We need to get exactly NUM_BLOCKS blocks (i.e. 8MB) of data. */
	if (devc->block_counter != (NUM_BLOCKS - 1)) {
		devc->block_counter++;
		return TRUE;
	}

	sr_dbg("Sampling finished, sending data to session bus now.");

	/* All data was received and demangled, send it to the session bus. */
	for (i = 0; i < NUM_BLOCKS; i++)
		send_block_to_session_bus(devc, i);

	hw_dev_acquisition_stop(sdi, sdi);

	return TRUE;
}

static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
				    void *cb_data)
{
	struct dev_context *devc;
	uint8_t buf[4];
	int bytes_written;

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

	if (!devc->ftdic) {
		sr_err("%s: devc->ftdic was NULL.", __func__);
		return SR_ERR_BUG;
	}

	devc->divcount = samplerate_to_divcount(devc->cur_samplerate);
	if (devc->divcount == 0xff) {
		sr_err("%s: Invalid divcount/samplerate.", __func__);
		return SR_ERR;
	}

	if (configure_probes(sdi) != SR_OK) {
		sr_err("Failed to configure probes.");
		return SR_ERR;
	}

	/* Fill acquisition parameters into buf[]. */
	buf[0] = devc->divcount;
	buf[1] = 0xff; /* This byte must always be 0xff. */
	buf[2] = devc->trigger_pattern;
	buf[3] = devc->trigger_mask;

	/* Start acquisition. */
	bytes_written = la8_write(devc, buf, 4);

	if (bytes_written < 0) {
		sr_err("Acquisition failed to start: %d.", bytes_written);
		return SR_ERR;
	} else if (bytes_written != 4) {
		sr_err("Acquisition failed to start: %d.", bytes_written);
		return SR_ERR;
	}

	sr_dbg("Hardware acquisition started successfully.");

	devc->cb_data = cb_data;

	/* Send header packet to the session bus. */
	std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);

	/* Time when we should be done (for detecting trigger timeouts). */
	devc->done = (devc->divcount + 1) * 0.08388608 + time(NULL)
			+ devc->trigger_timeout;
	devc->block_counter = 0;
	devc->trigger_found = 0;

	/* Hook up a dummy handler to receive data from the LA8. */
	sr_source_add(-1, G_IO_IN, 0, 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;

	(void)sdi;

	sr_dbg("Stopping acquisition.");
	sr_source_remove(-1);

	/* 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;
}

SR_PRIV struct sr_dev_driver chronovu_la8_driver_info = {
	.name = "chronovu-la8",
	.longname = "ChronoVu LA8",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.scan = hw_scan,
	.dev_list = hw_dev_list,
	.dev_clear = clear_instances,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.dev_acquisition_start = hw_dev_acquisition_start,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
	.priv = NULL,
};
Commit	Line	Data
	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2011-2012 Uwe Hermann <uwe@hermann-uwe.de>
	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 2 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, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#include <ftdi.h>
	22	#include <glib.h>
	23	#include <string.h>
	24	#include "libsigrok.h"
	25	#include "libsigrok-internal.h"
	26	#include "protocol.h"
	27
	28	SR_PRIV struct sr_dev_driver chronovu_la8_driver_info;
	29	static struct sr_dev_driver *di = &chronovu_la8_driver_info;
	30
	31	/* This will be initialized via config_list()/SR_CONF_SAMPLERATE.
	32	*
	33	* Min: 1 sample per 0.01us -> sample time is 0.084s, samplerate 100MHz
	34	* Max: 1 sample per 2.55us -> sample time is 21.391s, samplerate 392.15kHz
	35	*/
	36	SR_PRIV uint64_t chronovu_la8_samplerates[255 + 1] = { 0 };
	37
	38	/* Note: Continuous sampling is not supported by the hardware. */
	39	SR_PRIV const int32_t chronovu_la8_hwcaps[] = {
	40	SR_CONF_LOGIC_ANALYZER,
	41	SR_CONF_SAMPLERATE,
	42	SR_CONF_LIMIT_MSEC, /* TODO: Not yet implemented. */
	43	SR_CONF_LIMIT_SAMPLES, /* TODO: Not yet implemented. */
	44	};
	45
	46	/*
	47	* The ChronoVu LA8 can have multiple PIDs. Older versions shipped with
	48	* a standard FTDI USB VID/PID of 0403:6001, newer ones have 0403:8867.
	49	*/
	50	static const uint16_t usb_pids[] = {
	51	0x6001,
	52	0x8867,
	53	};
	54
	55	/* Function prototypes. */
	56	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data);
	57
	58	static int clear_instances(void)
	59	{
	60	GSList *l;
	61	struct sr_dev_inst *sdi;
	62	struct drv_context *drvc;
	63	struct dev_context *devc;
	64
	65	drvc = di->priv;
	66
	67	/* Properly close all devices. */
	68	for (l = drvc->instances; l; l = l->next) {
	69	if (!(sdi = l->data)) {
	70	/* Log error, but continue cleaning up the rest. */
	71	sr_err("%s: sdi was NULL, continuing.", __func__);
	72	continue;
	73	}
	74	if (sdi->priv) {
	75	devc = sdi->priv;
	76	ftdi_free(devc->ftdic);
	77	}
	78	sr_dev_inst_free(sdi);
	79	}
	80	g_slist_free(drvc->instances);
	81	drvc->instances = NULL;
	82
	83	return SR_OK;
	84	}
	85
	86	static int hw_init(struct sr_context *sr_ctx)
	87	{
	88	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
	89	}
	90
	91	static GSList hw_scan(GSList options)
	92	{
	93	struct sr_dev_inst *sdi;
	94	struct sr_probe *probe;
	95	struct drv_context *drvc;
	96	struct dev_context *devc;
	97	GSList *devices;
	98	unsigned int i;
	99	int ret;
	100
	101	(void)options;
	102
	103	drvc = di->priv;
	104
	105	devices = NULL;
	106
	107	/* Allocate memory for our private device context. */
	108	if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
	109	sr_err("Device context malloc failed.");
	110	goto err_free_nothing;
	111	}
	112
	113	/* Set some sane defaults. */
	114	devc->ftdic = NULL;
	115	devc->cur_samplerate = SR_MHZ(100); /* 100MHz == max. samplerate */
	116	devc->limit_msec = 0;
	117	devc->limit_samples = 0;
	118	devc->cb_data = NULL;
	119	memset(devc->mangled_buf, 0, BS);
	120	devc->final_buf = NULL;
	121	devc->trigger_pattern = 0x00; /* Value irrelevant, see trigger_mask. */
	122	devc->trigger_mask = 0x00; /* All probes are "don't care". */
	123	devc->trigger_timeout = 10; /* Default to 10s trigger timeout. */
	124	devc->trigger_found = 0;
	125	devc->done = 0;
	126	devc->block_counter = 0;
	127	devc->divcount = 0; /* 10ns sample period == 100MHz samplerate */
	128	devc->usb_pid = 0;
	129
	130	/* Allocate memory where we'll store the de-mangled data. */
	131	if (!(devc->final_buf = g_try_malloc(SDRAM_SIZE))) {
	132	sr_err("final_buf malloc failed.");
	133	goto err_free_devc;
	134	}
	135
	136	/* Allocate memory for the FTDI context (ftdic) and initialize it. */
	137	if (!(devc->ftdic = ftdi_new())) {
	138	sr_err("%s: ftdi_new failed.", __func__);
	139	goto err_free_final_buf;
	140	}
	141
	142	/* Check for the device and temporarily open it. */
	143	for (i = 0; i < ARRAY_SIZE(usb_pids); i++) {
	144	sr_dbg("Probing for VID/PID %04x:%04x.", USB_VENDOR_ID,
	145	usb_pids[i]);
	146	ret = ftdi_usb_open_desc(devc->ftdic, USB_VENDOR_ID,
	147	usb_pids[i], USB_DESCRIPTION, NULL);
	148	if (ret == 0) {
	149	sr_dbg("Found LA8 device (%04x:%04x).",
	150	USB_VENDOR_ID, usb_pids[i]);
	151	devc->usb_pid = usb_pids[i];
	152	}
	153	}
	154
	155	if (devc->usb_pid == 0)
	156	goto err_free_ftdic;
	157
	158	/* Register the device with libsigrok. */
	159	sdi = sr_dev_inst_new(0, SR_ST_INITIALIZING,
	160	USB_VENDOR_NAME, USB_MODEL_NAME, USB_MODEL_VERSION);
	161	if (!sdi) {
	162	sr_err("%s: sr_dev_inst_new failed.", __func__);
	163	goto err_close_ftdic;
	164	}
	165	sdi->driver = di;
	166	sdi->priv = devc;
	167
	168	for (i = 0; chronovu_la8_probe_names[i]; i++) {
	169	if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE,
	170	chronovu_la8_probe_names[i])))
	171	return NULL;
	172	sdi->probes = g_slist_append(sdi->probes, probe);
	173	}
	174
	175	devices = g_slist_append(devices, sdi);
	176	drvc->instances = g_slist_append(drvc->instances, sdi);
	177
	178	/* Close device. We'll reopen it again when we need it. */
	179	(void) la8_close(devc); /* Log, but ignore errors. */
	180
	181	return devices;
	182
	183	err_close_ftdic:
	184	(void) la8_close(devc); /* Log, but ignore errors. */
	185	err_free_ftdic:
	186	ftdi_free(devc->ftdic); /* NOT free() or g_free()! */
	187	err_free_final_buf:
	188	g_free(devc->final_buf);
	189	err_free_devc:
	190	g_free(devc);
	191	err_free_nothing:
	192
	193	return NULL;
	194	}
	195
	196	static GSList *hw_dev_list(void)
	197	{
	198	return ((struct drv_context *)(di->priv))->instances;
	199	}
	200
	201	static int hw_dev_open(struct sr_dev_inst *sdi)
	202	{
	203	struct dev_context *devc;
	204	int ret;
	205
	206	if (!(devc = sdi->priv)) {
	207	sr_err("%s: sdi->priv was NULL.", __func__);
	208	return SR_ERR_BUG;
	209	}
	210
	211	sr_dbg("Opening LA8 device (%04x:%04x).", USB_VENDOR_ID,
	212	devc->usb_pid);
	213
	214	/* Open the device. */
	215	if ((ret = ftdi_usb_open_desc(devc->ftdic, USB_VENDOR_ID,
	216	devc->usb_pid, USB_DESCRIPTION, NULL)) < 0) {
	217	sr_err("%s: ftdi_usb_open_desc: (%d) %s",
	218	__func__, ret, ftdi_get_error_string(devc->ftdic));
	219	(void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
	220	return SR_ERR;
	221	}
	222	sr_dbg("Device opened successfully.");
	223
	224	/* Purge RX/TX buffers in the FTDI chip. */
	225	if ((ret = ftdi_usb_purge_buffers(devc->ftdic)) < 0) {
	226	sr_err("%s: ftdi_usb_purge_buffers: (%d) %s",
	227	__func__, ret, ftdi_get_error_string(devc->ftdic));
	228	(void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
	229	goto err_dev_open_close_ftdic;
	230	}
	231	sr_dbg("FTDI buffers purged successfully.");
	232
	233	/* Enable flow control in the FTDI chip. */
	234	if ((ret = ftdi_setflowctrl(devc->ftdic, SIO_RTS_CTS_HS)) < 0) {
	235	sr_err("%s: ftdi_setflowcontrol: (%d) %s",
	236	__func__, ret, ftdi_get_error_string(devc->ftdic));
	237	(void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
	238	goto err_dev_open_close_ftdic;
	239	}
	240	sr_dbg("FTDI flow control enabled successfully.");
	241
	242	/* Wait 100ms. */
	243	g_usleep(100 * 1000);
	244
	245	sdi->status = SR_ST_ACTIVE;
	246
	247	return SR_OK;
	248
	249	err_dev_open_close_ftdic:
	250	(void) la8_close(devc); /* Log, but ignore errors. */
	251	return SR_ERR;
	252	}
	253
	254	static int hw_dev_close(struct sr_dev_inst *sdi)
	255	{
	256	struct dev_context *devc;
	257
	258	devc = sdi->priv;
	259
	260	if (sdi->status == SR_ST_ACTIVE) {
	261	sr_dbg("Status ACTIVE, closing device.");
	262	(void) la8_close_usb_reset_sequencer(devc); /* Ignore errors. */
	263	} else {
	264	sr_spew("Status not ACTIVE, nothing to do.");
	265	}
	266
	267	sdi->status = SR_ST_INACTIVE;
	268
	269	g_free(devc->final_buf);
	270
	271	return SR_OK;
	272	}
	273
	274	static int hw_cleanup(void)
	275	{
	276	if (!di->priv)
	277	/* Can get called on an unused driver, doesn't matter. */
	278	return SR_OK;
	279
	280	clear_instances();
	281
	282	return SR_OK;
	283	}
	284
	285	static int config_get(int id, GVariant *data, const struct sr_dev_inst sdi)
	286	{
	287	struct dev_context *devc;
	288
	289	switch (id) {
	290	case SR_CONF_SAMPLERATE:
	291	if (sdi) {
	292	devc = sdi->priv;
	293	*data = g_variant_new_uint64(devc->cur_samplerate);
	294	sr_spew("%s: Returning samplerate: %" PRIu64 "Hz.",
	295	__func__, devc->cur_samplerate);
	296	} else
	297	return SR_ERR;
	298	break;
	299	default:
	300	return SR_ERR_ARG;
	301	}
	302
	303	return SR_OK;
	304	}
	305
	306	static int config_set(int id, GVariant data, const struct sr_dev_inst sdi)
	307	{
	308	struct dev_context *devc;
	309
	310	if (!(devc = sdi->priv)) {
	311	sr_err("%s: sdi->priv was NULL.", __func__);
	312	return SR_ERR_BUG;
	313	}
	314
	315	switch (id) {
	316	case SR_CONF_SAMPLERATE:
	317	if (set_samplerate(sdi, g_variant_get_uint64(data)) == SR_ERR) {
	318	sr_err("%s: setting samplerate failed.", __func__);
	319	return SR_ERR;
	320	}
	321	sr_dbg("SAMPLERATE = %" PRIu64, devc->cur_samplerate);
	322	break;
	323	case SR_CONF_LIMIT_MSEC:
	324	if (g_variant_get_uint64(data) == 0) {
	325	sr_err("%s: LIMIT_MSEC can't be 0.", __func__);
	326	return SR_ERR;
	327	}
	328	devc->limit_msec = g_variant_get_uint64(data);
	329	sr_dbg("LIMIT_MSEC = %" PRIu64, devc->limit_msec);
	330	break;
	331	case SR_CONF_LIMIT_SAMPLES:
	332	if (g_variant_get_uint64(data) < MIN_NUM_SAMPLES) {
	333	sr_err("%s: LIMIT_SAMPLES too small.", __func__);
	334	return SR_ERR;
	335	}
	336	devc->limit_samples = g_variant_get_uint64(data);
	337	sr_dbg("LIMIT_SAMPLES = %" PRIu64, devc->limit_samples);
	338	break;
	339	default:
	340	/* Unknown capability, return SR_ERR. */
	341	sr_err("%s: Unknown capability: %d.", __func__, id);
	342	return SR_ERR;
	343	break;
	344	}
	345
	346	return SR_OK;
	347	}
	348
	349	static int config_list(int key, GVariant *data, const struct sr_dev_inst sdi)
	350	{
	351	GVariant *gvar;
	352	GVariantBuilder gvb;
	353
	354	(void)sdi;
	355
	356	switch (key) {
	357	case SR_CONF_DEVICE_OPTIONS:
	358	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	359	chronovu_la8_hwcaps, ARRAY_SIZE(chronovu_la8_hwcaps),
	360	sizeof(int32_t));
	361	break;
	362	case SR_CONF_SAMPLERATE:
	363	fill_supported_samplerates_if_needed();
	364	g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
	365	gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
	366	chronovu_la8_samplerates, ARRAY_SIZE(chronovu_la8_samplerates),
	367	sizeof(uint64_t));
	368	g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
	369	*data = g_variant_builder_end(&gvb);
	370	break;
	371	case SR_CONF_TRIGGER_TYPE:
	372	*data = g_variant_new_string(TRIGGER_TYPE);
	373	break;
	374	default:
	375	return SR_ERR_ARG;
	376	}
	377
	378	return SR_OK;
	379	}
	380
	381	static int receive_data(int fd, int revents, void *cb_data)
	382	{
	383	int i, ret;
	384	struct sr_dev_inst *sdi;
	385	struct dev_context *devc;
	386
	387	(void)fd;
	388	(void)revents;
	389
	390	if (!(sdi = cb_data)) {
	391	sr_err("%s: cb_data was NULL.", __func__);
	392	return FALSE;
	393	}
	394
	395	if (!(devc = sdi->priv)) {
	396	sr_err("%s: sdi->priv was NULL.", __func__);
	397	return FALSE;
	398	}
	399
	400	if (!devc->ftdic) {
	401	sr_err("%s: devc->ftdic was NULL.", __func__);
	402	return FALSE;
	403	}
	404
	405	/* Get one block of data. */
	406	if ((ret = la8_read_block(devc)) < 0) {
	407	sr_err("%s: la8_read_block error: %d.", __func__, ret);
	408	hw_dev_acquisition_stop(sdi, sdi);
	409	return FALSE;
	410	}
	411
	412	/* We need to get exactly NUM_BLOCKS blocks (i.e. 8MB) of data. */
	413	if (devc->block_counter != (NUM_BLOCKS - 1)) {
	414	devc->block_counter++;
	415	return TRUE;
	416	}
	417
	418	sr_dbg("Sampling finished, sending data to session bus now.");
	419
	420	/* All data was received and demangled, send it to the session bus. */
	421	for (i = 0; i < NUM_BLOCKS; i++)
	422	send_block_to_session_bus(devc, i);
	423
	424	hw_dev_acquisition_stop(sdi, sdi);
	425
	426	return TRUE;
	427	}
	428
	429	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	430	void *cb_data)
	431	{
	432	struct dev_context *devc;
	433	uint8_t buf[4];
	434	int bytes_written;
	435
	436	if (!(devc = sdi->priv)) {
	437	sr_err("%s: sdi->priv was NULL.", __func__);
	438	return SR_ERR_BUG;
	439	}
	440
	441	if (!devc->ftdic) {
	442	sr_err("%s: devc->ftdic was NULL.", __func__);
	443	return SR_ERR_BUG;
	444	}
	445
	446	devc->divcount = samplerate_to_divcount(devc->cur_samplerate);
	447	if (devc->divcount == 0xff) {
	448	sr_err("%s: Invalid divcount/samplerate.", __func__);
	449	return SR_ERR;
	450	}
	451
	452	if (configure_probes(sdi) != SR_OK) {
	453	sr_err("Failed to configure probes.");
	454	return SR_ERR;
	455	}
	456
	457	/* Fill acquisition parameters into buf[]. */
	458	buf[0] = devc->divcount;
	459	buf[1] = 0xff; /* This byte must always be 0xff. */
	460	buf[2] = devc->trigger_pattern;
	461	buf[3] = devc->trigger_mask;
	462
	463	/* Start acquisition. */
	464	bytes_written = la8_write(devc, buf, 4);
	465
	466	if (bytes_written < 0) {
	467	sr_err("Acquisition failed to start: %d.", bytes_written);
	468	return SR_ERR;
	469	} else if (bytes_written != 4) {
	470	sr_err("Acquisition failed to start: %d.", bytes_written);
	471	return SR_ERR;
	472	}
	473
	474	sr_dbg("Hardware acquisition started successfully.");
	475
	476	devc->cb_data = cb_data;
	477
	478	/* Send header packet to the session bus. */
	479	std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
	480
	481	/* Time when we should be done (for detecting trigger timeouts). */
	482	devc->done = (devc->divcount + 1) * 0.08388608 + time(NULL)
	483	+ devc->trigger_timeout;
	484	devc->block_counter = 0;
	485	devc->trigger_found = 0;
	486
	487	/* Hook up a dummy handler to receive data from the LA8. */
	488	sr_source_add(-1, G_IO_IN, 0, receive_data, (void *)sdi);
	489
	490	return SR_OK;
	491	}
	492
	493	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	494	{
	495	struct sr_datafeed_packet packet;
	496
	497	(void)sdi;
	498
	499	sr_dbg("Stopping acquisition.");
	500	sr_source_remove(-1);
	501
	502	/* Send end packet to the session bus. */
	503	sr_dbg("Sending SR_DF_END.");
	504	packet.type = SR_DF_END;
	505	sr_session_send(cb_data, &packet);
	506
	507	return SR_OK;
	508	}
	509
	510	SR_PRIV struct sr_dev_driver chronovu_la8_driver_info = {
	511	.name = "chronovu-la8",
	512	.longname = "ChronoVu LA8",
	513	.api_version = 1,
	514	.init = hw_init,
	515	.cleanup = hw_cleanup,
	516	.scan = hw_scan,
	517	.dev_list = hw_dev_list,
	518	.dev_clear = clear_instances,
	519	.config_get = config_get,
	520	.config_set = config_set,
	521	.config_list = config_list,
	522	.dev_open = hw_dev_open,
	523	.dev_close = hw_dev_close,
	524	.dev_acquisition_start = hw_dev_acquisition_start,
	525	.dev_acquisition_stop = hw_dev_acquisition_stop,
	526	.priv = NULL,
	527	};