/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2010-2012 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <inttypes.h>
#include <glib.h>
#include <libusb.h>
#include "config.h"
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "analyzer.h"

#define USB_VENDOR			0x0c12

#define VENDOR_NAME			"ZEROPLUS"
#define MODEL_NAME			"Logic Cube LAP-C"
#define MODEL_VERSION			NULL

#define NUM_PROBES			16
#define USB_INTERFACE			0
#define USB_CONFIGURATION		1
#define NUM_TRIGGER_STAGES		4
#define TRIGGER_TYPES			"01"

#define PACKET_SIZE			2048	/* ?? */

typedef struct {
	unsigned short vid;
	unsigned short pid;
	char *model_name;
	unsigned int channels;
	unsigned int sample_depth;	/* In Ksamples/channel */
	unsigned int max_sampling_freq;
} model_t;

/*
 * Note -- 16032, 16064 and 16128 *usually* -- but not always -- have the
 * same 128K sample depth.
 */
static model_t zeroplus_models[] = {
	{0x0c12, 0x7009, "LAP-C(16064)",  16, 64,   100},
	{0x0c12, 0x700A, "LAP-C(16128)",  16, 128,  200},
	/* TODO: we don't know anything about these
	{0x0c12, 0x700B, "LAP-C(32128)",  32, 128,  200},
	{0x0c12, 0x700C, "LAP-C(321000)", 32, 1024, 200},
	{0x0c12, 0x700D, "LAP-C(322000)", 32, 2048, 200},
	*/
	{0x0c12, 0x700E, "LAP-C(16032)",  16, 32,   100},
	{0x0c12, 0x7016, "LAP-C(162000)", 16, 2048, 200},
	{ 0, 0, 0, 0, 0, 0 }
};

static const int hwcaps[] = {
	SR_HWCAP_LOGIC_ANALYZER,
	SR_HWCAP_SAMPLERATE,
	SR_HWCAP_CAPTURE_RATIO,

	/* These are really implemented in the driver, not the hardware. */
	SR_HWCAP_LIMIT_SAMPLES,
	0,
};

/*
 * ZEROPLUS LAP-C (16032) numbers the 16 probes A0-A7 and B0-B7.
 * We currently ignore other untested/unsupported devices here.
 */
static const char *probe_names[NUM_PROBES + 1] = {
	"A0",
	"A1",
	"A2",
	"A3",
	"A4",
	"A5",
	"A6",
	"A7",
	"B0",
	"B1",
	"B2",
	"B3",
	"B4",
	"B5",
	"B6",
	"B7",
	NULL,
};

/* List of struct sr_dev_inst, maintained by dev_open()/dev_close(). */
SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info;
static struct sr_dev_driver *zdi = &zeroplus_logic_cube_driver_info;

static libusb_context *usb_context = NULL;

/*
 * The hardware supports more samplerates than these, but these are the
 * options hardcoded into the vendor's Windows GUI.
 */

/*
 * TODO: We shouldn't support 150MHz and 200MHz on devices that don't go up
 * that high.
 */
static const uint64_t supported_samplerates[] = {
	SR_HZ(100),
	SR_HZ(500),
	SR_KHZ(1),
	SR_KHZ(5),
	SR_KHZ(25),
	SR_KHZ(50),
	SR_KHZ(100),
	SR_KHZ(200),
	SR_KHZ(400),
	SR_KHZ(800),
	SR_MHZ(1),
	SR_MHZ(10),
	SR_MHZ(25),
	SR_MHZ(50),
	SR_MHZ(80),
	SR_MHZ(100),
	SR_MHZ(150),
	SR_MHZ(200),
	0,
};

static const struct sr_samplerates samplerates = {
	0,
	0,
	0,
	supported_samplerates,
};

/* Private, per-device-instance driver context. */
struct dev_context {
	uint64_t cur_samplerate;
	uint64_t limit_samples;
	int num_channels; /* TODO: This isn't initialized before it's needed :( */
	uint64_t memory_size;
	uint8_t probe_mask;
	uint8_t trigger_mask[NUM_TRIGGER_STAGES];
	uint8_t trigger_value[NUM_TRIGGER_STAGES];
	// uint8_t trigger_buffer[NUM_TRIGGER_STAGES];

	/* TODO: this belongs in the device instance */
	struct sr_usb_dev_inst *usb;
};

static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
		const void *value);
static int hw_dev_close(struct sr_dev_inst *sdi);

static unsigned int get_memory_size(int type)
{
	if (type == MEMORY_SIZE_8K)
		return 8 * 1024;
	else if (type == MEMORY_SIZE_64K)
		return 64 * 1024;
	else if (type == MEMORY_SIZE_128K)
		return 128 * 1024;
	else if (type == MEMORY_SIZE_512K)
		return 512 * 1024;
	else
		return 0;
}

static int configure_probes(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	const struct sr_probe *probe;
	const GSList *l;
	int probe_bit, stage, i;
	char *tc;

	/* Note: sdi and sdi->priv are non-NULL, the caller checked this. */
	devc = sdi->priv;

	devc->probe_mask = 0;
	for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
		devc->trigger_mask[i] = 0;
		devc->trigger_value[i] = 0;
	}

	stage = -1;
	for (l = sdi->probes; l; l = l->next) {
		probe = (struct sr_probe *)l->data;
		if (probe->enabled == FALSE)
			continue;
		probe_bit = 1 << (probe->index);
		devc->probe_mask |= probe_bit;

		if (probe->trigger) {
			stage = 0;
			for (tc = probe->trigger; *tc; tc++) {
				devc->trigger_mask[stage] |= probe_bit;
				if (*tc == '1')
					devc->trigger_value[stage] |= probe_bit;
				stage++;
				if (stage > NUM_TRIGGER_STAGES)
					return SR_ERR;
			}
		}
	}

	return SR_OK;
}

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

	drvc = zdi->priv;
	for (l = drvc->instances; l; l = l->next) {
		sdi = l->data;
		if (!(devc = sdi->priv)) {
			/* Log error, but continue cleaning up the rest. */
			sr_err("zeroplus: %s: sdi->priv was NULL, continuing", __func__);
			continue;
		}
		sr_usb_dev_inst_free(devc->usb);
		/* Properly close all devices... */
		hw_dev_close(sdi);
		/* ...and free all their memory. */
		sr_dev_inst_free(sdi);
	}
	g_slist_free(drvc->instances);
	drvc->instances = NULL;

	return SR_OK;
}

/*
 * API callbacks
 */

static int hw_init(void)
{
	struct drv_context *drvc;

	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
		sr_err("zeroplus: driver context malloc failed.");
		return SR_ERR;
	}
	zdi->priv = drvc;

	if (libusb_init(&usb_context) != 0) {
		sr_err("zp: Failed to initialize USB.");
		return 0;
	}

	return SR_OK;
}

static GSList *hw_scan(GSList *options)
{
	struct sr_dev_inst *sdi;
	struct sr_probe *probe;
	struct drv_context *drvc;
	struct dev_context *devc;
	model_t *prof;
	struct libusb_device_descriptor des;
	libusb_device **devlist;
	GSList *devices;
	int ret, devcnt, i, j;

	(void)options;
	drvc = zdi->priv;
	devices = NULL;

	clear_instances();

	/* Find all ZEROPLUS analyzers and add them to device list. */
	devcnt = 0;
	libusb_get_device_list(usb_context, &devlist); /* TODO: Errors. */

	for (i = 0; devlist[i]; i++) {
		ret = libusb_get_device_descriptor(devlist[i], &des);
		if (ret != 0) {
			sr_err("zp: failed to get device descriptor: %d", ret);
			continue;
		}

		prof = NULL;
		for (j = 0; j < zeroplus_models[j].vid; j++) {
			if (des.idVendor == zeroplus_models[j].vid &&
				des.idProduct == zeroplus_models[j].pid) {
				prof = &zeroplus_models[j];
			}
		}
		/* Skip if the device was not found */
		if (!prof)
			continue;
		sr_info("zp: Found ZEROPLUS model %s", prof->model_name);

		/* Register the device with libsigrok. */
		if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
				VENDOR_NAME, prof->model_name, NULL))) {
			sr_err("zp: %s: sr_dev_inst_new failed", __func__);
			return NULL;
		}
		sdi->driver = zdi;

		/* Allocate memory for our private driver context. */
		if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
			sr_err("zp: %s: devc malloc failed", __func__);
			return 0;
		}
		sdi->priv = devc;
		devc->num_channels = prof->channels;
		devc->memory_size = prof->sample_depth * 1024;
		// memset(devc->trigger_buffer, 0, NUM_TRIGGER_STAGES);

		/* Fill in probelist according to this device's profile. */
		for (j = 0; j < devc->num_channels; j++) {
			if (!(probe = sr_probe_new(j, SR_PROBE_LOGIC, TRUE,
					probe_names[j])))
				return NULL;
			sdi->probes = g_slist_append(sdi->probes, probe);
		}

		devices = g_slist_append(devices, sdi);
		drvc->instances = g_slist_append(drvc->instances, sdi);
		devc->usb = sr_usb_dev_inst_new(
			libusb_get_bus_number(devlist[i]),
			libusb_get_device_address(devlist[i]), NULL);
		devcnt++;

	}
	libusb_free_device_list(devlist, 1);

	return devices;
}

static GSList *hw_dev_list(void)
{
	struct drv_context *drvc;

	drvc = zdi->priv;

	return drvc->instances;
}

static int hw_dev_open(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	libusb_device **devlist, *dev;
	struct libusb_device_descriptor des;
	int device_count, ret, i;

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

	device_count = libusb_get_device_list(usb_context, &devlist);
	if (device_count < 0) {
		sr_err("zp: Failed to retrieve device list");
		return SR_ERR;
	}

	dev = NULL;
	for (i = 0; i < device_count; i++) {
		if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
			sr_err("fx2lafw: Failed to get device descriptor: %d.",
			       ret);
			continue;
		}
		if (libusb_get_bus_number(devlist[i]) == devc->usb->bus
		    && libusb_get_device_address(devlist[i]) == devc->usb->address) {
			dev = devlist[i];
			break;
		}
	}
	if (!dev) {
		sr_err("device on bus %d address %d disappeared!",
				devc->usb->bus, devc->usb->address);
		return SR_ERR;
	}

	if (!(ret = libusb_open(dev, &(devc->usb->devhdl)))) {
		sdi->status = SR_ST_ACTIVE;
		sr_info("zp: opened device %d on %d.%d interface %d",
			sdi->index, devc->usb->bus,
			devc->usb->address, USB_INTERFACE);
	} else {
		sr_err("zp: failed to open device: %d", ret);
		return SR_ERR;
	}

	ret = libusb_set_configuration(devc->usb->devhdl, USB_CONFIGURATION);
	if (ret < 0) {
		sr_err("zp: Unable to set USB configuration %d: %d",
		       USB_CONFIGURATION, ret);
		return SR_ERR;
	}

	ret = libusb_claim_interface(devc->usb->devhdl, USB_INTERFACE);
	if (ret != 0) {
		sr_err("zp: Unable to claim interface: %d", ret);
		return SR_ERR;
	}

	analyzer_reset(devc->usb->devhdl);
	analyzer_initialize(devc->usb->devhdl);

	analyzer_set_memory_size(MEMORY_SIZE_512K);
	// analyzer_set_freq(g_freq, g_freq_scale);
	analyzer_set_trigger_count(1);
	// analyzer_set_ramsize_trigger_address((((100 - g_pre_trigger)
	// * get_memory_size(g_memory_size)) / 100) >> 2);
	analyzer_set_ramsize_trigger_address(
		(100 * get_memory_size(MEMORY_SIZE_512K) / 100) >> 2);

#if 0
	if (g_double_mode == 1)
		analyzer_set_compression(COMPRESSION_DOUBLE);
	else if (g_compression == 1)
		analyzer_set_compression(COMPRESSION_ENABLE);
	else
#endif
	analyzer_set_compression(COMPRESSION_NONE);

	if (devc->cur_samplerate == 0) {
		/* Samplerate hasn't been set. Default to the slowest one. */
		if (hw_dev_config_set(sdi, SR_HWCAP_SAMPLERATE,
		     &samplerates.list[0]) == SR_ERR)
			return SR_ERR;
	}

	return SR_OK;
}

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

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

	if (!devc->usb->devhdl)
		return SR_ERR;

	sr_info("zp: closing device %d on %d.%d interface %d", sdi->index,
		devc->usb->bus, devc->usb->address, USB_INTERFACE);
	libusb_release_interface(devc->usb->devhdl, USB_INTERFACE);
	libusb_reset_device(devc->usb->devhdl);
	libusb_close(devc->usb->devhdl);
	devc->usb->devhdl = NULL;
	sdi->status = SR_ST_INACTIVE;

	return SR_OK;
}

static int hw_cleanup(void)
{
	struct drv_context *drvc;

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

	clear_instances();

	if (usb_context)
		libusb_exit(usb_context);
	usb_context = NULL;

	return SR_OK;
}

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

	switch (info_id) {
	case SR_DI_HWCAPS:
		*data = hwcaps;
		break;
	case SR_DI_NUM_PROBES:
		if (sdi) {
			devc = sdi->priv;
			*data = GINT_TO_POINTER(devc->num_channels);
			sr_spew("zp: %s: Returning number of channels: %d.",
					__func__, devc->num_channels);
		} else
			return SR_ERR;
		break;
	case SR_DI_PROBE_NAMES:
		*data = probe_names;
		sr_spew("zp: %s: Returning probenames.", __func__);
		break;
	case SR_DI_SAMPLERATES:
		*data = &samplerates;
		sr_spew("zp: %s: Returning samplerates.", __func__);
		break;
	case SR_DI_TRIGGER_TYPES:
		*data = TRIGGER_TYPES;
		sr_spew("zp: %s: Returning triggertypes: %s.", __func__, TRIGGER_TYPES);
		break;
	case SR_DI_CUR_SAMPLERATE:
		if (sdi) {
			devc = sdi->priv;
			*data = &devc->cur_samplerate;
			sr_spew("zp: %s: Returning samplerate: %" PRIu64 "Hz.",
				__func__, devc->cur_samplerate);
		} else
			return SR_ERR;
		break;
	default:
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static int set_samplerate(const struct sr_dev_inst *sdi, uint64_t samplerate)
{
	struct dev_context *devc;

	if (!sdi) {
		sr_err("zp: %s: sdi was NULL", __func__);
		return SR_ERR_ARG;
	}

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

	sr_info("zp: Setting samplerate to %" PRIu64 "Hz.", samplerate);

	if (samplerate > SR_MHZ(1))
		analyzer_set_freq(samplerate / SR_MHZ(1), FREQ_SCALE_MHZ);
	else if (samplerate > SR_KHZ(1))
		analyzer_set_freq(samplerate / SR_KHZ(1), FREQ_SCALE_KHZ);
	else
		analyzer_set_freq(samplerate, FREQ_SCALE_HZ);

	devc->cur_samplerate = samplerate;

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

	switch (hwcap) {
	case SR_HWCAP_SAMPLERATE:
		return set_samplerate(sdi, *(const uint64_t *)value);
	case SR_HWCAP_LIMIT_SAMPLES:
		devc->limit_samples = *(const uint64_t *)value;
		return SR_OK;
	default:
		return SR_ERR;
	}
}

static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
		void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_logic logic;
	struct sr_datafeed_header header;
	struct sr_datafeed_meta_logic meta;
	uint64_t samples_read;
	int res;
	unsigned int packet_num;
	unsigned char *buf;
	struct dev_context *devc;

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

	if (configure_probes(sdi) != SR_OK) {
		sr_err("zp: failed to configured probes");
		return SR_ERR;
	}

	/* push configured settings to device */
	analyzer_configure(devc->usb->devhdl);

	analyzer_start(devc->usb->devhdl);
	sr_info("zp: Waiting for data");
	analyzer_wait_data(devc->usb->devhdl);

	sr_info("zp: Stop address    = 0x%x",
		analyzer_get_stop_address(devc->usb->devhdl));
	sr_info("zp: Now address     = 0x%x",
		analyzer_get_now_address(devc->usb->devhdl));
	sr_info("zp: Trigger address = 0x%x",
		analyzer_get_trigger_address(devc->usb->devhdl));

	packet.type = SR_DF_HEADER;
	packet.payload = &header;
	header.feed_version = 1;
	gettimeofday(&header.starttime, NULL);
	sr_session_send(cb_data, &packet);

	/* Send metadata about the SR_DF_LOGIC packets to come. */
	packet.type = SR_DF_META_LOGIC;
	packet.payload = &meta;
	meta.samplerate = devc->cur_samplerate;
	meta.num_probes = devc->num_channels;
	sr_session_send(cb_data, &packet);

	if (!(buf = g_try_malloc(PACKET_SIZE))) {
		sr_err("zp: %s: buf malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	samples_read = 0;
	analyzer_read_start(devc->usb->devhdl);
	/* Send the incoming transfer to the session bus. */
	for (packet_num = 0; packet_num < (devc->memory_size * 4 / PACKET_SIZE);
	     packet_num++) {
		res = analyzer_read_data(devc->usb->devhdl, buf, PACKET_SIZE);
		sr_info("zp: Tried to read %llx bytes, actually read %x bytes",
			PACKET_SIZE, res);

		packet.type = SR_DF_LOGIC;
		packet.payload = &logic;
		logic.length = PACKET_SIZE;
		logic.unitsize = 4;
		logic.data = buf;
		sr_session_send(cb_data, &packet);
		samples_read += res / 4;
	}
	analyzer_read_stop(devc->usb->devhdl);
	g_free(buf);

	packet.type = SR_DF_END;
	sr_session_send(cb_data, &packet);

	return SR_OK;
}

/* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
		void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct dev_context *devc;

	packet.type = SR_DF_END;
	sr_session_send(cb_data, &packet);

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

	analyzer_reset(devc->usb->devhdl);
	/* TODO: Need to cancel and free any queued up transfers. */

	return SR_OK;
}

SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info = {
	.name = "zeroplus-logic-cube",
	.longname = "ZEROPLUS Logic Cube LAP-C series",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.scan = hw_scan,
	.dev_list = hw_dev_list,
	.dev_clear = hw_cleanup,
	.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,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
	.priv = NULL,
};