serial: Remove unneccesary nesting

[libsigrok.git] / hardware / openbench-logic-sniffer / ols.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2010 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 <stdint.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#ifndef _WIN32
#include <termios.h>
#endif
#include <string.h>
#include <sys/time.h>
#include <inttypes.h>
#ifdef _WIN32
/* TODO */
#else
#include <arpa/inet.h>
#endif
#include <glib.h>
#include <sigrok.h>

#define NUM_PROBES			32
#define NUM_TRIGGER_STAGES		4
#define TRIGGER_TYPES			"01"
#define SERIAL_SPEED			B115200
/* TODO: SERIAL_ bits, parity, stop bit */
#define CLOCK_RATE			100000000

/* Command opcodes */
#define CMD_RESET			0x00
#define CMD_ID				0x02
#define CMD_SET_FLAGS			0x82
#define CMD_SET_DIVIDER			0x80
#define CMD_RUN				0x01
#define CMD_CAPTURE_SIZE		0x81
#define CMD_SET_TRIGGER_MASK_0		0xc0
#define CMD_SET_TRIGGER_MASK_1		0xc4
#define CMD_SET_TRIGGER_MASK_2		0xc8
#define CMD_SET_TRIGGER_MASK_3		0xcc
#define CMD_SET_TRIGGER_VALUE_0		0xc1
#define CMD_SET_TRIGGER_VALUE_1		0xc5
#define CMD_SET_TRIGGER_VALUE_2		0xc9
#define CMD_SET_TRIGGER_VALUE_3		0xcd
#define CMD_SET_TRIGGER_CONFIG_0	0xc2
#define CMD_SET_TRIGGER_CONFIG_1	0xc6
#define CMD_SET_TRIGGER_CONFIG_2	0xca
#define CMD_SET_TRIGGER_CONFIG_3	0xce

/* Bitmasks for CMD_FLAGS */
#define FLAG_DEMUX			0x01
#define FLAG_FILTER			0x02
#define FLAG_CHANNELGROUP_1		0x04
#define FLAG_CHANNELGROUP_2		0x08
#define FLAG_CHANNELGROUP_3		0x10
#define FLAG_CHANNELGROUP_4		0x20
#define FLAG_CLOCK_EXTERNAL		0x40
#define FLAG_CLOCK_INVERTED		0x80
#define FLAG_RLE			0x0100

static int capabilities[] = {
	HWCAP_LOGIC_ANALYZER,
	HWCAP_SAMPLERATE,
	HWCAP_CAPTURE_RATIO,
	HWCAP_LIMIT_SAMPLES,
	0,
};

static struct samplerates samplerates = {
	10,
	MHZ(200),
	1,
	0,
};

/* List of struct serial_device_instance */
static GSList *device_instances = NULL;

/* Current state of the flag register */
static uint32_t flag_reg = 0;

static uint64_t cur_samplerate = 0;
static uint64_t limit_samples = 0;
/*
 * Pre/post trigger capture ratio, in percentage.
 * 0 means no pre-trigger data.
 */
static int capture_ratio = 0;
static uint32_t probe_mask = 0xffffffff;
static uint32_t trigger_mask[4] = { 0, 0, 0, 0 };
static uint32_t trigger_value[4] = { 0, 0, 0, 0 };

static int send_shortcommand(int fd, uint8_t command)
{
	char buf[1];

	g_message("ols: sending cmd 0x%.2x", command);
	buf[0] = command;
	if (write(fd, buf, 1) != 1)
		return SIGROK_ERR;

	return SIGROK_OK;
}

static int send_longcommand(int fd, uint8_t command, uint32_t data)
{
	char buf[5];

	g_message("ols: sending cmd 0x%.2x data 0x%.8x", command, data);
	buf[0] = command;
	buf[1] = (data & 0xff000000) >> 24;
	buf[2] = (data & 0xff0000) >> 16;
	buf[3] = (data & 0xff00) >> 8;
	buf[4] = data & 0xff;
	if (write(fd, buf, 5) != 5)
		return SIGROK_ERR;

	return SIGROK_OK;
}

static int configure_probes(GSList *probes)
{
	struct probe *probe;
	GSList *l;
	int probe_bit, stage, i;
	char *tc;

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

	for (l = probes; l; l = l->next) {
		probe = (struct probe *)l->data;
		if (!probe->enabled)
			continue;

		/*
		 * Set up the probe mask for later configuration into the
		 * flag register.
		 */
		probe_bit = 1 << (probe->index - 1);
		probe_mask |= probe_bit;

		if (probe->trigger)
			continue;

		/* Configure trigger mask and value. */
		stage = 0;
		for (tc = probe->trigger; tc && *tc; tc++) {
			trigger_mask[stage] |= probe_bit;
			if (*tc == '1')
				trigger_value[stage] |= probe_bit;
			stage++;
			if (stage > 3)
				/*
				 * TODO: Only supporting parallel mode, with
				 * up to 4 stages.
				 */
				return SIGROK_ERR;
		}
	}

	return SIGROK_OK;
}

static void byteswap(uint32_t * in)
{
	uint32_t out;

	out = (*in & 0xff) << 8;
	out |= (*in & 0xff00) >> 8;
	out |= (*in & 0xff0000) << 8;
	out |= (*in & 0xff000000) >> 8;
	*in = out;
}

static int hw_init(char *deviceinfo)
{
	struct sigrok_device_instance *sdi;
	GSList *ports, *l;
	GPollFD *fds;
	int devcnt, final_devcnt, num_ports, fd, ret, i;
	char buf[8], **device_names, **serial_params;

	if (deviceinfo)
		ports = g_slist_append(NULL, strdup(deviceinfo));
	else
		/* No specific device given, so scan all serial ports. */
		ports = list_serial_ports();

	num_ports = g_slist_length(ports);
	fds = calloc(1, num_ports * sizeof(GPollFD));
	device_names = malloc(num_ports * sizeof(char *));
	serial_params = malloc(num_ports * sizeof(char *));
	devcnt = 0;
	for (l = ports; l; l = l->next) {
		/* The discovery procedure is like this: first send the Reset
		 * command (0x00) 5 times, since the device could be anywhere
		 * in a 5-byte command. Then send the ID command (0x02).
		 * If the device responds with 4 bytes ("OLS1" or "SLA1"), we
		 * have a match.
		 *
		 * Since it may take the device a while to respond at 115Kb/s,
		 * we do all the sending first, then wait for all of them to
		 * respond with g_poll().
		 */
		g_message("probing %s...", (char *)l->data);
#ifdef _WIN32
		// FIXME
		// hdl = serial_open(l->data, 0);
#else
		fd = serial_open(l->data, O_RDWR | O_NONBLOCK);
#endif
		if (fd != -1) {
			serial_params[devcnt] = serial_backup_params(fd);
			serial_set_params(fd, 115200, 8, 0, 1, 2);
			ret = SIGROK_OK;
			for (i = 0; i < 5; i++) {
				if ((ret = send_shortcommand(fd,
					CMD_RESET)) != SIGROK_OK) {
					/* Serial port is not writable. */
					break;
				}
			}
			if (ret != SIGROK_OK) {
				serial_restore_params(fd,
					serial_params[devcnt]);
				serial_close(fd);
				continue;
			}
			send_shortcommand(fd, CMD_ID);
			fds[devcnt].fd = fd;
			fds[devcnt].events = G_IO_IN;
			device_names[devcnt] = strdup(l->data);
			devcnt++;
		}
		free(l->data);
	}

	/* 2ms should do (enough time for 28 bytes to go over the bus). */
	usleep(2000);

	final_devcnt = 0;
	g_poll(fds, devcnt, 1);
	for (i = 0; i < devcnt; i++) {
		if (fds[i].revents == G_IO_IN) {
			if (read(fds[i].fd, buf, 4) == 4) {
				if (!strncmp(buf, "1SLO", 4)
				    || !strncmp(buf, "1ALS", 4)) {
					if (!strncmp(buf, "1SLO", 4))
						sdi = sigrok_device_instance_new
						    (final_devcnt, ST_INACTIVE,
						     "Openbench",
						     "Logic Sniffer", "v1.0");
					else
						sdi = sigrok_device_instance_new
						    (final_devcnt, ST_INACTIVE,
						     "Sump", "Logic Analyzer",
						     "v1.0");
					sdi->serial = serial_device_instance_new
					    (device_names[i], -1);
					device_instances =
					    g_slist_append(device_instances, sdi);
					final_devcnt++;
					serial_close(fds[i].fd);
					fds[i].fd = 0;
				}
			}
			free(device_names[i]);
		}

		if (fds[i].fd != 0) {
			serial_restore_params(fds[i].fd, serial_params[i]);
			serial_close(fds[i].fd);
		}
		free(serial_params[i]);
	}

	free(fds);
	free(device_names);
	free(serial_params);
	g_slist_free(ports);

	cur_samplerate = samplerates.low;

	return final_devcnt;
}

static int hw_opendev(int device_index)
{
	struct sigrok_device_instance *sdi;

	if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
		return SIGROK_ERR;

	sdi->serial->fd = serial_open(sdi->serial->port, O_RDWR);
	if (sdi->serial->fd == -1)
		return SIGROK_ERR;

	sdi->status = ST_ACTIVE;

	return SIGROK_OK;
}

static void hw_closedev(int device_index)
{
	struct sigrok_device_instance *sdi;

	if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
		return;

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

static void hw_cleanup(void)
{
	GSList *l;
	struct sigrok_device_instance *sdi;

	/* Properly close all devices. */
	for (l = device_instances; l; l = l->next) {
		sdi = l->data;
		if (sdi->serial->fd != -1)
			serial_close(sdi->serial->fd);
		sigrok_device_instance_free(sdi);
	}
	g_slist_free(device_instances);
	device_instances = NULL;
}

static void *hw_get_device_info(int device_index, int device_info_id)
{
	struct sigrok_device_instance *sdi;
	void *info;

	if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
		return NULL;

	info = NULL;
	switch (device_info_id) {
	case DI_INSTANCE:
		info = sdi;
		break;
	case DI_NUM_PROBES:
		info = GINT_TO_POINTER(NUM_PROBES);
		break;
	case DI_SAMPLERATES:
		info = &samplerates;
		break;
	case DI_TRIGGER_TYPES:
		info = (char *)TRIGGER_TYPES;
		break;
	case DI_CUR_SAMPLERATE:
		info = &cur_samplerate;
		break;
	}

	return info;
}

static int hw_get_status(int device_index)
{
	struct sigrok_device_instance *sdi;

	if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
		return ST_NOT_FOUND;

	return sdi->status;
}

static int *hw_get_capabilities(void)
{
	return capabilities;
}

static int set_configuration_samplerate(struct sigrok_device_instance *sdi,
					uint64_t samplerate)
{
	uint32_t divider;

	if (samplerate < samplerates.low || samplerate > samplerates.high)
		return SIGROK_ERR_SAMPLERATE;

	if (samplerate > CLOCK_RATE) {
		flag_reg |= FLAG_DEMUX;
		divider = (CLOCK_RATE * 2 / samplerate) - 1;
	} else {
		flag_reg &= ~FLAG_DEMUX;
		divider = (CLOCK_RATE / samplerate) - 1;
	}
#ifdef _WIN32
	// FIXME
	// divider = htonl(divider);
#else
	divider = htonl(divider);
#endif

	g_message("setting samplerate to %" PRIu64 " Hz (divider %u, demux %s)",
		  samplerate, divider, flag_reg & FLAG_DEMUX ? "on" : "off");

	if (send_longcommand(sdi->serial->fd, CMD_SET_DIVIDER,
	    divider) != SIGROK_OK)
		return SIGROK_ERR;
	cur_samplerate = samplerate;

	return SIGROK_OK;
}

static int hw_set_configuration(int device_index, int capability, void *value)
{
	struct sigrok_device_instance *sdi;
	int ret;
	uint64_t *tmp_u64;

	if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
		return SIGROK_ERR;

	if (sdi->status != ST_ACTIVE)
		return SIGROK_ERR;

	if (capability == HWCAP_SAMPLERATE) {
		tmp_u64 = value;
		ret = set_configuration_samplerate(sdi, *tmp_u64);
	} else if (capability == HWCAP_PROBECONFIG) {
		ret = configure_probes((GSList *) value);
	} else if (capability == HWCAP_LIMIT_SAMPLES) {
		limit_samples = strtoull(value, NULL, 10);
		ret = SIGROK_OK;
	} else if (capability == HWCAP_CAPTURE_RATIO) {
		capture_ratio = strtol(value, NULL, 10);
		if (capture_ratio < 0 || capture_ratio > 100) {
			capture_ratio = 0;
			ret = SIGROK_ERR;
		} else
			ret = SIGROK_OK;
	} else {
		ret = SIGROK_ERR;
	}

	return ret;
}

static int receive_data(int fd, int revents, void *user_data)
{
	static unsigned int num_transfers = 0;
	static int num_bytes = 0;
	static char last_sample[4] = { 0xff, 0xff, 0xff, 0xff };
	static unsigned char sample[4] = { 0, 0, 0, 0 };
	static unsigned char tmp_sample[4];
	int count, buflen, num_channels, i, j;
	struct datafeed_packet packet;
	unsigned char byte, *buffer;

	if (num_transfers++ == 0) {
		/*
		 * First time round, means the device started sending data,
		 * and will not stop until done. If it stops sending for
		 * longer than it takes to send a byte, that means it's
		 * finished. We'll double that to 30ms to be sure...
		 */
		source_remove(fd);
		source_add(fd, G_IO_IN, 100, receive_data, user_data);
	}

	num_channels = 0;
	for (i = 0x20; i > 0x02; i /= 2) {
		if ((flag_reg & i) == 0)
			num_channels++;
	}

	if (revents == G_IO_IN
	    && num_transfers / num_channels <= limit_samples) {
		if (read(fd, &byte, 1) != 1)
			return FALSE;

		sample[num_bytes++] = byte;
		if (num_bytes == num_channels) {
			/* Got a full sample. */
			if (flag_reg & FLAG_RLE) {
				/*
				 * In RLE mode -1 should never come in as a
				 * sample, because bit 31 is the "count" flag.
				 * TODO: Endianness may be wrong here, could be
				 * sample[3].
				 */
				if (sample[0] & 0x80
				    && !(last_sample[0] & 0x80)) {
					count = (int)(*sample) & 0x7fffffff;
					buffer = g_malloc(count);
					buflen = 0;
					for (i = 0; i < count; i++) {
						memcpy(buffer + buflen,
						       last_sample, 4);
						buflen += 4;
					}
				} else {
					/*
					 * Just a single sample, next sample
					 * will probably be a count referring
					 * to this -- but this one is still a
					 * part of the stream.
					 */
					buffer = sample;
					buflen = 4;
				}
			} else {
				/* No compression. */
				buffer = sample;
				buflen = 4;
			}

			if (num_channels < 4) {
				/*
				 * Some channel groups may have been turned
				 * off, to speed up transfer between the
				 * hardware and the PC. Expand that here before
				 * submitting it over the session bus --
				 * whatever is listening on the bus will be
				 * expecting a full 32-bit sample, based on
				 * the number of probes.
				 */
				j = 0;
				memset(tmp_sample, 0, 4);
				for (i = 0; i < 4; i++) {
					if ((flag_reg & (8 >> i)) == 0) {
						/*
						 * This channel group was
						 * enabled, copy from received
						 * sample.
						 */
						tmp_sample[i] = sample[j++];
					}
				}
				memcpy(sample, tmp_sample, 4);
			}

			/* Send it all to the session bus. */
			packet.type = DF_LOGIC32;
			packet.length = buflen;
			packet.payload = buffer;
			session_bus(user_data, &packet);
			if (buffer == sample)
				memcpy(last_sample, buffer, num_channels);
			else
				g_free(buffer);

			memset(sample, 0, 4);
			num_bytes = 0;
		}
	} else {
		/*
		 * This is the main loop telling us a timeout was reached, or
		 * we've acquired all the samples we asked for -- we're done.
		 */
#ifndef _WIN32
		/* TODO: Move to serial.c? */
		tcflush(fd, TCIOFLUSH);
#endif
		serial_close(fd);
		packet.type = DF_END;
		packet.length = 0;
		session_bus(user_data, &packet);
	}

	return TRUE;
}

static int hw_start_acquisition(int device_index, gpointer session_device_id)
{
	int i;
	struct datafeed_packet *packet;
	struct datafeed_header *header;
	struct sigrok_device_instance *sdi;
	uint32_t data;
	uint16_t readcount, delaycount;
	uint8_t changrp_mask;

	if (!(sdi = get_sigrok_device_instance(device_instances, device_index)))
		return SIGROK_ERR;

	if (sdi->status != ST_ACTIVE)
		return SIGROK_ERR;

	if (trigger_mask[0]) {
		/* Trigger masks */
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_MASK_0,
		     trigger_mask[0]) != SIGROK_OK)
			return SIGROK_ERR;
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_MASK_1,
		     trigger_mask[1]) != SIGROK_OK)
			return SIGROK_ERR;
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_MASK_2,
		     trigger_mask[2]) != SIGROK_OK)
			return SIGROK_ERR;
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_MASK_3,
		     trigger_mask[3]) != SIGROK_OK)
			return SIGROK_ERR;

		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_VALUE_0,
		     trigger_value[0]) != SIGROK_OK)
			return SIGROK_ERR;
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_VALUE_1,
		     trigger_value[1]) != SIGROK_OK)
			return SIGROK_ERR;
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_VALUE_2,
		     trigger_value[2]) != SIGROK_OK)
			return SIGROK_ERR;
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_VALUE_3,
		     trigger_value[3]) != SIGROK_OK)
			return SIGROK_ERR;

		/* Trigger configuration */
		/*
		 * TODO: The start flag should only be on the last used
		 * stage I think...
		 */
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_CONFIG_0,
		     0x00000008) != SIGROK_OK)
			return SIGROK_ERR;
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_CONFIG_1,
		     0x00000000) != SIGROK_OK)
			return SIGROK_ERR;
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_CONFIG_2,
		     0x00000000) != SIGROK_OK)
			return SIGROK_ERR;
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_CONFIG_3,
		     0x00000000) != SIGROK_OK)
			return SIGROK_ERR;
		delaycount = limit_samples / 4 * (capture_ratio / 100);
	} else {
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_MASK_0,
		     trigger_mask[0]) != SIGROK_OK)
			return SIGROK_ERR;
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_VALUE_0,
		     trigger_value[0]) != SIGROK_OK)
			return SIGROK_ERR;
		if (send_longcommand(sdi->serial->fd, CMD_SET_TRIGGER_CONFIG_0,
		     0x00000008) != SIGROK_OK)
			return SIGROK_ERR;
		delaycount = limit_samples / 4;
	}

	set_configuration_samplerate(sdi, cur_samplerate);

	/* Send sample limit and pre/post-trigger capture ratio. */
	readcount = limit_samples / 4;
	if (flag_reg & FLAG_DEMUX) {
		data = (delaycount - 8) & 0xfff8 << 13;
		data |= (readcount - 4) & 0xffff;
	} else {
		flag_reg |= FLAG_FILTER;
		data = (readcount - 1) << 16;
		data |= (delaycount - 1);
	}
	/* TODO: htonl()? */
	byteswap(&data);
	if (send_longcommand(sdi->serial->fd, CMD_CAPTURE_SIZE,
	    data) != SIGROK_OK)
		return SIGROK_ERR;

	/*
	 * Enable/disable channel groups in the flag register according to the
	 * probe mask. The register stores them backwards, hence shift right
	 * from 1000.
	 */
	changrp_mask = 0;
	for (i = 0; i < 4; i++) {
		if (probe_mask & (0xff << (i * 8)))
			changrp_mask |= (8 >> i);
	}

	/* The flag register wants them here, and 1 means "disable channel". */
	flag_reg |= ~(changrp_mask << 2) & 0x3c;

	data = flag_reg << 24;
	if (send_longcommand(sdi->serial->fd, CMD_SET_FLAGS, data) != SIGROK_OK)
		return SIGROK_ERR;

	/* Start acquisition on the device. */
	if (send_shortcommand(sdi->serial->fd, CMD_RUN) != SIGROK_OK)
		return SIGROK_ERR;

	source_add(sdi->serial->fd, G_IO_IN, -1, receive_data,
		   session_device_id);

	/* Send header packet to the session bus. */
	packet = g_malloc(sizeof(struct datafeed_packet));
	header = g_malloc(sizeof(struct datafeed_header));
	if (!packet || !header)
		return SIGROK_ERR;
	packet->type = DF_HEADER;
	packet->length = sizeof(struct datafeed_header);
	packet->payload = (unsigned char *)header;
	header->feed_version = 1;
	gettimeofday(&header->starttime, NULL);
	header->samplerate = cur_samplerate;
	header->protocol_id = PROTO_RAW;
	header->num_probes = NUM_PROBES;
	session_bus(session_device_id, packet);
	g_free(header);
	g_free(packet);

	return SIGROK_OK;
}

static void hw_stop_acquisition(int device_index, gpointer session_device_id)
{
	struct datafeed_packet packet;

	/* QUICK HACK */
	device_index = device_index;

	packet.type = DF_END;
	packet.length = 0;
	session_bus(session_device_id, &packet);
}

struct device_plugin ols_plugin_info = {
	"sump",
	1,
	hw_init,
	hw_cleanup,
	hw_opendev,
	hw_closedev,
	hw_get_device_info,
	hw_get_status,
	hw_get_capabilities,
	hw_set_configuration,
	hw_start_acquisition,
	hw_stop_acquisition,
};