libsigrok/session.c

278 lines
5.8 KiB
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 "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <glib.h>
#include <sigrok.h>
#include <sigrok-internal.h>
/* demo.c */
extern GIOChannel channels[2];
struct source {
int fd;
int events;
int timeout;
sr_receive_data_callback cb;
void *user_data;
};
/* There can only be one session at a time. */
struct sr_session *session;
int num_sources = 0;
struct source *sources = NULL;
int source_timeout = -1;
struct sr_session *sr_session_new(void)
{
session = calloc(1, sizeof(struct sr_session));
return session;
}
void sr_session_destroy(void)
{
g_slist_free(session->devices);
/* TODO: Loop over protocol decoders and free them. */
g_free(session);
}
void sr_session_device_clear(void)
{
g_slist_free(session->devices);
session->devices = NULL;
}
int sr_session_device_add(struct sr_device *device)
{
int ret;
if (device->plugin && device->plugin->opendev) {
ret = device->plugin->opendev(device->plugin_index);
if (ret != SR_OK)
return ret;
}
session->devices = g_slist_append(session->devices, device);
return SR_OK;
}
#if 0
void sr_session_pa_clear(void)
{
/*
* The protocols are pointers to the global set of PA plugins,
* so don't free them.
*/
g_slist_free(session->analyzers);
session->analyzers = NULL;
}
void sr_session_pa_add(struct sr_analyzer *an)
{
session->analyzers = g_slist_append(session->analyzers, an);
}
#endif
void sr_session_datafeed_callback_clear(void)
{
g_slist_free(session->datafeed_callbacks);
session->datafeed_callbacks = NULL;
}
void sr_session_datafeed_callback_add(sr_datafeed_callback callback)
{
session->datafeed_callbacks =
g_slist_append(session->datafeed_callbacks, callback);
}
static void sr_session_run_poll()
{
GPollFD *fds, my_gpollfd;
int ret, i;
fds = NULL;
while (session->running) {
if (fds)
free(fds);
/* Construct g_poll()'s array. */
fds = malloc(sizeof(GPollFD) * num_sources);
for (i = 0; i < num_sources; i++) {
#ifdef _WIN32
g_io_channel_win32_make_pollfd(&channels[0],
sources[i].events, &my_gpollfd);
#else
my_gpollfd.fd = sources[i].fd;
my_gpollfd.events = sources[i].events;
fds[i] = my_gpollfd;
#endif
}
ret = g_poll(fds, num_sources, source_timeout);
for (i = 0; i < num_sources; i++) {
if (fds[i].revents > 0 || (ret == 0
&& source_timeout == sources[i].timeout)) {
/*
* Invoke the source's callback on an event,
* or if the poll timeout out and this source
* asked for that timeout.
*/
sources[i].cb(fds[i].fd, fds[i].revents,
sources[i].user_data);
}
}
}
free(fds);
}
int sr_session_start(void)
{
struct sr_device *device;
GSList *l;
int ret;
sr_info("session: starting");
for (l = session->devices; l; l = l->next) {
device = l->data;
if ((ret = device->plugin->start_acquisition(
device->plugin_index, device)) != SR_OK)
break;
}
return ret;
}
void sr_session_run(void)
{
sr_info("session: running");
session->running = TRUE;
/* do we have real sources? */
if (num_sources == 1 && sources[0].fd == -1)
/* dummy source, freewheel over it */
while (session->running)
sources[0].cb(-1, 0, sources[0].user_data);
else
/* real sources, use g_poll() main loop */
sr_session_run_poll();
}
void sr_session_halt(void)
{
sr_info("session: halting");
session->running = FALSE;
}
void sr_session_stop(void)
{
struct sr_device *device;
GSList *l;
sr_info("session: stopping");
session->running = FALSE;
for (l = session->devices; l; l = l->next) {
device = l->data;
if (device->plugin && device->plugin->stop_acquisition)
device->plugin->stop_acquisition(device->plugin_index, device);
}
}
void sr_session_bus(struct sr_device *device, struct sr_datafeed_packet *packet)
{
GSList *l;
sr_datafeed_callback cb;
/*
* TODO: Send packet through PD pipe, and send the output of that to
* the callbacks as well.
*/
for (l = session->datafeed_callbacks; l; l = l->next) {
cb = l->data;
cb(device, packet);
}
}
void sr_session_source_add(int fd, int events, int timeout,
sr_receive_data_callback callback, void *user_data)
{
struct source *new_sources, *s;
new_sources = calloc(1, sizeof(struct source) * (num_sources + 1));
if (sources) {
memcpy(new_sources, sources,
sizeof(struct source) * num_sources);
free(sources);
}
s = &new_sources[num_sources++];
s->fd = fd;
s->events = events;
s->timeout = timeout;
s->cb = callback;
s->user_data = user_data;
sources = new_sources;
if (timeout != source_timeout && timeout > 0
&& (source_timeout == -1 || timeout < source_timeout))
source_timeout = timeout;
}
void sr_session_source_remove(int fd)
{
struct source *new_sources;
int old, new;
if (!sources)
return;
new_sources = calloc(1, sizeof(struct source) * num_sources);
for (old = 0; old < num_sources; old++)
if (sources[old].fd != fd)
memcpy(&new_sources[new++], &sources[old],
sizeof(struct source));
if (old != new) {
free(sources);
sources = new_sources;
num_sources--;
} else {
/* Target fd was not found. */
free(new_sources);
}
}