session.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2010 Bert Vermeulen <bert@biot.com>
   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 3 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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "config.h"
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <string.h>
  25 #include <glib.h>
  26 #include <sigrok.h>
  27 #include <sigrok-internal.h>
  28
  29 /* demo.c */
  30 extern GIOChannel channels[2];
  31
  32 struct source {
  33         int fd;
  34         int events;
  35         int timeout;
  36         sr_receive_data_callback cb;
  37         void *user_data;
  38 };
  39
  40 /* There can only be one session at a time. */
  41 struct sr_session *session;
  42 int num_sources = 0;
  43
  44 struct source *sources = NULL;
  45 int source_timeout = -1;
  46
  47
  48 struct sr_session *sr_session_new(void)
  49 {
  50         session = calloc(1, sizeof(struct sr_session));
  51
  52         return session;
  53 }
  54
  55 void sr_session_destroy(void)
  56 {
  57
  58         g_slist_free(session->devices);
  59
  60         /* TODO: Loop over protocol decoders and free them. */
  61
  62         g_free(session);
  63 }
  64
  65 void sr_session_device_clear(void)
  66 {
  67         g_slist_free(session->devices);
  68         session->devices = NULL;
  69 }
  70
  71 int sr_session_device_add(struct sr_device *device)
  72 {
  73         int ret;
  74
  75         if (device->plugin && device->plugin->opendev) {
  76                 ret = device->plugin->opendev(device->plugin_index);
  77                 if (ret != SR_OK)
  78                         return ret;
  79         }
  80
  81         session->devices = g_slist_append(session->devices, device);
  82
  83         return SR_OK;
  84 }
  85
  86 #if 0
  87 void sr_session_pa_clear(void)
  88 {
  89         /*
  90          * The protocols are pointers to the global set of PA plugins,
  91          * so don't free them.
  92          */
  93         g_slist_free(session->analyzers);
  94         session->analyzers = NULL;
  95 }
  96
  97 void sr_session_pa_add(struct sr_analyzer *an)
  98 {
  99         session->analyzers = g_slist_append(session->analyzers, an);
 100 }
 101 #endif
 102
 103 void sr_session_datafeed_callback_clear(void)
 104 {
 105         g_slist_free(session->datafeed_callbacks);
 106         session->datafeed_callbacks = NULL;
 107 }
 108
 109 void sr_session_datafeed_callback_add(sr_datafeed_callback callback)
 110 {
 111         session->datafeed_callbacks =
 112             g_slist_append(session->datafeed_callbacks, callback);
 113 }
 114
 115 static void sr_session_run_poll()
 116 {
 117         GPollFD *fds, my_gpollfd;
 118         int ret, i;
 119
 120         fds = NULL;
 121         while (session->running) {
 122                 if (fds)
 123                         free(fds);
 124
 125                 /* Construct g_poll()'s array. */
 126                 fds = malloc(sizeof(GPollFD) * num_sources);
 127                 for (i = 0; i < num_sources; i++) {
 128 #ifdef _WIN32
 129                         g_io_channel_win32_make_pollfd(&channels[0],
 130                                         sources[i].events, &my_gpollfd);
 131 #else
 132                         my_gpollfd.fd = sources[i].fd;
 133                         my_gpollfd.events = sources[i].events;
 134                         fds[i] = my_gpollfd;
 135 #endif
 136                 }
 137
 138                 ret = g_poll(fds, num_sources, source_timeout);
 139
 140                 for (i = 0; i < num_sources; i++) {
 141                         if (fds[i].revents > 0 || (ret == 0
 142                                 && source_timeout == sources[i].timeout)) {
 143                                 /*
 144                                  * Invoke the source's callback on an event,
 145                                  * or if the poll timeout out and this source
 146                                  * asked for that timeout.
 147                                  */
 148                                 if (!sources[i].cb(fds[i].fd, fds[i].revents,
 149                                                   sources[i].user_data))
 150                                         sr_session_source_remove(sources[i].fd);
 151                         }
 152                 }
 153         }
 154         free(fds);
 155
 156 }
 157
 158 int sr_session_start(void)
 159 {
 160         struct sr_device *device;
 161         GSList *l;
 162         int ret;
 163
 164         sr_info("session: starting");
 165         for (l = session->devices; l; l = l->next) {
 166                 device = l->data;
 167                 if ((ret = device->plugin->start_acquisition(
 168                                 device->plugin_index, device)) != SR_OK)
 169                         break;
 170         }
 171
 172         return ret;
 173 }
 174
 175 void sr_session_run(void)
 176 {
 177
 178         sr_info("session: running");
 179         session->running = TRUE;
 180
 181         /* do we have real sources? */
 182         if (num_sources == 1 && sources[0].fd == -1)
 183                 /* dummy source, freewheel over it */
 184                 while (session->running)
 185                         sources[0].cb(-1, 0, sources[0].user_data);
 186         else
 187                 /* real sources, use g_poll() main loop */
 188                 sr_session_run_poll();
 189
 190 }
 191
 192 void sr_session_halt(void)
 193 {
 194
 195         sr_info("session: halting");
 196         session->running = FALSE;
 197
 198 }
 199
 200 void sr_session_stop(void)
 201 {
 202         struct sr_device *device;
 203         GSList *l;
 204
 205         sr_info("session: stopping");
 206         session->running = FALSE;
 207         for (l = session->devices; l; l = l->next) {
 208                 device = l->data;
 209                 if (device->plugin && device->plugin->stop_acquisition)
 210                         device->plugin->stop_acquisition(device->plugin_index, device);
 211         }
 212
 213 }
 214
 215 static void datafeed_dump(struct sr_datafeed_packet *packet)
 216 {
 217         struct sr_datafeed_logic *logic;
 218
 219         switch (packet->type) {
 220         case SR_DF_HEADER:
 221                 sr_dbg("bus: received SR_DF_HEADER");
 222                 break;
 223         case SR_DF_TRIGGER:
 224                 sr_dbg("bus: received SR_DF_TRIGGER at %lu ms",
 225                                 packet->timeoffset / 1000000);
 226                 break;
 227         case SR_DF_LOGIC:
 228                 logic = packet->payload;
 229                 sr_dbg("bus: received SR_DF_LOGIC at %f ms duration %f ms, %"PRIu64" bytes",
 230                                 packet->timeoffset / 1000000.0, packet->duration / 1000000.0,
 231                                 logic->length);
 232                 break;
 233         case SR_DF_END:
 234                 sr_dbg("bus: received SR_DF_END");
 235                 break;
 236         default:
 237                 sr_dbg("bus: received unknown packet type %d", packet->type);
 238         }
 239
 240 }
 241
 242 void sr_session_bus(struct sr_device *device, struct sr_datafeed_packet *packet)
 243 {
 244         GSList *l;
 245         sr_datafeed_callback cb;
 246
 247         /*
 248          * TODO: Send packet through PD pipe, and send the output of that to
 249          * the callbacks as well.
 250          */
 251         for (l = session->datafeed_callbacks; l; l = l->next) {
 252                 cb = l->data;
 253                 datafeed_dump(packet);
 254                 cb(device, packet);
 255         }
 256 }
 257
 258 void sr_session_source_add(int fd, int events, int timeout,
 259                 sr_receive_data_callback callback, void *user_data)
 260 {
 261         struct source *new_sources, *s;
 262
 263         new_sources = calloc(1, sizeof(struct source) * (num_sources + 1));
 264
 265         if (sources) {
 266                 memcpy(new_sources, sources,
 267                        sizeof(struct source) * num_sources);
 268                 free(sources);
 269         }
 270
 271         s = &new_sources[num_sources++];
 272         s->fd = fd;
 273         s->events = events;
 274         s->timeout = timeout;
 275         s->cb = callback;
 276         s->user_data = user_data;
 277         sources = new_sources;
 278
 279         if (timeout != source_timeout && timeout > 0
 280             && (source_timeout == -1 || timeout < source_timeout))
 281                 source_timeout = timeout;
 282 }
 283
 284 void sr_session_source_remove(int fd)
 285 {
 286         struct source *new_sources;
 287         int old, new;
 288
 289         if (!sources)
 290                 return;
 291
 292         new_sources = calloc(1, sizeof(struct source) * num_sources);
 293         for (old = 0, new = 0; old < num_sources; old++)
 294                 if (sources[old].fd != fd)
 295                         memcpy(&new_sources[new++], &sources[old],
 296                                sizeof(struct source));
 297
 298         if (old != new) {
 299                 free(sources);
 300                 sources = new_sources;
 301                 num_sources--;
 302         } else {
 303                 /* Target fd was not found. */
 304                 free(new_sources);
 305         }
 306 }
 307