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Prefix device structs with sr_.
[libsigrok.git] / 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 <stdio.h>
21 #include <stdlib.h>
22 #include <unistd.h>
23 #include <string.h>
24 #include <zip.h>
25 #include <glib.h>
26 #include <sigrok.h>
27 #include <config.h>
28
29
30 /* There can only be one session at a time. */
31 struct session *session;
32 int num_sources = 0;
33 /* These live in hwplugin.c, for the frontend to override. */
34 extern source_callback_add source_cb_add;
35 extern source_callback_remove source_cb_remove;
36
37 struct source {
38         int fd;
39         int events;
40         int timeout;
41         receive_data_callback cb;
42         void *user_data;
43 };
44
45 struct source *sources = NULL;
46 int source_timeout = -1;
47
48
49
50
51 struct session *session_load(const char *filename)
52 {
53         struct session *session;
54
55         /* Avoid compiler warnings. */
56         filename = filename;
57
58         /* TODO: Implement. */
59         session = NULL;
60
61         return session;
62 }
63
64 struct session *session_new(void)
65 {
66         session = calloc(1, sizeof(struct session));
67
68         return session;
69 }
70
71 void session_destroy(void)
72 {
73         g_slist_free(session->devices);
74
75         /* TODO: Loop over protocol decoders and free them. */
76
77         g_free(session);
78 }
79
80 void session_device_clear(void)
81 {
82         g_slist_free(session->devices);
83         session->devices = NULL;
84 }
85
86 int session_device_add(struct sr_device *device)
87 {
88         int ret;
89
90         if (device->plugin && device->plugin->open) {
91                 ret = device->plugin->open(device->plugin_index);
92                 if (ret != SR_OK)
93                         return ret;
94         }
95
96         session->devices = g_slist_append(session->devices, device);
97
98         return SR_OK;
99 }
100
101 void session_pa_clear(void)
102 {
103         /*
104          * The protocols are pointers to the global set of PA plugins,
105          * so don't free them.
106          */
107         g_slist_free(session->analyzers);
108         session->analyzers = NULL;
109 }
110
111 void session_pa_add(struct analyzer *an)
112 {
113         session->analyzers = g_slist_append(session->analyzers, an);
114 }
115
116 void session_datafeed_callback_clear(void)
117 {
118         g_slist_free(session->datafeed_callbacks);
119         session->datafeed_callbacks = NULL;
120 }
121
122 void session_datafeed_callback_add(datafeed_callback callback)
123 {
124         session->datafeed_callbacks =
125             g_slist_append(session->datafeed_callbacks, callback);
126 }
127
128 int session_start(void)
129 {
130         struct sr_device *device;
131         GSList *l;
132         int ret;
133
134         g_message("starting session");
135         for (l = session->devices; l; l = l->next) {
136                 device = l->data;
137                 if ((ret = device->plugin->start_acquisition(
138                                 device->plugin_index, device)) != SR_OK)
139                         break;
140         }
141
142         return ret;
143 }
144
145 void session_run(void)
146 {
147         GPollFD *fds, my_gpollfd;
148         int ret, i;
149
150         g_message("running session");
151         session->running = TRUE;
152         fds = NULL;
153         while (session->running) {
154                 if (fds)
155                         free(fds);
156
157                 /* Construct g_poll()'s array. */
158                 fds = malloc(sizeof(GPollFD) * num_sources);
159                 for (i = 0; i < num_sources; i++) {
160 #ifdef _WIN32
161                         g_io_channel_win32_make_pollfd(&channels[0],
162                                         sources[i].events, &my_gpollfd);
163 #else
164                         my_gpollfd.fd = sources[i].fd;
165                         my_gpollfd.events = sources[i].events;
166                         fds[i] = my_gpollfd;
167 #endif
168                 }
169
170                 ret = g_poll(fds, num_sources, source_timeout);
171
172                 for (i = 0; i < num_sources; i++) {
173                         if (fds[i].revents > 0 || (ret == 0
174                                 && source_timeout == sources[i].timeout)) {
175                                 /*
176                                  * Invoke the source's callback on an event,
177                                  * or if the poll timeout out and this source
178                                  * asked for that timeout.
179                                  */
180                                 sources[i].cb(fds[i].fd, fds[i].revents,
181                                               sources[i].user_data);
182                         }
183                 }
184         }
185         free(fds);
186
187 }
188
189 void session_halt(void)
190 {
191
192         g_message("halting session");
193         session->running = FALSE;
194
195 }
196
197 void session_stop(void)
198 {
199         struct sr_device *device;
200         GSList *l;
201
202         g_message("stopping session");
203         session->running = FALSE;
204         for (l = session->devices; l; l = l->next) {
205                 device = l->data;
206                 if (device->plugin)
207                         device->plugin->stop_acquisition(device->plugin_index, device);
208         }
209
210 }
211
212 void session_bus(struct sr_device *device, struct sr_datafeed_packet *packet)
213 {
214         GSList *l;
215         datafeed_callback cb;
216
217         /*
218          * TODO: Send packet through PD pipe, and send the output of that to
219          * the callbacks as well.
220          */
221         for (l = session->datafeed_callbacks; l; l = l->next) {
222                 cb = l->data;
223                 cb(device, packet);
224         }
225 }
226
227 int session_save(char *filename)
228 {
229         GSList *l, *p, *d;
230         FILE *meta;
231         struct sr_device *device;
232         struct probe *probe;
233         struct datastore *ds;
234         struct zip *zipfile;
235         struct zip_source *versrc, *metasrc, *logicsrc;
236         int bufcnt, devcnt, tmpfile, ret, error;
237         char version[1], rawname[16], metafile[32], *newfn, *buf;
238
239         newfn = g_malloc(strlen(filename) + 10);
240         strcpy(newfn, filename);
241         if (strstr(filename, ".sigrok") != filename+strlen(filename)-7)
242                 strcat(newfn, ".sigrok");
243
244         /* Quietly delete it first, libzip wants replace ops otherwise. */
245         unlink(newfn);
246         if (!(zipfile = zip_open(newfn, ZIP_CREATE, &error)))
247                 return SR_ERR;
248         g_free(newfn);
249
250         /* "version" */
251         version[0] = '1';
252         if (!(versrc = zip_source_buffer(zipfile, version, 1, 0)))
253                 return SR_ERR;
254         if (zip_add(zipfile, "version", versrc) == -1) {
255                 g_message("error saving version into zipfile: %s",
256                           zip_strerror(zipfile));
257                 return SR_ERR;
258         }
259
260         /* init "metadata" */
261         strcpy(metafile, "sigrok-meta-XXXXXX");
262         if ((tmpfile = g_mkstemp(metafile)) == -1)
263                 return SR_ERR;
264         close(tmpfile);
265         meta = fopen(metafile, "wb");
266         fprintf(meta, "sigrok version = %s\n", PACKAGE_VERSION);
267         /* TODO: save protocol decoders used */
268
269         /* all datastores in all devices */
270         devcnt = 1;
271         for (l = session->devices; l; l = l->next) {
272                 device = l->data;
273                 /* metadata */
274                 fprintf(meta, "[device]\n");
275                 if (device->plugin)
276                         fprintf(meta, "driver = %s\n", device->plugin->name);
277
278                 ds = device->datastore;
279                 if (ds) {
280                         /* metadata */
281                         fprintf(meta, "capturefile = logic-%d\n", devcnt);
282                         for (p = device->probes; p; p = p->next) {
283                                 probe = p->data;
284                                 if (probe->enabled) {
285                                         fprintf(meta, "probe %d", probe->index);
286                                         if (probe->name)
287                                                 fprintf(meta, " name \"%s\"", probe->name);
288                                         if (probe->trigger)
289                                                 fprintf(meta, " trigger \"%s\"",
290                                                         probe->trigger);
291                                         fprintf(meta, "\n");
292                                 }
293                         }
294
295                         /* dump datastore into logic-n */
296                         buf = malloc(ds->num_units * ds->ds_unitsize +
297                                    DATASTORE_CHUNKSIZE);
298                         bufcnt = 0;
299                         for (d = ds->chunklist; d; d = d->next) {
300                                 memcpy(buf + bufcnt, d->data,
301                                        DATASTORE_CHUNKSIZE);
302                                 bufcnt += DATASTORE_CHUNKSIZE;
303                         }
304                         if (!(logicsrc = zip_source_buffer(zipfile, buf,
305                                        ds->num_units * ds->ds_unitsize, TRUE)))
306                                 return SR_ERR;
307                         snprintf(rawname, 15, "logic-%d", devcnt);
308                         if (zip_add(zipfile, rawname, logicsrc) == -1)
309                                 return SR_ERR;
310                 }
311                 devcnt++;
312         }
313         fclose(meta);
314
315         if (!(metasrc = zip_source_file(zipfile, metafile, 0, -1)))
316                 return SR_ERR;
317         if (zip_add(zipfile, "metadata", metasrc) == -1)
318                 return SR_ERR;
319
320         if ((ret = zip_close(zipfile)) == -1) {
321                 g_message("error saving zipfile: %s", zip_strerror(zipfile));
322                 return SR_ERR;
323         }
324
325         unlink(metafile);
326
327         return SR_OK;
328 }
329
330 void session_source_add(int fd, int events, int timeout,
331                 receive_data_callback callback, void *user_data)
332 {
333         struct source *new_sources, *s;
334
335         new_sources = calloc(1, sizeof(struct source) * (num_sources + 1));
336
337         if (sources) {
338                 memcpy(new_sources, sources,
339                        sizeof(struct source) * num_sources);
340                 free(sources);
341         }
342
343         s = &new_sources[num_sources++];
344         s->fd = fd;
345         s->events = events;
346         s->timeout = timeout;
347         s->cb = callback;
348         s->user_data = user_data;
349         sources = new_sources;
350
351         if (timeout != source_timeout && timeout > 0
352             && (source_timeout == -1 || timeout < source_timeout))
353                 source_timeout = timeout;
354 }
355
356 void session_source_remove(int fd)
357 {
358         struct source *new_sources;
359         int old, new;
360
361         if (!sources)
362                 return;
363
364         new_sources = calloc(1, sizeof(struct source) * num_sources);
365         for (old = 0; old < num_sources; old++)
366                 if (sources[old].fd != fd)
367                         memcpy(&new_sources[new++], &sources[old],
368                                sizeof(struct source));
369
370         if (old != new) {
371                 free(sources);
372                 sources = new_sources;
373                 num_sources--;
374         } else {
375                 /* Target fd was not found. */
376                 free(new_sources);
377         }
378 }
379