2 * This file is part of the sigrok project.
4 * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
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.
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.
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/>.
26 #include "sigrok-internal.h"
28 /* demo.c. TODO: Should not be global! */
29 extern SR_PRIV GIOChannel channels[2];
35 sr_receive_data_callback cb;
39 /* There can only be one session at a time. */
40 /* 'session' is not static, it's used elsewhere (via 'extern'). */
41 struct sr_session *session;
42 static int num_sources = 0;
44 static struct source *sources = NULL;
45 static int source_timeout = -1;
48 * Create a new session.
52 * TODO: Should return int?
53 * TODO: Should it use the file-global "session" variable or take an argument?
54 * The same question applies to all the other session functions.
56 * @return A pointer to the newly allocated session, or NULL upon errors.
58 SR_API struct sr_session *sr_session_new(void)
60 if (!(session = g_try_malloc0(sizeof(struct sr_session)))) {
61 sr_err("session: %s: session malloc failed", __func__);
62 return NULL; /* TODO: SR_ERR_MALLOC? */
69 * Destroy the current session.
71 * This frees up all memory used by the session.
73 * @return SR_OK upon success, SR_ERR_BUG if no session exists.
75 SR_API int sr_session_destroy(void)
78 sr_err("session: %s: session was NULL", __func__);
82 g_slist_free(session->devices);
83 session->devices = NULL;
85 /* TODO: Error checks needed? */
87 /* TODO: Loop over protocol decoders and free them. */
96 * Remove all the devices from the current session. TODO?
98 * The session itself (i.e., the struct sr_session) is not free'd and still
99 * exists after this function returns.
101 * @return SR_OK upon success, SR_ERR_BUG if no session exists.
103 SR_API int sr_session_device_clear(void)
106 sr_err("session: %s: session was NULL", __func__);
110 g_slist_free(session->devices);
111 session->devices = NULL;
117 * Add a device to the current session.
119 * @param device The device to add to the current session. Must not be NULL.
120 * Also, device->plugin and device->plugin->opendev must not
123 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
125 SR_API int sr_session_device_add(struct sr_device *device)
130 sr_err("session: %s: device was NULL", __func__);
134 if (!device->plugin) {
135 sr_err("session: %s: device->plugin was NULL", __func__);
139 if (!device->plugin->opendev) {
140 sr_err("session: %s: device->plugin->opendev was NULL",
146 sr_err("session: %s: session was NULL", __func__);
147 return SR_ERR; /* TODO: SR_ERR_BUG? */
150 if ((ret = device->plugin->opendev(device->plugin_index)) != SR_OK) {
151 sr_err("session: %s: opendev failed (%d)", __func__, ret);
155 session->devices = g_slist_append(session->devices, device);
161 * Clear all datafeed callbacks in the current session.
165 * @return SR_OK upon success, SR_ERR_BUG if no session exists.
167 SR_API int sr_session_datafeed_callback_clear(void)
170 sr_err("session: %s: session was NULL", __func__);
174 g_slist_free(session->datafeed_callbacks);
175 session->datafeed_callbacks = NULL;
181 * Add a datafeed callback to the current session.
183 * @param callback TODO.
184 * @return SR_OK upon success, SR_ERR_BUG if no session exists.
186 SR_API int sr_session_datafeed_callback_add(sr_datafeed_callback callback)
189 sr_err("session: %s: session was NULL", __func__);
193 /* TODO: Is 'callback' allowed to be NULL? */
195 session->datafeed_callbacks =
196 g_slist_append(session->datafeed_callbacks, callback);
204 static int sr_session_run_poll(void)
206 GPollFD *fds, my_gpollfd;
210 while (session->running) {
211 /* TODO: Add comment. */
214 /* Construct g_poll()'s array. */
215 if (!(fds = g_try_malloc(sizeof(GPollFD) * num_sources))) {
216 sr_err("session: %s: fds malloc failed", __func__);
217 return SR_ERR_MALLOC;
219 for (i = 0; i < num_sources; i++) {
221 g_io_channel_win32_make_pollfd(&channels[0],
222 sources[i].events, &my_gpollfd);
224 my_gpollfd.fd = sources[i].fd;
225 my_gpollfd.events = sources[i].events;
230 ret = g_poll(fds, num_sources, source_timeout);
232 for (i = 0; i < num_sources; i++) {
233 if (fds[i].revents > 0 || (ret == 0
234 && source_timeout == sources[i].timeout)) {
236 * Invoke the source's callback on an event,
237 * or if the poll timeout out and this source
238 * asked for that timeout.
240 if (!sources[i].cb(fds[i].fd, fds[i].revents,
241 sources[i].user_data))
242 sr_session_source_remove(sources[i].fd);
254 * There can only be one session at a time. TODO
256 * @return SR_OK upon success, SR_ERR upon errors.
258 SR_API int sr_session_start(void)
260 struct sr_device *device;
265 sr_err("session: %s: session was NULL; a session must be "
266 "created first, before starting it.", __func__);
267 return SR_ERR; /* TODO: SR_ERR_BUG? */
270 if (!session->devices) {
271 /* TODO: Actually the case? */
272 sr_err("session: %s: session->devices was NULL; a session "
273 "cannot be started without devices.", __func__);
274 return SR_ERR; /* TODO: SR_ERR_BUG? */
277 /* TODO: Check plugin_index validity? */
279 sr_info("session: starting");
281 for (l = session->devices; l; l = l->next) {
283 /* TODO: Check for device != NULL. */
284 if ((ret = device->plugin->start_acquisition(
285 device->plugin_index, device)) != SR_OK) {
286 sr_err("session: %s: could not start an acquisition "
287 "(%d)", __func__, ret);
292 /* TODO: What if there are multiple devices? Which return code? */
300 * TODO: Various error checks etc.
302 * @return SR_OK upon success, SR_ERR_BUG upon errors.
304 SR_API int sr_session_run(void)
307 sr_err("session: %s: session was NULL; a session must be "
308 "created first, before running it.", __func__);
312 if (!session->devices) {
313 /* TODO: Actually the case? */
314 sr_err("session: %s: session->devices was NULL; a session "
315 "cannot be run without devices.", __func__);
319 sr_info("session: running");
320 session->running = TRUE;
322 /* Do we have real sources? */
323 if (num_sources == 1 && sources[0].fd == -1) {
324 /* Dummy source, freewheel over it. */
325 while (session->running)
326 sources[0].cb(-1, 0, sources[0].user_data);
328 /* Real sources, use g_poll() main loop. */
329 sr_session_run_poll();
336 * Halt the current session.
340 * @return SR_OK upon success, SR_ERR_BUG if no session exists.
342 SR_API int sr_session_halt(void)
345 sr_err("session: %s: session was NULL", __func__);
349 sr_info("session: halting");
350 session->running = FALSE;
356 * Stop the current session.
358 * TODO: Difference to halt?
360 * @return SR_OK upon success, SR_ERR_BUG if no session exists.
362 SR_API int sr_session_stop(void)
364 struct sr_device *device;
368 sr_err("session: %s: session was NULL", __func__);
372 sr_info("session: stopping");
373 session->running = FALSE;
375 for (l = session->devices; l; l = l->next) {
377 /* Check for device != NULL. */
378 if (device->plugin) {
379 if (device->plugin->stop_acquisition)
380 device->plugin->stop_acquisition(device->plugin_index, device);
381 if (device->plugin->cleanup)
382 device->plugin->cleanup();
390 * @brief debug helper
392 * @param packet TODO.
395 static void datafeed_dump(struct sr_datafeed_packet *packet)
397 struct sr_datafeed_logic *logic;
399 switch (packet->type) {
401 sr_dbg("bus: received SR_DF_HEADER");
404 sr_dbg("bus: received SR_DF_TRIGGER");
407 logic = packet->payload;
408 /* TODO: Check for logic != NULL. */
409 sr_dbg("bus: received SR_DF_LOGIC %" PRIu64 " bytes", logic->length);
412 sr_dbg("bus: received SR_DF_END");
415 sr_dbg("bus: received unknown packet type %d", packet->type);
424 * @param device TODO.
425 * @param packet TODO.
426 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
428 SR_API int sr_session_bus(struct sr_device *device,
429 struct sr_datafeed_packet *packet)
432 sr_datafeed_callback cb;
435 sr_err("session: %s: device was NULL", __func__);
439 if (!device->plugin) {
440 sr_err("session: %s: device->plugin was NULL", __func__);
445 sr_err("session: %s: packet was NULL", __func__);
450 * TODO: Send packet through PD pipe, and send the output of that to
451 * the callbacks as well.
453 for (l = session->datafeed_callbacks; l; l = l->next) {
454 if (sr_log_loglevel_get() >= SR_LOG_DBG)
455 datafeed_dump(packet);
457 /* TODO: Check for cb != NULL. */
467 * TODO: More error checks etc.
470 * @param events TODO.
471 * @param timeout TODO.
472 * @param callback TODO.
473 * @param user_data TODO.
474 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
475 * SR_ERR_MALLOC upon memory allocation errors.
477 SR_API int sr_session_source_add(int fd, int events, int timeout,
478 sr_receive_data_callback callback, void *user_data)
480 struct source *new_sources, *s;
483 sr_err("session: %s: callback was NULL", __func__);
487 /* Note: user_data can be NULL, that's not a bug. */
489 new_sources = g_try_malloc0(sizeof(struct source) * (num_sources + 1));
491 sr_err("session: %s: new_sources malloc failed", __func__);
492 return SR_ERR_MALLOC;
496 memcpy(new_sources, sources,
497 sizeof(struct source) * num_sources);
501 s = &new_sources[num_sources++];
504 s->timeout = timeout;
506 s->user_data = user_data;
507 sources = new_sources;
509 if (timeout != source_timeout && timeout > 0
510 && (source_timeout == -1 || timeout < source_timeout))
511 source_timeout = timeout;
517 * Remove the source belonging to the specified file descriptor.
519 * TODO: More error checks.
522 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
523 * SR_ERR_MALLOC upon memory allocation errors, SR_ERR_BUG upon
526 SR_API int sr_session_source_remove(int fd)
528 struct source *new_sources;
532 sr_err("session: %s: sources was NULL", __func__);
533 return SR_ERR_BUG; /* TODO: Other? */
536 /* TODO: Check if 'fd' valid. */
538 new_sources = g_try_malloc0(sizeof(struct source) * num_sources);
540 sr_err("session: %s: new_sources malloc failed", __func__);
541 return SR_ERR_MALLOC;
544 for (old = 0, new = 0; old < num_sources; old++) {
545 if (sources[old].fd != fd)
546 memcpy(&new_sources[new++], &sources[old],
547 sizeof(struct source));
552 sources = new_sources;
555 /* Target fd was not found. */