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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 | g_slist_free(session->devices); | |
58 | ||
59 | /* TODO: Loop over protocol decoders and free them. */ | |
60 | ||
61 | g_free(session); | |
62 | } | |
63 | ||
64 | void sr_session_device_clear(void) | |
65 | { | |
66 | g_slist_free(session->devices); | |
67 | session->devices = NULL; | |
68 | } | |
69 | ||
70 | int sr_session_device_add(struct sr_device *device) | |
71 | { | |
72 | int ret; | |
73 | ||
74 | if (device->plugin && device->plugin->open) { | |
75 | ret = device->plugin->open(device->plugin_index); | |
76 | if (ret != SR_OK) | |
77 | return ret; | |
78 | } | |
79 | ||
80 | session->devices = g_slist_append(session->devices, device); | |
81 | ||
82 | return SR_OK; | |
83 | } | |
84 | ||
85 | #if 0 | |
86 | void sr_session_pa_clear(void) | |
87 | { | |
88 | /* | |
89 | * The protocols are pointers to the global set of PA plugins, | |
90 | * so don't free them. | |
91 | */ | |
92 | g_slist_free(session->analyzers); | |
93 | session->analyzers = NULL; | |
94 | } | |
95 | ||
96 | void sr_session_pa_add(struct sr_analyzer *an) | |
97 | { | |
98 | session->analyzers = g_slist_append(session->analyzers, an); | |
99 | } | |
100 | #endif | |
101 | ||
102 | void sr_session_datafeed_callback_clear(void) | |
103 | { | |
104 | g_slist_free(session->datafeed_callbacks); | |
105 | session->datafeed_callbacks = NULL; | |
106 | } | |
107 | ||
108 | void sr_session_datafeed_callback_add(sr_datafeed_callback callback) | |
109 | { | |
110 | session->datafeed_callbacks = | |
111 | g_slist_append(session->datafeed_callbacks, callback); | |
112 | } | |
113 | ||
114 | static void sr_session_run_poll() | |
115 | { | |
116 | GPollFD *fds, my_gpollfd; | |
117 | int ret, i; | |
118 | ||
119 | fds = NULL; | |
120 | while (session->running) { | |
121 | if (fds) | |
122 | free(fds); | |
123 | ||
124 | /* Construct g_poll()'s array. */ | |
125 | fds = malloc(sizeof(GPollFD) * num_sources); | |
126 | for (i = 0; i < num_sources; i++) { | |
127 | #ifdef _WIN32 | |
128 | g_io_channel_win32_make_pollfd(&channels[0], | |
129 | sources[i].events, &my_gpollfd); | |
130 | #else | |
131 | my_gpollfd.fd = sources[i].fd; | |
132 | my_gpollfd.events = sources[i].events; | |
133 | fds[i] = my_gpollfd; | |
134 | #endif | |
135 | } | |
136 | ||
137 | ret = g_poll(fds, num_sources, source_timeout); | |
138 | ||
139 | for (i = 0; i < num_sources; i++) { | |
140 | if (fds[i].revents > 0 || (ret == 0 | |
141 | && source_timeout == sources[i].timeout)) { | |
142 | /* | |
143 | * Invoke the source's callback on an event, | |
144 | * or if the poll timeout out and this source | |
145 | * asked for that timeout. | |
146 | */ | |
147 | sources[i].cb(fds[i].fd, fds[i].revents, | |
148 | sources[i].user_data); | |
149 | } | |
150 | } | |
151 | } | |
152 | free(fds); | |
153 | ||
154 | } | |
155 | ||
156 | int sr_session_start(void) | |
157 | { | |
158 | struct sr_device *device; | |
159 | GSList *l; | |
160 | int ret; | |
161 | ||
162 | sr_info("session: starting"); | |
163 | for (l = session->devices; l; l = l->next) { | |
164 | device = l->data; | |
165 | if ((ret = device->plugin->start_acquisition( | |
166 | device->plugin_index, device)) != SR_OK) | |
167 | break; | |
168 | } | |
169 | ||
170 | return ret; | |
171 | } | |
172 | ||
173 | void sr_session_run(void) | |
174 | { | |
175 | ||
176 | sr_info("session: running"); | |
177 | session->running = TRUE; | |
178 | ||
179 | /* do we have real sources? */ | |
180 | if (num_sources == 1 && sources[0].fd == -1) | |
181 | /* dummy source, freewheel over it */ | |
182 | while (session->running) | |
183 | sources[0].cb(-1, 0, sources[0].user_data); | |
184 | else | |
185 | /* real sources, use g_poll() main loop */ | |
186 | sr_session_run_poll(); | |
187 | ||
188 | } | |
189 | ||
190 | void sr_session_halt(void) | |
191 | { | |
192 | ||
193 | sr_info("session: halting"); | |
194 | session->running = FALSE; | |
195 | ||
196 | } | |
197 | ||
198 | void sr_session_stop(void) | |
199 | { | |
200 | struct sr_device *device; | |
201 | GSList *l; | |
202 | ||
203 | sr_info("session: stopping"); | |
204 | session->running = FALSE; | |
205 | for (l = session->devices; l; l = l->next) { | |
206 | device = l->data; | |
207 | if (device->plugin && device->plugin->stop_acquisition) | |
208 | device->plugin->stop_acquisition(device->plugin_index, device); | |
209 | } | |
210 | ||
211 | } | |
212 | ||
213 | void sr_session_bus(struct sr_device *device, struct sr_datafeed_packet *packet) | |
214 | { | |
215 | GSList *l; | |
216 | sr_datafeed_callback cb; | |
217 | ||
218 | /* | |
219 | * TODO: Send packet through PD pipe, and send the output of that to | |
220 | * the callbacks as well. | |
221 | */ | |
222 | for (l = session->datafeed_callbacks; l; l = l->next) { | |
223 | cb = l->data; | |
224 | cb(device, packet); | |
225 | } | |
226 | } | |
227 | ||
228 | void sr_session_source_add(int fd, int events, int timeout, | |
229 | sr_receive_data_callback callback, void *user_data) | |
230 | { | |
231 | struct source *new_sources, *s; | |
232 | ||
233 | new_sources = calloc(1, sizeof(struct source) * (num_sources + 1)); | |
234 | ||
235 | if (sources) { | |
236 | memcpy(new_sources, sources, | |
237 | sizeof(struct source) * num_sources); | |
238 | free(sources); | |
239 | } | |
240 | ||
241 | s = &new_sources[num_sources++]; | |
242 | s->fd = fd; | |
243 | s->events = events; | |
244 | s->timeout = timeout; | |
245 | s->cb = callback; | |
246 | s->user_data = user_data; | |
247 | sources = new_sources; | |
248 | ||
249 | if (timeout != source_timeout && timeout > 0 | |
250 | && (source_timeout == -1 || timeout < source_timeout)) | |
251 | source_timeout = timeout; | |
252 | } | |
253 | ||
254 | void sr_session_source_remove(int fd) | |
255 | { | |
256 | struct source *new_sources; | |
257 | int old, new; | |
258 | ||
259 | if (!sources) | |
260 | return; | |
261 | ||
262 | new_sources = calloc(1, sizeof(struct source) * num_sources); | |
263 | for (old = 0; old < num_sources; old++) | |
264 | if (sources[old].fd != fd) | |
265 | memcpy(&new_sources[new++], &sources[old], | |
266 | sizeof(struct source)); | |
267 | ||
268 | if (old != new) { | |
269 | free(sources); | |
270 | sources = new_sources; | |
271 | num_sources--; | |
272 | } else { | |
273 | /* Target fd was not found. */ | |
274 | free(new_sources); | |
275 | } | |
276 | } | |
277 |