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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com> | |
5 | * Copyright (C) 2012 Peter Stuge <peter@stuge.se> | |
6 | * | |
7 | * This program is free software: you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, either version 3 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include <glib.h> | |
22 | #include "config.h" /* Needed for HAVE_LIBUSB_1_0 and others. */ | |
23 | #include "libsigrok.h" | |
24 | #include "libsigrok-internal.h" | |
25 | ||
26 | #define LOG_PREFIX "backend" | |
27 | ||
28 | extern struct sr_session *session; | |
29 | ||
30 | /** | |
31 | * @mainpage libsigrok API | |
32 | * | |
33 | * @section sec_intro Introduction | |
34 | * | |
35 | * The <a href="http://sigrok.org">sigrok</a> project aims at creating a | |
36 | * portable, cross-platform, Free/Libre/Open-Source signal analysis software | |
37 | * suite that supports various device types (such as logic analyzers, | |
38 | * oscilloscopes, multimeters, and more). | |
39 | * | |
40 | * <a href="http://sigrok.org/wiki/Libsigrok">libsigrok</a> is a shared | |
41 | * library written in C which provides the basic API for talking to | |
42 | * <a href="http://sigrok.org/wiki/Supported_hardware">supported hardware</a> | |
43 | * and reading/writing the acquired data into various | |
44 | * <a href="http://sigrok.org/wiki/Input_output_formats">input/output | |
45 | * file formats</a>. | |
46 | * | |
47 | * @section sec_api API reference | |
48 | * | |
49 | * See the "Modules" page for an introduction to various libsigrok | |
50 | * related topics and the detailed API documentation of the respective | |
51 | * functions. | |
52 | * | |
53 | * You can also browse the API documentation by file, or review all | |
54 | * data structures. | |
55 | * | |
56 | * @section sec_mailinglists Mailing lists | |
57 | * | |
58 | * There are two mailing lists for sigrok/libsigrok: <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-devel">sigrok-devel</a> and <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-commits">sigrok-commits</a>. | |
59 | * | |
60 | * @section sec_irc IRC | |
61 | * | |
62 | * You can find the sigrok developers in the | |
63 | * <a href="irc://chat.freenode.net/sigrok">\#sigrok</a> | |
64 | * IRC channel on Freenode. | |
65 | * | |
66 | * @section sec_website Website | |
67 | * | |
68 | * <a href="http://sigrok.org/wiki/Libsigrok">sigrok.org/wiki/Libsigrok</a> | |
69 | */ | |
70 | ||
71 | /** | |
72 | * @file | |
73 | * | |
74 | * Initializing and shutting down libsigrok. | |
75 | */ | |
76 | ||
77 | /** | |
78 | * @defgroup grp_init Initialization | |
79 | * | |
80 | * Initializing and shutting down libsigrok. | |
81 | * | |
82 | * Before using any of the libsigrok functionality, sr_init() must | |
83 | * be called to initialize the library, which will return a struct sr_context | |
84 | * when the initialization was successful. | |
85 | * | |
86 | * When libsigrok functionality is no longer needed, sr_exit() should be | |
87 | * called, which will (among other things) free the struct sr_context. | |
88 | * | |
89 | * Example for a minimal program using libsigrok: | |
90 | * | |
91 | * @code{.c} | |
92 | * #include <stdio.h> | |
93 | * #include <libsigrok/libsigrok.h> | |
94 | * | |
95 | * int main(int argc, char **argv) | |
96 | * { | |
97 | * int ret; | |
98 | * struct sr_context *sr_ctx; | |
99 | * | |
100 | * if ((ret = sr_init(&sr_ctx)) != SR_OK) { | |
101 | * printf("Error initializing libsigrok (%s): %s.\n", | |
102 | * sr_strerror_name(ret), sr_strerror(ret)); | |
103 | * return 1; | |
104 | * } | |
105 | * | |
106 | * // Use libsigrok functions here... | |
107 | * | |
108 | * if ((ret = sr_exit(sr_ctx)) != SR_OK) { | |
109 | * printf("Error shutting down libsigrok (%s): %s.\n", | |
110 | * sr_strerror_name(ret), sr_strerror(ret)); | |
111 | * return 1; | |
112 | * } | |
113 | * | |
114 | * return 0; | |
115 | * } | |
116 | * @endcode | |
117 | * | |
118 | * @{ | |
119 | */ | |
120 | ||
121 | /** | |
122 | * Sanity-check all libsigrok drivers. | |
123 | * | |
124 | * @retval SR_OK All drivers are OK | |
125 | * @retval SR_ERR One or more drivers have issues. | |
126 | */ | |
127 | static int sanity_check_all_drivers(void) | |
128 | { | |
129 | int i, errors, ret = SR_OK; | |
130 | struct sr_dev_driver **drivers; | |
131 | const char *d; | |
132 | ||
133 | sr_spew("Sanity-checking all drivers."); | |
134 | ||
135 | drivers = sr_driver_list(); | |
136 | for (i = 0; drivers[i]; i++) { | |
137 | errors = 0; | |
138 | ||
139 | d = (drivers[i]->name) ? drivers[i]->name : "NULL"; | |
140 | ||
141 | if (!drivers[i]->name) { | |
142 | sr_err("No name in driver %d ('%s').", i, d); | |
143 | errors++; | |
144 | } | |
145 | if (!drivers[i]->longname) { | |
146 | sr_err("No longname in driver %d ('%s').", i, d); | |
147 | errors++; | |
148 | } | |
149 | if (drivers[i]->api_version < 1) { | |
150 | sr_err("API version in driver %d ('%s') < 1.", i, d); | |
151 | errors++; | |
152 | } | |
153 | if (!drivers[i]->init) { | |
154 | sr_err("No init in driver %d ('%s').", i, d); | |
155 | errors++; | |
156 | } | |
157 | if (!drivers[i]->cleanup) { | |
158 | sr_err("No cleanup in driver %d ('%s').", i, d); | |
159 | errors++; | |
160 | } | |
161 | if (!drivers[i]->scan) { | |
162 | sr_err("No scan in driver %d ('%s').", i, d); | |
163 | errors++; | |
164 | } | |
165 | if (!drivers[i]->dev_list) { | |
166 | sr_err("No dev_list in driver %d ('%s').", i, d); | |
167 | errors++; | |
168 | } | |
169 | /* Note: config_get() is optional. */ | |
170 | if (!drivers[i]->config_set) { | |
171 | sr_err("No config_set in driver %d ('%s').", i, d); | |
172 | errors++; | |
173 | } | |
174 | if (!drivers[i]->config_list) { | |
175 | sr_err("No config_list in driver %d ('%s').", i, d); | |
176 | errors++; | |
177 | } | |
178 | if (!drivers[i]->dev_open) { | |
179 | sr_err("No dev_open in driver %d ('%s').", i, d); | |
180 | errors++; | |
181 | } | |
182 | if (!drivers[i]->dev_close) { | |
183 | sr_err("No dev_close in driver %d ('%s').", i, d); | |
184 | errors++; | |
185 | } | |
186 | if (!drivers[i]->dev_acquisition_start) { | |
187 | sr_err("No dev_acquisition_start in driver %d ('%s').", | |
188 | i, d); | |
189 | errors++; | |
190 | } | |
191 | if (!drivers[i]->dev_acquisition_stop) { | |
192 | sr_err("No dev_acquisition_stop in driver %d ('%s').", | |
193 | i, d); | |
194 | errors++; | |
195 | } | |
196 | ||
197 | /* Note: 'priv' is allowed to be NULL. */ | |
198 | ||
199 | if (errors == 0) | |
200 | continue; | |
201 | ||
202 | ret = SR_ERR; | |
203 | } | |
204 | ||
205 | return ret; | |
206 | } | |
207 | ||
208 | /** | |
209 | * Sanity-check all libsigrok input modules. | |
210 | * | |
211 | * @retval SR_OK All modules are OK | |
212 | * @retval SR_ERR One or more modules have issues. | |
213 | */ | |
214 | static int sanity_check_all_input_modules(void) | |
215 | { | |
216 | int i, errors, ret = SR_OK; | |
217 | struct sr_input_format **inputs; | |
218 | const char *d; | |
219 | ||
220 | sr_spew("Sanity-checking all input modules."); | |
221 | ||
222 | inputs = sr_input_list(); | |
223 | for (i = 0; inputs[i]; i++) { | |
224 | errors = 0; | |
225 | ||
226 | d = (inputs[i]->id) ? inputs[i]->id : "NULL"; | |
227 | ||
228 | if (!inputs[i]->id) { | |
229 | sr_err("No ID in module %d ('%s').", i, d); | |
230 | errors++; | |
231 | } | |
232 | if (!inputs[i]->description) { | |
233 | sr_err("No description in module %d ('%s').", i, d); | |
234 | errors++; | |
235 | } | |
236 | if (!inputs[i]->format_match) { | |
237 | sr_err("No format_match in module %d ('%s').", i, d); | |
238 | errors++; | |
239 | } | |
240 | if (!inputs[i]->init) { | |
241 | sr_err("No init in module %d ('%s').", i, d); | |
242 | errors++; | |
243 | } | |
244 | if (!inputs[i]->loadfile) { | |
245 | sr_err("No loadfile in module %d ('%s').", i, d); | |
246 | errors++; | |
247 | } | |
248 | ||
249 | if (errors == 0) | |
250 | continue; | |
251 | ||
252 | ret = SR_ERR; | |
253 | } | |
254 | ||
255 | return ret; | |
256 | } | |
257 | ||
258 | /** | |
259 | * Sanity-check all libsigrok output modules. | |
260 | * | |
261 | * @retval SR_OK All modules are OK | |
262 | * @retval SR_ERR One or more modules have issues. | |
263 | */ | |
264 | static int sanity_check_all_output_modules(void) | |
265 | { | |
266 | int i, errors, ret = SR_OK; | |
267 | struct sr_output_format **outputs; | |
268 | const char *d; | |
269 | ||
270 | sr_spew("Sanity-checking all output modules."); | |
271 | ||
272 | outputs = sr_output_list(); | |
273 | for (i = 0; outputs[i]; i++) { | |
274 | errors = 0; | |
275 | ||
276 | d = (outputs[i]->id) ? outputs[i]->id : "NULL"; | |
277 | ||
278 | if (!outputs[i]->id) { | |
279 | sr_err("No ID in module %d ('%s').", i, d); | |
280 | errors++; | |
281 | } | |
282 | if (!outputs[i]->description) { | |
283 | sr_err("No description in module '%s'.", d); | |
284 | errors++; | |
285 | } | |
286 | if (!outputs[i]->receive) { | |
287 | sr_err("No receive in module '%s'.", d); | |
288 | errors++; | |
289 | } | |
290 | ||
291 | if (errors == 0) | |
292 | continue; | |
293 | ||
294 | ret = SR_ERR; | |
295 | } | |
296 | ||
297 | return ret; | |
298 | } | |
299 | ||
300 | /** | |
301 | * Initialize libsigrok. | |
302 | * | |
303 | * This function must be called before any other libsigrok function. | |
304 | * | |
305 | * @param ctx Pointer to a libsigrok context struct pointer. Must not be NULL. | |
306 | * This will be a pointer to a newly allocated libsigrok context | |
307 | * object upon success, and is undefined upon errors. | |
308 | * | |
309 | * @return SR_OK upon success, a (negative) error code otherwise. Upon errors | |
310 | * the 'ctx' pointer is undefined and should not be used. Upon success, | |
311 | * the context will be free'd by sr_exit() as part of the libsigrok | |
312 | * shutdown. | |
313 | * | |
314 | * @since 0.2.0 | |
315 | */ | |
316 | SR_API int sr_init(struct sr_context **ctx) | |
317 | { | |
318 | int ret = SR_ERR; | |
319 | struct sr_context *context; | |
320 | ||
321 | if (!ctx) { | |
322 | sr_err("%s(): libsigrok context was NULL.", __func__); | |
323 | return SR_ERR; | |
324 | } | |
325 | ||
326 | if (sanity_check_all_drivers() < 0) { | |
327 | sr_err("Internal driver error(s), aborting."); | |
328 | return ret; | |
329 | } | |
330 | ||
331 | if (sanity_check_all_input_modules() < 0) { | |
332 | sr_err("Internal input module error(s), aborting."); | |
333 | return ret; | |
334 | } | |
335 | ||
336 | if (sanity_check_all_output_modules() < 0) { | |
337 | sr_err("Internal output module error(s), aborting."); | |
338 | return ret; | |
339 | } | |
340 | ||
341 | /* + 1 to handle when struct sr_context has no members. */ | |
342 | context = g_try_malloc0(sizeof(struct sr_context) + 1); | |
343 | ||
344 | if (!context) { | |
345 | ret = SR_ERR_MALLOC; | |
346 | goto done; | |
347 | } | |
348 | ||
349 | #ifdef HAVE_LIBUSB_1_0 | |
350 | ret = libusb_init(&context->libusb_ctx); | |
351 | if (LIBUSB_SUCCESS != ret) { | |
352 | sr_err("libusb_init() returned %s.", libusb_error_name(ret)); | |
353 | ret = SR_ERR; | |
354 | goto done; | |
355 | } | |
356 | #endif | |
357 | ||
358 | *ctx = context; | |
359 | context = NULL; | |
360 | session = NULL; | |
361 | ret = SR_OK; | |
362 | ||
363 | done: | |
364 | if (context) | |
365 | g_free(context); | |
366 | return ret; | |
367 | } | |
368 | ||
369 | /** | |
370 | * Shutdown libsigrok. | |
371 | * | |
372 | * @param ctx Pointer to a libsigrok context struct. Must not be NULL. | |
373 | * | |
374 | * @retval SR_OK Success | |
375 | * @retval other Error code SR_ERR, ... | |
376 | * | |
377 | * @since 0.2.0 | |
378 | */ | |
379 | SR_API int sr_exit(struct sr_context *ctx) | |
380 | { | |
381 | if (!ctx) { | |
382 | sr_err("%s(): libsigrok context was NULL.", __func__); | |
383 | return SR_ERR; | |
384 | } | |
385 | ||
386 | sr_hw_cleanup_all(); | |
387 | ||
388 | #ifdef HAVE_LIBUSB_1_0 | |
389 | libusb_exit(ctx->libusb_ctx); | |
390 | #endif | |
391 | ||
392 | g_free(ctx); | |
393 | ||
394 | return SR_OK; | |
395 | } | |
396 | ||
397 | /** @} */ |