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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 | /** @cond PRIVATE */ | |
27 | #define LOG_PREFIX "backend" | |
28 | /** @endcond */ | |
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 is one mailing list for sigrok/libsigrok: <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-devel">sigrok-devel</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 (except | |
83 | * sr_log_loglevel_set() and sr_log_opts_set()), sr_init() must | |
84 | * be called to initialize the library, which will return a struct sr_context | |
85 | * when the initialization was successful. | |
86 | * | |
87 | * When libsigrok functionality is no longer needed, sr_exit() should be | |
88 | * called, which will (among other things) free the struct sr_context. | |
89 | * | |
90 | * Example for a minimal program using libsigrok: | |
91 | * | |
92 | * @code{.c} | |
93 | * #include <stdio.h> | |
94 | * #include <libsigrok/libsigrok.h> | |
95 | * | |
96 | * int main(int argc, char **argv) | |
97 | * { | |
98 | * int ret; | |
99 | * struct sr_context *sr_ctx; | |
100 | * | |
101 | * if ((ret = sr_init(&sr_ctx)) != SR_OK) { | |
102 | * printf("Error initializing libsigrok (%s): %s.\n", | |
103 | * sr_strerror_name(ret), sr_strerror(ret)); | |
104 | * return 1; | |
105 | * } | |
106 | * | |
107 | * // Use libsigrok functions here... | |
108 | * | |
109 | * if ((ret = sr_exit(sr_ctx)) != SR_OK) { | |
110 | * printf("Error shutting down libsigrok (%s): %s.\n", | |
111 | * sr_strerror_name(ret), sr_strerror(ret)); | |
112 | * return 1; | |
113 | * } | |
114 | * | |
115 | * return 0; | |
116 | * } | |
117 | * @endcode | |
118 | * | |
119 | * @{ | |
120 | */ | |
121 | ||
122 | /** | |
123 | * Sanity-check all libsigrok drivers. | |
124 | * | |
125 | * @param[in] ctx Pointer to a libsigrok context struct. Must not be NULL. | |
126 | * | |
127 | * @retval SR_OK All drivers are OK | |
128 | * @retval SR_ERR One or more drivers have issues. | |
129 | * @retval SR_ERR_ARG Invalid argument. | |
130 | */ | |
131 | static int sanity_check_all_drivers(const struct sr_context *ctx) | |
132 | { | |
133 | int i, errors, ret = SR_OK; | |
134 | struct sr_dev_driver **drivers; | |
135 | const char *d; | |
136 | ||
137 | if (!ctx) | |
138 | return SR_ERR_ARG; | |
139 | ||
140 | sr_spew("Sanity-checking all drivers."); | |
141 | ||
142 | drivers = sr_driver_list(ctx); | |
143 | for (i = 0; drivers[i]; i++) { | |
144 | errors = 0; | |
145 | ||
146 | d = (drivers[i]->name) ? drivers[i]->name : "NULL"; | |
147 | ||
148 | if (!drivers[i]->name) { | |
149 | sr_err("No name in driver %d ('%s').", i, d); | |
150 | errors++; | |
151 | } | |
152 | if (!drivers[i]->longname) { | |
153 | sr_err("No longname in driver %d ('%s').", i, d); | |
154 | errors++; | |
155 | } | |
156 | if (drivers[i]->api_version < 1) { | |
157 | sr_err("API version in driver %d ('%s') < 1.", i, d); | |
158 | errors++; | |
159 | } | |
160 | if (!drivers[i]->init) { | |
161 | sr_err("No init in driver %d ('%s').", i, d); | |
162 | errors++; | |
163 | } | |
164 | if (!drivers[i]->cleanup) { | |
165 | sr_err("No cleanup in driver %d ('%s').", i, d); | |
166 | errors++; | |
167 | } | |
168 | if (!drivers[i]->scan) { | |
169 | sr_err("No scan in driver %d ('%s').", i, d); | |
170 | errors++; | |
171 | } | |
172 | if (!drivers[i]->dev_list) { | |
173 | sr_err("No dev_list in driver %d ('%s').", i, d); | |
174 | errors++; | |
175 | } | |
176 | /* Note: config_get() is optional. */ | |
177 | if (!drivers[i]->config_set) { | |
178 | sr_err("No config_set in driver %d ('%s').", i, d); | |
179 | errors++; | |
180 | } | |
181 | if (!drivers[i]->config_list) { | |
182 | sr_err("No config_list in driver %d ('%s').", i, d); | |
183 | errors++; | |
184 | } | |
185 | if (!drivers[i]->dev_open) { | |
186 | sr_err("No dev_open in driver %d ('%s').", i, d); | |
187 | errors++; | |
188 | } | |
189 | if (!drivers[i]->dev_close) { | |
190 | sr_err("No dev_close in driver %d ('%s').", i, d); | |
191 | errors++; | |
192 | } | |
193 | if (!drivers[i]->dev_acquisition_start) { | |
194 | sr_err("No dev_acquisition_start in driver %d ('%s').", | |
195 | i, d); | |
196 | errors++; | |
197 | } | |
198 | if (!drivers[i]->dev_acquisition_stop) { | |
199 | sr_err("No dev_acquisition_stop in driver %d ('%s').", | |
200 | i, d); | |
201 | errors++; | |
202 | } | |
203 | ||
204 | /* Note: 'priv' is allowed to be NULL. */ | |
205 | ||
206 | if (errors == 0) | |
207 | continue; | |
208 | ||
209 | ret = SR_ERR; | |
210 | } | |
211 | ||
212 | return ret; | |
213 | } | |
214 | ||
215 | /** | |
216 | * Sanity-check all libsigrok input modules. | |
217 | * | |
218 | * @retval SR_OK All modules are OK | |
219 | * @retval SR_ERR One or more modules have issues. | |
220 | */ | |
221 | static int sanity_check_all_input_modules(void) | |
222 | { | |
223 | int i, errors, ret = SR_OK; | |
224 | const struct sr_input_module **inputs; | |
225 | const char *d; | |
226 | ||
227 | sr_spew("Sanity-checking all input modules."); | |
228 | ||
229 | inputs = sr_input_list(); | |
230 | for (i = 0; inputs[i]; i++) { | |
231 | errors = 0; | |
232 | ||
233 | d = (inputs[i]->id) ? inputs[i]->id : "NULL"; | |
234 | ||
235 | if (!inputs[i]->id) { | |
236 | sr_err("No ID in module %d ('%s').", i, d); | |
237 | errors++; | |
238 | } | |
239 | if (!inputs[i]->name) { | |
240 | sr_err("No name in module %d ('%s').", i, d); | |
241 | errors++; | |
242 | } | |
243 | if (!inputs[i]->desc) { | |
244 | sr_err("No description in module %d ('%s').", i, d); | |
245 | errors++; | |
246 | } | |
247 | if (!inputs[i]->init) { | |
248 | sr_err("No init in module %d ('%s').", i, d); | |
249 | errors++; | |
250 | } | |
251 | if (!inputs[i]->receive) { | |
252 | sr_err("No receive in module %d ('%s').", i, d); | |
253 | errors++; | |
254 | } | |
255 | if (!inputs[i]->end) { | |
256 | sr_err("No end in module %d ('%s').", i, d); | |
257 | errors++; | |
258 | } | |
259 | ||
260 | if (errors == 0) | |
261 | continue; | |
262 | ||
263 | ret = SR_ERR; | |
264 | } | |
265 | ||
266 | return ret; | |
267 | } | |
268 | ||
269 | /** | |
270 | * Sanity-check all libsigrok output modules. | |
271 | * | |
272 | * @retval SR_OK All modules are OK | |
273 | * @retval SR_ERR One or more modules have issues. | |
274 | */ | |
275 | static int sanity_check_all_output_modules(void) | |
276 | { | |
277 | int i, errors, ret = SR_OK; | |
278 | const struct sr_output_module **outputs; | |
279 | const char *d; | |
280 | ||
281 | sr_spew("Sanity-checking all output modules."); | |
282 | ||
283 | outputs = sr_output_list(); | |
284 | for (i = 0; outputs[i]; i++) { | |
285 | errors = 0; | |
286 | ||
287 | d = (outputs[i]->id) ? outputs[i]->id : "NULL"; | |
288 | ||
289 | if (!outputs[i]->id) { | |
290 | sr_err("No ID in module %d ('%s').", i, d); | |
291 | errors++; | |
292 | } | |
293 | if (!outputs[i]->name) { | |
294 | sr_err("No name in module %d ('%s').", i, d); | |
295 | errors++; | |
296 | } | |
297 | if (!outputs[i]->desc) { | |
298 | sr_err("No description in module '%s'.", d); | |
299 | errors++; | |
300 | } | |
301 | if (!outputs[i]->receive) { | |
302 | sr_err("No receive in module '%s'.", d); | |
303 | errors++; | |
304 | } | |
305 | ||
306 | if (errors == 0) | |
307 | continue; | |
308 | ||
309 | ret = SR_ERR; | |
310 | } | |
311 | ||
312 | return ret; | |
313 | } | |
314 | ||
315 | /** | |
316 | * Sanity-check all libsigrok transform modules. | |
317 | * | |
318 | * @retval SR_OK All modules are OK | |
319 | * @retval SR_ERR One or more modules have issues. | |
320 | */ | |
321 | static int sanity_check_all_transform_modules(void) | |
322 | { | |
323 | int i, errors, ret = SR_OK; | |
324 | const struct sr_transform_module **transforms; | |
325 | const char *d; | |
326 | ||
327 | sr_spew("Sanity-checking all transform modules."); | |
328 | ||
329 | transforms = sr_transform_list(); | |
330 | for (i = 0; transforms[i]; i++) { | |
331 | errors = 0; | |
332 | ||
333 | d = (transforms[i]->id) ? transforms[i]->id : "NULL"; | |
334 | ||
335 | if (!transforms[i]->id) { | |
336 | sr_err("No ID in module %d ('%s').", i, d); | |
337 | errors++; | |
338 | } | |
339 | if (!transforms[i]->name) { | |
340 | sr_err("No name in module %d ('%s').", i, d); | |
341 | errors++; | |
342 | } | |
343 | if (!transforms[i]->desc) { | |
344 | sr_err("No description in module '%s'.", d); | |
345 | errors++; | |
346 | } | |
347 | /* Note: options() is optional. */ | |
348 | /* Note: init() is optional. */ | |
349 | if (!transforms[i]->receive) { | |
350 | sr_err("No receive in module '%s'.", d); | |
351 | errors++; | |
352 | } | |
353 | /* Note: cleanup() is optional. */ | |
354 | ||
355 | if (errors == 0) | |
356 | continue; | |
357 | ||
358 | ret = SR_ERR; | |
359 | } | |
360 | ||
361 | return ret; | |
362 | } | |
363 | ||
364 | /** | |
365 | * Initialize libsigrok. | |
366 | * | |
367 | * This function must be called before any other libsigrok function. | |
368 | * | |
369 | * @param ctx Pointer to a libsigrok context struct pointer. Must not be NULL. | |
370 | * This will be a pointer to a newly allocated libsigrok context | |
371 | * object upon success, and is undefined upon errors. | |
372 | * | |
373 | * @return SR_OK upon success, a (negative) error code otherwise. Upon errors | |
374 | * the 'ctx' pointer is undefined and should not be used. Upon success, | |
375 | * the context will be free'd by sr_exit() as part of the libsigrok | |
376 | * shutdown. | |
377 | * | |
378 | * @since 0.2.0 | |
379 | */ | |
380 | SR_API int sr_init(struct sr_context **ctx) | |
381 | { | |
382 | int ret = SR_ERR; | |
383 | struct sr_context *context; | |
384 | struct sr_dev_driver ***lists, **drivers; | |
385 | GArray *array; | |
386 | ||
387 | if (!ctx) { | |
388 | sr_err("%s(): libsigrok context was NULL.", __func__); | |
389 | return SR_ERR; | |
390 | } | |
391 | ||
392 | context = g_malloc0(sizeof(struct sr_context)); | |
393 | ||
394 | /* Generate ctx->driver_list at runtime. */ | |
395 | array = g_array_new(TRUE, FALSE, sizeof(struct sr_dev_driver *)); | |
396 | for (lists = drivers_lists; *lists; lists++) | |
397 | for (drivers = *lists; *drivers; drivers++) | |
398 | g_array_append_val(array, *drivers); | |
399 | context->driver_list = (struct sr_dev_driver **)array->data; | |
400 | g_array_free(array, FALSE); | |
401 | ||
402 | if (sanity_check_all_drivers(context) < 0) { | |
403 | sr_err("Internal driver error(s), aborting."); | |
404 | return ret; | |
405 | } | |
406 | ||
407 | if (sanity_check_all_input_modules() < 0) { | |
408 | sr_err("Internal input module error(s), aborting."); | |
409 | return ret; | |
410 | } | |
411 | ||
412 | if (sanity_check_all_output_modules() < 0) { | |
413 | sr_err("Internal output module error(s), aborting."); | |
414 | return ret; | |
415 | } | |
416 | ||
417 | if (sanity_check_all_transform_modules() < 0) { | |
418 | sr_err("Internal transform module error(s), aborting."); | |
419 | return ret; | |
420 | } | |
421 | ||
422 | #ifdef HAVE_LIBUSB_1_0 | |
423 | ret = libusb_init(&context->libusb_ctx); | |
424 | if (LIBUSB_SUCCESS != ret) { | |
425 | sr_err("libusb_init() returned %s.", libusb_error_name(ret)); | |
426 | ret = SR_ERR; | |
427 | goto done; | |
428 | } | |
429 | #endif | |
430 | ||
431 | *ctx = context; | |
432 | context = NULL; | |
433 | ret = SR_OK; | |
434 | ||
435 | #ifdef HAVE_LIBUSB_1_0 | |
436 | done: | |
437 | #endif | |
438 | g_free(context); | |
439 | return ret; | |
440 | } | |
441 | ||
442 | /** | |
443 | * Shutdown libsigrok. | |
444 | * | |
445 | * @param ctx Pointer to a libsigrok context struct. Must not be NULL. | |
446 | * | |
447 | * @retval SR_OK Success | |
448 | * @retval other Error code SR_ERR, ... | |
449 | * | |
450 | * @since 0.2.0 | |
451 | */ | |
452 | SR_API int sr_exit(struct sr_context *ctx) | |
453 | { | |
454 | if (!ctx) { | |
455 | sr_err("%s(): libsigrok context was NULL.", __func__); | |
456 | return SR_ERR; | |
457 | } | |
458 | ||
459 | sr_hw_cleanup_all(ctx); | |
460 | ||
461 | #ifdef HAVE_LIBUSB_1_0 | |
462 | libusb_exit(ctx->libusb_ctx); | |
463 | #endif | |
464 | ||
465 | g_free(sr_driver_list(ctx)); | |
466 | g_free(ctx); | |
467 | ||
468 | return SR_OK; | |
469 | } | |
470 | ||
471 | /** @} */ |