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1 | /* | |
2 | * This file is part of the sigrok 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 | /** | |
27 | * @mainpage libsigrok API | |
28 | * | |
29 | * @section sec_intro Introduction | |
30 | * | |
31 | * The <a href="http://sigrok.org">sigrok</a> project aims at creating a | |
32 | * portable, cross-platform, Free/Libre/Open-Source signal analysis software | |
33 | * suite that supports various device types (such as logic analyzers, | |
34 | * oscilloscopes, multimeters, and more). | |
35 | * | |
36 | * <a href="http://sigrok.org/wiki/Libsigrok">libsigrok</a> is a shared | |
37 | * library written in C which provides the basic API for talking to | |
38 | * <a href="http://sigrok.org/wiki/Supported_hardware">supported hardware</a> | |
39 | * and reading/writing the acquired data into various | |
40 | * <a href="http://sigrok.org/wiki/Input_output_formats">input/output | |
41 | * file formats</a>. | |
42 | * | |
43 | * @section sec_api API reference | |
44 | * | |
45 | * See the "Modules" page for an introduction to various libsigrok | |
46 | * related topics and the detailed API documentation of the respective | |
47 | * functions. | |
48 | * | |
49 | * You can also browse the API documentation by file, or review all | |
50 | * data structures. | |
51 | * | |
52 | * @section sec_mailinglists Mailing lists | |
53 | * | |
54 | * 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>. | |
55 | * | |
56 | * @section sec_irc IRC | |
57 | * | |
58 | * You can find the sigrok developers in the | |
59 | * <a href="irc://chat.freenode.net/sigrok">\#sigrok</a> | |
60 | * IRC channel on Freenode. | |
61 | * | |
62 | * @section sec_website Website | |
63 | * | |
64 | * <a href="http://sigrok.org/wiki/Libsigrok">sigrok.org/wiki/Libsigrok</a> | |
65 | */ | |
66 | ||
67 | /** | |
68 | * @file | |
69 | * | |
70 | * Initializing and shutting down libsigrok. | |
71 | */ | |
72 | ||
73 | /** | |
74 | * @defgroup grp_init Initialization | |
75 | * | |
76 | * Initializing and shutting down libsigrok. | |
77 | * | |
78 | * Before using any of the libsigrok functionality, sr_init() must | |
79 | * be called to initialize the library, which will return a struct sr_context | |
80 | * when the initialization was successful. | |
81 | * | |
82 | * When libsigrok functionality is no longer needed, sr_exit() should be | |
83 | * called, which will (among other things) free the struct sr_context. | |
84 | * | |
85 | * Example for a minimal program using libsigrok: | |
86 | * | |
87 | * @code{.c} | |
88 | * #include <stdio.h> | |
89 | * #include <libsigrok/libsigrok.h> | |
90 | * | |
91 | * int main(int argc, char **argv) | |
92 | * { | |
93 | * int ret; | |
94 | * struct sr_context *sr_ctx; | |
95 | * | |
96 | * if ((ret = sr_init(&sr_ctx)) != SR_OK) { | |
97 | * printf("Error initializing libsigrok (%s): %s.", | |
98 | * sr_strerror_name(ret), sr_strerror(ret)); | |
99 | * return 1; | |
100 | * } | |
101 | * | |
102 | * // Use libsigrok functions here... | |
103 | * | |
104 | * if ((ret = sr_exit(sr_ctx)) != SR_OK) { | |
105 | * printf("Error shutting down libsigrok (%s): %s.", | |
106 | * sr_strerror_name(ret), sr_strerror(ret)); | |
107 | * return 1; | |
108 | * } | |
109 | * | |
110 | * return 0; | |
111 | * } | |
112 | * @endcode | |
113 | * | |
114 | * @{ | |
115 | */ | |
116 | ||
117 | /** | |
118 | * Sanity-check all libsigrok drivers. | |
119 | * | |
120 | * @return SR_OK if all drivers are OK, SR_ERR if one or more have issues. | |
121 | */ | |
122 | static int sanity_check_all_drivers(void) | |
123 | { | |
124 | int i, errors, ret = SR_OK; | |
125 | struct sr_dev_driver **drivers; | |
126 | const char *d; | |
127 | ||
128 | sr_spew("Sanity-checking all drivers."); | |
129 | ||
130 | drivers = sr_driver_list(); | |
131 | for (i = 0; drivers[i]; i++) { | |
132 | errors = 0; | |
133 | ||
134 | d = (drivers[i]->name) ? drivers[i]->name : "NULL"; | |
135 | ||
136 | if (!drivers[i]->name) { | |
137 | sr_err("No name in driver %d ('%s').", i, d); | |
138 | errors++; | |
139 | } | |
140 | if (!drivers[i]->longname) { | |
141 | sr_err("No longname in driver %d ('%s').", i, d); | |
142 | errors++; | |
143 | } | |
144 | if (drivers[i]->api_version < 1) { | |
145 | sr_err("API version in driver %d ('%s') < 1.", i, d); | |
146 | errors++; | |
147 | } | |
148 | if (!drivers[i]->init) { | |
149 | sr_err("No init in driver %d ('%s').", i, d); | |
150 | errors++; | |
151 | } | |
152 | if (!drivers[i]->cleanup) { | |
153 | sr_err("No cleanup in driver %d ('%s').", i, d); | |
154 | errors++; | |
155 | } | |
156 | if (!drivers[i]->scan) { | |
157 | sr_err("No scan in driver %d ('%s').", i, d); | |
158 | errors++; | |
159 | } | |
160 | if (!drivers[i]->dev_list) { | |
161 | sr_err("No dev_list in driver %d ('%s').", i, d); | |
162 | errors++; | |
163 | } | |
164 | if (!drivers[i]->dev_clear) { | |
165 | sr_err("No dev_clear in driver %d ('%s').", i, d); | |
166 | errors++; | |
167 | } | |
168 | /* Note: config_get() is optional. */ | |
169 | if (!drivers[i]->config_set) { | |
170 | sr_err("No config_set in driver %d ('%s').", i, d); | |
171 | errors++; | |
172 | } | |
173 | if (!drivers[i]->config_list) { | |
174 | sr_err("No config_list in driver %d ('%s').", i, d); | |
175 | errors++; | |
176 | } | |
177 | if (!drivers[i]->dev_open) { | |
178 | sr_err("No dev_open in driver %d ('%s').", i, d); | |
179 | errors++; | |
180 | } | |
181 | if (!drivers[i]->dev_close) { | |
182 | sr_err("No dev_close in driver %d ('%s').", i, d); | |
183 | errors++; | |
184 | } | |
185 | if (!drivers[i]->dev_acquisition_start) { | |
186 | sr_err("No dev_acquisition_start in driver %d ('%s').", | |
187 | i, d); | |
188 | errors++; | |
189 | } | |
190 | if (!drivers[i]->dev_acquisition_stop) { | |
191 | sr_err("No dev_acquisition_stop in driver %d ('%s').", | |
192 | i, d); | |
193 | errors++; | |
194 | } | |
195 | ||
196 | /* Note: 'priv' is allowed to be NULL. */ | |
197 | ||
198 | if (errors == 0) | |
199 | continue; | |
200 | ||
201 | ret = SR_ERR; | |
202 | } | |
203 | ||
204 | return ret; | |
205 | } | |
206 | ||
207 | /** | |
208 | * Initialize libsigrok. | |
209 | * | |
210 | * This function must be called before any other libsigrok function. | |
211 | * | |
212 | * @param ctx Pointer to a libsigrok context struct pointer. Must not be NULL. | |
213 | * This will be a pointer to a newly allocated libsigrok context | |
214 | * object upon success, and is undefined upon errors. | |
215 | * | |
216 | * @return SR_OK upon success, a (negative) error code otherwise. Upon errors | |
217 | * the 'ctx' pointer is undefined and should not be used. Upon success, | |
218 | * the context will be free'd by sr_exit() as part of the libsigrok | |
219 | * shutdown. | |
220 | */ | |
221 | SR_API int sr_init(struct sr_context **ctx) | |
222 | { | |
223 | int ret = SR_ERR; | |
224 | struct sr_context *context; | |
225 | ||
226 | if (!ctx) { | |
227 | sr_err("%s(): libsigrok context was NULL.", __func__); | |
228 | return SR_ERR; | |
229 | } | |
230 | ||
231 | if (sanity_check_all_drivers() < 0) { | |
232 | sr_err("Internal driver error(s), aborting."); | |
233 | return ret; | |
234 | } | |
235 | ||
236 | /* + 1 to handle when struct sr_context has no members. */ | |
237 | context = g_try_malloc0(sizeof(struct sr_context) + 1); | |
238 | ||
239 | if (!context) { | |
240 | ret = SR_ERR_MALLOC; | |
241 | goto done; | |
242 | } | |
243 | ||
244 | #ifdef HAVE_LIBUSB_1_0 | |
245 | ret = libusb_init(&context->libusb_ctx); | |
246 | if (LIBUSB_SUCCESS != ret) { | |
247 | sr_err("libusb_init() returned %s.\n", libusb_error_name(ret)); | |
248 | ret = SR_ERR; | |
249 | goto done; | |
250 | } | |
251 | #endif | |
252 | ||
253 | *ctx = context; | |
254 | context = NULL; | |
255 | ret = SR_OK; | |
256 | ||
257 | done: | |
258 | if (context) | |
259 | g_free(context); | |
260 | return ret; | |
261 | } | |
262 | ||
263 | /** | |
264 | * Shutdown libsigrok. | |
265 | * | |
266 | * @param ctx Pointer to a libsigrok context struct. Must not be NULL. | |
267 | * | |
268 | * @return SR_OK upon success, a (negative) error code otherwise. | |
269 | */ | |
270 | SR_API int sr_exit(struct sr_context *ctx) | |
271 | { | |
272 | if (!ctx) { | |
273 | sr_err("%s(): libsigrok context was NULL.", __func__); | |
274 | return SR_ERR; | |
275 | } | |
276 | ||
277 | sr_hw_cleanup_all(); | |
278 | ||
279 | #ifdef HAVE_LIBUSB_1_0 | |
280 | libusb_exit(ctx->libusb_ctx); | |
281 | #endif | |
282 | ||
283 | g_free(ctx); | |
284 | ||
285 | return SR_OK; | |
286 | } | |
287 | ||
288 | /** @} */ |