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1 | /* | |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * Copyright (C) 2012 Bert Vermeulen <bert@biot.com> | |
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 "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */ | |
22 | #include "sigrokdecode-internal.h" | |
23 | #include "config.h" | |
24 | #include <glib.h> | |
25 | #include <inttypes.h> | |
26 | ||
27 | ||
28 | static GSList *di_list = NULL; | |
29 | static GSList *callbacks = NULL; | |
30 | ||
31 | /* lives in decoder.c */ | |
32 | extern GSList *pd_list; | |
33 | ||
34 | /* lives in module_sigrokdecode.c */ | |
35 | extern PyMODINIT_FUNC PyInit_sigrokdecode(void); | |
36 | ||
37 | /* lives in type_logic.c */ | |
38 | extern PyTypeObject srd_logic_type; | |
39 | ||
40 | ||
41 | /** | |
42 | * Initialize libsigrokdecode. | |
43 | * | |
44 | * This initializes the Python interpreter, and creates and initializes | |
45 | * a "sigrok" Python module with a single put() method. | |
46 | * | |
47 | * Then, it searches for sigrok protocol decoder files (*.py) in the | |
48 | * "decoders" subdirectory of the the sigrok installation directory. | |
49 | * All decoders that are found are loaded into memory and added to an | |
50 | * internal list of decoders, which can be queried via srd_list_decoders(). | |
51 | * | |
52 | * The caller is responsible for calling the clean-up function srd_exit(), | |
53 | * which will properly shut down libsigrokdecode and free its allocated memory. | |
54 | * | |
55 | * Multiple calls to srd_init(), without calling srd_exit() in between, | |
56 | * are not allowed. | |
57 | * | |
58 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
59 | * Upon Python errors, return SRD_ERR_PYTHON. If the sigrok decoders | |
60 | * directory cannot be accessed, return SRD_ERR_DECODERS_DIR. | |
61 | * If not enough memory could be allocated, return SRD_ERR_MALLOC. | |
62 | */ | |
63 | int srd_init(void) | |
64 | { | |
65 | int ret; | |
66 | ||
67 | PyImport_AppendInittab("sigrokdecode", PyInit_sigrokdecode); | |
68 | ||
69 | /* Py_Initialize() returns void and usually cannot fail. */ | |
70 | Py_Initialize(); | |
71 | ||
72 | if ((ret = set_modulepath()) != SRD_OK) { | |
73 | Py_Finalize(); | |
74 | return ret; | |
75 | } | |
76 | ||
77 | if ((ret = srd_load_all_decoders()) != SRD_OK) { | |
78 | Py_Finalize(); | |
79 | return ret; | |
80 | } | |
81 | ||
82 | return SRD_OK; | |
83 | } | |
84 | ||
85 | ||
86 | /** | |
87 | * Shutdown libsigrokdecode. | |
88 | * | |
89 | * This frees all the memory allocated for protocol decoders and shuts down | |
90 | * the Python interpreter. | |
91 | * | |
92 | * This function should only be called if there was a (successful!) invocation | |
93 | * of srd_init() before. Calling this function multiple times in a row, without | |
94 | * any successful srd_init() calls in between, is not allowed. | |
95 | * | |
96 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
97 | */ | |
98 | int srd_exit(void) | |
99 | { | |
100 | /* Unload/free all decoders, and then the list of decoders itself. */ | |
101 | /* TODO: Error handling. */ | |
102 | srd_unload_all_decoders(); | |
103 | g_slist_free(pd_list); | |
104 | ||
105 | /* Py_Finalize() returns void, any finalization errors are ignored. */ | |
106 | Py_Finalize(); | |
107 | ||
108 | return SRD_OK; | |
109 | } | |
110 | ||
111 | ||
112 | /** | |
113 | * Add search directories for the protocol decoders. | |
114 | * | |
115 | * TODO: add path from env var SIGROKDECODE_PATH, config etc | |
116 | */ | |
117 | int set_modulepath(void) | |
118 | { | |
119 | int ret; | |
120 | ||
121 | PyRun_SimpleString("import sys"); | |
122 | ret = PyRun_SimpleString("sys.path.append(r'" DECODERS_DIR "');"); | |
123 | ||
124 | return ret; | |
125 | } | |
126 | ||
127 | ||
128 | /** | |
129 | * Create a new protocol decoder instance. | |
130 | * | |
131 | * TODO: this should be a decoder name, as decoder ids will disappear. | |
132 | * | |
133 | * @param id Decoder 'id' field. | |
134 | * @param instance_id Optional unique identifier for this instance. If NULL, | |
135 | * the 'id' parameter is used. | |
136 | * @return Pointer to a newly allocated struct srd_decoder_instance, or | |
137 | * NULL in case of failure. | |
138 | */ | |
139 | struct srd_decoder_instance *srd_instance_new(const char *id, | |
140 | const char *instance_id) | |
141 | { | |
142 | struct srd_decoder *dec; | |
143 | struct srd_decoder_instance *di; | |
144 | PyObject *py_args; | |
145 | ||
146 | srd_dbg("%s: creating new %s instance", __func__, id); | |
147 | ||
148 | if (!(dec = srd_get_decoder_by_id(id))) | |
149 | return NULL; | |
150 | ||
151 | if (!(di = g_try_malloc(sizeof(*di)))) { | |
152 | srd_err("failed to malloc instance"); | |
153 | return NULL; | |
154 | } | |
155 | di->decoder = dec; | |
156 | di->instance_id = g_strdup(instance_id ? instance_id : id); | |
157 | di->pd_output = NULL; | |
158 | di->num_probes = 0; | |
159 | di->unitsize = 0; | |
160 | di->samplerate = 0; | |
161 | di->next_di = NULL; | |
162 | ||
163 | /* Create an empty Python tuple. */ | |
164 | if (!(py_args = PyTuple_New(0))) { /* NEWREF */ | |
165 | if (PyErr_Occurred()) | |
166 | PyErr_Print(); | |
167 | return NULL; | |
168 | } | |
169 | ||
170 | /* Create an instance of the 'Decoder' class. */ | |
171 | di->py_instance = PyObject_Call(dec->py_dec, py_args, NULL); | |
172 | if (!di->py_instance) { | |
173 | if (PyErr_Occurred()) | |
174 | PyErr_Print(); | |
175 | Py_XDECREF(py_args); | |
176 | return NULL; | |
177 | } | |
178 | ||
179 | /* Instance takes input from a frontend by default. */ | |
180 | di_list = g_slist_append(di_list, di); | |
181 | ||
182 | Py_XDECREF(py_args); | |
183 | ||
184 | return di; | |
185 | } | |
186 | ||
187 | int srd_instance_stack(struct srd_decoder_instance *di_from, | |
188 | struct srd_decoder_instance *di_to) | |
189 | { | |
190 | ||
191 | if (!di_from || !di_to) { | |
192 | srd_err("invalid from/to instance pair"); | |
193 | return SRD_ERR_ARG; | |
194 | } | |
195 | ||
196 | if (!g_slist_find(di_list, di_from)) { | |
197 | srd_err("unstacked instance not found"); | |
198 | return SRD_ERR_ARG; | |
199 | } | |
200 | ||
201 | /* Remove from the unstacked list. */ | |
202 | di_list = g_slist_remove(di_list, di_to); | |
203 | ||
204 | /* Stack on top of source di. */ | |
205 | di_from->next_di = g_slist_append(di_from->next_di, di_to); | |
206 | ||
207 | return SRD_OK; | |
208 | } | |
209 | ||
210 | ||
211 | int srd_instance_set_probe(struct srd_decoder_instance *di, | |
212 | const char *probename, int num) | |
213 | { | |
214 | PyObject *probedict, *probenum; | |
215 | ||
216 | probedict = PyObject_GetAttrString(di->py_instance, "probes"); /* NEWREF */ | |
217 | if (!probedict) { | |
218 | if (PyErr_Occurred()) | |
219 | PyErr_Print(); /* Returns void. */ | |
220 | ||
221 | return SRD_ERR_PYTHON; /* TODO: More specific error? */ | |
222 | } | |
223 | ||
224 | probenum = PyLong_FromLong(num); | |
225 | PyMapping_SetItemString(probedict, (char *)probename, probenum); | |
226 | ||
227 | Py_XDECREF(probenum); | |
228 | Py_XDECREF(probedict); | |
229 | ||
230 | return SRD_OK; | |
231 | } | |
232 | ||
233 | /* TODO: this should go into the PD stack */ | |
234 | struct srd_decoder_instance *srd_instance_find(char *instance_id) | |
235 | { | |
236 | GSList *l; | |
237 | struct srd_decoder_instance *tmp, *di; | |
238 | ||
239 | di = NULL; | |
240 | for (l = di_list; l; l = l->next) { | |
241 | tmp = l->data; | |
242 | if (!strcmp(tmp->instance_id, instance_id)) { | |
243 | di = tmp; | |
244 | break; | |
245 | } | |
246 | } | |
247 | ||
248 | return di; | |
249 | } | |
250 | ||
251 | int srd_instance_start(struct srd_decoder_instance *di, PyObject *args) | |
252 | { | |
253 | PyObject *py_name, *py_res; | |
254 | ||
255 | srd_dbg("calling start() method on protocol decoder instance %s", di->instance_id); | |
256 | ||
257 | if (!(py_name = PyUnicode_FromString("start"))) { | |
258 | srd_err("unable to build python object for 'start'"); | |
259 | if (PyErr_Occurred()) | |
260 | PyErr_Print(); | |
261 | return SRD_ERR_PYTHON; | |
262 | } | |
263 | ||
264 | if (!(py_res = PyObject_CallMethodObjArgs(di->py_instance, | |
265 | py_name, args, NULL))) { | |
266 | if (PyErr_Occurred()) | |
267 | PyErr_Print(); | |
268 | return SRD_ERR_PYTHON; | |
269 | } | |
270 | ||
271 | Py_XDECREF(py_res); | |
272 | Py_DECREF(py_name); | |
273 | ||
274 | return SRD_OK; | |
275 | } | |
276 | ||
277 | /** | |
278 | * Run the specified decoder function. | |
279 | * | |
280 | * @param dec TODO | |
281 | * @param inbuf TODO | |
282 | * @param inbuflen TODO | |
283 | * | |
284 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
285 | */ | |
286 | int srd_instance_decode(uint64_t start_samplenum, | |
287 | struct srd_decoder_instance *di, uint8_t *inbuf, uint64_t inbuflen) | |
288 | { | |
289 | PyObject *py_instance, *py_res; | |
290 | srd_logic *logic; | |
291 | uint64_t end_samplenum; | |
292 | ||
293 | /* Return an error upon unusable input. */ | |
294 | if (di == NULL) | |
295 | return SRD_ERR_ARG; /* TODO: More specific error? */ | |
296 | if (inbuf == NULL) | |
297 | return SRD_ERR_ARG; /* TODO: More specific error? */ | |
298 | if (inbuflen == 0) /* No point in working on empty buffers. */ | |
299 | return SRD_ERR_ARG; /* TODO: More specific error? */ | |
300 | ||
301 | /* TODO: Error handling. */ | |
302 | py_instance = di->py_instance; | |
303 | Py_XINCREF(py_instance); | |
304 | ||
305 | logic = PyObject_New(srd_logic, &srd_logic_type); | |
306 | Py_INCREF(logic); | |
307 | logic->di = di; | |
308 | logic->start_samplenum = start_samplenum; | |
309 | logic->itercnt = 0; | |
310 | logic->inbuf = inbuf; | |
311 | logic->inbuflen = inbuflen; | |
312 | logic->sample = PyList_New(2); | |
313 | Py_INCREF(logic->sample); | |
314 | ||
315 | end_samplenum = start_samplenum + inbuflen / di->unitsize; | |
316 | if (!(py_res = PyObject_CallMethod(py_instance, "decode", | |
317 | "KKO", logic->start_samplenum, end_samplenum, logic))) { | |
318 | if (PyErr_Occurred()) | |
319 | PyErr_Print(); /* Returns void. */ | |
320 | ||
321 | return SRD_ERR_PYTHON; /* TODO: More specific error? */ | |
322 | } | |
323 | ||
324 | Py_XDECREF(py_res); | |
325 | ||
326 | return SRD_OK; | |
327 | } | |
328 | ||
329 | ||
330 | int srd_session_start(int num_probes, int unitsize, uint64_t samplerate) | |
331 | { | |
332 | PyObject *args; | |
333 | GSList *d, *s; | |
334 | struct srd_decoder_instance *di; | |
335 | int ret; | |
336 | ||
337 | if (!(args = Py_BuildValue("{s:l}", "samplerate", (long)samplerate))) { | |
338 | srd_err("unable to build python object for metadata"); | |
339 | return SRD_ERR_PYTHON; | |
340 | } | |
341 | ||
342 | /* Run the start() method on all decoders receiving frontend data. */ | |
343 | for (d = di_list; d; d = d->next) { | |
344 | di = d->data; | |
345 | di->num_probes = num_probes; | |
346 | di->unitsize = unitsize; | |
347 | di->samplerate = samplerate; | |
348 | if ((ret = srd_instance_start(di, args) != SRD_OK)) | |
349 | return ret; | |
350 | ||
351 | /* Run the start() method on all decoders up the stack from this one. */ | |
352 | for (s = di->next_di; s; s = s->next) { | |
353 | /* These don't need probes, unitsize and samplerate. */ | |
354 | di = s->data; | |
355 | if ((ret = srd_instance_start(di, args) != SRD_OK)) | |
356 | return ret; | |
357 | } | |
358 | } | |
359 | ||
360 | Py_DECREF(args); | |
361 | ||
362 | return SRD_OK; | |
363 | } | |
364 | ||
365 | /* Feed logic samples to decoder session. */ | |
366 | int srd_session_feed(uint64_t start_samplenum, uint8_t *inbuf, uint64_t inbuflen) | |
367 | { | |
368 | GSList *d; | |
369 | int ret; | |
370 | ||
371 | for (d = di_list; d; d = d->next) { | |
372 | if ((ret = srd_instance_decode(start_samplenum, d->data, inbuf, | |
373 | inbuflen)) != SRD_OK) | |
374 | return ret; | |
375 | } | |
376 | ||
377 | return SRD_OK; | |
378 | } | |
379 | ||
380 | ||
381 | int pd_add(struct srd_decoder_instance *di, int output_type, | |
382 | char *proto_id) | |
383 | { | |
384 | struct srd_pd_output *pdo; | |
385 | ||
386 | if (!(pdo = g_try_malloc(sizeof(struct srd_pd_output)))) | |
387 | return -1; | |
388 | ||
389 | /* pdo_id is just a simple index, nothing is deleted from this list anyway. */ | |
390 | pdo->pdo_id = g_slist_length(di->pd_output); | |
391 | pdo->output_type = output_type; | |
392 | pdo->decoder = di->decoder; | |
393 | pdo->proto_id = g_strdup(proto_id); | |
394 | di->pd_output = g_slist_append(di->pd_output, pdo); | |
395 | ||
396 | return pdo->pdo_id; | |
397 | } | |
398 | ||
399 | struct srd_decoder_instance *get_di_by_decobject(void *decobject) | |
400 | { | |
401 | GSList *l, *s; | |
402 | struct srd_decoder_instance *di; | |
403 | ||
404 | for (l = di_list; l; l = l->next) { | |
405 | di = l->data; | |
406 | if (decobject == di->py_instance) | |
407 | return di; | |
408 | /* Check decoders stacked on top of this one. */ | |
409 | for (s = di->next_di; s; s = s->next) { | |
410 | di = s->data; | |
411 | if (decobject == di->py_instance) | |
412 | return di; | |
413 | } | |
414 | } | |
415 | ||
416 | return NULL; | |
417 | } | |
418 | ||
419 | int srd_register_callback(int output_type, void *cb) | |
420 | { | |
421 | struct srd_pd_callback *pd_cb; | |
422 | ||
423 | if (!(pd_cb = g_try_malloc(sizeof(struct srd_pd_callback)))) | |
424 | return SRD_ERR_MALLOC; | |
425 | ||
426 | pd_cb->output_type = output_type; | |
427 | pd_cb->callback = cb; | |
428 | callbacks = g_slist_append(callbacks, pd_cb); | |
429 | ||
430 | return SRD_OK; | |
431 | } | |
432 | ||
433 | void *srd_find_callback(int output_type) | |
434 | { | |
435 | GSList *l; | |
436 | struct srd_pd_callback *pd_cb; | |
437 | void *(cb); | |
438 | ||
439 | cb = NULL; | |
440 | for (l = callbacks; l; l = l->next) { | |
441 | pd_cb = l->data; | |
442 | if (pd_cb->output_type == output_type) { | |
443 | cb = pd_cb->callback; | |
444 | break; | |
445 | } | |
446 | } | |
447 | ||
448 | return cb; | |
449 | } | |
450 |