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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2015 Aurelien Jacobs <aurel@gnuage.org> | |
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 <glib.h> | |
22 | #include <string.h> | |
23 | #include <libsigrok/libsigrok.h> | |
24 | #include "libsigrok-internal.h" | |
25 | ||
26 | #define LOG_PREFIX "modbus" | |
27 | ||
28 | SR_PRIV extern const struct sr_modbus_dev_inst modbus_serial_rtu_dev; | |
29 | ||
30 | static const struct sr_modbus_dev_inst *modbus_devs[] = { | |
31 | #ifdef HAVE_LIBSERIALPORT | |
32 | &modbus_serial_rtu_dev, /* Must be last as it matches any resource. */ | |
33 | #endif | |
34 | }; | |
35 | ||
36 | static struct sr_dev_inst *sr_modbus_scan_resource(const char *resource, | |
37 | const char *serialcomm, int modbusaddr, | |
38 | struct sr_dev_inst *(*probe_device)(struct sr_modbus_dev_inst *modbus)) | |
39 | { | |
40 | struct sr_modbus_dev_inst *modbus; | |
41 | struct sr_dev_inst *sdi; | |
42 | ||
43 | if (!(modbus = modbus_dev_inst_new(resource, serialcomm, modbusaddr))) | |
44 | return NULL; | |
45 | ||
46 | if (sr_modbus_open(modbus) != SR_OK) { | |
47 | sr_info("Couldn't open Modbus device."); | |
48 | sr_modbus_free(modbus); | |
49 | return NULL; | |
50 | }; | |
51 | ||
52 | if ((sdi = probe_device(modbus))) | |
53 | return sdi; | |
54 | ||
55 | sr_modbus_close(modbus); | |
56 | sr_modbus_free(modbus); | |
57 | ||
58 | return NULL; | |
59 | } | |
60 | ||
61 | /** | |
62 | * Scan for Modbus devices which match a probing function. | |
63 | * | |
64 | * @param drvc The driver context doing the scan. | |
65 | * @param options The scan options to find devies. | |
66 | * @param probe_device The callback function that will be called for each | |
67 | * found device to validate whether this device matches | |
68 | * what we are scanning for. | |
69 | * | |
70 | * @return A list of the devices found or NULL if no devices were found. | |
71 | */ | |
72 | SR_PRIV GSList *sr_modbus_scan(struct drv_context *drvc, GSList *options, | |
73 | struct sr_dev_inst *(*probe_device)(struct sr_modbus_dev_inst *modbus)) | |
74 | { | |
75 | GSList *resources, *l, *devices; | |
76 | struct sr_dev_inst *sdi; | |
77 | const char *resource = NULL; | |
78 | const char *serialcomm = NULL; | |
79 | int modbusaddr = 1; | |
80 | gchar **res; | |
81 | unsigned int i; | |
82 | ||
83 | for (l = options; l; l = l->next) { | |
84 | struct sr_config *src = l->data; | |
85 | switch (src->key) { | |
86 | case SR_CONF_CONN: | |
87 | resource = g_variant_get_string(src->data, NULL); | |
88 | break; | |
89 | case SR_CONF_SERIALCOMM: | |
90 | serialcomm = g_variant_get_string(src->data, NULL); | |
91 | break; | |
92 | case SR_CONF_MODBUSADDR: | |
93 | modbusaddr = g_variant_get_uint64(src->data); | |
94 | break; | |
95 | } | |
96 | } | |
97 | ||
98 | devices = NULL; | |
99 | for (i = 0; i < ARRAY_SIZE(modbus_devs); i++) { | |
100 | if ((resource && strcmp(resource, modbus_devs[i]->prefix)) | |
101 | || !modbus_devs[i]->scan) | |
102 | continue; | |
103 | resources = modbus_devs[i]->scan(modbusaddr); | |
104 | for (l = resources; l; l = l->next) { | |
105 | res = g_strsplit(l->data, ":", 2); | |
106 | if (res[0] && (sdi = sr_modbus_scan_resource(res[0], | |
107 | serialcomm ? serialcomm : res[1], | |
108 | modbusaddr, probe_device))) { | |
109 | devices = g_slist_append(devices, sdi); | |
110 | sdi->connection_id = g_strdup(l->data); | |
111 | } | |
112 | g_strfreev(res); | |
113 | } | |
114 | g_slist_free_full(resources, g_free); | |
115 | } | |
116 | ||
117 | if (!devices && resource) { | |
118 | sdi = sr_modbus_scan_resource(resource, serialcomm, modbusaddr, | |
119 | probe_device); | |
120 | if (sdi) | |
121 | devices = g_slist_append(NULL, sdi); | |
122 | } | |
123 | ||
124 | /* Tack a copy of the newly found devices onto the driver list. */ | |
125 | if (devices) | |
126 | drvc->instances = g_slist_concat(drvc->instances, g_slist_copy(devices)); | |
127 | ||
128 | return devices; | |
129 | } | |
130 | ||
131 | /** | |
132 | * Allocate and initialize a struct for a Modbus device instance. | |
133 | * | |
134 | * @param resource The resource description string. | |
135 | * @param serialcomm Additionnal parameters for serial port resources. | |
136 | * | |
137 | * @return The allocated sr_modbus_dev_inst structure or NULL on failure. | |
138 | */ | |
139 | SR_PRIV struct sr_modbus_dev_inst *modbus_dev_inst_new(const char *resource, | |
140 | const char *serialcomm, int modbusaddr) | |
141 | { | |
142 | struct sr_modbus_dev_inst *modbus = NULL; | |
143 | const struct sr_modbus_dev_inst *modbus_dev; | |
144 | gchar **params; | |
145 | unsigned int i; | |
146 | ||
147 | for (i = 0; i < ARRAY_SIZE(modbus_devs); i++) { | |
148 | modbus_dev = modbus_devs[i]; | |
149 | if (!strncmp(resource, modbus_dev->prefix, strlen(modbus_dev->prefix))) { | |
150 | sr_dbg("Opening %s device %s.", modbus_dev->name, resource); | |
151 | modbus = g_malloc(sizeof(*modbus)); | |
152 | *modbus = *modbus_dev; | |
153 | modbus->priv = g_malloc0(modbus->priv_size); | |
154 | modbus->read_timeout_ms = 1000; | |
155 | params = g_strsplit(resource, "/", 0); | |
156 | if (modbus->dev_inst_new(modbus->priv, resource, | |
157 | params, serialcomm, modbusaddr) != SR_OK) { | |
158 | sr_modbus_free(modbus); | |
159 | modbus = NULL; | |
160 | } | |
161 | g_strfreev(params); | |
162 | break; | |
163 | } | |
164 | } | |
165 | ||
166 | return modbus; | |
167 | } | |
168 | ||
169 | /** | |
170 | * Open the specified Modbus device. | |
171 | * | |
172 | * @param modbus Previously initialized Modbus device structure. | |
173 | * | |
174 | * @return SR_OK on success, SR_ERR on failure. | |
175 | */ | |
176 | SR_PRIV int sr_modbus_open(struct sr_modbus_dev_inst *modbus) | |
177 | { | |
178 | return modbus->open(modbus->priv); | |
179 | } | |
180 | ||
181 | /** | |
182 | * Add an event source for a Modbus device. | |
183 | * | |
184 | * @param session The session to add the event source to. | |
185 | * @param modbus Previously initialized Modbus device structure. | |
186 | * @param events Events to check for. | |
187 | * @param timeout Max time to wait before the callback is called, ignored if 0. | |
188 | * @param cb Callback function to add. Must not be NULL. | |
189 | * @param cb_data Data for the callback function. Can be NULL. | |
190 | * | |
191 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or | |
192 | * SR_ERR_MALLOC upon memory allocation errors. | |
193 | */ | |
194 | SR_PRIV int sr_modbus_source_add(struct sr_session *session, | |
195 | struct sr_modbus_dev_inst *modbus, int events, int timeout, | |
196 | sr_receive_data_callback cb, void *cb_data) | |
197 | { | |
198 | return modbus->source_add(session, modbus->priv, events, timeout, cb, cb_data); | |
199 | } | |
200 | ||
201 | /** | |
202 | * Remove event source for a Modbus device. | |
203 | * | |
204 | * @param session The session to remove the event source from. | |
205 | * @param modbus Previously initialized Modbus device structure. | |
206 | * | |
207 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or | |
208 | * SR_ERR_MALLOC upon memory allocation errors, SR_ERR_BUG upon | |
209 | * internal errors. | |
210 | */ | |
211 | SR_PRIV int sr_modbus_source_remove(struct sr_session *session, | |
212 | struct sr_modbus_dev_inst *modbus) | |
213 | { | |
214 | return modbus->source_remove(session, modbus->priv); | |
215 | } | |
216 | ||
217 | /** | |
218 | * Send a Modbus command. | |
219 | * | |
220 | * @param modbus Previously initialized Modbus device structure. | |
221 | * @param request Buffer containing the Modbus command to send. | |
222 | * @param request_size The size of the request buffer. | |
223 | * | |
224 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or | |
225 | * SR_ERR on failure. | |
226 | */ | |
227 | SR_PRIV int sr_modbus_request(struct sr_modbus_dev_inst *modbus, | |
228 | uint8_t *request, int request_size) | |
229 | { | |
230 | if (!request || request_size < 1) | |
231 | return SR_ERR_ARG; | |
232 | ||
233 | return modbus->send(modbus->priv, request, request_size); | |
234 | } | |
235 | ||
236 | /** | |
237 | * Receive a Modbus reply. | |
238 | * | |
239 | * @param modbus Previously initialized Modbus device structure. | |
240 | * @param reply Buffer to store the received Modbus reply. | |
241 | * @param reply_size The size of the reply buffer. | |
242 | * | |
243 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or | |
244 | * SR_ERR on failure. | |
245 | */ | |
246 | SR_PRIV int sr_modbus_reply(struct sr_modbus_dev_inst *modbus, | |
247 | uint8_t *reply, int reply_size) | |
248 | { | |
249 | int len, ret; | |
250 | gint64 laststart; | |
251 | unsigned int elapsed_ms; | |
252 | ||
253 | if (!reply || reply_size < 2) | |
254 | return SR_ERR_ARG; | |
255 | ||
256 | laststart = g_get_monotonic_time(); | |
257 | ||
258 | ret = modbus->read_begin(modbus->priv, reply); | |
259 | if (ret != SR_OK) | |
260 | return ret; | |
261 | if (*reply & 0x80) | |
262 | reply_size = 2; | |
263 | ||
264 | reply++; | |
265 | reply_size--; | |
266 | ||
267 | while (reply_size > 0) { | |
268 | len = modbus->read_data(modbus->priv, reply, reply_size); | |
269 | if (len < 0) { | |
270 | sr_err("Incompletely read Modbus response."); | |
271 | return SR_ERR; | |
272 | } else if (len > 0) { | |
273 | laststart = g_get_monotonic_time(); | |
274 | } | |
275 | reply += len; | |
276 | reply_size -= len; | |
277 | elapsed_ms = (g_get_monotonic_time() - laststart) / 1000; | |
278 | if (elapsed_ms >= modbus->read_timeout_ms) { | |
279 | sr_err("Timed out waiting for Modbus response."); | |
280 | return SR_ERR; | |
281 | } | |
282 | } | |
283 | ||
284 | ret = modbus->read_end(modbus->priv); | |
285 | if (ret != SR_OK) | |
286 | return ret; | |
287 | ||
288 | return SR_OK; | |
289 | } | |
290 | ||
291 | /** | |
292 | * Send a Modbus command and receive the corresponding reply. | |
293 | * | |
294 | * @param modbus Previously initialized Modbus device structure. | |
295 | * @param request Buffer containing the Modbus command to send. | |
296 | * @param request_size The size of the request buffer. | |
297 | * @param reply Buffer to store the received Modbus reply. | |
298 | * @param reply_size The size of the reply buffer. | |
299 | * | |
300 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or | |
301 | * SR_ERR on failure. | |
302 | */ | |
303 | SR_PRIV int sr_modbus_request_reply(struct sr_modbus_dev_inst *modbus, | |
304 | uint8_t *request, int request_size, uint8_t *reply, int reply_size) | |
305 | { | |
306 | int ret; | |
307 | ret = sr_modbus_request(modbus, request, request_size); | |
308 | if (ret != SR_OK) | |
309 | return ret; | |
310 | return sr_modbus_reply(modbus, reply, reply_size); | |
311 | } | |
312 | ||
313 | enum { | |
314 | MODBUS_READ_COILS = 0x01, | |
315 | MODBUS_READ_HOLDING_REGISTERS = 0x03, | |
316 | MODBUS_WRITE_COIL = 0x05, | |
317 | MODBUS_WRITE_MULTIPLE_REGISTERS = 0x10, | |
318 | }; | |
319 | ||
320 | static int sr_modbus_error_check(const uint8_t *reply) | |
321 | { | |
322 | const char *function = "UNKNOWN"; | |
323 | const char *error = NULL; | |
324 | char buf[8]; | |
325 | ||
326 | if (!(reply[0] & 0x80)) | |
327 | return FALSE; | |
328 | ||
329 | switch (reply[0] & ~0x80) { | |
330 | case MODBUS_READ_COILS: | |
331 | function = "MODBUS_READ_COILS"; | |
332 | break; | |
333 | case MODBUS_READ_HOLDING_REGISTERS: | |
334 | function = "READ_HOLDING_REGISTERS"; | |
335 | break; | |
336 | case MODBUS_WRITE_COIL: | |
337 | function = "WRITE_COIL"; | |
338 | break; | |
339 | case MODBUS_WRITE_MULTIPLE_REGISTERS: | |
340 | function = "WRITE_MULTIPLE_REGISTERS"; | |
341 | break; | |
342 | } | |
343 | ||
344 | switch (reply[1]) { | |
345 | case 0x01: | |
346 | error = "ILLEGAL FUNCTION"; | |
347 | break; | |
348 | case 0x02: | |
349 | error = "ILLEGAL DATA ADDRESS"; | |
350 | break; | |
351 | case 0x03: | |
352 | error = "ILLEGAL DATA VALUE"; | |
353 | break; | |
354 | case 0x04: | |
355 | error = "SLAVE DEVICE FAILURE"; | |
356 | break; | |
357 | case 0x05: | |
358 | error = "ACKNOWLEDGE"; | |
359 | break; | |
360 | case 0x06: | |
361 | error = "SLAVE DEVICE BUSY"; | |
362 | break; | |
363 | case 0x08: | |
364 | error = "MEMORY PARITY ERROR"; | |
365 | break; | |
366 | case 0x0A: | |
367 | error = "GATEWAY PATH UNAVAILABLE"; | |
368 | break; | |
369 | case 0x0B: | |
370 | error = "GATEWAY TARGET DEVICE FAILED TO RESPOND"; | |
371 | break; | |
372 | } | |
373 | if (!error) { | |
374 | snprintf(buf, sizeof(buf), "0x%X", reply[1]); | |
375 | error = buf; | |
376 | } | |
377 | ||
378 | sr_err("%s error executing %s function.", error, function); | |
379 | ||
380 | return TRUE; | |
381 | } | |
382 | ||
383 | /** | |
384 | * Send a Modbus read coils command and receive the corresponding coils values. | |
385 | * | |
386 | * @param modbus Previously initialized Modbus device structure. | |
387 | * @param address The Modbus address of the first coil to read, or -1 to read | |
388 | * the reply of a previouly sent read coils command. | |
389 | * @param nb_coils The number of coils to read. | |
390 | * @param coils Buffer to store all the received coils values (1 bit per coil), | |
391 | * or NULL to send the read coil command without reading the reply. | |
392 | * | |
393 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, | |
394 | * SR_ERR_DATA upon invalid data, or SR_ERR on failure. | |
395 | */ | |
396 | SR_PRIV int sr_modbus_read_coils(struct sr_modbus_dev_inst *modbus, | |
397 | int address, int nb_coils, uint8_t *coils) | |
398 | { | |
399 | uint8_t request[5], reply[2 + (nb_coils + 7) / 8]; | |
400 | int ret; | |
401 | ||
402 | if (address < -1 || address > 0xFFFF || nb_coils < 1 || nb_coils > 2000) | |
403 | return SR_ERR_ARG; | |
404 | ||
405 | W8(request + 0, MODBUS_READ_COILS); | |
406 | WB16(request + 1, address); | |
407 | WB16(request + 3, nb_coils); | |
408 | ||
409 | if (address >= 0) { | |
410 | ret = sr_modbus_request(modbus, request, sizeof(request)); | |
411 | if (ret != SR_OK) | |
412 | return ret; | |
413 | } | |
414 | ||
415 | if (coils) { | |
416 | ret = sr_modbus_reply(modbus, reply, sizeof(reply)); | |
417 | if (ret != SR_OK) | |
418 | return ret; | |
419 | if (sr_modbus_error_check(reply)) | |
420 | return SR_ERR_DATA; | |
421 | if (reply[0] != request[0] || R8(reply + 1) != (uint8_t)((nb_coils + 7) / 8)) | |
422 | return SR_ERR_DATA; | |
423 | memcpy(coils, reply + 2, (nb_coils + 7) / 8); | |
424 | } | |
425 | ||
426 | return SR_OK; | |
427 | } | |
428 | ||
429 | /** | |
430 | * Send a Modbus read holding registers command and receive the corresponding | |
431 | * registers values. | |
432 | * | |
433 | * @param modbus Previously initialized Modbus device structure. | |
434 | * @param address The Modbus address of the first register to read, or -1 to | |
435 | * read the reply of a previouly sent read registers command. | |
436 | * @param nb_registers The number of registers to read. | |
437 | * @param registers Buffer to store all the received registers values, | |
438 | * or NULL to send the read holding registers command | |
439 | * without reading the reply. | |
440 | * | |
441 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, | |
442 | * SR_ERR_DATA upon invalid data, or SR_ERR on failure. | |
443 | */ | |
444 | SR_PRIV int sr_modbus_read_holding_registers(struct sr_modbus_dev_inst *modbus, | |
445 | int address, int nb_registers, uint16_t *registers) | |
446 | { | |
447 | uint8_t request[5], reply[2 + (2 * nb_registers)]; | |
448 | int ret; | |
449 | ||
450 | if (address < -1 || address > 0xFFFF | |
451 | || nb_registers < 1 || nb_registers > 125) | |
452 | return SR_ERR_ARG; | |
453 | ||
454 | W8(request + 0, MODBUS_READ_HOLDING_REGISTERS); | |
455 | WB16(request + 1, address); | |
456 | WB16(request + 3, nb_registers); | |
457 | ||
458 | if (address >= 0) { | |
459 | ret = sr_modbus_request(modbus, request, sizeof(request)); | |
460 | if (ret != SR_OK) | |
461 | return ret; | |
462 | } | |
463 | ||
464 | if (registers) { | |
465 | ret = sr_modbus_reply(modbus, reply, sizeof(reply)); | |
466 | if (ret != SR_OK) | |
467 | return ret; | |
468 | if (sr_modbus_error_check(reply)) | |
469 | return SR_ERR_DATA; | |
470 | if (reply[0] != request[0] || R8(reply + 1) != (uint8_t)(2 * nb_registers)) | |
471 | return SR_ERR_DATA; | |
472 | memcpy(registers, reply + 2, 2 * nb_registers); | |
473 | } | |
474 | ||
475 | return SR_OK; | |
476 | } | |
477 | ||
478 | /** | |
479 | * Send a Modbus write coil command. | |
480 | * | |
481 | * @param modbus Previously initialized Modbus device structure. | |
482 | * @param address The Modbus address of the coil to write. | |
483 | * @param value The new value to assign to this coil. | |
484 | * | |
485 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, | |
486 | * SR_ERR_DATA upon invalid data, or SR_ERR on failure. | |
487 | */ | |
488 | SR_PRIV int sr_modbus_write_coil(struct sr_modbus_dev_inst *modbus, | |
489 | int address, int value) | |
490 | { | |
491 | uint8_t request[5], reply[5]; | |
492 | int ret; | |
493 | ||
494 | if (address < 0 || address > 0xFFFF) | |
495 | return SR_ERR_ARG; | |
496 | ||
497 | W8(request + 0, MODBUS_WRITE_COIL); | |
498 | WB16(request + 1, address); | |
499 | WB16(request + 3, value ? 0xFF00 : 0); | |
500 | ||
501 | ret = sr_modbus_request_reply(modbus, request, sizeof(request), | |
502 | reply, sizeof(reply)); | |
503 | if (ret != SR_OK) | |
504 | return ret; | |
505 | if (sr_modbus_error_check(reply)) | |
506 | return SR_ERR_DATA; | |
507 | if (memcmp(request, reply, sizeof(reply))) | |
508 | return SR_ERR_DATA; | |
509 | ||
510 | return SR_OK; | |
511 | } | |
512 | ||
513 | /** | |
514 | * Send a Modbus write multiple registers command. | |
515 | * | |
516 | * @param modbus Previously initialized Modbus device structure. | |
517 | * @param address The Modbus address of the first register to write. | |
518 | * @param nb_registers The number of registers to write. | |
519 | * @param registers Buffer holding all the registers values to write. | |
520 | * | |
521 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, | |
522 | * SR_ERR_DATA upon invalid data, or SR_ERR on failure. | |
523 | */ | |
524 | SR_PRIV int sr_modbus_write_multiple_registers(struct sr_modbus_dev_inst*modbus, | |
525 | int address, int nb_registers, uint16_t *registers) | |
526 | { | |
527 | uint8_t request[6 + (2 * nb_registers)], reply[5]; | |
528 | int ret; | |
529 | ||
530 | if (address < 0 || address > 0xFFFF | |
531 | || nb_registers < 1 || nb_registers > 123 || !registers) | |
532 | return SR_ERR_ARG; | |
533 | ||
534 | W8(request + 0, MODBUS_WRITE_MULTIPLE_REGISTERS); | |
535 | WB16(request + 1, address); | |
536 | WB16(request + 3, nb_registers); | |
537 | W8(request + 5, 2 * nb_registers); | |
538 | memcpy(request + 6, registers, 2 * nb_registers); | |
539 | ||
540 | ret = sr_modbus_request_reply(modbus, request, sizeof(request), | |
541 | reply, sizeof(reply)); | |
542 | if (ret != SR_OK) | |
543 | return ret; | |
544 | if (sr_modbus_error_check(reply)) | |
545 | return SR_ERR_DATA; | |
546 | if (memcmp(request, reply, sizeof(reply))) | |
547 | return SR_ERR_DATA; | |
548 | ||
549 | return SR_OK; | |
550 | } | |
551 | ||
552 | /** | |
553 | * Close Modbus device. | |
554 | * | |
555 | * @param modbus Previously initialized Modbus device structure. | |
556 | * | |
557 | * @return SR_OK on success, SR_ERR on failure. | |
558 | */ | |
559 | SR_PRIV int sr_modbus_close(struct sr_modbus_dev_inst *modbus) | |
560 | { | |
561 | return modbus->close(modbus->priv); | |
562 | } | |
563 | ||
564 | /** | |
565 | * Free Modbus device. | |
566 | * | |
567 | * @param modbus Previously initialized Modbus device structure. | |
568 | * | |
569 | * @return SR_OK on success, SR_ERR on failure. | |
570 | */ | |
571 | SR_PRIV void sr_modbus_free(struct sr_modbus_dev_inst *modbus) | |
572 | { | |
573 | modbus->free(modbus->priv); | |
574 | g_free(modbus->priv); | |
575 | g_free(modbus); | |
576 | } |