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1 | /* | |
2 | * This file is part of the libserialport project. | |
3 | * | |
4 | * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com> | |
5 | * Copyright (C) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de> | |
6 | * Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li> | |
7 | * | |
8 | * This program is free software: you can redistribute it and/or modify | |
9 | * it under the terms of the GNU Lesser General Public License as | |
10 | * published by the Free Software Foundation, either version 3 of the | |
11 | * License, or (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public License | |
19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
22 | #include <string.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
25 | #include <fcntl.h> | |
26 | #include <unistd.h> | |
27 | #include <stdlib.h> | |
28 | #include <errno.h> | |
29 | #ifdef _WIN32 | |
30 | #include <windows.h> | |
31 | #include <tchar.h> | |
32 | #include <stdio.h> | |
33 | #else | |
34 | #include <termios.h> | |
35 | #include <sys/ioctl.h> | |
36 | #endif | |
37 | #ifdef __APPLE__ | |
38 | #include <IOKit/IOKitLib.h> | |
39 | #include <IOKit/serial/IOSerialKeys.h> | |
40 | #include <sys/syslimits.h> | |
41 | #endif | |
42 | #ifdef __linux__ | |
43 | #include "libudev.h" | |
44 | #include "linux/serial.h" | |
45 | #endif | |
46 | ||
47 | #include "libserialport.h" | |
48 | ||
49 | struct port_data { | |
50 | #ifdef _WIN32 | |
51 | DCB dcb; | |
52 | #else | |
53 | struct termios term; | |
54 | int controlbits; | |
55 | #endif | |
56 | }; | |
57 | ||
58 | /* Standard baud rates. */ | |
59 | #ifdef _WIN32 | |
60 | #define BAUD_TYPE DWORD | |
61 | #define BAUD(n) {CBR_##n, n} | |
62 | #else | |
63 | #define BAUD_TYPE speed_t | |
64 | #define BAUD(n) {B##n, n} | |
65 | #endif | |
66 | ||
67 | struct std_baudrate { | |
68 | BAUD_TYPE index; | |
69 | int value; | |
70 | }; | |
71 | ||
72 | const struct std_baudrate std_baudrates[] = { | |
73 | #ifdef _WIN32 | |
74 | /* | |
75 | * The baudrates 50/75/134/150/200/1800/230400/460800 do not seem to | |
76 | * have documented CBR_* macros. | |
77 | */ | |
78 | BAUD(110), BAUD(300), BAUD(600), BAUD(1200), BAUD(2400), BAUD(4800), | |
79 | BAUD(9600), BAUD(14400), BAUD(19200), BAUD(38400), BAUD(57600), | |
80 | BAUD(115200), BAUD(128000), BAUD(256000) | |
81 | #else | |
82 | BAUD(50), BAUD(75), BAUD(110), BAUD(134), BAUD(150), BAUD(200), BAUD(300), | |
83 | BAUD(600), BAUD(1200), BAUD(1800), BAUD(2400), BAUD(4800), BAUD(9600), | |
84 | BAUD(19200), BAUD(38400), BAUD(57600), BAUD(115200), BAUD(230400), | |
85 | #if !defined(__APPLE__) && !defined(__OpenBSD__) | |
86 | BAUD(460800) | |
87 | #endif | |
88 | #endif | |
89 | }; | |
90 | ||
91 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0])) | |
92 | #define NUM_STD_BAUDRATES ARRAY_SIZE(std_baudrates) | |
93 | ||
94 | /* Helper functions. */ | |
95 | static int validate_port(struct sp_port *port); | |
96 | static struct sp_port **list_append(struct sp_port **list, const char *portname); | |
97 | static int get_config(struct sp_port *port, struct port_data *data, struct sp_port_config *config); | |
98 | static int set_config(struct sp_port *port, struct port_data *data, const struct sp_port_config *config); | |
99 | ||
100 | int sp_get_port_by_name(const char *portname, struct sp_port **port_ptr) | |
101 | { | |
102 | struct sp_port *port; | |
103 | int len; | |
104 | ||
105 | if (!port_ptr) | |
106 | return SP_ERR_ARG; | |
107 | ||
108 | *port_ptr = NULL; | |
109 | ||
110 | if (!portname) | |
111 | return SP_ERR_ARG; | |
112 | ||
113 | if (!(port = malloc(sizeof(struct sp_port)))) | |
114 | return SP_ERR_MEM; | |
115 | ||
116 | len = strlen(portname) + 1; | |
117 | ||
118 | if (!(port->name = malloc(len))) | |
119 | { | |
120 | free(port); | |
121 | return SP_ERR_MEM; | |
122 | } | |
123 | ||
124 | memcpy(port->name, portname, len); | |
125 | ||
126 | #ifdef _WIN32 | |
127 | port->hdl = INVALID_HANDLE_VALUE; | |
128 | #else | |
129 | port->fd = -1; | |
130 | #endif | |
131 | ||
132 | *port_ptr = port; | |
133 | ||
134 | return SP_OK; | |
135 | } | |
136 | ||
137 | int sp_copy_port(const struct sp_port *port, struct sp_port **copy_ptr) | |
138 | { | |
139 | if (!copy_ptr) | |
140 | return SP_ERR_ARG; | |
141 | ||
142 | *copy_ptr = NULL; | |
143 | ||
144 | if (!port || !port->name) | |
145 | return SP_ERR_ARG; | |
146 | ||
147 | return sp_get_port_by_name(port->name, copy_ptr); | |
148 | } | |
149 | ||
150 | void sp_free_port(struct sp_port *port) | |
151 | { | |
152 | if (!port) | |
153 | return; | |
154 | ||
155 | if (port->name) | |
156 | free(port->name); | |
157 | ||
158 | free(port); | |
159 | } | |
160 | ||
161 | static struct sp_port **list_append(struct sp_port **list, const char *portname) | |
162 | { | |
163 | void *tmp; | |
164 | unsigned int count; | |
165 | ||
166 | for (count = 0; list[count]; count++); | |
167 | if (!(tmp = realloc(list, sizeof(struct sp_port *) * (count + 2)))) | |
168 | goto fail; | |
169 | list = tmp; | |
170 | if (sp_get_port_by_name(portname, &list[count]) != SP_OK) | |
171 | goto fail; | |
172 | list[count + 1] = NULL; | |
173 | return list; | |
174 | ||
175 | fail: | |
176 | sp_free_port_list(list); | |
177 | return NULL; | |
178 | } | |
179 | ||
180 | int sp_list_ports(struct sp_port ***list_ptr) | |
181 | { | |
182 | struct sp_port **list; | |
183 | int ret = SP_OK; | |
184 | ||
185 | if (!(list = malloc(sizeof(struct sp_port **)))) | |
186 | return SP_ERR_MEM; | |
187 | ||
188 | list[0] = NULL; | |
189 | ||
190 | #ifdef _WIN32 | |
191 | HKEY key; | |
192 | TCHAR *value, *data; | |
193 | DWORD max_value_len, max_data_size, max_data_len; | |
194 | DWORD value_len, data_size, data_len; | |
195 | DWORD type, index = 0; | |
196 | char *name; | |
197 | int name_len; | |
198 | ||
199 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("HARDWARE\\DEVICEMAP\\SERIALCOMM"), | |
200 | 0, KEY_QUERY_VALUE, &key) != ERROR_SUCCESS) | |
201 | { | |
202 | ret = SP_ERR_FAIL; | |
203 | goto out_done; | |
204 | } | |
205 | if (RegQueryInfoKey(key, NULL, NULL, NULL, NULL, NULL, NULL, NULL, | |
206 | &max_value_len, &max_data_size, NULL, NULL) != ERROR_SUCCESS) | |
207 | { | |
208 | ret = SP_ERR_FAIL; | |
209 | goto out_close; | |
210 | } | |
211 | max_data_len = max_data_size / sizeof(TCHAR); | |
212 | if (!(value = malloc((max_value_len + 1) * sizeof(TCHAR)))) | |
213 | { | |
214 | ret = SP_ERR_MEM; | |
215 | goto out_close; | |
216 | } | |
217 | if (!(data = malloc((max_data_len + 1) * sizeof(TCHAR)))) | |
218 | { | |
219 | ret = SP_ERR_MEM; | |
220 | goto out_free_value; | |
221 | } | |
222 | while ( | |
223 | value_len = max_value_len + 1, | |
224 | data_size = max_data_size, | |
225 | RegEnumValue(key, index, value, &value_len, | |
226 | NULL, &type, (LPBYTE)data, &data_size) == ERROR_SUCCESS) | |
227 | { | |
228 | data_len = data_size / sizeof(TCHAR); | |
229 | data[data_len] = '\0'; | |
230 | #ifdef UNICODE | |
231 | name_len = WideCharToMultiByte(CP_ACP, 0, data, -1, NULL, 0, NULL, NULL) | |
232 | #else | |
233 | name_len = data_len + 1; | |
234 | #endif | |
235 | if (!(name = malloc(name_len))) | |
236 | { | |
237 | ret = SP_ERR_MEM; | |
238 | goto out; | |
239 | } | |
240 | #ifdef UNICODE | |
241 | WideCharToMultiByte(CP_ACP, 0, data, -1, name, name_len, NULL, NULL); | |
242 | #else | |
243 | strcpy(name, data); | |
244 | #endif | |
245 | if (type == REG_SZ && !(list = list_append(list, name))) | |
246 | { | |
247 | ret = SP_ERR_MEM; | |
248 | goto out; | |
249 | } | |
250 | index++; | |
251 | } | |
252 | out: | |
253 | free(data); | |
254 | out_free_value: | |
255 | free(value); | |
256 | out_close: | |
257 | RegCloseKey(key); | |
258 | out_done: | |
259 | #endif | |
260 | #ifdef __APPLE__ | |
261 | mach_port_t master; | |
262 | CFMutableDictionaryRef classes; | |
263 | io_iterator_t iter; | |
264 | char *path; | |
265 | io_object_t port; | |
266 | CFTypeRef cf_path; | |
267 | Boolean result; | |
268 | ||
269 | if (IOMasterPort(MACH_PORT_NULL, &master) != KERN_SUCCESS) | |
270 | { | |
271 | ret = SP_ERR_FAIL; | |
272 | goto out_done; | |
273 | } | |
274 | ||
275 | if (!(classes = IOServiceMatching(kIOSerialBSDServiceValue))) | |
276 | { | |
277 | ret = SP_ERR_FAIL; | |
278 | goto out_done; | |
279 | } | |
280 | ||
281 | CFDictionarySetValue(classes, | |
282 | CFSTR(kIOSerialBSDTypeKey), CFSTR(kIOSerialBSDAllTypes)); | |
283 | ||
284 | if (IOServiceGetMatchingServices(master, classes, &iter) != KERN_SUCCESS) | |
285 | { | |
286 | ret = SP_ERR_FAIL; | |
287 | goto out_done; | |
288 | } | |
289 | ||
290 | if (!(path = malloc(PATH_MAX))) | |
291 | { | |
292 | ret = SP_ERR_MEM; | |
293 | goto out_release; | |
294 | } | |
295 | ||
296 | while ((port = IOIteratorNext(iter))) { | |
297 | cf_path = IORegistryEntryCreateCFProperty(port, | |
298 | CFSTR(kIOCalloutDeviceKey), kCFAllocatorDefault, 0); | |
299 | if (cf_path) { | |
300 | result = CFStringGetCString(cf_path, | |
301 | path, PATH_MAX, kCFStringEncodingASCII); | |
302 | CFRelease(cf_path); | |
303 | if (result && !(list = list_append(list, path))) | |
304 | { | |
305 | ret = SP_ERR_MEM; | |
306 | IOObjectRelease(port); | |
307 | goto out; | |
308 | } | |
309 | } | |
310 | IOObjectRelease(port); | |
311 | } | |
312 | out: | |
313 | free(path); | |
314 | out_release: | |
315 | IOObjectRelease(iter); | |
316 | out_done: | |
317 | #endif | |
318 | #ifdef __linux__ | |
319 | struct udev *ud; | |
320 | struct udev_enumerate *ud_enumerate; | |
321 | struct udev_list_entry *ud_list; | |
322 | struct udev_list_entry *ud_entry; | |
323 | const char *path; | |
324 | struct udev_device *ud_dev, *ud_parent; | |
325 | const char *name; | |
326 | const char *driver; | |
327 | int fd, ioctl_result; | |
328 | struct serial_struct serial_info; | |
329 | ||
330 | ud = udev_new(); | |
331 | ud_enumerate = udev_enumerate_new(ud); | |
332 | udev_enumerate_add_match_subsystem(ud_enumerate, "tty"); | |
333 | udev_enumerate_scan_devices(ud_enumerate); | |
334 | ud_list = udev_enumerate_get_list_entry(ud_enumerate); | |
335 | udev_list_entry_foreach(ud_entry, ud_list) | |
336 | { | |
337 | path = udev_list_entry_get_name(ud_entry); | |
338 | ud_dev = udev_device_new_from_syspath(ud, path); | |
339 | /* If there is no parent device, this is a virtual tty. */ | |
340 | ud_parent = udev_device_get_parent(ud_dev); | |
341 | if (ud_parent == NULL) | |
342 | { | |
343 | udev_device_unref(ud_dev); | |
344 | continue; | |
345 | } | |
346 | name = udev_device_get_devnode(ud_dev); | |
347 | /* The serial8250 driver has a hardcoded number of ports. | |
348 | * The only way to tell which actually exist on a given system | |
349 | * is to try to open them and make an ioctl call. */ | |
350 | driver = udev_device_get_driver(ud_parent); | |
351 | if (driver && !strcmp(driver, "serial8250")) | |
352 | { | |
353 | if ((fd = open(name, O_RDWR | O_NONBLOCK | O_NOCTTY)) < 0) | |
354 | goto skip; | |
355 | ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info); | |
356 | close(fd); | |
357 | if (ioctl_result != 0) | |
358 | goto skip; | |
359 | if (serial_info.type == PORT_UNKNOWN) | |
360 | goto skip; | |
361 | } | |
362 | list = list_append(list, name); | |
363 | skip: | |
364 | udev_device_unref(ud_dev); | |
365 | if (!list) | |
366 | { | |
367 | ret = SP_ERR_MEM; | |
368 | goto out; | |
369 | } | |
370 | } | |
371 | out: | |
372 | udev_enumerate_unref(ud_enumerate); | |
373 | udev_unref(ud); | |
374 | #endif | |
375 | ||
376 | if (ret == SP_OK) | |
377 | { | |
378 | *list_ptr = list; | |
379 | } | |
380 | else | |
381 | { | |
382 | if (list) | |
383 | sp_free_port_list(list); | |
384 | ||
385 | *list_ptr = NULL; | |
386 | } | |
387 | ||
388 | return ret; | |
389 | } | |
390 | ||
391 | void sp_free_port_list(struct sp_port **list) | |
392 | { | |
393 | unsigned int i; | |
394 | ||
395 | for (i = 0; list[i]; i++) | |
396 | sp_free_port(list[i]); | |
397 | free(list); | |
398 | } | |
399 | ||
400 | static int validate_port(struct sp_port *port) | |
401 | { | |
402 | if (port == NULL) | |
403 | return 0; | |
404 | #ifdef _WIN32 | |
405 | if (port->hdl == INVALID_HANDLE_VALUE) | |
406 | return 0; | |
407 | #else | |
408 | if (port->fd < 0) | |
409 | return 0; | |
410 | #endif | |
411 | return 1; | |
412 | } | |
413 | ||
414 | #define CHECK_PORT() do { if (!validate_port(port)) return SP_ERR_ARG; } while (0) | |
415 | ||
416 | int sp_open(struct sp_port *port, int flags) | |
417 | { | |
418 | if (!port) | |
419 | return SP_ERR_ARG; | |
420 | ||
421 | #ifdef _WIN32 | |
422 | DWORD desired_access = 0, flags_and_attributes = 0; | |
423 | char *escaped_port_name; | |
424 | ||
425 | /* Prefix port name with '\\.\' to work with ports above COM9. */ | |
426 | if (!(escaped_port_name = malloc(strlen(port->name + 5)))) | |
427 | return SP_ERR_MEM; | |
428 | sprintf(escaped_port_name, "\\\\.\\%s", port->name); | |
429 | ||
430 | /* Map 'flags' to the OS-specific settings. */ | |
431 | desired_access |= GENERIC_READ; | |
432 | flags_and_attributes = FILE_ATTRIBUTE_NORMAL; | |
433 | if (flags & SP_MODE_RDWR) | |
434 | desired_access |= GENERIC_WRITE; | |
435 | if (flags & SP_MODE_NONBLOCK) | |
436 | flags_and_attributes |= FILE_FLAG_OVERLAPPED; | |
437 | ||
438 | port->hdl = CreateFile(escaped_port_name, desired_access, 0, 0, | |
439 | OPEN_EXISTING, flags_and_attributes, 0); | |
440 | ||
441 | free(escaped_port_name); | |
442 | ||
443 | if (port->hdl == INVALID_HANDLE_VALUE) | |
444 | return SP_ERR_FAIL; | |
445 | #else | |
446 | int flags_local = 0; | |
447 | struct port_data data; | |
448 | struct sp_port_config config; | |
449 | int ret; | |
450 | ||
451 | /* Map 'flags' to the OS-specific settings. */ | |
452 | if (flags & SP_MODE_RDWR) | |
453 | flags_local |= O_RDWR; | |
454 | if (flags & SP_MODE_RDONLY) | |
455 | flags_local |= O_RDONLY; | |
456 | if (flags & SP_MODE_NONBLOCK) | |
457 | flags_local |= O_NONBLOCK; | |
458 | ||
459 | if ((port->fd = open(port->name, flags_local)) < 0) | |
460 | return SP_ERR_FAIL; | |
461 | ||
462 | ret = get_config(port, &data, &config); | |
463 | ||
464 | if (ret < 0) | |
465 | { | |
466 | sp_close(port); | |
467 | return ret; | |
468 | } | |
469 | ||
470 | /* Turn off all serial port cooking. */ | |
471 | data.term.c_iflag &= ~(ISTRIP | INLCR | ICRNL); | |
472 | data.term.c_oflag &= ~(ONLCR | OCRNL | ONOCR); | |
473 | #if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__) | |
474 | data.term.c_oflag &= ~OFILL; | |
475 | #endif | |
476 | /* Disable canonical mode, and don't echo input characters. */ | |
477 | data.term.c_lflag &= ~(ICANON | ECHO); | |
478 | ||
479 | /* Ignore modem status lines; enable receiver */ | |
480 | data.term.c_cflag |= (CLOCAL | CREAD); | |
481 | ||
482 | ret = set_config(port, &data, &config); | |
483 | ||
484 | if (ret < 0) | |
485 | { | |
486 | sp_close(port); | |
487 | return ret; | |
488 | } | |
489 | #endif | |
490 | ||
491 | return SP_OK; | |
492 | } | |
493 | ||
494 | int sp_close(struct sp_port *port) | |
495 | { | |
496 | CHECK_PORT(); | |
497 | ||
498 | #ifdef _WIN32 | |
499 | /* Returns non-zero upon success, 0 upon failure. */ | |
500 | if (CloseHandle(port->hdl) == 0) | |
501 | return SP_ERR_FAIL; | |
502 | port->hdl = INVALID_HANDLE_VALUE; | |
503 | #else | |
504 | /* Returns 0 upon success, -1 upon failure. */ | |
505 | if (close(port->fd) == -1) | |
506 | return SP_ERR_FAIL; | |
507 | port->fd = -1; | |
508 | #endif | |
509 | ||
510 | return SP_OK; | |
511 | } | |
512 | ||
513 | int sp_flush(struct sp_port *port) | |
514 | { | |
515 | CHECK_PORT(); | |
516 | ||
517 | #ifdef _WIN32 | |
518 | /* Returns non-zero upon success, 0 upon failure. */ | |
519 | if (PurgeComm(port->hdl, PURGE_RXCLEAR | PURGE_TXCLEAR) == 0) | |
520 | return SP_ERR_FAIL; | |
521 | #else | |
522 | /* Returns 0 upon success, -1 upon failure. */ | |
523 | if (tcflush(port->fd, TCIOFLUSH) < 0) | |
524 | return SP_ERR_FAIL; | |
525 | #endif | |
526 | return SP_OK; | |
527 | } | |
528 | ||
529 | int sp_write(struct sp_port *port, const void *buf, size_t count) | |
530 | { | |
531 | CHECK_PORT(); | |
532 | ||
533 | if (!buf) | |
534 | return SP_ERR_ARG; | |
535 | ||
536 | #ifdef _WIN32 | |
537 | DWORD written = 0; | |
538 | ||
539 | /* Returns non-zero upon success, 0 upon failure. */ | |
540 | if (WriteFile(port->hdl, buf, count, &written, NULL) == 0) | |
541 | return SP_ERR_FAIL; | |
542 | return written; | |
543 | #else | |
544 | /* Returns the number of bytes written, or -1 upon failure. */ | |
545 | ssize_t written = write(port->fd, buf, count); | |
546 | ||
547 | if (written < 0) | |
548 | return SP_ERR_FAIL; | |
549 | else | |
550 | return written; | |
551 | #endif | |
552 | } | |
553 | ||
554 | int sp_read(struct sp_port *port, void *buf, size_t count) | |
555 | { | |
556 | CHECK_PORT(); | |
557 | ||
558 | if (!buf) | |
559 | return SP_ERR_ARG; | |
560 | ||
561 | #ifdef _WIN32 | |
562 | DWORD bytes_read = 0; | |
563 | ||
564 | /* Returns non-zero upon success, 0 upon failure. */ | |
565 | if (ReadFile(port->hdl, buf, count, &bytes_read, NULL) == 0) | |
566 | return SP_ERR_FAIL; | |
567 | return bytes_read; | |
568 | #else | |
569 | ssize_t bytes_read; | |
570 | ||
571 | /* Returns the number of bytes read, or -1 upon failure. */ | |
572 | if ((bytes_read = read(port->fd, buf, count)) < 0) | |
573 | return SP_ERR_FAIL; | |
574 | return bytes_read; | |
575 | #endif | |
576 | } | |
577 | ||
578 | static int get_config(struct sp_port *port, struct port_data *data, struct sp_port_config *config) | |
579 | { | |
580 | unsigned int i; | |
581 | ||
582 | #ifdef _WIN32 | |
583 | if (!GetCommState(port->hdl, &data->dcb)) | |
584 | return SP_ERR_FAIL; | |
585 | ||
586 | for (i = 0; i < NUM_STD_BAUDRATES; i++) { | |
587 | if (data->dcb.BaudRate == std_baudrates[i].index) { | |
588 | config->baudrate = std_baudrates[i].value; | |
589 | break; | |
590 | } | |
591 | } | |
592 | ||
593 | if (i == NUM_STD_BAUDRATES) | |
594 | /* BaudRate field can be either an index or a custom baud rate. */ | |
595 | config->baudrate = data->dcb.BaudRate; | |
596 | ||
597 | config->bits = data->dcb.ByteSize; | |
598 | ||
599 | if (data->dcb.fParity) | |
600 | switch (data->dcb.Parity) { | |
601 | case NOPARITY: | |
602 | config->parity = SP_PARITY_NONE; | |
603 | break; | |
604 | case EVENPARITY: | |
605 | config->parity = SP_PARITY_EVEN; | |
606 | break; | |
607 | case ODDPARITY: | |
608 | config->parity = SP_PARITY_ODD; | |
609 | break; | |
610 | default: | |
611 | config->parity = -1; | |
612 | } | |
613 | else | |
614 | config->parity = SP_PARITY_NONE; | |
615 | ||
616 | switch (data->dcb.StopBits) { | |
617 | case ONESTOPBIT: | |
618 | config->stopbits = 1; | |
619 | break; | |
620 | case TWOSTOPBITS: | |
621 | config->stopbits = 2; | |
622 | break; | |
623 | default: | |
624 | config->stopbits = -1; | |
625 | } | |
626 | ||
627 | switch (data->dcb.fRtsControl) { | |
628 | case RTS_CONTROL_DISABLE: | |
629 | config->rts = SP_RTS_OFF; | |
630 | break; | |
631 | case RTS_CONTROL_ENABLE: | |
632 | config->rts = SP_RTS_ON; | |
633 | break; | |
634 | case RTS_CONTROL_HANDSHAKE: | |
635 | config->rts = SP_RTS_FLOW_CONTROL; | |
636 | break; | |
637 | default: | |
638 | config->rts = -1; | |
639 | } | |
640 | ||
641 | config->cts = data->dcb.fOutxCtsFlow ? SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE; | |
642 | ||
643 | switch (data->dcb.fDtrControl) { | |
644 | case DTR_CONTROL_DISABLE: | |
645 | config->dtr = SP_DTR_OFF; | |
646 | break; | |
647 | case DTR_CONTROL_ENABLE: | |
648 | config->dtr = SP_DTR_ON; | |
649 | break; | |
650 | case DTR_CONTROL_HANDSHAKE: | |
651 | config->dtr = SP_DTR_FLOW_CONTROL; | |
652 | break; | |
653 | default: | |
654 | config->dtr = -1; | |
655 | } | |
656 | ||
657 | config->dsr = data->dcb.fOutxDsrFlow ? SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE; | |
658 | ||
659 | if (data->dcb.fInX) { | |
660 | if (data->dcb.fOutX) | |
661 | config->xon_xoff = SP_XONXOFF_INOUT; | |
662 | else | |
663 | config->xon_xoff = SP_XONXOFF_IN; | |
664 | } else { | |
665 | if (data->dcb.fOutX) | |
666 | config->xon_xoff = SP_XONXOFF_OUT; | |
667 | else | |
668 | config->xon_xoff = SP_XONXOFF_DISABLED; | |
669 | } | |
670 | ||
671 | #else // !_WIN32 | |
672 | ||
673 | if (tcgetattr(port->fd, &data->term) < 0) | |
674 | return SP_ERR_FAIL; | |
675 | ||
676 | if (ioctl(port->fd, TIOCMGET, &data->controlbits) < 0) | |
677 | return SP_ERR_FAIL; | |
678 | for (i = 0; i < NUM_STD_BAUDRATES; i++) { | |
679 | if (cfgetispeed(&data->term) == std_baudrates[i].index) { | |
680 | config->baudrate = std_baudrates[i].value; | |
681 | break; | |
682 | } | |
683 | } | |
684 | ||
685 | if (i == NUM_STD_BAUDRATES) | |
686 | config->baudrate = -1; | |
687 | ||
688 | switch (data->term.c_cflag & CSIZE) { | |
689 | case CS8: | |
690 | config->bits = 8; | |
691 | break; | |
692 | case CS7: | |
693 | config->bits = 7; | |
694 | break; | |
695 | case CS6: | |
696 | config->bits = 6; | |
697 | break; | |
698 | case CS5: | |
699 | config->bits = 5; | |
700 | break; | |
701 | default: | |
702 | config->bits = -1; | |
703 | } | |
704 | ||
705 | if (!(data->term.c_cflag & PARENB) && (data->term.c_iflag & IGNPAR)) | |
706 | config->parity = SP_PARITY_NONE; | |
707 | else if (!(data->term.c_cflag & PARENB) || (data->term.c_iflag & IGNPAR)) | |
708 | config->parity = -1; | |
709 | else | |
710 | config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_ODD : SP_PARITY_EVEN; | |
711 | ||
712 | config->stopbits = (data->term.c_cflag & CSTOPB) ? 2 : 1; | |
713 | ||
714 | if (data->term.c_cflag & CRTSCTS) { | |
715 | config->rts = SP_RTS_FLOW_CONTROL; | |
716 | config->cts = SP_CTS_FLOW_CONTROL; | |
717 | } else { | |
718 | config->rts = (data->controlbits & TIOCM_RTS) ? SP_RTS_ON : SP_RTS_OFF; | |
719 | config->cts = SP_CTS_IGNORE; | |
720 | } | |
721 | ||
722 | config->dtr = (data->controlbits & TIOCM_DTR) ? SP_DTR_ON : SP_DTR_OFF; | |
723 | config->dsr = SP_DSR_IGNORE; | |
724 | #endif | |
725 | ||
726 | return SP_OK; | |
727 | } | |
728 | ||
729 | static int set_config(struct sp_port *port, struct port_data *data, const struct sp_port_config *config) | |
730 | { | |
731 | unsigned int i; | |
732 | ||
733 | #ifdef _WIN32 | |
734 | if (config->baudrate >= 0) | |
735 | { | |
736 | for (i = 0; i < NUM_STD_BAUDRATES; i++) { | |
737 | if (config->baudrate == std_baudrates[i].value) { | |
738 | data->dcb.BaudRate = std_baudrates[i].index; | |
739 | break; | |
740 | } | |
741 | } | |
742 | ||
743 | if (i == NUM_STD_BAUDRATES) | |
744 | data->dcb.BaudRate = config->baudrate; | |
745 | } | |
746 | ||
747 | if (config->bits >= 0) | |
748 | data->dcb.ByteSize = config->bits; | |
749 | ||
750 | if (config->parity >= 0) { | |
751 | switch (config->parity) { | |
752 | /* Note: There's also SPACEPARITY, MARKPARITY (unneeded so far). */ | |
753 | case SP_PARITY_NONE: | |
754 | data->dcb.Parity = NOPARITY; | |
755 | break; | |
756 | case SP_PARITY_EVEN: | |
757 | data->dcb.Parity = EVENPARITY; | |
758 | break; | |
759 | case SP_PARITY_ODD: | |
760 | data->dcb.Parity = ODDPARITY; | |
761 | break; | |
762 | default: | |
763 | return SP_ERR_ARG; | |
764 | } | |
765 | } | |
766 | ||
767 | if (config->stopbits >= 0) { | |
768 | switch (config->stopbits) { | |
769 | /* Note: There's also ONE5STOPBITS == 1.5 (unneeded so far). */ | |
770 | case 1: | |
771 | data->dcb.StopBits = ONESTOPBIT; | |
772 | break; | |
773 | case 2: | |
774 | data->dcb.StopBits = TWOSTOPBITS; | |
775 | break; | |
776 | default: | |
777 | return SP_ERR_ARG; | |
778 | } | |
779 | } | |
780 | ||
781 | if (config->rts >= 0) { | |
782 | switch (config->rts) { | |
783 | case SP_RTS_OFF: | |
784 | data->dcb.fRtsControl = RTS_CONTROL_DISABLE; | |
785 | break; | |
786 | case SP_RTS_ON: | |
787 | data->dcb.fRtsControl = RTS_CONTROL_ENABLE; | |
788 | break; | |
789 | case SP_RTS_FLOW_CONTROL: | |
790 | data->dcb.fRtsControl = RTS_CONTROL_HANDSHAKE; | |
791 | break; | |
792 | default: | |
793 | return SP_ERR_ARG; | |
794 | } | |
795 | } | |
796 | ||
797 | if (config->cts >= 0) { | |
798 | switch (config->cts) { | |
799 | case SP_CTS_IGNORE: | |
800 | data->dcb.fOutxCtsFlow = FALSE; | |
801 | break; | |
802 | case SP_CTS_FLOW_CONTROL: | |
803 | data->dcb.fOutxCtsFlow = TRUE; | |
804 | break; | |
805 | default: | |
806 | return SP_ERR_ARG; | |
807 | } | |
808 | } | |
809 | ||
810 | if (config->dtr >= 0) { | |
811 | switch (config->dtr) { | |
812 | case SP_DTR_OFF: | |
813 | data->dcb.fDtrControl = DTR_CONTROL_DISABLE; | |
814 | break; | |
815 | case SP_DTR_ON: | |
816 | data->dcb.fDtrControl = DTR_CONTROL_ENABLE; | |
817 | break; | |
818 | case SP_DTR_FLOW_CONTROL: | |
819 | data->dcb.fDtrControl = DTR_CONTROL_HANDSHAKE; | |
820 | break; | |
821 | default: | |
822 | return SP_ERR_ARG; | |
823 | } | |
824 | } | |
825 | ||
826 | if (config->dsr >= 0) { | |
827 | switch (config->dsr) { | |
828 | case SP_DSR_IGNORE: | |
829 | data->dcb.fOutxDsrFlow = FALSE; | |
830 | break; | |
831 | case SP_DSR_FLOW_CONTROL: | |
832 | data->dcb.fOutxDsrFlow = TRUE; | |
833 | break; | |
834 | default: | |
835 | return SP_ERR_ARG; | |
836 | } | |
837 | } | |
838 | ||
839 | if (config->xon_xoff >= 0) { | |
840 | switch (config->xon_xoff) { | |
841 | case SP_XONXOFF_DISABLED: | |
842 | data->dcb.fInX = FALSE; | |
843 | data->dcb.fOutX = FALSE; | |
844 | break; | |
845 | case SP_XONXOFF_IN: | |
846 | data->dcb.fInX = TRUE; | |
847 | data->dcb.fOutX = FALSE; | |
848 | break; | |
849 | case SP_XONXOFF_OUT: | |
850 | data->dcb.fInX = FALSE; | |
851 | data->dcb.fOutX = TRUE; | |
852 | break; | |
853 | case SP_XONXOFF_INOUT: | |
854 | data->dcb.fInX = TRUE; | |
855 | data->dcb.fOutX = TRUE; | |
856 | break; | |
857 | default: | |
858 | return SP_ERR_ARG; | |
859 | } | |
860 | } | |
861 | ||
862 | if (!SetCommState(port->hdl, &data->dcb)) | |
863 | return SP_ERR_FAIL; | |
864 | ||
865 | #else // !_WIN32 | |
866 | ||
867 | if (config->baudrate >= 0) | |
868 | { | |
869 | for (i = 0; i < NUM_STD_BAUDRATES; i++) { | |
870 | if (config->baudrate == std_baudrates[i].value) { | |
871 | if (cfsetospeed(&data->term, std_baudrates[i].index) < 0) | |
872 | return SP_ERR_FAIL; | |
873 | ||
874 | if (cfsetispeed(&data->term, std_baudrates[i].index) < 0) | |
875 | return SP_ERR_FAIL; | |
876 | break; | |
877 | } | |
878 | } | |
879 | ||
880 | if (i == NUM_STD_BAUDRATES) | |
881 | return SP_ERR_ARG; | |
882 | } | |
883 | ||
884 | if (config->bits >= 0) { | |
885 | data->term.c_cflag &= ~CSIZE; | |
886 | switch (config->bits) { | |
887 | case 8: | |
888 | data->term.c_cflag |= CS8; | |
889 | break; | |
890 | case 7: | |
891 | data->term.c_cflag |= CS7; | |
892 | break; | |
893 | case 6: | |
894 | data->term.c_cflag |= CS6; | |
895 | break; | |
896 | default: | |
897 | return SP_ERR_ARG; | |
898 | } | |
899 | } | |
900 | ||
901 | if (config->parity >= 0) { | |
902 | data->term.c_iflag &= ~IGNPAR; | |
903 | data->term.c_cflag &= ~(PARENB | PARODD); | |
904 | switch (config->parity) { | |
905 | case SP_PARITY_NONE: | |
906 | data->term.c_iflag |= IGNPAR; | |
907 | break; | |
908 | case SP_PARITY_EVEN: | |
909 | data->term.c_cflag |= PARENB; | |
910 | break; | |
911 | case SP_PARITY_ODD: | |
912 | data->term.c_cflag |= PARENB | PARODD; | |
913 | break; | |
914 | default: | |
915 | return SP_ERR_ARG; | |
916 | } | |
917 | } | |
918 | ||
919 | if (config->stopbits >= 0) { | |
920 | data->term.c_cflag &= ~CSTOPB; | |
921 | switch (config->stopbits) { | |
922 | case 1: | |
923 | data->term.c_cflag &= ~CSTOPB; | |
924 | break; | |
925 | case 2: | |
926 | data->term.c_cflag |= CSTOPB; | |
927 | break; | |
928 | default: | |
929 | return SP_ERR_ARG; | |
930 | } | |
931 | } | |
932 | ||
933 | if (config->rts >= 0 || config->cts >= 0) | |
934 | { | |
935 | /* Asymmetric use of RTS/CTS not supported yet. */ | |
936 | ||
937 | if (data->term.c_iflag & CRTSCTS) { | |
938 | /* Flow control can only be disabled for both RTS & CTS together. */ | |
939 | if (config->rts >= 0 && config->rts != SP_RTS_FLOW_CONTROL) { | |
940 | if (config->cts != SP_CTS_IGNORE) | |
941 | return SP_ERR_ARG; | |
942 | } | |
943 | if (config->cts >= 0 && config->cts != SP_CTS_FLOW_CONTROL) { | |
944 | if (config->rts <= 0 || config->rts == SP_RTS_FLOW_CONTROL) | |
945 | return SP_ERR_ARG; | |
946 | } | |
947 | } else { | |
948 | /* Flow control can only be enabled for both RTS & CTS together. */ | |
949 | if (((config->rts == SP_RTS_FLOW_CONTROL) && (config->cts != SP_CTS_FLOW_CONTROL)) || | |
950 | ((config->cts == SP_CTS_FLOW_CONTROL) && (config->rts != SP_RTS_FLOW_CONTROL))) | |
951 | return SP_ERR_ARG; | |
952 | } | |
953 | ||
954 | if (config->rts >= 0) { | |
955 | if (config->rts == SP_RTS_FLOW_CONTROL) { | |
956 | data->term.c_iflag |= CRTSCTS; | |
957 | } else { | |
958 | int controlbits = TIOCM_RTS; | |
959 | if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC, | |
960 | &controlbits) < 0) | |
961 | return SP_ERR_FAIL; | |
962 | } | |
963 | } | |
964 | } | |
965 | ||
966 | if (config->dtr >= 0 || config->dsr >= 0) | |
967 | { | |
968 | /* DTR/DSR flow control not supported yet. */ | |
969 | if (config->dtr == SP_DTR_FLOW_CONTROL || config->dsr == SP_DSR_FLOW_CONTROL) | |
970 | return SP_ERR_ARG; | |
971 | ||
972 | if (config->dtr >= 0) { | |
973 | int controlbits = TIOCM_DTR; | |
974 | if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC, | |
975 | &controlbits) < 0) | |
976 | return SP_ERR_FAIL; | |
977 | } | |
978 | } | |
979 | ||
980 | if (config->xon_xoff >= 0) { | |
981 | data->term.c_iflag &= ~(IXON | IXOFF | IXANY); | |
982 | switch (config->xon_xoff) { | |
983 | case SP_XONXOFF_DISABLED: | |
984 | break; | |
985 | case SP_XONXOFF_IN: | |
986 | data->term.c_iflag |= IXOFF; | |
987 | break; | |
988 | case SP_XONXOFF_OUT: | |
989 | data->term.c_iflag |= IXON | IXANY; | |
990 | break; | |
991 | case SP_XONXOFF_INOUT: | |
992 | data->term.c_iflag |= IXON | IXOFF | IXANY; | |
993 | break; | |
994 | default: | |
995 | return SP_ERR_ARG; | |
996 | } | |
997 | } | |
998 | ||
999 | if (tcsetattr(port->fd, TCSADRAIN, &data->term) < 0) | |
1000 | return SP_ERR_FAIL; | |
1001 | #endif | |
1002 | ||
1003 | return SP_OK; | |
1004 | } | |
1005 | ||
1006 | #define TRY(x) do { int ret = x; if (ret != SP_OK) return ret; } while (0) | |
1007 | ||
1008 | int sp_set_config(struct sp_port *port, const struct sp_port_config *config) | |
1009 | { | |
1010 | struct port_data data; | |
1011 | struct sp_port_config prev_config; | |
1012 | ||
1013 | CHECK_PORT(); | |
1014 | ||
1015 | if (!config) | |
1016 | return SP_ERR_ARG; | |
1017 | ||
1018 | TRY(get_config(port, &data, &prev_config)); | |
1019 | TRY(set_config(port, &data, config)); | |
1020 | ||
1021 | return SP_OK; | |
1022 | } | |
1023 | ||
1024 | #define CREATE_SETTER(x) int sp_set_##x(struct sp_port *port, int x) { \ | |
1025 | struct port_data data; \ | |
1026 | struct sp_port_config config; \ | |
1027 | CHECK_PORT(); \ | |
1028 | TRY(get_config(port, &data, &config)); \ | |
1029 | config.x = x; \ | |
1030 | TRY(set_config(port, &data, &config)); \ | |
1031 | return SP_OK; \ | |
1032 | } | |
1033 | ||
1034 | CREATE_SETTER(baudrate) | |
1035 | CREATE_SETTER(bits) | |
1036 | CREATE_SETTER(parity) | |
1037 | CREATE_SETTER(stopbits) | |
1038 | CREATE_SETTER(rts) | |
1039 | CREATE_SETTER(cts) | |
1040 | CREATE_SETTER(dtr) | |
1041 | CREATE_SETTER(dsr) | |
1042 | CREATE_SETTER(xon_xoff) | |
1043 | ||
1044 | int sp_set_flowcontrol(struct sp_port *port, int flowcontrol) | |
1045 | { | |
1046 | struct port_data data; | |
1047 | struct sp_port_config config; | |
1048 | ||
1049 | CHECK_PORT(); | |
1050 | ||
1051 | TRY(get_config(port, &data, &config)); | |
1052 | ||
1053 | if (flowcontrol == SP_FLOWCONTROL_XONXOFF) | |
1054 | config.xon_xoff = SP_XONXOFF_INOUT; | |
1055 | else | |
1056 | config.xon_xoff = SP_XONXOFF_DISABLED; | |
1057 | ||
1058 | if (flowcontrol == SP_FLOWCONTROL_RTSCTS) { | |
1059 | config.rts = SP_RTS_FLOW_CONTROL; | |
1060 | config.cts = SP_CTS_FLOW_CONTROL; | |
1061 | } else { | |
1062 | if (config.rts == SP_RTS_FLOW_CONTROL) | |
1063 | config.rts = SP_RTS_ON; | |
1064 | config.cts = SP_CTS_IGNORE; | |
1065 | } | |
1066 | ||
1067 | if (flowcontrol == SP_FLOWCONTROL_DTRDSR) { | |
1068 | config.dtr = SP_DTR_FLOW_CONTROL; | |
1069 | config.dsr = SP_DSR_FLOW_CONTROL; | |
1070 | } else { | |
1071 | if (config.dtr == SP_DTR_FLOW_CONTROL) | |
1072 | config.dtr = SP_DTR_ON; | |
1073 | config.dsr = SP_DSR_IGNORE; | |
1074 | } | |
1075 | ||
1076 | TRY(set_config(port, &data, &config)); | |
1077 | ||
1078 | return SP_OK; | |
1079 | } | |
1080 | ||
1081 | int sp_last_error_code(void) | |
1082 | { | |
1083 | #ifdef _WIN32 | |
1084 | return GetLastError(); | |
1085 | #else | |
1086 | return errno; | |
1087 | #endif | |
1088 | } | |
1089 | ||
1090 | char *sp_last_error_message(void) | |
1091 | { | |
1092 | #ifdef _WIN32 | |
1093 | LPVOID message; | |
1094 | DWORD error = GetLastError(); | |
1095 | ||
1096 | FormatMessage( | |
1097 | FORMAT_MESSAGE_ALLOCATE_BUFFER | | |
1098 | FORMAT_MESSAGE_FROM_SYSTEM | | |
1099 | FORMAT_MESSAGE_IGNORE_INSERTS, | |
1100 | NULL, | |
1101 | error, | |
1102 | MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), | |
1103 | (LPTSTR) &message, | |
1104 | 0, NULL ); | |
1105 | ||
1106 | return message; | |
1107 | #else | |
1108 | return strerror(errno); | |
1109 | #endif | |
1110 | } | |
1111 | ||
1112 | void sp_free_error_message(char *message) | |
1113 | { | |
1114 | #ifdef _WIN32 | |
1115 | LocalFree(message); | |
1116 | #else | |
1117 | (void)message; | |
1118 | #endif | |
1119 | } |