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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) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de> | |
6 | * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com> | |
7 | * | |
8 | * This program is free software: you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation, either version 3 of the License, or | |
11 | * (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 General Public License | |
19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
22 | #include <string.h> | |
23 | #include <stdlib.h> | |
24 | #include <glib.h> | |
25 | #include <glib/gstdio.h> | |
26 | #include <libserialport.h> | |
27 | #include "libsigrok.h" | |
28 | #include "libsigrok-internal.h" | |
29 | ||
30 | #define LOG_PREFIX "serial" | |
31 | ||
32 | /** | |
33 | * Open the specified serial port. | |
34 | * | |
35 | * @param serial Previously initialized serial port structure. | |
36 | * @param flags Flags to use when opening the serial port. Possible flags | |
37 | * include SERIAL_RDWR, SERIAL_RDONLY, SERIAL_NONBLOCK. | |
38 | * | |
39 | * If the serial structure contains a serialcomm string, it will be | |
40 | * passed to serial_set_paramstr() after the port is opened. | |
41 | * | |
42 | * @return SR_OK on success, SR_ERR on failure. | |
43 | */ | |
44 | SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags) | |
45 | { | |
46 | int ret; | |
47 | char *error; | |
48 | int sp_flags = 0; | |
49 | ||
50 | if (!serial) { | |
51 | sr_dbg("Invalid serial port."); | |
52 | return SR_ERR; | |
53 | } | |
54 | ||
55 | sr_spew("Opening serial port '%s' (flags %d).", serial->port, flags); | |
56 | ||
57 | sp_get_port_by_name(serial->port, &serial->data); | |
58 | ||
59 | if (flags & SERIAL_RDWR) | |
60 | sp_flags = (SP_MODE_READ | SP_MODE_WRITE); | |
61 | else if (flags & SERIAL_RDONLY) | |
62 | sp_flags = SP_MODE_READ; | |
63 | ||
64 | serial->nonblocking = (flags & SERIAL_NONBLOCK) ? 1 : 0; | |
65 | ||
66 | ret = sp_open(serial->data, sp_flags); | |
67 | ||
68 | switch (ret) { | |
69 | case SP_ERR_ARG: | |
70 | sr_err("Attempt to open serial port with invalid parameters."); | |
71 | return SR_ERR_ARG; | |
72 | case SP_ERR_FAIL: | |
73 | error = sp_last_error_message(); | |
74 | sr_err("Error opening port (%d): %s.", | |
75 | sp_last_error_code(), error); | |
76 | sp_free_error_message(error); | |
77 | return SR_ERR; | |
78 | } | |
79 | ||
80 | if (serial->serialcomm) | |
81 | return serial_set_paramstr(serial, serial->serialcomm); | |
82 | else | |
83 | return SR_OK; | |
84 | } | |
85 | ||
86 | /** | |
87 | * Close the specified serial port. | |
88 | * | |
89 | * @param serial Previously initialized serial port structure. | |
90 | * | |
91 | * @return SR_OK on success, SR_ERR on failure. | |
92 | */ | |
93 | SR_PRIV int serial_close(struct sr_serial_dev_inst *serial) | |
94 | { | |
95 | int ret; | |
96 | char *error; | |
97 | ||
98 | if (!serial) { | |
99 | sr_dbg("Invalid serial port."); | |
100 | return SR_ERR; | |
101 | } | |
102 | ||
103 | if (!serial->data) { | |
104 | sr_dbg("Cannot close unopened serial port %s.", serial->port); | |
105 | return SR_ERR; | |
106 | } | |
107 | ||
108 | sr_spew("Closing serial port %s.", serial->port); | |
109 | ||
110 | ret = sp_close(serial->data); | |
111 | ||
112 | switch (ret) { | |
113 | case SP_ERR_ARG: | |
114 | sr_err("Attempt to close an invalid serial port."); | |
115 | return SR_ERR_ARG; | |
116 | case SP_ERR_FAIL: | |
117 | error = sp_last_error_message(); | |
118 | sr_err("Error closing port (%d): %s.", | |
119 | sp_last_error_code(), error); | |
120 | sp_free_error_message(error); | |
121 | return SR_ERR; | |
122 | } | |
123 | ||
124 | sp_free_port(serial->data); | |
125 | serial->data = NULL; | |
126 | ||
127 | return SR_OK; | |
128 | } | |
129 | ||
130 | /** | |
131 | * Flush serial port buffers. | |
132 | * | |
133 | * @param serial Previously initialized serial port structure. | |
134 | * | |
135 | * @return SR_OK on success, SR_ERR on failure. | |
136 | */ | |
137 | SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial) | |
138 | { | |
139 | int ret; | |
140 | char *error; | |
141 | ||
142 | if (!serial) { | |
143 | sr_dbg("Invalid serial port."); | |
144 | return SR_ERR; | |
145 | } | |
146 | ||
147 | if (!serial->data) { | |
148 | sr_dbg("Cannot flush unopened serial port %s.", serial->port); | |
149 | return SR_ERR; | |
150 | } | |
151 | ||
152 | sr_spew("Flushing serial port %s.", serial->port); | |
153 | ||
154 | ret = sp_flush(serial->data, SP_BUF_BOTH); | |
155 | ||
156 | switch (ret) { | |
157 | case SP_ERR_ARG: | |
158 | sr_err("Attempt to flush an invalid serial port."); | |
159 | return SR_ERR_ARG; | |
160 | case SP_ERR_FAIL: | |
161 | error = sp_last_error_message(); | |
162 | sr_err("Error flushing port (%d): %s.", | |
163 | sp_last_error_code(), error); | |
164 | sp_free_error_message(error); | |
165 | return SR_ERR; | |
166 | } | |
167 | ||
168 | return SR_OK; | |
169 | } | |
170 | ||
171 | static int _serial_write(struct sr_serial_dev_inst *serial, | |
172 | const void *buf, size_t count, int nonblocking) | |
173 | { | |
174 | ssize_t ret; | |
175 | char *error; | |
176 | ||
177 | if (!serial) { | |
178 | sr_dbg("Invalid serial port."); | |
179 | return SR_ERR; | |
180 | } | |
181 | ||
182 | if (!serial->data) { | |
183 | sr_dbg("Cannot use unopened serial port %s.", serial->port); | |
184 | return SR_ERR; | |
185 | } | |
186 | ||
187 | if (nonblocking) | |
188 | ret = sp_nonblocking_write(serial->data, buf, count); | |
189 | else | |
190 | ret = sp_blocking_write(serial->data, buf, count, 0); | |
191 | ||
192 | switch (ret) { | |
193 | case SP_ERR_ARG: | |
194 | sr_err("Attempted serial port write with invalid arguments."); | |
195 | return SR_ERR_ARG; | |
196 | case SP_ERR_FAIL: | |
197 | error = sp_last_error_message(); | |
198 | sr_err("Write error (%d): %s.", sp_last_error_code(), error); | |
199 | sp_free_error_message(error); | |
200 | return SR_ERR; | |
201 | } | |
202 | ||
203 | sr_spew("Wrote %d/%d bytes.", ret, count); | |
204 | ||
205 | return ret; | |
206 | } | |
207 | ||
208 | /** | |
209 | * Write a number of bytes to the specified serial port. | |
210 | * | |
211 | * @param serial Previously initialized serial port structure. | |
212 | * @param buf Buffer containing the bytes to write. | |
213 | * @param count Number of bytes to write. | |
214 | * | |
215 | * @return The number of bytes written, or a negative error code upon failure. | |
216 | */ | |
217 | SR_PRIV int serial_write(struct sr_serial_dev_inst *serial, | |
218 | const void *buf, size_t count) | |
219 | { | |
220 | return _serial_write(serial, buf, count, serial->nonblocking); | |
221 | } | |
222 | ||
223 | SR_PRIV int serial_write_blocking(struct sr_serial_dev_inst *serial, | |
224 | const void *buf, size_t count) | |
225 | { | |
226 | return _serial_write(serial, buf, count, 0); | |
227 | } | |
228 | ||
229 | SR_PRIV int serial_write_nonblocking(struct sr_serial_dev_inst *serial, | |
230 | const void *buf, size_t count) | |
231 | { | |
232 | return _serial_write(serial, buf, count, 1); | |
233 | } | |
234 | ||
235 | static int _serial_read(struct sr_serial_dev_inst *serial, void *buf, | |
236 | size_t count, int nonblocking) | |
237 | { | |
238 | ssize_t ret; | |
239 | char *error; | |
240 | ||
241 | if (!serial) { | |
242 | sr_dbg("Invalid serial port."); | |
243 | return SR_ERR; | |
244 | } | |
245 | ||
246 | if (!serial->data) { | |
247 | sr_dbg("Cannot use unopened serial port %s.", serial->port); | |
248 | return SR_ERR; | |
249 | } | |
250 | ||
251 | if (nonblocking) | |
252 | ret = sp_nonblocking_read(serial->data, buf, count); | |
253 | else | |
254 | ret = sp_blocking_read(serial->data, buf, count, 0); | |
255 | ||
256 | switch (ret) { | |
257 | case SP_ERR_ARG: | |
258 | sr_err("Attempted serial port read with invalid arguments."); | |
259 | return SR_ERR_ARG; | |
260 | case SP_ERR_FAIL: | |
261 | error = sp_last_error_message(); | |
262 | sr_err("Read error (%d): %s.", sp_last_error_code(), error); | |
263 | sp_free_error_message(error); | |
264 | return SR_ERR; | |
265 | } | |
266 | ||
267 | if (ret > 0) | |
268 | sr_spew("Read %d/%d bytes.", ret, count); | |
269 | ||
270 | return ret; | |
271 | } | |
272 | ||
273 | /** | |
274 | * Read a number of bytes from the specified serial port. | |
275 | * | |
276 | * @param serial Previously initialized serial port structure. | |
277 | * @param buf Buffer where to store the bytes that are read. | |
278 | * @param count The number of bytes to read. | |
279 | * | |
280 | * @return The number of bytes read, or a negative error code upon failure. | |
281 | */ | |
282 | SR_PRIV int serial_read(struct sr_serial_dev_inst *serial, void *buf, | |
283 | size_t count) | |
284 | { | |
285 | return _serial_read(serial, buf, count, serial->nonblocking); | |
286 | } | |
287 | ||
288 | SR_PRIV int serial_read_blocking(struct sr_serial_dev_inst *serial, void *buf, | |
289 | size_t count) | |
290 | { | |
291 | return _serial_read(serial, buf, count, 0); | |
292 | } | |
293 | ||
294 | SR_PRIV int serial_read_nonblocking(struct sr_serial_dev_inst *serial, void *buf, | |
295 | size_t count) | |
296 | { | |
297 | return _serial_read(serial, buf, count, 1); | |
298 | } | |
299 | ||
300 | /** | |
301 | * Set serial parameters for the specified serial port. | |
302 | * | |
303 | * @param serial Previously initialized serial port structure. | |
304 | * @param[in] baudrate The baudrate to set. | |
305 | * @param[in] bits The number of data bits to use (5, 6, 7 or 8). | |
306 | * @param[in] parity The parity setting to use (0 = none, 1 = even, 2 = odd). | |
307 | * @param[in] stopbits The number of stop bits to use (1 or 2). | |
308 | * @param[in] flowcontrol The flow control settings to use (0 = none, | |
309 | * 1 = RTS/CTS, 2 = XON/XOFF). | |
310 | * @param[in] rts Status of RTS line (0 or 1; required by some interfaces). | |
311 | * @param[in] dtr Status of DTR line (0 or 1; required by some interfaces). | |
312 | * | |
313 | * @retval SR_OK Success | |
314 | * @retval SR_ERR Failure. | |
315 | */ | |
316 | SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial, int baudrate, | |
317 | int bits, int parity, int stopbits, | |
318 | int flowcontrol, int rts, int dtr) | |
319 | { | |
320 | int ret; | |
321 | char *error; | |
322 | struct sp_port_config *config; | |
323 | ||
324 | if (!serial) { | |
325 | sr_dbg("Invalid serial port."); | |
326 | return SR_ERR; | |
327 | } | |
328 | ||
329 | if (!serial->data) { | |
330 | sr_dbg("Cannot configure unopened serial port %s.", serial->port); | |
331 | return SR_ERR; | |
332 | } | |
333 | ||
334 | sr_spew("Setting serial parameters on port %s.", serial->port); | |
335 | ||
336 | sp_new_config(&config); | |
337 | sp_set_config_baudrate(config, baudrate); | |
338 | sp_set_config_bits(config, bits); | |
339 | switch (parity) { | |
340 | case 0: | |
341 | sp_set_config_parity(config, SP_PARITY_NONE); | |
342 | break; | |
343 | case 1: | |
344 | sp_set_config_parity(config, SP_PARITY_EVEN); | |
345 | break; | |
346 | case 2: | |
347 | sp_set_config_parity(config, SP_PARITY_ODD); | |
348 | break; | |
349 | default: | |
350 | return SR_ERR_ARG; | |
351 | } | |
352 | sp_set_config_stopbits(config, stopbits); | |
353 | sp_set_config_rts(config, flowcontrol == 1 ? SP_RTS_FLOW_CONTROL : rts); | |
354 | sp_set_config_cts(config, flowcontrol == 1 ? SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE); | |
355 | sp_set_config_dtr(config, dtr); | |
356 | sp_set_config_dsr(config, SP_DSR_IGNORE); | |
357 | sp_set_config_xon_xoff(config, flowcontrol == 2 ? SP_XONXOFF_INOUT : SP_XONXOFF_DISABLED); | |
358 | ||
359 | ret = sp_set_config(serial->data, config); | |
360 | sp_free_config(config); | |
361 | ||
362 | switch (ret) { | |
363 | case SP_ERR_ARG: | |
364 | sr_err("Invalid arguments for setting serial port parameters."); | |
365 | return SR_ERR_ARG; | |
366 | case SP_ERR_FAIL: | |
367 | error = sp_last_error_message(); | |
368 | sr_err("Error setting serial port parameters (%d): %s.", | |
369 | sp_last_error_code(), error); | |
370 | sp_free_error_message(error); | |
371 | return SR_ERR; | |
372 | } | |
373 | ||
374 | return SR_OK; | |
375 | } | |
376 | ||
377 | /** | |
378 | * Set serial parameters for the specified serial port from parameter string. | |
379 | * | |
380 | * @param serial Previously initialized serial port structure. | |
381 | * @param[in] paramstr A serial communication parameters string of the form | |
382 | * "<baudrate>/<bits><parity><stopbits>{/<option>}".\n | |
383 | * Examples: "9600/8n1", "600/7o2/dtr=1/rts=0" or "460800/8n1/flow=2".\n | |
384 | * \<baudrate\>=integer Baud rate.\n | |
385 | * \<bits\>=5|6|7|8 Number of data bits.\n | |
386 | * \<parity\>=n|e|o None, even, odd.\n | |
387 | * \<stopbits\>=1|2 One or two stop bits.\n | |
388 | * Options:\n | |
389 | * dtr=0|1 Set DTR off resp. on.\n | |
390 | * flow=0|1|2 Flow control. 0 for none, 1 for RTS/CTS, 2 for XON/XOFF.\n | |
391 | * rts=0|1 Set RTS off resp. on.\n | |
392 | * Please note that values and combinations of these parameters must be | |
393 | * supported by the concrete serial interface hardware and the drivers for it. | |
394 | * @retval SR_OK Success. | |
395 | * @retval SR_ERR Failure. | |
396 | */ | |
397 | SR_PRIV int serial_set_paramstr(struct sr_serial_dev_inst *serial, | |
398 | const char *paramstr) | |
399 | { | |
400 | #define SERIAL_COMM_SPEC "^(\\d+)/([5678])([neo])([12])(.*)$" | |
401 | ||
402 | GRegex *reg; | |
403 | GMatchInfo *match; | |
404 | int speed, databits, parity, stopbits, flow, rts, dtr, i; | |
405 | char *mstr, **opts, **kv; | |
406 | ||
407 | speed = databits = parity = stopbits = flow = 0; | |
408 | rts = dtr = -1; | |
409 | sr_spew("Parsing parameters from \"%s\".", paramstr); | |
410 | reg = g_regex_new(SERIAL_COMM_SPEC, 0, 0, NULL); | |
411 | if (g_regex_match(reg, paramstr, 0, &match)) { | |
412 | if ((mstr = g_match_info_fetch(match, 1))) | |
413 | speed = strtoul(mstr, NULL, 10); | |
414 | g_free(mstr); | |
415 | if ((mstr = g_match_info_fetch(match, 2))) | |
416 | databits = strtoul(mstr, NULL, 10); | |
417 | g_free(mstr); | |
418 | if ((mstr = g_match_info_fetch(match, 3))) { | |
419 | switch (mstr[0]) { | |
420 | case 'n': | |
421 | parity = SERIAL_PARITY_NONE; | |
422 | break; | |
423 | case 'e': | |
424 | parity = SERIAL_PARITY_EVEN; | |
425 | break; | |
426 | case 'o': | |
427 | parity = SERIAL_PARITY_ODD; | |
428 | break; | |
429 | } | |
430 | } | |
431 | g_free(mstr); | |
432 | if ((mstr = g_match_info_fetch(match, 4))) | |
433 | stopbits = strtoul(mstr, NULL, 10); | |
434 | g_free(mstr); | |
435 | if ((mstr = g_match_info_fetch(match, 5)) && mstr[0] != '\0') { | |
436 | if (mstr[0] != '/') { | |
437 | sr_dbg("missing separator before extra options"); | |
438 | speed = 0; | |
439 | } else { | |
440 | /* A set of "key=value" options separated by / */ | |
441 | opts = g_strsplit(mstr + 1, "/", 0); | |
442 | for (i = 0; opts[i]; i++) { | |
443 | kv = g_strsplit(opts[i], "=", 2); | |
444 | if (!strncmp(kv[0], "rts", 3)) { | |
445 | if (kv[1][0] == '1') | |
446 | rts = 1; | |
447 | else if (kv[1][0] == '0') | |
448 | rts = 0; | |
449 | else { | |
450 | sr_dbg("invalid value for rts: %c", kv[1][0]); | |
451 | speed = 0; | |
452 | } | |
453 | } else if (!strncmp(kv[0], "dtr", 3)) { | |
454 | if (kv[1][0] == '1') | |
455 | dtr = 1; | |
456 | else if (kv[1][0] == '0') | |
457 | dtr = 0; | |
458 | else { | |
459 | sr_dbg("invalid value for dtr: %c", kv[1][0]); | |
460 | speed = 0; | |
461 | } | |
462 | } else if (!strncmp(kv[0], "flow", 4)) { | |
463 | if (kv[1][0] == '0') | |
464 | flow = 0; | |
465 | else if (kv[1][0] == '1') | |
466 | flow = 1; | |
467 | else if (kv[1][0] == '2') | |
468 | flow = 2; | |
469 | else { | |
470 | sr_dbg("invalid value for flow: %c", kv[1][0]); | |
471 | speed = 0; | |
472 | } | |
473 | } | |
474 | g_strfreev(kv); | |
475 | } | |
476 | g_strfreev(opts); | |
477 | } | |
478 | } | |
479 | g_free(mstr); | |
480 | } | |
481 | g_match_info_unref(match); | |
482 | g_regex_unref(reg); | |
483 | ||
484 | if (speed) { | |
485 | return serial_set_params(serial, speed, databits, parity, | |
486 | stopbits, flow, rts, dtr); | |
487 | } else { | |
488 | sr_dbg("Could not infer speed from parameter string."); | |
489 | return SR_ERR_ARG; | |
490 | } | |
491 | } | |
492 | ||
493 | /** | |
494 | * Read a line from the specified serial port. | |
495 | * | |
496 | * @param serial Previously initialized serial port structure. | |
497 | * @param buf Buffer where to store the bytes that are read. | |
498 | * @param buflen Size of the buffer. | |
499 | * @param[in] timeout_ms How long to wait for a line to come in. | |
500 | * | |
501 | * Reading stops when CR of LR is found, which is stripped from the buffer. | |
502 | * | |
503 | * @retval SR_OK Success. | |
504 | * @retval SR_ERR Failure. | |
505 | */ | |
506 | SR_PRIV int serial_readline(struct sr_serial_dev_inst *serial, char **buf, | |
507 | int *buflen, gint64 timeout_ms) | |
508 | { | |
509 | gint64 start; | |
510 | int maxlen, len; | |
511 | ||
512 | if (!serial) { | |
513 | sr_dbg("Invalid serial port."); | |
514 | return SR_ERR; | |
515 | } | |
516 | ||
517 | if (!serial->data) { | |
518 | sr_dbg("Cannot use unopened serial port %s.", serial->port); | |
519 | return -1; | |
520 | } | |
521 | ||
522 | timeout_ms *= 1000; | |
523 | start = g_get_monotonic_time(); | |
524 | ||
525 | maxlen = *buflen; | |
526 | *buflen = len = 0; | |
527 | while(1) { | |
528 | len = maxlen - *buflen - 1; | |
529 | if (len < 1) | |
530 | break; | |
531 | len = serial_read(serial, *buf + *buflen, 1); | |
532 | if (len > 0) { | |
533 | *buflen += len; | |
534 | *(*buf + *buflen) = '\0'; | |
535 | if (*buflen > 0 && (*(*buf + *buflen - 1) == '\r' | |
536 | || *(*buf + *buflen - 1) == '\n')) { | |
537 | /* Strip CR/LF and terminate. */ | |
538 | *(*buf + --*buflen) = '\0'; | |
539 | break; | |
540 | } | |
541 | } | |
542 | if (g_get_monotonic_time() - start > timeout_ms) | |
543 | /* Timeout */ | |
544 | break; | |
545 | if (len < 1) | |
546 | g_usleep(2000); | |
547 | } | |
548 | if (*buflen) | |
549 | sr_dbg("Received %d: '%s'.", *buflen, *buf); | |
550 | ||
551 | return SR_OK; | |
552 | } | |
553 | ||
554 | /** | |
555 | * Try to find a valid packet in a serial data stream. | |
556 | * | |
557 | * @param serial Previously initialized serial port structure. | |
558 | * @param buf Buffer containing the bytes to write. | |
559 | * @param buflen Size of the buffer. | |
560 | * @param[in] packet_size Size, in bytes, of a valid packet. | |
561 | * @param is_valid Callback that assesses whether the packet is valid or not. | |
562 | * @param[in] timeout_ms The timeout after which, if no packet is detected, to | |
563 | * abort scanning. | |
564 | * @param[in] baudrate The baudrate of the serial port. This parameter is not | |
565 | * critical, but it helps fine tune the serial port polling | |
566 | * delay. | |
567 | * | |
568 | * @retval SR_OK Valid packet was found within the given timeout | |
569 | * @retval SR_ERR Failure. | |
570 | */ | |
571 | SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial, | |
572 | uint8_t *buf, size_t *buflen, | |
573 | size_t packet_size, | |
574 | packet_valid_callback is_valid, | |
575 | uint64_t timeout_ms, int baudrate) | |
576 | { | |
577 | uint64_t start, time, byte_delay_us; | |
578 | size_t ibuf, i, maxlen; | |
579 | int len; | |
580 | ||
581 | maxlen = *buflen; | |
582 | ||
583 | sr_dbg("Detecting packets on %s (timeout = %" PRIu64 | |
584 | "ms, baudrate = %d).", serial->port, timeout_ms, baudrate); | |
585 | ||
586 | if (maxlen < (packet_size / 2) ) { | |
587 | sr_err("Buffer size must be at least twice the packet size."); | |
588 | return SR_ERR; | |
589 | } | |
590 | ||
591 | /* Assume 8n1 transmission. That is 10 bits for every byte. */ | |
592 | byte_delay_us = 10 * (1000000 / baudrate); | |
593 | start = g_get_monotonic_time(); | |
594 | ||
595 | i = ibuf = len = 0; | |
596 | while (ibuf < maxlen) { | |
597 | len = serial_read(serial, &buf[ibuf], 1); | |
598 | if (len > 0) { | |
599 | ibuf += len; | |
600 | } else if (len == 0) { | |
601 | /* No logging, already done in serial_read(). */ | |
602 | } else { | |
603 | /* Error reading byte, but continuing anyway. */ | |
604 | } | |
605 | ||
606 | time = g_get_monotonic_time() - start; | |
607 | time /= 1000; | |
608 | ||
609 | if ((ibuf - i) >= packet_size) { | |
610 | /* We have at least a packet's worth of data. */ | |
611 | if (is_valid(&buf[i])) { | |
612 | sr_spew("Found valid %d-byte packet after " | |
613 | "%" PRIu64 "ms.", (ibuf - i), time); | |
614 | *buflen = ibuf; | |
615 | return SR_OK; | |
616 | } else { | |
617 | sr_spew("Got %d bytes, but not a valid " | |
618 | "packet.", (ibuf - i)); | |
619 | } | |
620 | /* Not a valid packet. Continue searching. */ | |
621 | i++; | |
622 | } | |
623 | if (time >= timeout_ms) { | |
624 | /* Timeout */ | |
625 | sr_dbg("Detection timed out after %dms.", time); | |
626 | break; | |
627 | } | |
628 | if (len < 1) | |
629 | g_usleep(byte_delay_us); | |
630 | } | |
631 | ||
632 | *buflen = ibuf; | |
633 | ||
634 | sr_err("Didn't find a valid packet (read %d bytes).", *buflen); | |
635 | ||
636 | return SR_ERR; | |
637 | } | |
638 | ||
639 | /** | |
640 | * Extract the serial device and options from the options linked list. | |
641 | * | |
642 | * @param options List of options passed from the command line. | |
643 | * @param serial_device Pointer where to store the exctracted serial device. | |
644 | * @param serial_options Pointer where to store the optional extracted serial | |
645 | * options. | |
646 | * | |
647 | * @return SR_OK if a serial_device is found, SR_ERR if no device is found. The | |
648 | * returned string should not be freed by the caller. | |
649 | */ | |
650 | SR_PRIV int sr_serial_extract_options(GSList *options, const char **serial_device, | |
651 | const char **serial_options) | |
652 | { | |
653 | GSList *l; | |
654 | struct sr_config *src; | |
655 | ||
656 | *serial_device = NULL; | |
657 | ||
658 | for (l = options; l; l = l->next) { | |
659 | src = l->data; | |
660 | switch (src->key) { | |
661 | case SR_CONF_CONN: | |
662 | *serial_device = g_variant_get_string(src->data, NULL); | |
663 | sr_dbg("Parsed serial device: %s", *serial_device); | |
664 | break; | |
665 | ||
666 | case SR_CONF_SERIALCOMM: | |
667 | *serial_options = g_variant_get_string(src->data, NULL); | |
668 | sr_dbg("Parsed serial options: %s", *serial_options); | |
669 | break; | |
670 | } | |
671 | } | |
672 | ||
673 | if (!*serial_device) { | |
674 | sr_dbg("No serial device specified"); | |
675 | return SR_ERR; | |
676 | } | |
677 | ||
678 | return SR_OK; | |
679 | } | |
680 | ||
681 | #ifdef _WIN32 | |
682 | typedef HANDLE event_handle; | |
683 | #else | |
684 | typedef int event_handle; | |
685 | #endif | |
686 | ||
687 | SR_PRIV int serial_source_add(struct sr_serial_dev_inst *serial, int events, | |
688 | int timeout, sr_receive_data_callback cb, void *cb_data) | |
689 | { | |
690 | enum sp_event mask = 0; | |
691 | unsigned int i; | |
692 | ||
693 | if (sp_new_event_set(&serial->event_set) != SP_OK) | |
694 | return SR_ERR; | |
695 | ||
696 | if (events & G_IO_IN) | |
697 | mask |= SP_EVENT_RX_READY; | |
698 | if (events & G_IO_OUT) | |
699 | mask |= SP_EVENT_TX_READY; | |
700 | if (events & G_IO_ERR) | |
701 | mask |= SP_EVENT_ERROR; | |
702 | ||
703 | if (sp_add_port_events(serial->event_set, serial->data, mask) != SP_OK) { | |
704 | sp_free_event_set(serial->event_set); | |
705 | return SR_ERR; | |
706 | } | |
707 | ||
708 | serial->pollfds = (GPollFD *) g_malloc0(sizeof(GPollFD) * serial->event_set->count); | |
709 | ||
710 | for (i = 0; i < serial->event_set->count; i++) { | |
711 | ||
712 | serial->pollfds[i].fd = ((event_handle *) serial->event_set->handles)[i]; | |
713 | ||
714 | mask = serial->event_set->masks[i]; | |
715 | ||
716 | if (mask & SP_EVENT_RX_READY) | |
717 | serial->pollfds[i].events |= G_IO_IN; | |
718 | if (mask & SP_EVENT_TX_READY) | |
719 | serial->pollfds[i].events |= G_IO_OUT; | |
720 | if (mask & SP_EVENT_ERROR) | |
721 | serial->pollfds[i].events |= G_IO_ERR; | |
722 | ||
723 | if (sr_session_source_add_pollfd(&serial->pollfds[i], | |
724 | timeout, cb, cb_data) != SR_OK) | |
725 | return SR_ERR; | |
726 | } | |
727 | ||
728 | return SR_OK; | |
729 | } | |
730 | ||
731 | SR_PRIV int serial_source_remove(struct sr_serial_dev_inst *serial) | |
732 | { | |
733 | unsigned int i; | |
734 | ||
735 | for (i = 0; i < serial->event_set->count; i++) | |
736 | if (sr_session_source_remove_pollfd(&serial->pollfds[i]) != SR_OK) | |
737 | return SR_ERR; | |
738 | ||
739 | g_free(serial->pollfds); | |
740 | sp_free_event_set(serial->event_set); | |
741 | ||
742 | serial->pollfds = NULL; | |
743 | serial->event_set = NULL; | |
744 | ||
745 | return SR_OK; | |
746 | } | |
747 | ||
748 | /** | |
749 | * Find USB serial devices via the USB vendor ID and product ID. | |
750 | * | |
751 | * @param vendor_id Vendor ID of the USB device. | |
752 | * @param product_id Product ID of the USB device. | |
753 | * | |
754 | * @return A GSList of strings containing the path of the serial device or | |
755 | * NULL if no serial device is found. The returned list must be freed | |
756 | * by the caller. | |
757 | */ | |
758 | SR_PRIV GSList *sr_serial_find_usb(uint16_t vendor_id, uint16_t product_id) | |
759 | { | |
760 | #ifdef __linux__ | |
761 | const gchar *usb_dev; | |
762 | const char device_tree[] = "/sys/bus/usb/devices/"; | |
763 | GDir *devices_dir, *device_dir; | |
764 | GSList *l = NULL; | |
765 | GSList *tty_devs; | |
766 | GSList *matched_paths; | |
767 | FILE *fd; | |
768 | char tmp[5]; | |
769 | gchar *vendor_path, *product_path, *path_copy; | |
770 | gchar *prefix, *subdir_path, *device_path, *tty_path; | |
771 | unsigned long read_vendor_id, read_product_id; | |
772 | const char *file; | |
773 | ||
774 | l = NULL; | |
775 | tty_devs = NULL; | |
776 | matched_paths = NULL; | |
777 | ||
778 | if (!(devices_dir = g_dir_open(device_tree, 0, NULL))) | |
779 | return NULL; | |
780 | ||
781 | /* | |
782 | * Find potential candidates using the vendor ID and product ID | |
783 | * and store them in matched_paths. | |
784 | */ | |
785 | while ((usb_dev = g_dir_read_name(devices_dir))) { | |
786 | vendor_path = g_strconcat(device_tree, | |
787 | usb_dev, "/idVendor", NULL); | |
788 | product_path = g_strconcat(device_tree, | |
789 | usb_dev, "/idProduct", NULL); | |
790 | ||
791 | if (!g_file_test(vendor_path, G_FILE_TEST_EXISTS) || | |
792 | !g_file_test(product_path, G_FILE_TEST_EXISTS)) | |
793 | goto skip_device; | |
794 | ||
795 | if ((fd = g_fopen(vendor_path, "r")) == NULL) | |
796 | goto skip_device; | |
797 | ||
798 | if (fgets(tmp, sizeof(tmp), fd) == NULL) { | |
799 | fclose(fd); | |
800 | goto skip_device; | |
801 | } | |
802 | read_vendor_id = strtoul(tmp, NULL, 16); | |
803 | ||
804 | fclose(fd); | |
805 | ||
806 | if ((fd = g_fopen(product_path, "r")) == NULL) | |
807 | goto skip_device; | |
808 | ||
809 | if (fgets(tmp, sizeof(tmp), fd) == NULL) { | |
810 | fclose(fd); | |
811 | goto skip_device; | |
812 | } | |
813 | read_product_id = strtoul(tmp, NULL, 16); | |
814 | ||
815 | fclose(fd); | |
816 | ||
817 | if (vendor_id == read_vendor_id && | |
818 | product_id == read_product_id) { | |
819 | path_copy = g_strdup(usb_dev); | |
820 | matched_paths = g_slist_prepend(matched_paths, | |
821 | path_copy); | |
822 | } | |
823 | ||
824 | skip_device: | |
825 | g_free(vendor_path); | |
826 | g_free(product_path); | |
827 | } | |
828 | g_dir_close(devices_dir); | |
829 | ||
830 | /* For every matched device try to find a ttyUSBX subfolder. */ | |
831 | for (l = matched_paths; l; l = l->next) { | |
832 | subdir_path = NULL; | |
833 | ||
834 | device_path = g_strconcat(device_tree, l->data, NULL); | |
835 | ||
836 | if (!(device_dir = g_dir_open(device_path, 0, NULL))) { | |
837 | g_free(device_path); | |
838 | continue; | |
839 | } | |
840 | ||
841 | prefix = g_strconcat(l->data, ":", NULL); | |
842 | ||
843 | while ((file = g_dir_read_name(device_dir))) { | |
844 | if (g_str_has_prefix(file, prefix)) { | |
845 | subdir_path = g_strconcat(device_path, | |
846 | "/", file, NULL); | |
847 | break; | |
848 | } | |
849 | } | |
850 | g_dir_close(device_dir); | |
851 | ||
852 | g_free(prefix); | |
853 | g_free(device_path); | |
854 | ||
855 | if (subdir_path) { | |
856 | if (!(device_dir = g_dir_open(subdir_path, 0, NULL))) { | |
857 | g_free(subdir_path); | |
858 | continue; | |
859 | } | |
860 | g_free(subdir_path); | |
861 | ||
862 | while ((file = g_dir_read_name(device_dir))) { | |
863 | if (g_str_has_prefix(file, "ttyUSB")) { | |
864 | tty_path = g_strconcat("/dev/", | |
865 | file, NULL); | |
866 | sr_dbg("Found USB device %04x:%04x attached to %s.", | |
867 | vendor_id, product_id, tty_path); | |
868 | tty_devs = g_slist_prepend(tty_devs, | |
869 | tty_path); | |
870 | break; | |
871 | } | |
872 | } | |
873 | g_dir_close(device_dir); | |
874 | } | |
875 | } | |
876 | g_slist_free_full(matched_paths, g_free); | |
877 | ||
878 | return tty_devs; | |
879 | #else | |
880 | (void)vendor_id; | |
881 | (void)product_id; | |
882 | ||
883 | return NULL; | |
884 | #endif | |
885 | } |