summaryrefslogtreecommitdiffstats
path: root/meta/recipes-connectivity/gsm/files/0001-Introduce-ports.patch
blob: 2a954d6d8b1f02119c9116f9e019244efd09852d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
Upstream-Status: Inappropriate [not used]

From 516d67c679101d1503dbd4c0613bcd6ff1b604e4 Mon Sep 17 00:00:00 2001
From: Andrzej Zaborowski <balrog@zabor.org>
Date: Wed, 19 Sep 2007 14:03:28 +0200
Subject: [PATCH] Introduce ports.

---
 include/gsmd/atcmd.h        |    2 +-
 include/gsmd/gsmd.h         |    7 +-
 include/gsmd/uart.h         |   28 ++++++
 include/gsmd/vendorplugin.h |    4 +-
 src/gsmd/Makefile.am        |    2 +-
 src/gsmd/atcmd.c            |  177 +++++++++++++++++---------------------
 src/gsmd/gsmd.c             |   64 ++------------
 src/gsmd/uart.c             |  202 +++++++++++++++++++++++++++++++++++++++++++
 8 files changed, 328 insertions(+), 158 deletions(-)
 create mode 100644 include/gsmd/uart.h
 create mode 100644 src/gsmd/uart.c

diff --git a/include/gsmd/atcmd.h b/include/gsmd/atcmd.h
index 0d6c62a..a1af6a0 100644
--- a/include/gsmd/atcmd.h
+++ b/include/gsmd/atcmd.h
@@ -9,7 +9,7 @@ typedef int atcmd_cb_t(struct gsmd_atcmd *cmd, void *ctx, char *resp);
 
 extern struct gsmd_atcmd *atcmd_fill(const char *cmd, int rlen, atcmd_cb_t *cb, void *ctx, u_int16_t id);
 extern int atcmd_submit(struct gsmd *g, struct gsmd_atcmd *cmd);
-extern int atcmd_init(struct gsmd *g, int sockfd);
+extern int atcmd_init(struct gsmd *g, struct gsmd_port *port);
 extern void atcmd_drain(int fd);
 
 #endif /* __GSMD__ */
diff --git a/include/gsmd/gsmd.h b/include/gsmd/gsmd.h
index ed334f1..4afdf66 100644
--- a/include/gsmd/gsmd.h
+++ b/include/gsmd/gsmd.h
@@ -10,6 +10,7 @@
 #include <gsmd/machineplugin.h>
 #include <gsmd/vendorplugin.h>
 #include <gsmd/select.h>
+#include <gsmd/uart.h>
 #include <gsmd/state.h>
 
 void *gsmd_tallocs;
@@ -52,6 +53,7 @@ enum llparse_state {
 #define MLPARSE_BUF_SIZE	65535
 
 struct llparser {
+	struct gsmd_port *port;
 	enum llparse_state state;
 	unsigned int len;
 	unsigned int flags;
@@ -70,7 +72,7 @@ struct gsmd;
 struct gsmd {
 	unsigned int flags;
 	int interpreter_ready;
-	struct gsmd_fd gfd_uart;
+	struct gsmd_uart uart;
 	struct gsmd_fd gfd_sock;
 	struct llparser llp;
 	struct llist_head users;
@@ -81,9 +83,10 @@ struct gsmd {
 	struct gsmd_device_state dev_state;
 
 	struct llist_head operators;		/* cached list of operator names */
-	unsigned char *mlbuf;		/* ml_parse buffer */
+	char *mlbuf;			/* ml_parse buffer */
 	unsigned int mlbuf_len;
 	int mlunsolicited;
+	int clear_to_send;
 };
 
 struct gsmd_user {
diff --git a/include/gsmd/uart.h b/include/gsmd/uart.h
new file mode 100644
index 0000000..a006fa7
--- /dev/null
+++ b/include/gsmd/uart.h
@@ -0,0 +1,28 @@
+#ifndef __GSMD_UART_H
+#define __GSMD_UART_H
+
+#ifdef __GSMD__
+
+struct gsmd_port {
+	int (*write)(struct gsmd_port *port, const char data[], int len);
+	int (*set_break)(struct gsmd_port *port, int state);
+	/* more parameters here */
+	int (*newdata_cb)(void *opaque, const char data[], int len);
+	void *newdata_opaque;
+};
+
+struct gsmd_uart {
+	struct gsmd_port port;
+	struct gsmd_fd gfd;
+	char txfifo[2048];
+	int tx_start;
+	int tx_len;
+};
+
+extern int set_baudrate(int fd, int baudrate, int hwflow);
+extern void uart_drain(int fd);
+extern int uart_init(struct gsmd_uart *uart, int sockfd);
+
+#endif /* __GSMD__ */
+
+#endif
diff --git a/include/gsmd/vendorplugin.h b/include/gsmd/vendorplugin.h
index 1911fef..1c82790 100644
--- a/include/gsmd/vendorplugin.h
+++ b/include/gsmd/vendorplugin.h
@@ -11,8 +11,8 @@ struct gsmd_unsolicit;
 
 struct gsmd_vendor_plugin {
 	struct llist_head list;
-	unsigned char *name;
-	unsigned char *ext_chars;
+	char *name;
+	char *ext_chars;
 	unsigned int num_unsolicit;
 	const struct gsmd_unsolicit *unsolicit;
 	int (*detect)(struct gsmd *g);
diff --git a/src/gsmd/Makefile.am b/src/gsmd/Makefile.am
index 9ac45ee..110b757 100644
--- a/src/gsmd/Makefile.am
+++ b/src/gsmd/Makefile.am
@@ -13,7 +13,7 @@ sbin_PROGRAMS = gsmd
 gsmd_CFLAGS = -D PLUGINDIR=\"$(plugindir)\"
 gsmd_SOURCES = gsmd.c atcmd.c select.c machine.c vendor.c unsolicited.c log.c \
 	       usock.c talloc.c timer.c operator_cache.c ext_response.c \
-	       sms_cb.c sms_pdu.c
+	       sms_cb.c sms_pdu.c uart.c
 gsmd_LDADD = -ldl
 gsmd_LDFLAGS = -Wl,--export-dynamic
 
diff --git a/src/gsmd/atcmd.c b/src/gsmd/atcmd.c
index 2ef6a10..27dfa41 100644
--- a/src/gsmd/atcmd.c
+++ b/src/gsmd/atcmd.c
@@ -159,7 +159,8 @@ static int llparse_byte(struct llparser *llp, char byte)
 	return ret;
 }
 
-static int llparse_string(struct llparser *llp, char *buf, unsigned int len)
+static int llparse_string(struct llparser *llp, const char *buf,
+		unsigned int len)
 {
 	while (len--) {
 		int rc = llparse_byte(llp, *(buf++));
@@ -187,6 +188,55 @@ static int llparse_init(struct llparser *llp)
 	return 0;
 }
 
+/* See if we can now send more commands to the port */
+static void atcmd_wake_queue(struct gsmd *g)
+{
+	int len, rc;
+	char *cr;
+
+	/* write pending commands to UART */
+	while (g->interpreter_ready && g->clear_to_send) {
+		struct gsmd_atcmd *pos, *pos2;
+		llist_for_each_entry_safe(pos, pos2, &g->pending_atcmds, list) {
+			cr = strchr(pos->cur, '\n');
+			if (cr)
+				len = cr - pos->cur;
+			else
+				len = pos->buflen;
+			rc = g->llp.port->write(g->llp.port, pos->cur, len);
+			if (rc == 0) {
+				gsmd_log(GSMD_ERROR,
+						"write returns 0, aborting\n");
+				break;
+			}
+			if (cr && rc == len)
+				rc ++;	/* Skip the \n */
+			pos->buflen -= rc;
+			pos->cur += rc;
+			g->llp.port->write(g->llp.port, "\r", 1);
+
+			if (!pos->buflen) {
+				/* success: remove from global list of
+				 * to-be-sent atcmds */
+				llist_del(&pos->list);
+				/* append to global list of executing atcmds */
+				llist_add_tail(&pos->list, &g->busy_atcmds);
+
+				/* we only send one cmd at the moment */
+				g->clear_to_send = 0;
+				break;
+			} else {
+				/* The write was short or the atcmd has more
+				 * lines to send after a "> ".  */
+				if (rc < len)
+					break;
+				g->clear_to_send = 0;
+				break;
+			}
+		}
+	}
+}
+
 /* mid-level parser */
 
 static int parse_final_result(const char *res)
@@ -216,6 +266,7 @@ static int ml_parse(const char *buf, int len, void *ctx)
 		g->interpreter_ready = 1;
 		gsmd_initsettings(g);
 		gmsd_alive_start(g);
+		atcmd_wake_queue(g);
 		return 0;
 	}
 
@@ -316,6 +367,7 @@ static int ml_parse(const char *buf, int len, void *ctx)
 				} else {
 					DEBUGP("Calling cmd->cb()\n");
 					cmd->resp = g->mlbuf;
+					g->mlbuf[g->mlbuf_len] = 0;
 					rc = cmd->cb(cmd, cmd->ctx, cmd->resp);
 					DEBUGP("Clearing mlbuf\n");
 				}
@@ -370,12 +422,15 @@ static int ml_parse(const char *buf, int len, void *ctx)
 	if (g->mlbuf_len)
 		g->mlbuf[g->mlbuf_len ++] = '\n';
 	DEBUGP("Appending buf to mlbuf\n");
-	if (len > MLPARSE_BUF_SIZE - g->mlbuf_len)
+	if (len > MLPARSE_BUF_SIZE - g->mlbuf_len) {
 		len = MLPARSE_BUF_SIZE - g->mlbuf_len;
+		gsmd_log(GSMD_NOTICE, "g->mlbuf overrun\n");
+	}
 	memcpy(g->mlbuf + g->mlbuf_len, buf, len);
 	g->mlbuf_len += len;
 
 	if (g->mlunsolicited) {
+		g->mlbuf[g->mlbuf_len] = 0;
 		rc = unsolicited_parse(g, g->mlbuf, g->mlbuf_len,
 				strchr(g->mlbuf, ':') + 1);
 		if (rc == -EAGAIN) {
@@ -422,8 +477,11 @@ final_cb:
 
 	/* if we're finished with current commands, but still have pending
 	 * commands: we want to WRITE again */
-	if (llist_empty(&g->busy_atcmds) && !llist_empty(&g->pending_atcmds))
-		g->gfd_uart.when |= GSMD_FD_WRITE;
+	if (llist_empty(&g->busy_atcmds)) {
+		g->clear_to_send = 1;
+		if (!llist_empty(&g->pending_atcmds))
+			atcmd_wake_queue(g);
+	}
 
 	return rc;
 }
@@ -433,85 +491,23 @@ static int atcmd_prompt(void *data)
 {
 	struct gsmd *g = data;
 
-	g->gfd_uart.when |= GSMD_FD_WRITE;
+	g->clear_to_send = 1;
+	atcmd_wake_queue(g);
 }
 
 /* callback to be called if [virtual] UART has some data for us */
-static int atcmd_select_cb(int fd, unsigned int what, void *data)
+static int atcmd_newdata_cb(void *opaque, const char data[], int len)
 {
-	int len, rc;
-	static char rxbuf[1024];
-	struct gsmd *g = data;
-	char *cr;
-
-	if (what & GSMD_FD_READ) {
-		memset(rxbuf, 0, sizeof(rxbuf));
-		while ((len = read(fd, rxbuf, sizeof(rxbuf)))) {
-			if (len < 0) {
-				if (errno == EAGAIN)
-					return 0;
-				gsmd_log(GSMD_NOTICE, "ERROR reading from fd %u: %d (%s)\n", fd, len,
-					strerror(errno));
-					return len;
-			}
-			rc = llparse_string(&g->llp, rxbuf, len);
-			if (rc < 0) {
-				gsmd_log(GSMD_ERROR, "ERROR during llparse_string: %d\n", rc);
-				return rc;
-			}
-		}
-	}
-
-	/* write pending commands to UART */
-	if ((what & GSMD_FD_WRITE) && g->interpreter_ready) {
-		struct gsmd_atcmd *pos, *pos2;
-		llist_for_each_entry_safe(pos, pos2, &g->pending_atcmds, list) {
-			cr = strchr(pos->cur, '\n');
-			if (cr)
-				len = cr - pos->cur;
-			else
-				len = pos->buflen - 1;  /* assuming zero-terminated strings */
-			rc = write(fd, pos->cur, len);
-			if (rc == 0) {
-				gsmd_log(GSMD_ERROR, "write returns 0, aborting\n");
-				break;
-			} else if (rc < 0) {
-				gsmd_log(GSMD_ERROR, "error during write to fd %d: %d\n",
-					fd, rc);
-				return rc;
-			}
-			if (!cr || rc == len)
-				rc ++;	/* Skip the \n or \0 */
-			pos->buflen -= rc;
-			pos->cur += rc;
-			write(fd, "\r", 1);
-
-			if (!pos->buflen) {
-				/* success: remove from global list of
-				 * to-be-sent atcmds */
-				llist_del(&pos->list);
-				/* append to global list of executing atcmds */
-				llist_add_tail(&pos->list, &g->busy_atcmds);
-
-				/* we only send one cmd at the moment */
-				break;
-			} else {
-				/* The write was short or the atcmd has more
-				 * lines to send after a "> ".  */
-				if (rc < len)
-					return 0;
-				break;
-			}
-		}
+	struct gsmd *g = opaque;
+	int rc;
 
-		/* Either pending_atcmds is empty or a command has to wait */
-		g->gfd_uart.when &= ~GSMD_FD_WRITE;
-	}
+	rc = llparse_string(&g->llp, data, len);
+	if (rc < 0)
+		gsmd_log(GSMD_ERROR, "ERROR during llparse_string: %d\n", rc);
 
-	return 0;
+	return rc;
 }
 
-
 struct gsmd_atcmd *atcmd_fill(const char *cmd, int rlen,
 			      atcmd_cb_t cb, void *ctx, u_int16_t id)
 {
@@ -544,36 +540,18 @@ int atcmd_submit(struct gsmd *g, struct gsmd_atcmd *cmd)
 {
 	DEBUGP("submitting command `%s'\n", cmd->buf);
 
-	if (llist_empty(&g->pending_atcmds))
-		g->gfd_uart.when |= GSMD_FD_WRITE;
+	llist_empty(&g->pending_atcmds);
 	llist_add_tail(&cmd->list, &g->pending_atcmds);
+	atcmd_wake_queue(g);
 
 	return 0;
 }
 
-void atcmd_drain(int fd)
-{
-	int rc;
-	struct termios t;
-	rc = tcflush(fd, TCIOFLUSH);
-	rc = tcgetattr(fd, &t);
-	DEBUGP("c_iflag = 0x%08x, c_oflag = 0x%08x, c_cflag = 0x%08x, c_lflag = 0x%08x\n",
-		t.c_iflag, t.c_oflag, t.c_cflag, t.c_lflag);
-	t.c_iflag = t.c_oflag = 0;
-	cfmakeraw(&t);
-	rc = tcsetattr(fd, TCSANOW, &t);
-}
-
 /* init atcmd parser */
-int atcmd_init(struct gsmd *g, int sockfd)
+int atcmd_init(struct gsmd *g, struct gsmd_port *port)
 {
 	__atcmd_ctx = talloc_named_const(gsmd_tallocs, 1, "atcmds");
 
-	g->gfd_uart.fd = sockfd;
-	g->gfd_uart.when = GSMD_FD_READ;
-	g->gfd_uart.data = g;
-	g->gfd_uart.cb = &atcmd_select_cb;
-
 	INIT_LLIST_HEAD(&g->pending_atcmds);
 	INIT_LLIST_HEAD(&g->busy_atcmds);
 
@@ -581,7 +559,9 @@ int atcmd_init(struct gsmd *g, int sockfd)
 
 	g->mlbuf_len = 0;
 	g->mlunsolicited = 0;
+	g->clear_to_send = 1;
 
+	g->llp.port = port;
 	g->llp.cur = g->llp.buf;
 	g->llp.len = sizeof(g->llp.buf);
 	g->llp.cb = &ml_parse;
@@ -589,5 +569,8 @@ int atcmd_init(struct gsmd *g, int sockfd)
 	g->llp.ctx = g;
 	g->llp.flags = LGSM_ATCMD_F_EXTENDED;
 
-	return gsmd_register_fd(&g->gfd_uart);
+	port->newdata_opaque = g;
+	port->newdata_cb = atcmd_newdata_cb;
+
+	return 0;
 }
diff --git a/src/gsmd/gsmd.c b/src/gsmd/gsmd.c
index 51b4f2c..846bd17 100644
--- a/src/gsmd/gsmd.c
+++ b/src/gsmd/gsmd.c
@@ -26,7 +26,6 @@
 #include <string.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <termios.h>
 #include <signal.h>
 
 #define _GNU_SOURCE
@@ -247,56 +246,6 @@ int gsmd_initsettings(struct gsmd *gsmd)
 	return atcmd_submit(gsmd, cmd);
 }
 
-struct bdrt {
-	int bps;
-	u_int32_t b;
-};
-
-static struct bdrt bdrts[] = {
-	{ 0, B0 },
-	{ 9600, B9600 },
-	{ 19200, B19200 },
-	{ 38400, B38400 },
-	{ 57600, B57600 },
-	{ 115200, B115200 },
-	{ 230400, B230400 },
-	{ 460800, B460800 },
-	{ 921600, B921600 },
-};
-
-static int set_baudrate(int fd, int baudrate, int hwflow)
-{
-	int i;
-	u_int32_t bd = 0;
-	struct termios ti;
-
-	for (i = 0; i < ARRAY_SIZE(bdrts); i++) {
-		if (bdrts[i].bps == baudrate)
-			bd = bdrts[i].b;
-	}
-	if (bd == 0)
-		return -EINVAL;
-	
-	i = tcgetattr(fd, &ti);
-	if (i < 0)
-		return i;
-	
-	i = cfsetispeed(&ti, B0);
-	if (i < 0)
-		return i;
-	
-	i = cfsetospeed(&ti, bd);
-	if (i < 0)
-		return i;
-	
-	if (hwflow)
-		ti.c_cflag |= CRTSCTS;
-	else
-		ti.c_cflag &= ~CRTSCTS;
-
-	return tcsetattr(fd, 0, &ti);
-}
-
 static int gsmd_initialize(struct gsmd *g)
 {
 	INIT_LLIST_HEAD(&g->users);
@@ -478,14 +427,19 @@ int main(int argc, char **argv)
 	if (wait >= 0)
 		g.interpreter_ready = !wait;
 
-	if (atcmd_init(&g, fd) < 0) {
+	if (uart_init(&g.uart, fd) < 0) {
 		fprintf(stderr, "can't initialize UART device\n");
 		exit(1);
 	}
 
-  write(fd, "\r", 1);
-  sleep(1);
-	atcmd_drain(fd);
+	if (atcmd_init(&g, &g.uart.port) < 0) {
+		fprintf(stderr, "can't initialize AT parser\n");
+		exit(1);
+	}
+	write(fd, "\r", 1);
+	sleep(1);
+
+	uart_drain(fd);
 
 	if (usock_init(&g) < 0) {
 		fprintf(stderr, "can't open unix socket\n");
diff --git a/src/gsmd/uart.c b/src/gsmd/uart.c
new file mode 100644
index 0000000..22a4a5c
--- /dev/null
+++ b/src/gsmd/uart.c
@@ -0,0 +1,202 @@
+/* Wrapper for the physical UART in a struct gsmd_port abstraction.
+ *
+ * Copyright (C) 2007 OpenMoko, Inc.
+ * Written by Andrzej Zaborowski <andrew@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <string.h>
+#include <fcntl.h>
+#include <termios.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "gsmd.h"
+
+#include <gsmd/gsmd.h>
+
+void uart_drain(int fd)
+{
+	int rc;
+	struct termios t;
+	rc = tcflush(fd, TCIOFLUSH);
+	rc = tcgetattr(fd, &t);
+	DEBUGP(	
+			"c_iflag = 0x%08x, c_oflag = 0x%08x, "
+			"c_cflag = 0x%08x, c_lflag = 0x%08x\n",
+			t.c_iflag, t.c_oflag, t.c_cflag, t.c_lflag);
+	t.c_iflag = t.c_oflag = 0;
+	cfmakeraw(&t);
+	rc = tcsetattr(fd, TCSANOW, &t);
+}
+
+struct bdrt {
+	int bps;
+	u_int32_t b;
+};
+
+static struct bdrt bdrts[] = {
+	{ 0, B0 },
+	{ 9600, B9600 },
+	{ 19200, B19200 },
+	{ 38400, B38400 },
+	{ 57600, B57600 },
+	{ 115200, B115200 },
+	{ 230400, B230400 },
+	{ 460800, B460800 },
+	{ 921600, B921600 },
+};
+
+int set_baudrate(int fd, int baudrate, int hwflow)
+{
+	int i;
+	u_int32_t bd = 0;
+	struct termios ti;
+
+	for (i = 0; i < ARRAY_SIZE(bdrts); i++) {
+		if (bdrts[i].bps == baudrate)
+			bd = bdrts[i].b;
+	}
+	if (bd == 0)
+		return -EINVAL;
+	
+	i = tcgetattr(fd, &ti);
+	if (i < 0)
+		return i;
+	
+	i = cfsetispeed(&ti, B0);
+	if (i < 0)
+		return i;
+	
+	i = cfsetospeed(&ti, bd);
+	if (i < 0)
+		return i;
+	
+	if (hwflow)
+		ti.c_cflag |= CRTSCTS;
+	else
+		ti.c_cflag &= ~CRTSCTS;
+
+	return tcsetattr(fd, 0, &ti);
+}
+
+static int uart_select_cb(int fd, unsigned int what, void *data)
+{
+	struct gsmd_uart *uart = (struct gsmd_uart *) data;
+	static char rxbuf[2048];
+	int rc, len;
+
+	if ((what & GSMD_FD_READ) && uart->port.newdata_cb) {
+		while ((len = read(fd, rxbuf, sizeof(rxbuf)))) {
+			if (len < 0) {
+				if (errno == EAGAIN || errno == EINTR)
+					return 0;
+				gsmd_log(GSMD_NOTICE, "ERROR reading from "
+						"fd %u: %d (%s)\n", fd, errno,
+						strerror(errno));
+				return -errno;
+			}
+
+			rc = uart->port.newdata_cb(
+					uart->port.newdata_opaque,
+					rxbuf,
+					len);
+			if (rc < 0)
+				return rc;
+		}
+	}
+
+	/* Write pending data to UART.  */
+	if ((what & GSMD_FD_WRITE) && uart->tx_len) {
+		while (uart->tx_start + uart->tx_len >= sizeof(uart->txfifo)) {
+			len = sizeof(uart->txfifo) - uart->tx_start;
+			rc = write(fd, &uart->txfifo[uart->tx_start], len);
+			if (rc < 0 && errno != EINTR) {
+				if (errno == EAGAIN)
+					return 0;
+				gsmd_log(GSMD_NOTICE, "ERROR writing "
+						"fd %u: %d (%s)\n", fd, errno,
+						strerror(errno));
+				return -errno;
+			}
+
+			if (rc > 0) {
+				uart->tx_start += rc;
+				uart->tx_len -= rc;
+			}
+		}
+		uart->tx_start &= sizeof(uart->txfifo) - 1;
+
+		while (uart->tx_len) {
+			rc = write(fd, &uart->txfifo[uart->tx_start],
+					uart->tx_len);
+			if (rc < 0 && errno != EINTR) {
+				if (errno == EAGAIN)
+					return 0;
+				gsmd_log(GSMD_NOTICE, "ERROR writing "
+						"fd %u: %d (%s)\n", fd, errno,
+						strerror(errno));
+				return -errno;
+			}
+
+			if (rc > 0) {
+				uart->tx_start += rc;
+				uart->tx_len -= rc;
+			}
+		}
+
+		/* If we reached here, there's no more data for the moment.  */
+		uart->gfd.when &= ~GSMD_FD_WRITE;
+	}
+
+	return 0;
+}
+
+static int uart_write(struct gsmd_port *port, const char data[], int len)
+{
+	struct gsmd_uart *uart = (struct gsmd_uart *) port;
+	int start = (uart->tx_start + uart->tx_len) &
+		(sizeof(uart->txfifo) - 1);
+	int space = sizeof(uart->txfifo) - start;
+
+	if (uart->tx_len + len > sizeof(uart->txfifo))
+		len = sizeof(uart->txfifo) - uart->tx_len;
+
+	if (len)
+		uart->gfd.when |= GSMD_FD_WRITE;
+
+	if (len > space) {
+		memcpy(uart->txfifo + start, data, space);
+		memcpy(uart->txfifo, data + space, len - space);
+	} else
+		memcpy(uart->txfifo + start, data, len);
+
+	uart->tx_len += len;
+	return len;
+}
+
+int uart_init(struct gsmd_uart *uart, int sockfd)
+{
+	uart->gfd.fd = sockfd;
+	uart->gfd.when = GSMD_FD_READ;
+	uart->gfd.data = uart;
+	uart->gfd.cb = &uart_select_cb;
+
+	uart->port.write = uart_write;
+
+	return gsmd_register_fd(&uart->gfd);
+}
-- 
1.5.2.1