Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
  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
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
/* vi: set sw=4 ts=4: */
/*
 * setserial implementation for busybox
 *
 *
 * Copyright (C) 2011 Marek Bečka <yuen@klacno.sk>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

//config:config SETSERIAL
//config:	bool "setserial"
//config:	default y
//config:	select PLATFORM_LINUX
//config:	help
//config:	  Retrieve or set Linux serial port.

//applet:IF_SETSERIAL(APPLET(setserial, BB_DIR_BIN, BB_SUID_DROP))

//kbuild:lib-$(CONFIG_SETSERIAL) += setserial.o

#include "libbb.h"
#include <assert.h>

#ifndef PORT_UNKNOWN
# define PORT_UNKNOWN            0
#endif
#ifndef PORT_8250
# define PORT_8250               1
#endif
#ifndef PORT_16450
# define PORT_16450              2
#endif
#ifndef PORT_16550
# define PORT_16550              3
#endif
#ifndef PORT_16550A
# define PORT_16550A             4
#endif
#ifndef PORT_CIRRUS
# define PORT_CIRRUS             5
#endif
#ifndef PORT_16650
# define PORT_16650              6
#endif
#ifndef PORT_16650V2
# define PORT_16650V2            7
#endif
#ifndef PORT_16750
# define PORT_16750              8
#endif
#ifndef PORT_STARTECH
# define PORT_STARTECH           9
#endif
#ifndef PORT_16C950
# define PORT_16C950            10
#endif
#ifndef PORT_16654
# define PORT_16654             11
#endif
#ifndef PORT_16850
# define PORT_16850             12
#endif
#ifndef PORT_RSA
# define PORT_RSA               13
#endif
#ifndef PORT_NS16550A
# define PORT_NS16550A          14
#endif
#ifndef PORT_XSCALE
# define PORT_XSCALE            15
#endif
#ifndef PORT_RM9000
# define PORT_RM9000            16
#endif
#ifndef PORT_OCTEON
# define PORT_OCTEON            17
#endif
#ifndef PORT_AR7
# define PORT_AR7               18
#endif
#ifndef PORT_U6_16550A
# define PORT_U6_16550A         19
#endif

#ifndef ASYNCB_HUP_NOTIFY
# define ASYNCB_HUP_NOTIFY       0
#endif
#ifndef ASYNCB_FOURPORT
# define ASYNCB_FOURPORT         1
#endif
#ifndef ASYNCB_SAK
# define ASYNCB_SAK              2
#endif
#ifndef ASYNCB_SPLIT_TERMIOS
# define ASYNCB_SPLIT_TERMIOS    3
#endif
#ifndef ASYNCB_SPD_HI
# define ASYNCB_SPD_HI           4
#endif
#ifndef ASYNCB_SPD_VHI
# define ASYNCB_SPD_VHI          5
#endif
#ifndef ASYNCB_SKIP_TEST
# define ASYNCB_SKIP_TEST        6
#endif
#ifndef ASYNCB_AUTO_IRQ
# define ASYNCB_AUTO_IRQ         7
#endif
#ifndef ASYNCB_SESSION_LOCKOUT
# define ASYNCB_SESSION_LOCKOUT  8
#endif
#ifndef ASYNCB_PGRP_LOCKOUT
# define ASYNCB_PGRP_LOCKOUT     9
#endif
#ifndef ASYNCB_CALLOUT_NOHUP
# define ASYNCB_CALLOUT_NOHUP   10
#endif
#ifndef ASYNCB_SPD_SHI
# define ASYNCB_SPD_SHI         12
#endif
#ifndef ASYNCB_LOW_LATENCY
# define ASYNCB_LOW_LATENCY     13
#endif
#ifndef ASYNCB_BUGGY_UART
# define ASYNCB_BUGGY_UART      14
#endif

#ifndef ASYNC_HUP_NOTIFY
# define ASYNC_HUP_NOTIFY       (1U << ASYNCB_HUP_NOTIFY)
#endif
#ifndef ASYNC_FOURPORT
# define ASYNC_FOURPORT         (1U << ASYNCB_FOURPORT)
#endif
#ifndef ASYNC_SAK
# define ASYNC_SAK              (1U << ASYNCB_SAK)
#endif
#ifndef ASYNC_SPLIT_TERMIOS
# define ASYNC_SPLIT_TERMIOS    (1U << ASYNCB_SPLIT_TERMIOS)
#endif
#ifndef ASYNC_SPD_HI
# define ASYNC_SPD_HI           (1U << ASYNCB_SPD_HI)
#endif
#ifndef ASYNC_SPD_VHI
# define ASYNC_SPD_VHI          (1U << ASYNCB_SPD_VHI)
#endif
#ifndef ASYNC_SKIP_TEST
# define ASYNC_SKIP_TEST        (1U << ASYNCB_SKIP_TEST)
#endif
#ifndef ASYNC_AUTO_IRQ
# define ASYNC_AUTO_IRQ         (1U << ASYNCB_AUTO_IRQ)
#endif
#ifndef ASYNC_SESSION_LOCKOUT
# define ASYNC_SESSION_LOCKOUT  (1U << ASYNCB_SESSION_LOCKOUT)
#endif
#ifndef ASYNC_PGRP_LOCKOUT
# define ASYNC_PGRP_LOCKOUT     (1U << ASYNCB_PGRP_LOCKOUT)
#endif
#ifndef ASYNC_CALLOUT_NOHUP
# define ASYNC_CALLOUT_NOHUP    (1U << ASYNCB_CALLOUT_NOHUP)
#endif
#ifndef ASYNC_SPD_SHI
# define ASYNC_SPD_SHI          (1U << ASYNCB_SPD_SHI)
#endif
#ifndef ASYNC_LOW_LATENCY
# define ASYNC_LOW_LATENCY      (1U << ASYNCB_LOW_LATENCY)
#endif
#ifndef ASYNC_BUGGY_UART
# define ASYNC_BUGGY_UART       (1U << ASYNCB_BUGGY_UART)
#endif

#ifndef ASYNC_SPD_CUST
# define ASYNC_SPD_CUST         (ASYNC_SPD_HI|ASYNC_SPD_VHI)
#endif
#ifndef ASYNC_SPD_WARP
# define ASYNC_SPD_WARP         (ASYNC_SPD_HI|ASYNC_SPD_SHI)
#endif
#ifndef ASYNC_SPD_MASK
# define ASYNC_SPD_MASK         (ASYNC_SPD_HI|ASYNC_SPD_VHI|ASYNC_SPD_SHI)
#endif

#ifndef ASYNC_CLOSING_WAIT_INF
# define ASYNC_CLOSING_WAIT_INF         0
#endif
#ifndef ASYNC_CLOSING_WAIT_NONE
# define ASYNC_CLOSING_WAIT_NONE        65535
#endif

#ifndef _LINUX_SERIAL_H
struct serial_struct {
	int	type;
	int	line;
	unsigned int	port;
	int	irq;
	int	flags;
	int	xmit_fifo_size;
	int	custom_divisor;
	int	baud_base;
	unsigned short	close_delay;
	char	io_type;
	char	reserved_char[1];
	int	hub6;
	unsigned short	closing_wait; /* time to wait before closing */
	unsigned short	closing_wait2; /* no longer used... */
	unsigned char	*iomem_base;
	unsigned short	iomem_reg_shift;
	unsigned int	port_high;
	unsigned long	iomap_base;	/* cookie passed into ioremap */
};
#endif

//usage:#define setserial_trivial_usage
//usage:	"[-gabGvzV] DEVICE [PARAMETER [ARG]]..."
//usage:#define setserial_full_usage "\n\n"
//usage:	"Request or set Linux serial port information\n"
//usage:	"\n"
//usage:	"	-g	Interpret parameters as list of devices for reporting\n"
//usage:	"	-a	Print all available information\n"
//usage:	"	-b	Print summary information\n"
//usage:	"	-G	Print in form which can be fed back\n"
//usage:	"		to setserial as command line parameters\n"
//usage:	"	-z	Zero out serial flags before setting\n"
//usage:	"	-v	Verbose\n"
//usage:	"\n"
//usage:	"Parameters: (* = takes an argument, ^ = can be turned off by preceding ^)\n"
//usage:	"	*port, *irq, *divisor, *uart, *baud_base, *close_delay, *closing_wait,\n"
//usage:	"	^fourport, ^auto_irq, ^skip_test, ^sak, ^session_lockout, ^pgrp_lockout,\n"
//usage:	"	^callout_nohup, ^split_termios, ^hup_notify, ^low_latency, autoconfig,\n"
//usage:	"	spd_normal, spd_hi, spd_vhi, spd_shi, spd_warp, spd_cust\n"
//usage:	"\n"
//usage:	"UART types:\n"
//usage:	"	unknown, 8250, 16450, 16550, 16550A, Cirrus, 16650, 16650V2, 16750,\n"
//usage:	"	16950, 16954, 16654, 16850, RSA, NS16550A, XSCALE, RM9000, OCTEON, AR7,\n"
//usage:	"	U6_16550A"

#define OPT_PRINT_SUMMARY       (1 << 0)
#define OPT_PRINT_FEDBACK       (1 << 1)
#define OPT_PRINT_ALL           (1 << 2)
#define OPT_VERBOSE             (1 << 3)
#define OPT_ZERO                (1 << 4)
#define OPT_GET                 (1 << 5)

#define OPT_MODE_MASK \
	(OPT_PRINT_ALL | OPT_PRINT_SUMMARY | OPT_PRINT_FEDBACK)

enum print_mode
{
	PRINT_NORMAL  = 0,
	PRINT_SUMMARY = (1 << 0),
	PRINT_FEDBACK = (1 << 1),
	PRINT_ALL     = (1 << 2),
};

#define CTL_SET                 (1 << 0)
#define CTL_CONFIG              (1 << 1)
#define CTL_GET                 (1 << 2)
#define CTL_CLOSE               (1 << 3)
#define CTL_NODIE               (1 << 4)

static const char serial_types[] ALIGN1 =
	"unknown\0"		/* 0 */
	"8250\0"		/* 1 */
	"16450\0"		/* 2 */
	"16550\0"		/* 3 */
	"16550A\0"		/* 4 */
	"Cirrus\0"		/* 5 */
	"16650\0"		/* 6 */
	"16650V2\0"		/* 7 */
	"16750\0"		/* 8 */
	"16950\0"		/* 9 UNIMPLEMENTED: also know as "16950/954" */
	"16954\0"		/* 10 */
	"16654\0"		/* 11 */
	"16850\0"		/* 12 */
	"RSA\0"			/* 13 */
#ifndef SETSERIAL_BASE
	"NS16550A\0"		/* 14 */
	"XSCALE\0"		/* 15 */
	"RM9000\0"		/* 16 */
	"OCTEON\0"		/* 17 */
	"AR7\0"			/* 18 */
	"U6_16550A\0"		/* 19 */
#endif
;

#ifndef SETSERIAL_BASE
# define MAX_SERIAL_TYPE	19
#else
# define MAX_SERIAL_TYPE	13
#endif

static const char commands[] ALIGN1 =
	"spd_normal\0"
	"spd_hi\0"
	"spd_vhi\0"
	"spd_shi\0"
	"spd_warp\0"
	"spd_cust\0"

	"sak\0"
	"fourport\0"
	"hup_notify\0"
	"skip_test\0"
	"auto_irq\0"
	"split_termios\0"
	"session_lockout\0"
	"pgrp_lockout\0"
	"callout_nohup\0"
	"low_latency\0"

	"port\0"
	"irq\0"
	"divisor\0"
	"uart\0"
	"baud_base\0"
	"close_delay\0"
	"closing_wait\0"

	"autoconfig\0"
;

enum
{
	CMD_SPD_NORMAL = 0,
	CMD_SPD_HI,
	CMD_SPD_VHI,
	CMD_SPD_SHI,
	CMD_SPD_WARP,
	CMD_SPD_CUST,

	CMD_FLAG_SAK,
	CMD_FLAG_FOURPORT,
	CMD_FLAG_NUP_NOTIFY,
	CMD_FLAG_SKIP_TEST,
	CMD_FLAG_AUTO_IRQ,
	CMD_FLAG_SPLIT_TERMIOS,
	CMD_FLAG_SESSION_LOCKOUT,
	CMD_FLAG_PGRP_LOCKOUT,
	CMD_FLAG_CALLOUT_NOHUP,
	CMD_FLAG_LOW_LATENCY,

	CMD_PORT,
	CMD_IRQ,
	CMD_DIVISOR,
	CMD_UART,
	CMD_BASE,
	CMD_DELAY,
	CMD_WAIT,

	CMD_AUTOCONFIG,

	CMD_FLAG_FIRST = CMD_FLAG_SAK,
	CMD_FLAG_LAST  = CMD_FLAG_LOW_LATENCY,
};

static bool cmd_noprint(int cmd)
{
	return (cmd >= CMD_FLAG_SKIP_TEST && cmd <= CMD_FLAG_CALLOUT_NOHUP);
}

static bool cmd_is_flag(int cmd)
{
	return (cmd >= CMD_FLAG_FIRST && cmd <= CMD_FLAG_LAST);
}

static bool cmd_need_arg(int cmd)
{
	return (cmd >= CMD_PORT && cmd <= CMD_WAIT);
}

#define ALL_SPD ( \
	ASYNC_SPD_HI | ASYNC_SPD_VHI | ASYNC_SPD_SHI | \
	ASYNC_SPD_WARP | ASYNC_SPD_CUST \
	)

#define ALL_FLAGS ( \
	ASYNC_SAK | ASYNC_FOURPORT | ASYNC_HUP_NOTIFY | \
	ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ | ASYNC_SPLIT_TERMIOS | \
	ASYNC_SESSION_LOCKOUT | ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP | \
	ASYNC_LOW_LATENCY \
	)

#if (ALL_SPD | ALL_FLAGS) > 0xffff
# error "Unexpected flags size"
#endif

static const uint16_t setbits[CMD_FLAG_LAST + 1] =
{
	0,
	ASYNC_SPD_HI,
	ASYNC_SPD_VHI,
	ASYNC_SPD_SHI,
	ASYNC_SPD_WARP,
	ASYNC_SPD_CUST,

	ASYNC_SAK,
	ASYNC_FOURPORT,
	ASYNC_HUP_NOTIFY,
	ASYNC_SKIP_TEST,
	ASYNC_AUTO_IRQ,
	ASYNC_SPLIT_TERMIOS,
	ASYNC_SESSION_LOCKOUT,
	ASYNC_PGRP_LOCKOUT,
	ASYNC_CALLOUT_NOHUP,
	ASYNC_LOW_LATENCY
};

#define STR_INFINITE "infinite"
#define STR_NONE     "none"

static const char *uart_type(int type)
{
	if (type > MAX_SERIAL_TYPE)
		return "undefined";

	return nth_string(serial_types, type);
}

/* libbb candidate */
static int index_in_strings_case_insensitive(const char *strings, const char *key)
{
	int idx = 0;

	while (*strings) {
		if (strcasecmp(strings, key) == 0) {
			return idx;
		}
		strings += strlen(strings) + 1; /* skip NUL */
		idx++;
	}
	return -1;
}

static int uart_id(const char *name)
{
	return index_in_strings_case_insensitive(serial_types, name);
}

static const char *get_spd(int flags, enum print_mode mode)
{
	int idx;

	switch (flags & ASYNC_SPD_MASK) {
	case ASYNC_SPD_HI:
		idx = CMD_SPD_HI;
		break;
	case ASYNC_SPD_VHI:
		idx = CMD_SPD_VHI;
		break;
	case ASYNC_SPD_SHI:
		idx = CMD_SPD_SHI;
		break;
	case ASYNC_SPD_WARP:
		idx = CMD_SPD_WARP;
		break;
	case ASYNC_SPD_CUST:
		idx = CMD_SPD_CUST;
		break;
	default:
		if (mode < PRINT_FEDBACK)
			return NULL;
		idx = CMD_SPD_NORMAL;
	}

	return nth_string(commands, idx);
}

static int get_numeric(const char *arg)
{
	return bb_strtol(arg, NULL, 0);
}

static int get_wait(const char *arg)
{
	if (strcasecmp(arg, STR_NONE) == 0)
		return ASYNC_CLOSING_WAIT_NONE;

	if (strcasecmp(arg, STR_INFINITE) == 0)
		return ASYNC_CLOSING_WAIT_INF;

	return get_numeric(arg);
}

static int get_uart(const char *arg)
{
	int uart = uart_id(arg);

	if (uart < 0)
		bb_error_msg_and_die("illegal UART type: %s", arg);

	return uart;
}

static int serial_open(const char *dev, bool quiet)
{
	int fd;

	fd = device_open(dev, O_RDWR | O_NONBLOCK);
	if (fd < 0 && !quiet)
		bb_simple_perror_msg(dev);

	return fd;
}

static int serial_ctl(int fd, int ops, struct serial_struct *serinfo)
{
	int ret = 0;
	const char *err;

	if (ops & CTL_SET) {
		ret = ioctl(fd, TIOCSSERIAL, serinfo);
		if (ret < 0) {
			err = "can't set serial info";
			goto fail;
		}
	}

	if (ops & CTL_CONFIG) {
		ret = ioctl(fd, TIOCSERCONFIG);
		if (ret < 0) {
			err = "can't autoconfigure port";
			goto fail;
		}
	}

	if (ops & CTL_GET) {
		ret = ioctl(fd, TIOCGSERIAL, serinfo);
		if (ret < 0) {
			err = "can't get serial info";
			goto fail;
		}
	}
 nodie:
	if (ops & CTL_CLOSE)
		close(fd);

	return ret;
 fail:
	bb_simple_perror_msg(err);
	if (ops & CTL_NODIE)
		goto nodie;
	exit(EXIT_FAILURE);
}

static void print_flag(const char **prefix, const char *flag)
{
	printf("%s%s", *prefix, flag);
	*prefix = " ";
}

static void print_serial_flags(int serial_flags, enum print_mode mode,
				const char *prefix, const char *postfix)
{
	int i;
	const char *spd, *pr;

	pr = prefix;

	spd = get_spd(serial_flags, mode);
	if (spd)
		print_flag(&pr, spd);

	for (i = CMD_FLAG_FIRST; i <= CMD_FLAG_LAST; i++) {
		if ((serial_flags & setbits[i])
		 && (mode > PRINT_SUMMARY || !cmd_noprint(i))
		) {
			print_flag(&pr, nth_string(commands, i));
		}
	}

	puts(pr == prefix ? "" : postfix);
}

static void print_closing_wait(unsigned int closing_wait)
{
	switch (closing_wait) {
	case ASYNC_CLOSING_WAIT_NONE:
		puts(STR_NONE);
		break;
	case ASYNC_CLOSING_WAIT_INF:
		puts(STR_INFINITE);
		break;
	default:
		printf("%u\n", closing_wait);
	}
}

static void serial_get(const char *device, enum print_mode mode)
{
	int fd, ret;
	const char *uart, *prefix, *postfix;
	struct serial_struct serinfo;

	fd = serial_open(device, /*quiet:*/ mode == PRINT_SUMMARY);
	if (fd < 0)
		return;

	ret = serial_ctl(fd, CTL_GET | CTL_CLOSE | CTL_NODIE, &serinfo);
	if (ret < 0)
		return;

	uart = uart_type(serinfo.type);
	prefix = ", Flags: ";
	postfix = "";

	switch (mode) {
	case PRINT_NORMAL:
		printf("%s, UART: %s, Port: 0x%.4x, IRQ: %d",
			device, uart, serinfo.port, serinfo.irq);
		break;
	case PRINT_SUMMARY:
		if (!serinfo.type)
			return;
		printf("%s at 0x%.4x (irq = %d) is a %s",
			device, serinfo.port, serinfo.irq, uart);
		prefix = " (";
		postfix = ")";
		break;
	case PRINT_FEDBACK:
		printf("%s uart %s port 0x%.4x irq %d baud_base %d", device,
			uart, serinfo.port, serinfo.irq, serinfo.baud_base);
		prefix = " ";
		break;
	case PRINT_ALL:
		printf("%s, Line %d, UART: %s, Port: 0x%.4x, IRQ: %d\n",
			device, serinfo.line, uart, serinfo.port, serinfo.irq);
		printf("\tBaud_base: %d, close_delay: %u, divisor: %d\n",
			serinfo.baud_base, serinfo.close_delay,
			serinfo.custom_divisor);
		printf("\tclosing_wait: ");
		print_closing_wait(serinfo.closing_wait);
		prefix = "\tFlags: ";
		postfix = "\n";
		break;
	default:
		assert(0);
	}

	print_serial_flags(serinfo.flags, mode, prefix, postfix);
}

static int find_cmd(const char *cmd)
{
	int idx;

	idx = index_in_strings_case_insensitive(commands, cmd);
	if (idx < 0)
		bb_error_msg_and_die("invalid flag: %s", cmd);

	return idx;
}

static void serial_set(char **arg, int opts)
{
	struct serial_struct serinfo;
	int cmd;
	const char *word;
	int fd;

	fd = serial_open(*arg++, /*quiet:*/ false);
	if (fd < 0)
		exit(201);

	serial_ctl(fd, CTL_GET, &serinfo);

	if (opts & OPT_ZERO)
		serinfo.flags = 0;

	while (*arg) {
		int invert;

		word = *arg++;
		invert = (*word == '^');
		word += invert;

		cmd = find_cmd(word);

		if (*arg == NULL && cmd_need_arg(cmd))
			bb_error_msg_and_die(bb_msg_requires_arg, word);

		if (invert && !cmd_is_flag(cmd))
			bb_error_msg_and_die("can't invert %s", word);

		switch (cmd) {
		case CMD_SPD_NORMAL:
		case CMD_SPD_HI:
		case CMD_SPD_VHI:
		case CMD_SPD_SHI:
		case CMD_SPD_WARP:
		case CMD_SPD_CUST:
			serinfo.flags &= ~ASYNC_SPD_MASK;
			/* fallthrough */
		case CMD_FLAG_SAK:
		case CMD_FLAG_FOURPORT:
		case CMD_FLAG_NUP_NOTIFY:
		case CMD_FLAG_SKIP_TEST:
		case CMD_FLAG_AUTO_IRQ:
		case CMD_FLAG_SPLIT_TERMIOS:
		case CMD_FLAG_SESSION_LOCKOUT:
		case CMD_FLAG_PGRP_LOCKOUT:
		case CMD_FLAG_CALLOUT_NOHUP:
		case CMD_FLAG_LOW_LATENCY:
			if (invert)
				serinfo.flags &= ~setbits[cmd];
			else
				serinfo.flags |= setbits[cmd];
			break;
		case CMD_PORT:
			serinfo.port = get_numeric(*arg++);
			break;
		case CMD_IRQ:
			serinfo.irq = get_numeric(*arg++);
			break;
		case CMD_DIVISOR:
			serinfo.custom_divisor = get_numeric(*arg++);
			break;
		case CMD_UART:
			serinfo.type = get_uart(*arg++);
			break;
		case CMD_BASE:
			serinfo.baud_base = get_numeric(*arg++);
			break;
		case CMD_DELAY:
			serinfo.close_delay = get_numeric(*arg++);
			break;
		case CMD_WAIT:
			serinfo.closing_wait = get_wait(*arg++);
			break;
		case CMD_AUTOCONFIG:
			serial_ctl(fd, CTL_SET | CTL_CONFIG | CTL_GET, &serinfo);
			break;
		default:
			assert(0);
		}
	}

	serial_ctl(fd, CTL_SET | CTL_CLOSE, &serinfo);
}

int setserial_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int setserial_main(int argc UNUSED_PARAM, char **argv)
{
	int opts;

	opt_complementary = "-1:b-aG:G-ab:a-bG";
	opts = getopt32(argv, "bGavzg");
	argv += optind;

	if (!argv[1]) /* one arg only? */
		opts |= OPT_GET;

	if (!(opts & OPT_GET)) {
		serial_set(argv, opts);
		argv[1] = NULL;
	}

	if (opts & (OPT_VERBOSE | OPT_GET)) {
		do {
			serial_get(*argv++, opts & OPT_MODE_MASK);
		} while (*argv);
	}

	return EXIT_SUCCESS;
}