summaryrefslogtreecommitdiffstats
path: root/drivers/usb/serial/f81232.c
blob: 891fb1fe69df739eb20374d41681efef968f9fdf (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
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
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
// SPDX-License-Identifier: GPL-2.0
/*
 * Fintek F81232 USB to serial adaptor driver
 * Fintek F81532A/534A/535/536 USB to 2/4/8/12 serial adaptor driver
 *
 * Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
 * Copyright (C) 2012 Linux Foundation
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/serial_reg.h>

#define F81232_ID		\
	{ USB_DEVICE(0x1934, 0x0706) }	/* 1 port UART device */

#define F81534A_SERIES_ID	\
	{ USB_DEVICE(0x2c42, 0x1602) },	/* In-Box 2 port UART device */	\
	{ USB_DEVICE(0x2c42, 0x1604) },	/* In-Box 4 port UART device */	\
	{ USB_DEVICE(0x2c42, 0x1605) },	/* In-Box 8 port UART device */	\
	{ USB_DEVICE(0x2c42, 0x1606) },	/* In-Box 12 port UART device */ \
	{ USB_DEVICE(0x2c42, 0x1608) },	/* Non-Flash type */ \
	{ USB_DEVICE(0x2c42, 0x1632) },	/* 2 port UART device */ \
	{ USB_DEVICE(0x2c42, 0x1634) },	/* 4 port UART device */ \
	{ USB_DEVICE(0x2c42, 0x1635) },	/* 8 port UART device */ \
	{ USB_DEVICE(0x2c42, 0x1636) }	/* 12 port UART device */

#define F81534A_CTRL_ID		\
	{ USB_DEVICE(0x2c42, 0x16f8) }	/* Global control device */

static const struct usb_device_id f81232_id_table[] = {
	F81232_ID,
	{ }					/* Terminating entry */
};

static const struct usb_device_id f81534a_id_table[] = {
	F81534A_SERIES_ID,
	{ }					/* Terminating entry */
};

static const struct usb_device_id f81534a_ctrl_id_table[] = {
	F81534A_CTRL_ID,
	{ }					/* Terminating entry */
};

static const struct usb_device_id combined_id_table[] = {
	F81232_ID,
	F81534A_SERIES_ID,
	F81534A_CTRL_ID,
	{ }					/* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, combined_id_table);

/* Maximum baudrate for F81232 */
#define F81232_MAX_BAUDRATE		1500000
#define F81232_DEF_BAUDRATE		9600

/* USB Control EP parameter */
#define F81232_REGISTER_REQUEST		0xa0
#define F81232_GET_REGISTER		0xc0
#define F81232_SET_REGISTER		0x40
#define F81534A_ACCESS_REG_RETRY	2

#define SERIAL_BASE_ADDRESS		0x0120
#define RECEIVE_BUFFER_REGISTER		(0x00 + SERIAL_BASE_ADDRESS)
#define INTERRUPT_ENABLE_REGISTER	(0x01 + SERIAL_BASE_ADDRESS)
#define FIFO_CONTROL_REGISTER		(0x02 + SERIAL_BASE_ADDRESS)
#define LINE_CONTROL_REGISTER		(0x03 + SERIAL_BASE_ADDRESS)
#define MODEM_CONTROL_REGISTER		(0x04 + SERIAL_BASE_ADDRESS)
#define LINE_STATUS_REGISTER		(0x05 + SERIAL_BASE_ADDRESS)
#define MODEM_STATUS_REGISTER		(0x06 + SERIAL_BASE_ADDRESS)

/*
 * F81232 Clock registers (106h)
 *
 * Bit1-0:	Clock source selector
 *			00: 1.846MHz.
 *			01: 18.46MHz.
 *			10: 24MHz.
 *			11: 14.77MHz.
 */
#define F81232_CLK_REGISTER		0x106
#define F81232_CLK_1_846_MHZ		0
#define F81232_CLK_18_46_MHZ		BIT(0)
#define F81232_CLK_24_MHZ		BIT(1)
#define F81232_CLK_14_77_MHZ		(BIT(1) | BIT(0))
#define F81232_CLK_MASK			GENMASK(1, 0)

#define F81534A_MODE_REG		0x107
#define F81534A_TRIGGER_MASK		GENMASK(3, 2)
#define F81534A_TRIGGER_MULTIPLE_4X	BIT(3)
#define F81534A_FIFO_128BYTE		(BIT(1) | BIT(0))

/* Serial port self GPIO control, 2bytes [control&output data][input data] */
#define F81534A_GPIO_REG		0x10e
#define F81534A_GPIO_MODE2_DIR		BIT(6) /* 1: input, 0: output */
#define F81534A_GPIO_MODE1_DIR		BIT(5)
#define F81534A_GPIO_MODE0_DIR		BIT(4)
#define F81534A_GPIO_MODE2_OUTPUT	BIT(2)
#define F81534A_GPIO_MODE1_OUTPUT	BIT(1)
#define F81534A_GPIO_MODE0_OUTPUT	BIT(0)

#define F81534A_CTRL_CMD_ENABLE_PORT	0x116

struct f81232_private {
	struct mutex lock;
	u8 modem_control;
	u8 modem_status;
	u8 shadow_lcr;
	speed_t baud_base;
	struct work_struct lsr_work;
	struct work_struct interrupt_work;
	struct usb_serial_port *port;
};

static u32 const baudrate_table[] = { 115200, 921600, 1152000, 1500000 };
static u8 const clock_table[] = { F81232_CLK_1_846_MHZ, F81232_CLK_14_77_MHZ,
				F81232_CLK_18_46_MHZ, F81232_CLK_24_MHZ };

static int calc_baud_divisor(speed_t baudrate, speed_t clockrate)
{
	return DIV_ROUND_CLOSEST(clockrate, baudrate);
}

static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
{
	int status;
	struct usb_device *dev = port->serial->dev;

	status = usb_control_msg_recv(dev,
				      0,
				      F81232_REGISTER_REQUEST,
				      F81232_GET_REGISTER,
				      reg,
				      0,
				      val,
				      sizeof(*val),
				      USB_CTRL_GET_TIMEOUT,
				      GFP_KERNEL);
	if (status) {
		dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
		status = usb_translate_errors(status);
	}

	return status;
}

static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
{
	int status;
	struct usb_device *dev = port->serial->dev;

	status = usb_control_msg_send(dev,
				      0,
				      F81232_REGISTER_REQUEST,
				      F81232_SET_REGISTER,
				      reg,
				      0,
				      &val,
				      sizeof(val),
				      USB_CTRL_SET_TIMEOUT,
				      GFP_KERNEL);
	if (status) {
		dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
		status = usb_translate_errors(status);
	}

	return status;
}

static int f81232_set_mask_register(struct usb_serial_port *port, u16 reg,
					u8 mask, u8 val)
{
	int status;
	u8 tmp;

	status = f81232_get_register(port, reg, &tmp);
	if (status)
		return status;

	tmp = (tmp & ~mask) | (val & mask);

	return f81232_set_register(port, reg, tmp);
}

static void f81232_read_msr(struct usb_serial_port *port)
{
	int status;
	u8 current_msr;
	struct tty_struct *tty;
	struct f81232_private *priv = usb_get_serial_port_data(port);

	mutex_lock(&priv->lock);
	status = f81232_get_register(port, MODEM_STATUS_REGISTER,
			&current_msr);
	if (status) {
		dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
		mutex_unlock(&priv->lock);
		return;
	}

	if (!(current_msr & UART_MSR_ANY_DELTA)) {
		mutex_unlock(&priv->lock);
		return;
	}

	priv->modem_status = current_msr;

	if (current_msr & UART_MSR_DCTS)
		port->icount.cts++;
	if (current_msr & UART_MSR_DDSR)
		port->icount.dsr++;
	if (current_msr & UART_MSR_TERI)
		port->icount.rng++;
	if (current_msr & UART_MSR_DDCD) {
		port->icount.dcd++;
		tty = tty_port_tty_get(&port->port);
		if (tty) {
			usb_serial_handle_dcd_change(port, tty,
					current_msr & UART_MSR_DCD);

			tty_kref_put(tty);
		}
	}

	wake_up_interruptible(&port->port.delta_msr_wait);
	mutex_unlock(&priv->lock);
}

static int f81232_set_mctrl(struct usb_serial_port *port,
					   unsigned int set, unsigned int clear)
{
	u8 val;
	int status;
	struct f81232_private *priv = usb_get_serial_port_data(port);

	if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0)
		return 0;	/* no change */

	/* 'set' takes precedence over 'clear' */
	clear &= ~set;

	/* force enable interrupt with OUT2 */
	mutex_lock(&priv->lock);
	val = UART_MCR_OUT2 | priv->modem_control;

	if (clear & TIOCM_DTR)
		val &= ~UART_MCR_DTR;

	if (clear & TIOCM_RTS)
		val &= ~UART_MCR_RTS;

	if (set & TIOCM_DTR)
		val |= UART_MCR_DTR;

	if (set & TIOCM_RTS)
		val |= UART_MCR_RTS;

	dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__,
			val, priv->modem_control);

	status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val);
	if (status) {
		dev_err(&port->dev, "%s set MCR status < 0\n", __func__);
		mutex_unlock(&priv->lock);
		return status;
	}

	priv->modem_control = val;
	mutex_unlock(&priv->lock);

	return 0;
}

static void f81232_update_line_status(struct usb_serial_port *port,
				      unsigned char *data,
				      size_t actual_length)
{
	struct f81232_private *priv = usb_get_serial_port_data(port);

	if (!actual_length)
		return;

	switch (data[0] & 0x07) {
	case 0x00: /* msr change */
		dev_dbg(&port->dev, "IIR: MSR Change: %02x\n", data[0]);
		schedule_work(&priv->interrupt_work);
		break;
	case 0x02: /* tx-empty */
		break;
	case 0x04: /* rx data available */
		break;
	case 0x06: /* lsr change */
		/* we can forget it. the LSR will read from bulk-in */
		dev_dbg(&port->dev, "IIR: LSR Change: %02x\n", data[0]);
		break;
	}
}

static void f81232_read_int_callback(struct urb *urb)
{
	struct usb_serial_port *port =  urb->context;
	unsigned char *data = urb->transfer_buffer;
	unsigned int actual_length = urb->actual_length;
	int status = urb->status;
	int retval;

	switch (status) {
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
		dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
			__func__, status);
		return;
	default:
		dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
			__func__, status);
		goto exit;
	}

	usb_serial_debug_data(&port->dev, __func__,
			      urb->actual_length, urb->transfer_buffer);

	f81232_update_line_status(port, data, actual_length);

exit:
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
		dev_err(&urb->dev->dev,
			"%s - usb_submit_urb failed with result %d\n",
			__func__, retval);
}

static char f81232_handle_lsr(struct usb_serial_port *port, u8 lsr)
{
	struct f81232_private *priv = usb_get_serial_port_data(port);
	char tty_flag = TTY_NORMAL;

	if (!(lsr & UART_LSR_BRK_ERROR_BITS))
		return tty_flag;

	if (lsr & UART_LSR_BI) {
		tty_flag = TTY_BREAK;
		port->icount.brk++;
		usb_serial_handle_break(port);
	} else if (lsr & UART_LSR_PE) {
		tty_flag = TTY_PARITY;
		port->icount.parity++;
	} else if (lsr & UART_LSR_FE) {
		tty_flag = TTY_FRAME;
		port->icount.frame++;
	}

	if (lsr & UART_LSR_OE) {
		port->icount.overrun++;
		schedule_work(&priv->lsr_work);
		tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
	}

	return tty_flag;
}

static void f81232_process_read_urb(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	unsigned char *data = urb->transfer_buffer;
	char tty_flag;
	unsigned int i;
	u8 lsr;

	/*
	 * When opening the port we get a 1-byte packet with the current LSR,
	 * which we discard.
	 */
	if ((urb->actual_length < 2) || (urb->actual_length % 2))
		return;

	/* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */

	for (i = 0; i < urb->actual_length; i += 2) {
		lsr = data[i];
		tty_flag = f81232_handle_lsr(port, lsr);

		if (port->sysrq) {
			if (usb_serial_handle_sysrq_char(port, data[i + 1]))
				continue;
		}

		tty_insert_flip_char(&port->port, data[i + 1], tty_flag);
	}

	tty_flip_buffer_push(&port->port);
}

static void f81534a_process_read_urb(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	unsigned char *data = urb->transfer_buffer;
	char tty_flag;
	unsigned int i;
	u8 lsr;
	u8 len;

	if (urb->actual_length < 3) {
		dev_err(&port->dev, "short message received: %d\n",
				urb->actual_length);
		return;
	}

	len = data[0];
	if (len != urb->actual_length) {
		dev_err(&port->dev, "malformed message received: %d (%d)\n",
				urb->actual_length, len);
		return;
	}

	/* bulk-in data: [LEN][Data.....][LSR] */
	lsr = data[len - 1];
	tty_flag = f81232_handle_lsr(port, lsr);

	if (port->sysrq) {
		for (i = 1; i < len - 1; ++i) {
			if (!usb_serial_handle_sysrq_char(port, data[i])) {
				tty_insert_flip_char(&port->port, data[i],
						tty_flag);
			}
		}
	} else {
		tty_insert_flip_string_fixed_flag(&port->port, &data[1],
							tty_flag, len - 2);
	}

	tty_flip_buffer_push(&port->port);
}

static void f81232_break_ctl(struct tty_struct *tty, int break_state)
{
	struct usb_serial_port *port = tty->driver_data;
	struct f81232_private *priv = usb_get_serial_port_data(port);
	int status;

	mutex_lock(&priv->lock);

	if (break_state)
		priv->shadow_lcr |= UART_LCR_SBC;
	else
		priv->shadow_lcr &= ~UART_LCR_SBC;

	status = f81232_set_register(port, LINE_CONTROL_REGISTER,
					priv->shadow_lcr);
	if (status)
		dev_err(&port->dev, "set break failed: %d\n", status);

	mutex_unlock(&priv->lock);
}

static int f81232_find_clk(speed_t baudrate)
{
	int idx;

	for (idx = 0; idx < ARRAY_SIZE(baudrate_table); ++idx) {
		if (baudrate <= baudrate_table[idx] &&
				baudrate_table[idx] % baudrate == 0)
			return idx;
	}

	return -EINVAL;
}

static void f81232_set_baudrate(struct tty_struct *tty,
				struct usb_serial_port *port, speed_t baudrate,
				speed_t old_baudrate)
{
	struct f81232_private *priv = usb_get_serial_port_data(port);
	u8 lcr;
	int divisor;
	int status = 0;
	int i;
	int idx;
	speed_t baud_list[] = { baudrate, old_baudrate, F81232_DEF_BAUDRATE };

	for (i = 0; i < ARRAY_SIZE(baud_list); ++i) {
		baudrate = baud_list[i];
		if (baudrate == 0) {
			tty_encode_baud_rate(tty, 0, 0);
			return;
		}

		idx = f81232_find_clk(baudrate);
		if (idx >= 0) {
			tty_encode_baud_rate(tty, baudrate, baudrate);
			break;
		}
	}

	if (idx < 0)
		return;

	priv->baud_base = baudrate_table[idx];
	divisor = calc_baud_divisor(baudrate, priv->baud_base);

	status = f81232_set_mask_register(port, F81232_CLK_REGISTER,
			F81232_CLK_MASK, clock_table[idx]);
	if (status) {
		dev_err(&port->dev, "%s failed to set CLK_REG: %d\n",
			__func__, status);
		return;
	}

	status = f81232_get_register(port, LINE_CONTROL_REGISTER,
			 &lcr); /* get LCR */
	if (status) {
		dev_err(&port->dev, "%s failed to get LCR: %d\n",
			__func__, status);
		return;
	}

	status = f81232_set_register(port, LINE_CONTROL_REGISTER,
			 lcr | UART_LCR_DLAB); /* Enable DLAB */
	if (status) {
		dev_err(&port->dev, "%s failed to set DLAB: %d\n",
			__func__, status);
		return;
	}

	status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER,
			 divisor & 0x00ff); /* low */
	if (status) {
		dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n",
			__func__, status);
		goto reapply_lcr;
	}

	status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
			 (divisor & 0xff00) >> 8); /* high */
	if (status) {
		dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n",
			__func__, status);
	}

reapply_lcr:
	status = f81232_set_register(port, LINE_CONTROL_REGISTER,
			lcr & ~UART_LCR_DLAB);
	if (status) {
		dev_err(&port->dev, "%s failed to set DLAB: %d\n",
			__func__, status);
	}
}

static int f81232_port_enable(struct usb_serial_port *port)
{
	u8 val;
	int status;

	/* fifo on, trigger8, clear TX/RX*/
	val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
			UART_FCR_CLEAR_XMIT;

	status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
	if (status) {
		dev_err(&port->dev, "%s failed to set FCR: %d\n",
			__func__, status);
		return status;
	}

	/* MSR Interrupt only, LSR will read from Bulk-in odd byte */
	status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
			UART_IER_MSI);
	if (status) {
		dev_err(&port->dev, "%s failed to set IER: %d\n",
			__func__, status);
		return status;
	}

	return 0;
}

static int f81232_port_disable(struct usb_serial_port *port)
{
	int status;

	status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
	if (status) {
		dev_err(&port->dev, "%s failed to set IER: %d\n",
			__func__, status);
		return status;
	}

	return 0;
}

static void f81232_set_termios(struct tty_struct *tty,
			       struct usb_serial_port *port,
			       const struct ktermios *old_termios)
{
	struct f81232_private *priv = usb_get_serial_port_data(port);
	u8 new_lcr = 0;
	int status = 0;
	speed_t baudrate;
	speed_t old_baud;

	/* Don't change anything if nothing has changed */
	if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
		return;

	if (C_BAUD(tty) == B0)
		f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
	else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
		f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);

	baudrate = tty_get_baud_rate(tty);
	if (baudrate > 0) {
		if (old_termios)
			old_baud = tty_termios_baud_rate(old_termios);
		else
			old_baud = F81232_DEF_BAUDRATE;

		f81232_set_baudrate(tty, port, baudrate, old_baud);
	}

	if (C_PARENB(tty)) {
		new_lcr |= UART_LCR_PARITY;

		if (!C_PARODD(tty))
			new_lcr |= UART_LCR_EPAR;

		if (C_CMSPAR(tty))
			new_lcr |= UART_LCR_SPAR;
	}

	if (C_CSTOPB(tty))
		new_lcr |= UART_LCR_STOP;

	new_lcr |= UART_LCR_WLEN(tty_get_char_size(tty->termios.c_cflag));

	mutex_lock(&priv->lock);

	new_lcr |= (priv->shadow_lcr & UART_LCR_SBC);
	status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
	if (status) {
		dev_err(&port->dev, "%s failed to set LCR: %d\n",
			__func__, status);
	}

	priv->shadow_lcr = new_lcr;

	mutex_unlock(&priv->lock);
}

static int f81232_tiocmget(struct tty_struct *tty)
{
	int r;
	struct usb_serial_port *port = tty->driver_data;
	struct f81232_private *port_priv = usb_get_serial_port_data(port);
	u8 mcr, msr;

	/* force get current MSR changed state */
	f81232_read_msr(port);

	mutex_lock(&port_priv->lock);
	mcr = port_priv->modem_control;
	msr = port_priv->modem_status;
	mutex_unlock(&port_priv->lock);

	r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) |
		(mcr & UART_MCR_RTS ? TIOCM_RTS : 0) |
		(msr & UART_MSR_CTS ? TIOCM_CTS : 0) |
		(msr & UART_MSR_DCD ? TIOCM_CAR : 0) |
		(msr & UART_MSR_RI ? TIOCM_RI : 0) |
		(msr & UART_MSR_DSR ? TIOCM_DSR : 0);

	return r;
}

static int f81232_tiocmset(struct tty_struct *tty,
			unsigned int set, unsigned int clear)
{
	struct usb_serial_port *port = tty->driver_data;

	return f81232_set_mctrl(port, set, clear);
}

static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
{
	int result;

	result = f81232_port_enable(port);
	if (result)
		return result;

	/* Setup termios */
	if (tty)
		f81232_set_termios(tty, port, NULL);

	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
	if (result) {
		dev_err(&port->dev, "%s - failed submitting interrupt urb,"
			" error %d\n", __func__, result);
		return result;
	}

	result = usb_serial_generic_open(tty, port);
	if (result) {
		usb_kill_urb(port->interrupt_in_urb);
		return result;
	}

	return 0;
}

static int f81534a_open(struct tty_struct *tty, struct usb_serial_port *port)
{
	int status;
	u8 mask;
	u8 val;

	val = F81534A_TRIGGER_MULTIPLE_4X | F81534A_FIFO_128BYTE;
	mask = F81534A_TRIGGER_MASK | F81534A_FIFO_128BYTE;

	status = f81232_set_mask_register(port, F81534A_MODE_REG, mask, val);
	if (status) {
		dev_err(&port->dev, "failed to set MODE_REG: %d\n", status);
		return status;
	}

	return f81232_open(tty, port);
}

static void f81232_close(struct usb_serial_port *port)
{
	struct f81232_private *port_priv = usb_get_serial_port_data(port);

	f81232_port_disable(port);
	usb_serial_generic_close(port);
	usb_kill_urb(port->interrupt_in_urb);
	flush_work(&port_priv->interrupt_work);
	flush_work(&port_priv->lsr_work);
}

static void f81232_dtr_rts(struct usb_serial_port *port, int on)
{
	if (on)
		f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
	else
		f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
}

static bool f81232_tx_empty(struct usb_serial_port *port)
{
	int status;
	u8 tmp;

	status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp);
	if (!status) {
		if ((tmp & UART_LSR_TEMT) != UART_LSR_TEMT)
			return false;
	}

	return true;
}

static int f81232_carrier_raised(struct usb_serial_port *port)
{
	u8 msr;
	struct f81232_private *priv = usb_get_serial_port_data(port);

	mutex_lock(&priv->lock);
	msr = priv->modem_status;
	mutex_unlock(&priv->lock);

	if (msr & UART_MSR_DCD)
		return 1;
	return 0;
}

static void f81232_get_serial(struct tty_struct *tty, struct serial_struct *ss)
{
	struct usb_serial_port *port = tty->driver_data;
	struct f81232_private *priv = usb_get_serial_port_data(port);

	ss->baud_base = priv->baud_base;
}

static void  f81232_interrupt_work(struct work_struct *work)
{
	struct f81232_private *priv =
		container_of(work, struct f81232_private, interrupt_work);

	f81232_read_msr(priv->port);
}

static void f81232_lsr_worker(struct work_struct *work)
{
	struct f81232_private *priv;
	struct usb_serial_port *port;
	int status;
	u8 tmp;

	priv = container_of(work, struct f81232_private, lsr_work);
	port = priv->port;

	status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp);
	if (status)
		dev_warn(&port->dev, "read LSR failed: %d\n", status);
}

static int f81534a_ctrl_set_register(struct usb_interface *intf, u16 reg,
					u16 size, void *val)
{
	struct usb_device *dev = interface_to_usbdev(intf);
	int retry = F81534A_ACCESS_REG_RETRY;
	int status;

	while (retry--) {
		status = usb_control_msg_send(dev,
					      0,
					      F81232_REGISTER_REQUEST,
					      F81232_SET_REGISTER,
					      reg,
					      0,
					      val,
					      size,
					      USB_CTRL_SET_TIMEOUT,
					      GFP_KERNEL);
		if (status) {
			status = usb_translate_errors(status);
			if (status == -EIO)
				continue;
		}

		break;
	}

	if (status) {
		dev_err(&intf->dev, "failed to set register 0x%x: %d\n",
				reg, status);
	}

	return status;
}

static int f81534a_ctrl_enable_all_ports(struct usb_interface *intf, bool en)
{
	unsigned char enable[2] = {0};
	int status;

	/*
	 * Enable all available serial ports, define as following:
	 * bit 15	: Reset behavior (when HUB got soft reset)
	 *			0: maintain all serial port enabled state.
	 *			1: disable all serial port.
	 * bit 0~11	: Serial port enable bit.
	 */
	if (en) {
		enable[0] = 0xff;
		enable[1] = 0x8f;
	}

	status = f81534a_ctrl_set_register(intf, F81534A_CTRL_CMD_ENABLE_PORT,
			sizeof(enable), enable);
	if (status)
		dev_err(&intf->dev, "failed to enable ports: %d\n", status);

	return status;
}

static int f81534a_ctrl_probe(struct usb_interface *intf,
				const struct usb_device_id *id)
{
	return f81534a_ctrl_enable_all_ports(intf, true);
}

static void f81534a_ctrl_disconnect(struct usb_interface *intf)
{
	f81534a_ctrl_enable_all_ports(intf, false);
}

static int f81534a_ctrl_resume(struct usb_interface *intf)
{
	return f81534a_ctrl_enable_all_ports(intf, true);
}

static int f81232_port_probe(struct usb_serial_port *port)
{
	struct f81232_private *priv;

	priv = devm_kzalloc(&port->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	mutex_init(&priv->lock);
	INIT_WORK(&priv->interrupt_work,  f81232_interrupt_work);
	INIT_WORK(&priv->lsr_work, f81232_lsr_worker);

	usb_set_serial_port_data(port, priv);

	priv->port = port;

	return 0;
}

static int f81534a_port_probe(struct usb_serial_port *port)
{
	int status;

	/* tri-state with pull-high, default RS232 Mode */
	status = f81232_set_register(port, F81534A_GPIO_REG,
					F81534A_GPIO_MODE2_DIR);
	if (status)
		return status;

	return f81232_port_probe(port);
}

static int f81232_suspend(struct usb_serial *serial, pm_message_t message)
{
	struct usb_serial_port *port = serial->port[0];
	struct f81232_private *port_priv = usb_get_serial_port_data(port);
	int i;

	for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
		usb_kill_urb(port->read_urbs[i]);

	usb_kill_urb(port->interrupt_in_urb);

	if (port_priv) {
		flush_work(&port_priv->interrupt_work);
		flush_work(&port_priv->lsr_work);
	}

	return 0;
}

static int f81232_resume(struct usb_serial *serial)
{
	struct usb_serial_port *port = serial->port[0];
	int result;

	if (tty_port_initialized(&port->port)) {
		result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
		if (result) {
			dev_err(&port->dev, "submit interrupt urb failed: %d\n",
					result);
			return result;
		}
	}

	return usb_serial_generic_resume(serial);
}

static struct usb_serial_driver f81232_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"f81232",
	},
	.id_table =		f81232_id_table,
	.num_ports =		1,
	.bulk_in_size =		256,
	.bulk_out_size =	256,
	.open =			f81232_open,
	.close =		f81232_close,
	.dtr_rts =		f81232_dtr_rts,
	.carrier_raised =	f81232_carrier_raised,
	.get_serial =		f81232_get_serial,
	.break_ctl =		f81232_break_ctl,
	.set_termios =		f81232_set_termios,
	.tiocmget =		f81232_tiocmget,
	.tiocmset =		f81232_tiocmset,
	.tiocmiwait =		usb_serial_generic_tiocmiwait,
	.tx_empty =		f81232_tx_empty,
	.process_read_urb =	f81232_process_read_urb,
	.read_int_callback =	f81232_read_int_callback,
	.port_probe =		f81232_port_probe,
	.suspend =		f81232_suspend,
	.resume =		f81232_resume,
};

static struct usb_serial_driver f81534a_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"f81534a",
	},
	.id_table =		f81534a_id_table,
	.num_ports =		1,
	.open =			f81534a_open,
	.close =		f81232_close,
	.dtr_rts =		f81232_dtr_rts,
	.carrier_raised =	f81232_carrier_raised,
	.get_serial =		f81232_get_serial,
	.break_ctl =		f81232_break_ctl,
	.set_termios =		f81232_set_termios,
	.tiocmget =		f81232_tiocmget,
	.tiocmset =		f81232_tiocmset,
	.tiocmiwait =		usb_serial_generic_tiocmiwait,
	.tx_empty =		f81232_tx_empty,
	.process_read_urb =	f81534a_process_read_urb,
	.read_int_callback =	f81232_read_int_callback,
	.port_probe =		f81534a_port_probe,
	.suspend =		f81232_suspend,
	.resume =		f81232_resume,
};

static struct usb_serial_driver * const serial_drivers[] = {
	&f81232_device,
	&f81534a_device,
	NULL,
};

static struct usb_driver f81534a_ctrl_driver = {
	.name =		"f81534a_ctrl",
	.id_table =	f81534a_ctrl_id_table,
	.probe =	f81534a_ctrl_probe,
	.disconnect =	f81534a_ctrl_disconnect,
	.resume =	f81534a_ctrl_resume,
};

static int __init f81232_init(void)
{
	int status;

	status = usb_register_driver(&f81534a_ctrl_driver, THIS_MODULE,
			KBUILD_MODNAME);
	if (status)
		return status;

	status = usb_serial_register_drivers(serial_drivers, KBUILD_MODNAME,
			combined_id_table);
	if (status) {
		usb_deregister(&f81534a_ctrl_driver);
		return status;
	}

	return 0;
}

static void __exit f81232_exit(void)
{
	usb_serial_deregister_drivers(serial_drivers);
	usb_deregister(&f81534a_ctrl_driver);
}

module_init(f81232_init);
module_exit(f81232_exit);

MODULE_DESCRIPTION("Fintek F81232/532A/534A/535/536 USB to serial driver");
MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
MODULE_LICENSE("GPL v2");