summaryrefslogtreecommitdiff
path: root/drivers/input/joystick/gamecon.c
blob: d37645e496ff17838d443699d549e42ec0f5d4c7 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * NES, SNES, N64, MultiSystem, PSX gamepad driver for Linux
 *
 *  Copyright (c) 1999-2004	Vojtech Pavlik <vojtech@suse.cz>
 *  Copyright (c) 2004		Peter Nelson <rufus-kernel@hackish.org>
 *
 *  Based on the work of:
 *	Andree Borrmann		John Dahlstrom
 *	David Kuder		Nathan Hand
 *	Raphael Assenat
 */

/*
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/parport.h>
#include <linux/input.h>
#include <linux/mutex.h>
#include <linux/slab.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("NES, SNES, N64, MultiSystem, PSX gamepad driver");
MODULE_LICENSE("GPL");

#define GC_MAX_PORTS		3
#define GC_MAX_DEVICES		5

struct gc_config {
	int args[GC_MAX_DEVICES + 1];
	unsigned int nargs;
};

static struct gc_config gc_cfg[GC_MAX_PORTS];

module_param_array_named(map, gc_cfg[0].args, int, &gc_cfg[0].nargs, 0);
MODULE_PARM_DESC(map, "Describes first set of devices (<parport#>,<pad1>,<pad2>,..<pad5>)");
module_param_array_named(map2, gc_cfg[1].args, int, &gc_cfg[1].nargs, 0);
MODULE_PARM_DESC(map2, "Describes second set of devices");
module_param_array_named(map3, gc_cfg[2].args, int, &gc_cfg[2].nargs, 0);
MODULE_PARM_DESC(map3, "Describes third set of devices");

/* see also gs_psx_delay parameter in PSX support section */

enum gc_type {
	GC_NONE = 0,
	GC_SNES,
	GC_NES,
	GC_NES4,
	GC_MULTI,
	GC_MULTI2,
	GC_N64,
	GC_PSX,
	GC_DDR,
	GC_SNESMOUSE,
	GC_MAX
};

#define GC_REFRESH_TIME	HZ/100

struct gc_pad {
	struct input_dev *dev;
	enum gc_type type;
	char phys[32];
};

struct gc {
	struct pardevice *pd;
	struct gc_pad pads[GC_MAX_DEVICES];
	struct timer_list timer;
	int pad_count[GC_MAX];
	int used;
	int parportno;
	struct mutex mutex;
};

struct gc_subdev {
	unsigned int idx;
};

static struct gc *gc_base[3];

static const int gc_status_bit[] = { 0x40, 0x80, 0x20, 0x10, 0x08 };

static const char *gc_names[] = {
	NULL, "SNES pad", "NES pad", "NES FourPort", "Multisystem joystick",
	"Multisystem 2-button joystick", "N64 controller", "PSX controller",
	"PSX DDR controller", "SNES mouse"
};

/*
 * N64 support.
 */

static const unsigned char gc_n64_bytes[] = { 0, 1, 13, 15, 14, 12, 10, 11, 2, 3 };
static const short gc_n64_btn[] = {
	BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z,
	BTN_TL, BTN_TR, BTN_TRIGGER, BTN_START
};

#define GC_N64_LENGTH		32		/* N64 bit length, not including stop bit */
#define GC_N64_STOP_LENGTH	5		/* Length of encoded stop bit */
#define GC_N64_CMD_00		0x11111111UL
#define GC_N64_CMD_01		0xd1111111UL
#define GC_N64_CMD_03		0xdd111111UL
#define GC_N64_CMD_1b		0xdd1dd111UL
#define GC_N64_CMD_c0		0x111111ddUL
#define GC_N64_CMD_80		0x1111111dUL
#define GC_N64_STOP_BIT		0x1d		/* Encoded stop bit */
#define GC_N64_REQUEST_DATA	GC_N64_CMD_01	/* the request data command */
#define GC_N64_DELAY		133		/* delay between transmit request, and response ready (us) */
#define GC_N64_DWS		3		/* delay between write segments (required for sound playback because of ISA DMA) */
						/* GC_N64_DWS > 24 is known to fail */
#define GC_N64_POWER_W		0xe2		/* power during write (transmit request) */
#define GC_N64_POWER_R		0xfd		/* power during read */
#define GC_N64_OUT		0x1d		/* output bits to the 4 pads */
						/* Reading the main axes of any N64 pad is known to fail if the corresponding bit */
						/* in GC_N64_OUT is pulled low on the output port (by any routine) for more */
						/* than 123 us */
#define GC_N64_CLOCK		0x02		/* clock bits for read */

/*
 * Used for rumble code.
 */

/* Send encoded command */
static void gc_n64_send_command(struct gc *gc, unsigned long cmd,
				unsigned char target)
{
	struct parport *port = gc->pd->port;
	int i;

	for (i = 0; i < GC_N64_LENGTH; i++) {
		unsigned char data = (cmd >> i) & 1 ? target : 0;
		parport_write_data(port, GC_N64_POWER_W | data);
		udelay(GC_N64_DWS);
	}
}

/* Send stop bit */
static void gc_n64_send_stop_bit(struct gc *gc, unsigned char target)
{
	struct parport *port = gc->pd->port;
	int i;

	for (i = 0; i < GC_N64_STOP_LENGTH; i++) {
		unsigned char data = (GC_N64_STOP_BIT >> i) & 1 ? target : 0;
		parport_write_data(port, GC_N64_POWER_W | data);
		udelay(GC_N64_DWS);
	}
}

/*
 * gc_n64_read_packet() reads an N64 packet.
 * Each pad uses one bit per byte. So all pads connected to this port
 * are read in parallel.
 */

static void gc_n64_read_packet(struct gc *gc, unsigned char *data)
{
	int i;
	unsigned long flags;

/*
 * Request the pad to transmit data
 */

	local_irq_save(flags);
	gc_n64_send_command(gc, GC_N64_REQUEST_DATA, GC_N64_OUT);
	gc_n64_send_stop_bit(gc, GC_N64_OUT);
	local_irq_restore(flags);

/*
 * Wait for the pad response to be loaded into the 33-bit register
 * of the adapter.
 */

	udelay(GC_N64_DELAY);

/*
 * Grab data (ignoring the last bit, which is a stop bit)
 */

	for (i = 0; i < GC_N64_LENGTH; i++) {
		parport_write_data(gc->pd->port, GC_N64_POWER_R);
		udelay(2);
		data[i] = parport_read_status(gc->pd->port);
		parport_write_data(gc->pd->port, GC_N64_POWER_R | GC_N64_CLOCK);
	 }

/*
 * We must wait 200 ms here for the controller to reinitialize before
 * the next read request. No worries as long as gc_read is polled less
 * frequently than this.
 */

}

static void gc_n64_process_packet(struct gc *gc)
{
	unsigned char data[GC_N64_LENGTH];
	struct input_dev *dev;
	int i, j, s;
	signed char x, y;

	gc_n64_read_packet(gc, data);

	for (i = 0; i < GC_MAX_DEVICES; i++) {

		if (gc->pads[i].type != GC_N64)
			continue;

		dev = gc->pads[i].dev;
		s = gc_status_bit[i];

		if (s & ~(data[8] | data[9])) {

			x = y = 0;

			for (j = 0; j < 8; j++) {
				if (data[23 - j] & s)
					x |= 1 << j;
				if (data[31 - j] & s)
					y |= 1 << j;
			}

			input_report_abs(dev, ABS_X,  x);
			input_report_abs(dev, ABS_Y, -y);

			input_report_abs(dev, ABS_HAT0X,
					 !(s & data[6]) - !(s & data[7]));
			input_report_abs(dev, ABS_HAT0Y,
					 !(s & data[4]) - !(s & data[5]));

			for (j = 0; j < 10; j++)
				input_report_key(dev, gc_n64_btn[j],
						 s & data[gc_n64_bytes[j]]);

			input_sync(dev);
		}
	}
}

static int gc_n64_play_effect(struct input_dev *dev, void *data,
			      struct ff_effect *effect)
{
	int i;
	unsigned long flags;
	struct gc *gc = input_get_drvdata(dev);
	struct gc_subdev *sdev = data;
	unsigned char target = 1 << sdev->idx; /* select desired pin */

	if (effect->type == FF_RUMBLE) {
		struct ff_rumble_effect *rumble = &effect->u.rumble;
		unsigned int cmd =
			rumble->strong_magnitude || rumble->weak_magnitude ?
			GC_N64_CMD_01 : GC_N64_CMD_00;

		local_irq_save(flags);

		/* Init Rumble - 0x03, 0x80, 0x01, (34)0x80 */
		gc_n64_send_command(gc, GC_N64_CMD_03, target);
		gc_n64_send_command(gc, GC_N64_CMD_80, target);
		gc_n64_send_command(gc, GC_N64_CMD_01, target);
		for (i = 0; i < 32; i++)
			gc_n64_send_command(gc, GC_N64_CMD_80, target);
		gc_n64_send_stop_bit(gc, target);

		udelay(GC_N64_DELAY);

		/* Now start or stop it - 0x03, 0xc0, 0zx1b, (32)0x01/0x00 */
		gc_n64_send_command(gc, GC_N64_CMD_03, target);
		gc_n64_send_command(gc, GC_N64_CMD_c0, target);
		gc_n64_send_command(gc, GC_N64_CMD_1b, target);
		for (i = 0; i < 32; i++)
			gc_n64_send_command(gc, cmd, target);
		gc_n64_send_stop_bit(gc, target);

		local_irq_restore(flags);

	}

	return 0;
}

static int gc_n64_init_ff(struct input_dev *dev, int i)
{
	struct gc_subdev *sdev;
	int err;

	sdev = kmalloc(sizeof(*sdev), GFP_KERNEL);
	if (!sdev)
		return -ENOMEM;

	sdev->idx = i;

	input_set_capability(dev, EV_FF, FF_RUMBLE);

	err = input_ff_create_memless(dev, sdev, gc_n64_play_effect);
	if (err) {
		kfree(sdev);
		return err;
	}

	return 0;
}

/*
 * NES/SNES support.
 */

#define GC_NES_DELAY		6	/* Delay between bits - 6us */
#define GC_NES_LENGTH		8	/* The NES pads use 8 bits of data */
#define GC_SNES_LENGTH		12	/* The SNES true length is 16, but the
					   last 4 bits are unused */
#define GC_SNESMOUSE_LENGTH	32	/* The SNES mouse uses 32 bits, the first
					   16 bits are equivalent to a gamepad */

#define GC_NES_POWER	0xfc
#define GC_NES_CLOCK	0x01
#define GC_NES_LATCH	0x02

static const unsigned char gc_nes_bytes[] = { 0, 1, 2, 3 };
static const unsigned char gc_snes_bytes[] = { 8, 0, 2, 3, 9, 1, 10, 11 };
static const short gc_snes_btn[] = {
	BTN_A, BTN_B, BTN_SELECT, BTN_START, BTN_X, BTN_Y, BTN_TL, BTN_TR
};

/*
 * gc_nes_read_packet() reads a NES/SNES packet.
 * Each pad uses one bit per byte. So all pads connected to
 * this port are read in parallel.
 */

static void gc_nes_read_packet(struct gc *gc, int length, unsigned char *data)
{
	int i;

	parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK | GC_NES_LATCH);
	udelay(GC_NES_DELAY * 2);
	parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK);

	for (i = 0; i < length; i++) {
		udelay(GC_NES_DELAY);
		parport_write_data(gc->pd->port, GC_NES_POWER);
		data[i] = parport_read_status(gc->pd->port) ^ 0x7f;
		udelay(GC_NES_DELAY);
		parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK);
	}
}

static void gc_nes_process_packet(struct gc *gc)
{
	unsigned char data[GC_SNESMOUSE_LENGTH];
	struct gc_pad *pad;
	struct input_dev *dev;
	int i, j, s, len;
	char x_rel, y_rel;

	len = gc->pad_count[GC_SNESMOUSE] ? GC_SNESMOUSE_LENGTH :
			(gc->pad_count[GC_SNES] ? GC_SNES_LENGTH : GC_NES_LENGTH);

	gc_nes_read_packet(gc, len, data);

	for (i = 0; i < GC_MAX_DEVICES; i++) {

		pad = &gc->pads[i];
		dev = pad->dev;
		s = gc_status_bit[i];

		switch (pad->type) {

		case GC_NES:

			input_report_abs(dev, ABS_X, !(s & data[6]) - !(s & data[7]));
			input_report_abs(dev, ABS_Y, !(s & data[4]) - !(s & data[5]));

			for (j = 0; j < 4; j++)
				input_report_key(dev, gc_snes_btn[j],
						 s & data[gc_nes_bytes[j]]);
			input_sync(dev);
			break;

		case GC_SNES:

			input_report_abs(dev, ABS_X, !(s & data[6]) - !(s & data[7]));
			input_report_abs(dev, ABS_Y, !(s & data[4]) - !(s & data[5]));

			for (j = 0; j < 8; j++)
				input_report_key(dev, gc_snes_btn[j],
						 s & data[gc_snes_bytes[j]]);
			input_sync(dev);
			break;

		case GC_SNESMOUSE:
			/*
			 * The 4 unused bits from SNES controllers appear
			 * to be ID bits so use them to make sure we are
			 * dealing with a mouse.
			 * gamepad is connected. This is important since
			 * my SNES gamepad sends 1's for bits 16-31, which
			 * cause the mouse pointer to quickly move to the
			 * upper left corner of the screen.
			 */
			if (!(s & data[12]) && !(s & data[13]) &&
			    !(s & data[14]) && (s & data[15])) {
				input_report_key(dev, BTN_LEFT, s & data[9]);
				input_report_key(dev, BTN_RIGHT, s & data[8]);

				x_rel = y_rel = 0;
				for (j = 0; j < 7; j++) {
					x_rel <<= 1;
					if (data[25 + j] & s)
						x_rel |= 1;

					y_rel <<= 1;
					if (data[17 + j] & s)
						y_rel |= 1;
				}

				if (x_rel) {
					if (data[24] & s)
						x_rel = -x_rel;
					input_report_rel(dev, REL_X, x_rel);
				}

				if (y_rel) {
					if (data[16] & s)
						y_rel = -y_rel;
					input_report_rel(dev, REL_Y, y_rel);
				}

				input_sync(dev);
			}
			break;

		default:
			break;
		}
	}
}

/*
 * Multisystem joystick support
 */

#define GC_MULTI_LENGTH		5	/* Multi system joystick packet length is 5 */
#define GC_MULTI2_LENGTH	6	/* One more bit for one more button */

/*
 * gc_multi_read_packet() reads a Multisystem joystick packet.
 */

static void gc_multi_read_packet(struct gc *gc, int length, unsigned char *data)
{
	int i;

	for (i = 0; i < length; i++) {
		parport_write_data(gc->pd->port, ~(1 << i));
		data[i] = parport_read_status(gc->pd->port) ^ 0x7f;
	}
}

static void gc_multi_process_packet(struct gc *gc)
{
	unsigned char data[GC_MULTI2_LENGTH];
	int data_len = gc->pad_count[GC_MULTI2] ? GC_MULTI2_LENGTH : GC_MULTI_LENGTH;
	struct gc_pad *pad;
	struct input_dev *dev;
	int i, s;

	gc_multi_read_packet(gc, data_len, data);

	for (i = 0; i < GC_MAX_DEVICES; i++) {
		pad = &gc->pads[i];
		dev = pad->dev;
		s = gc_status_bit[i];

		switch (pad->type) {
		case GC_MULTI2:
			input_report_key(dev, BTN_THUMB, s & data[5]);
			fallthrough;

		case GC_MULTI:
			input_report_abs(dev, ABS_X,
					 !(s & data[2]) - !(s & data[3]));
			input_report_abs(dev, ABS_Y,
					 !(s & data[0]) - !(s & data[1]));
			input_report_key(dev, BTN_TRIGGER, s & data[4]);
			input_sync(dev);
			break;

		default:
			break;
		}
	}
}

/*
 * PSX support
 *
 * See documentation at:
 *	http://www.geocities.co.jp/Playtown/2004/psx/ps_eng.txt	
 *	http://www.gamesx.com/controldata/psxcont/psxcont.htm
 *
 */

#define GC_PSX_DELAY	25		/* 25 usec */
#define GC_PSX_LENGTH	8		/* talk to the controller in bits */
#define GC_PSX_BYTES	6		/* the maximum number of bytes to read off the controller */

#define GC_PSX_MOUSE	1		/* Mouse */
#define GC_PSX_NEGCON	2		/* NegCon */
#define GC_PSX_NORMAL	4		/* Digital / Analog or Rumble in Digital mode  */
#define GC_PSX_ANALOG	5		/* Analog in Analog mode / Rumble in Green mode */
#define GC_PSX_RUMBLE	7		/* Rumble in Red mode */

#define GC_PSX_CLOCK	0x04		/* Pin 4 */
#define GC_PSX_COMMAND	0x01		/* Pin 2 */
#define GC_PSX_POWER	0xf8		/* Pins 5-9 */
#define GC_PSX_SELECT	0x02		/* Pin 3 */

#define GC_PSX_ID(x)	((x) >> 4)	/* High nibble is device type */
#define GC_PSX_LEN(x)	(((x) & 0xf) << 1)	/* Low nibble is length in bytes/2 */

static int gc_psx_delay = GC_PSX_DELAY;
module_param_named(psx_delay, gc_psx_delay, uint, 0);
MODULE_PARM_DESC(psx_delay, "Delay when accessing Sony PSX controller (usecs)");

static const short gc_psx_abs[] = {
	ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_HAT0X, ABS_HAT0Y
};
static const short gc_psx_btn[] = {
	BTN_TL, BTN_TR, BTN_TL2, BTN_TR2, BTN_A, BTN_B, BTN_X, BTN_Y,
	BTN_START, BTN_SELECT, BTN_THUMBL, BTN_THUMBR
};
static const short gc_psx_ddr_btn[] = { BTN_0, BTN_1, BTN_2, BTN_3 };

/*
 * gc_psx_command() writes 8bit command and reads 8bit data from
 * the psx pad.
 */

static void gc_psx_command(struct gc *gc, int b, unsigned char *data)
{
	struct parport *port = gc->pd->port;
	int i, j, cmd, read;

	memset(data, 0, GC_MAX_DEVICES);

	for (i = 0; i < GC_PSX_LENGTH; i++, b >>= 1) {
		cmd = (b & 1) ? GC_PSX_COMMAND : 0;
		parport_write_data(port, cmd | GC_PSX_POWER);
		udelay(gc_psx_delay);

		read = parport_read_status(port) ^ 0x80;

		for (j = 0; j < GC_MAX_DEVICES; j++) {
			struct gc_pad *pad = &gc->pads[j];

			if (pad->type == GC_PSX || pad->type == GC_DDR)
				data[j] |= (read & gc_status_bit[j]) ? (1 << i) : 0;
		}

		parport_write_data(gc->pd->port, cmd | GC_PSX_CLOCK | GC_PSX_POWER);
		udelay(gc_psx_delay);
	}
}

/*
 * gc_psx_read_packet() reads a whole psx packet and returns
 * device identifier code.
 */

static void gc_psx_read_packet(struct gc *gc,
			       unsigned char data[GC_MAX_DEVICES][GC_PSX_BYTES],
			       unsigned char id[GC_MAX_DEVICES])
{
	int i, j, max_len = 0;
	unsigned long flags;
	unsigned char data2[GC_MAX_DEVICES];

	/* Select pad */
	parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_SELECT | GC_PSX_POWER);
	udelay(gc_psx_delay);
	/* Deselect, begin command */
	parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_POWER);
	udelay(gc_psx_delay);

	local_irq_save(flags);

	gc_psx_command(gc, 0x01, data2);	/* Access pad */
	gc_psx_command(gc, 0x42, id);		/* Get device ids */
	gc_psx_command(gc, 0, data2);		/* Dump status */

	/* Find the longest pad */
	for (i = 0; i < GC_MAX_DEVICES; i++) {
		struct gc_pad *pad = &gc->pads[i];

		if ((pad->type == GC_PSX || pad->type == GC_DDR) &&
		    GC_PSX_LEN(id[i]) > max_len &&
		    GC_PSX_LEN(id[i]) <= GC_PSX_BYTES) {
			max_len = GC_PSX_LEN(id[i]);
		}
	}

	/* Read in all the data */
	for (i = 0; i < max_len; i++) {
		gc_psx_command(gc, 0, data2);
		for (j = 0; j < GC_MAX_DEVICES; j++)
			data[j][i] = data2[j];
	}

	local_irq_restore(flags);

	parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_SELECT | GC_PSX_POWER);

	/* Set id's to the real value */
	for (i = 0; i < GC_MAX_DEVICES; i++)
		id[i] = GC_PSX_ID(id[i]);
}

static void gc_psx_report_one(struct gc_pad *pad, unsigned char psx_type,
			      unsigned char *data)
{
	struct input_dev *dev = pad->dev;
	int i;

	switch (psx_type) {

	case GC_PSX_RUMBLE:

		input_report_key(dev, BTN_THUMBL, ~data[0] & 0x04);
		input_report_key(dev, BTN_THUMBR, ~data[0] & 0x02);
		fallthrough;

	case GC_PSX_NEGCON:
	case GC_PSX_ANALOG:

		if (pad->type == GC_DDR) {
			for (i = 0; i < 4; i++)
				input_report_key(dev, gc_psx_ddr_btn[i],
						 ~data[0] & (0x10 << i));
		} else {
			for (i = 0; i < 4; i++)
				input_report_abs(dev, gc_psx_abs[i + 2],
						 data[i + 2]);

			input_report_abs(dev, ABS_X,
				!!(data[0] & 0x80) * 128 + !(data[0] & 0x20) * 127);
			input_report_abs(dev, ABS_Y,
				!!(data[0] & 0x10) * 128 + !(data[0] & 0x40) * 127);
		}

		for (i = 0; i < 8; i++)
			input_report_key(dev, gc_psx_btn[i], ~data[1] & (1 << i));

		input_report_key(dev, BTN_START,  ~data[0] & 0x08);
		input_report_key(dev, BTN_SELECT, ~data[0] & 0x01);

		input_sync(dev);

		break;

	case GC_PSX_NORMAL:

		if (pad->type == GC_DDR) {
			for (i = 0; i < 4; i++)
				input_report_key(dev, gc_psx_ddr_btn[i],
						 ~data[0] & (0x10 << i));
		} else {
			input_report_abs(dev, ABS_X,
				!!(data[0] & 0x80) * 128 + !(data[0] & 0x20) * 127);
			input_report_abs(dev, ABS_Y,
				!!(data[0] & 0x10) * 128 + !(data[0] & 0x40) * 127);

			/*
			 * For some reason if the extra axes are left unset
			 * they drift.
			 * for (i = 0; i < 4; i++)
				input_report_abs(dev, gc_psx_abs[i + 2], 128);
			 * This needs to be debugged properly,
			 * maybe fuzz processing needs to be done
			 * in input_sync()
			 *				 --vojtech
			 */
		}

		for (i = 0; i < 8; i++)
			input_report_key(dev, gc_psx_btn[i], ~data[1] & (1 << i));

		input_report_key(dev, BTN_START,  ~data[0] & 0x08);
		input_report_key(dev, BTN_SELECT, ~data[0] & 0x01);

		input_sync(dev);

		break;

	default: /* not a pad, ignore */
		break;
	}
}

static void gc_psx_process_packet(struct gc *gc)
{
	unsigned char data[GC_MAX_DEVICES][GC_PSX_BYTES];
	unsigned char id[GC_MAX_DEVICES];
	struct gc_pad *pad;
	int i;

	gc_psx_read_packet(gc, data, id);

	for (i = 0; i < GC_MAX_DEVICES; i++) {
		pad = &gc->pads[i];
		if (pad->type == GC_PSX || pad->type == GC_DDR)
			gc_psx_report_one(pad, id[i], data[i]);
	}
}

/*
 * gc_timer() initiates reads of console pads data.
 */

static void gc_timer(struct timer_list *t)
{
	struct gc *gc = from_timer(gc, t, timer);

/*
 * N64 pads - must be read first, any read confuses them for 200 us
 */

	if (gc->pad_count[GC_N64])
		gc_n64_process_packet(gc);

/*
 * NES and SNES pads or mouse
 */

	if (gc->pad_count[GC_NES] ||
	    gc->pad_count[GC_SNES] ||
	    gc->pad_count[GC_SNESMOUSE]) {
		gc_nes_process_packet(gc);
	}

/*
 * Multi and Multi2 joysticks
 */

	if (gc->pad_count[GC_MULTI] || gc->pad_count[GC_MULTI2])
		gc_multi_process_packet(gc);

/*
 * PSX controllers
 */

	if (gc->pad_count[GC_PSX] || gc->pad_count[GC_DDR])
		gc_psx_process_packet(gc);

	mod_timer(&gc->timer, jiffies + GC_REFRESH_TIME);
}

static int gc_open(struct input_dev *dev)
{
	struct gc *gc = input_get_drvdata(dev);
	int err;

	err = mutex_lock_interruptible(&gc->mutex);
	if (err)
		return err;

	if (!gc->used++) {
		parport_claim(gc->pd);
		parport_write_control(gc->pd->port, 0x04);
		mod_timer(&gc->timer, jiffies + GC_REFRESH_TIME);
	}

	mutex_unlock(&gc->mutex);
	return 0;
}

static void gc_close(struct input_dev *dev)
{
	struct gc *gc = input_get_drvdata(dev);

	mutex_lock(&gc->mutex);
	if (!--gc->used) {
		del_timer_sync(&gc->timer);
		parport_write_control(gc->pd->port, 0x00);
		parport_release(gc->pd);
	}
	mutex_unlock(&gc->mutex);
}

static int gc_setup_pad(struct gc *gc, int idx, int pad_type)
{
	struct gc_pad *pad = &gc->pads[idx];
	struct input_dev *input_dev;
	int i;
	int err;

	if (pad_type < 1 || pad_type >= GC_MAX) {
		pr_err("Pad type %d unknown\n", pad_type);
		return -EINVAL;
	}

	pad->dev = input_dev = input_allocate_device();
	if (!input_dev) {
		pr_err("Not enough memory for input device\n");
		return -ENOMEM;
	}

	pad->type = pad_type;

	snprintf(pad->phys, sizeof(pad->phys),
		 "%s/input%d", gc->pd->port->name, idx);

	input_dev->name = gc_names[pad_type];
	input_dev->phys = pad->phys;
	input_dev->id.bustype = BUS_PARPORT;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = pad_type;
	input_dev->id.version = 0x0100;

	input_set_drvdata(input_dev, gc);

	input_dev->open = gc_open;
	input_dev->close = gc_close;

	if (pad_type != GC_SNESMOUSE) {
		input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

		for (i = 0; i < 2; i++)
			input_set_abs_params(input_dev, ABS_X + i, -1, 1, 0, 0);
	} else
		input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);

	gc->pad_count[pad_type]++;

	switch (pad_type) {

	case GC_N64:
		for (i = 0; i < 10; i++)
			input_set_capability(input_dev, EV_KEY, gc_n64_btn[i]);

		for (i = 0; i < 2; i++) {
			input_set_abs_params(input_dev, ABS_X + i, -127, 126, 0, 2);
			input_set_abs_params(input_dev, ABS_HAT0X + i, -1, 1, 0, 0);
		}

		err = gc_n64_init_ff(input_dev, idx);
		if (err) {
			pr_warn("Failed to initiate rumble for N64 device %d\n",
				idx);
			goto err_free_dev;
		}

		break;

	case GC_SNESMOUSE:
		input_set_capability(input_dev, EV_KEY, BTN_LEFT);
		input_set_capability(input_dev, EV_KEY, BTN_RIGHT);
		input_set_capability(input_dev, EV_REL, REL_X);
		input_set_capability(input_dev, EV_REL, REL_Y);
		break;

	case GC_SNES:
		for (i = 4; i < 8; i++)
			input_set_capability(input_dev, EV_KEY, gc_snes_btn[i]);
		fallthrough;

	case GC_NES:
		for (i = 0; i < 4; i++)
			input_set_capability(input_dev, EV_KEY, gc_snes_btn[i]);
		break;

	case GC_MULTI2:
		input_set_capability(input_dev, EV_KEY, BTN_THUMB);
		fallthrough;

	case GC_MULTI:
		input_set_capability(input_dev, EV_KEY, BTN_TRIGGER);
		break;

	case GC_PSX:
		for (i = 0; i < 6; i++)
			input_set_abs_params(input_dev,
					     gc_psx_abs[i], 4, 252, 0, 2);
		for (i = 0; i < 12; i++)
			input_set_capability(input_dev, EV_KEY, gc_psx_btn[i]);
		break;

		break;

	case GC_DDR:
		for (i = 0; i < 4; i++)
			input_set_capability(input_dev, EV_KEY,
					     gc_psx_ddr_btn[i]);
		for (i = 0; i < 12; i++)
			input_set_capability(input_dev, EV_KEY, gc_psx_btn[i]);

		break;
	}

	err = input_register_device(pad->dev);
	if (err)
		goto err_free_dev;

	return 0;

err_free_dev:
	input_free_device(pad->dev);
	pad->dev = NULL;
	return err;
}

static void gc_attach(struct parport *pp)
{
	struct gc *gc;
	struct pardevice *pd;
	int i, port_idx;
	int count = 0;
	int *pads, n_pads;
	struct pardev_cb gc_parport_cb;

	for (port_idx = 0; port_idx < GC_MAX_PORTS; port_idx++) {
		if (gc_cfg[port_idx].nargs == 0 || gc_cfg[port_idx].args[0] < 0)
			continue;

		if (gc_cfg[port_idx].args[0] == pp->number)
			break;
	}

	if (port_idx == GC_MAX_PORTS) {
		pr_debug("Not using parport%d.\n", pp->number);
		return;
	}
	pads = gc_cfg[port_idx].args + 1;
	n_pads = gc_cfg[port_idx].nargs - 1;

	memset(&gc_parport_cb, 0, sizeof(gc_parport_cb));
	gc_parport_cb.flags = PARPORT_FLAG_EXCL;

	pd = parport_register_dev_model(pp, "gamecon", &gc_parport_cb,
					port_idx);
	if (!pd) {
		pr_err("parport busy already - lp.o loaded?\n");
		return;
	}

	gc = kzalloc(sizeof(struct gc), GFP_KERNEL);
	if (!gc) {
		pr_err("Not enough memory\n");
		goto err_unreg_pardev;
	}

	mutex_init(&gc->mutex);
	gc->pd = pd;
	gc->parportno = pp->number;
	timer_setup(&gc->timer, gc_timer, 0);

	for (i = 0; i < n_pads && i < GC_MAX_DEVICES; i++) {
		if (!pads[i])
			continue;

		if (gc_setup_pad(gc, i, pads[i]))
			goto err_unreg_devs;

		count++;
	}

	if (count == 0) {
		pr_err("No valid devices specified\n");
		goto err_free_gc;
	}

	gc_base[port_idx] = gc;
	return;

 err_unreg_devs:
	while (--i >= 0)
		if (gc->pads[i].dev)
			input_unregister_device(gc->pads[i].dev);
 err_free_gc:
	kfree(gc);
 err_unreg_pardev:
	parport_unregister_device(pd);
}

static void gc_detach(struct parport *port)
{
	int i;
	struct gc *gc;

	for (i = 0; i < GC_MAX_PORTS; i++) {
		if (gc_base[i] && gc_base[i]->parportno == port->number)
			break;
	}

	if (i == GC_MAX_PORTS)
		return;

	gc = gc_base[i];
	gc_base[i] = NULL;

	for (i = 0; i < GC_MAX_DEVICES; i++)
		if (gc->pads[i].dev)
			input_unregister_device(gc->pads[i].dev);
	parport_unregister_device(gc->pd);
	kfree(gc);
}

static struct parport_driver gc_parport_driver = {
	.name = "gamecon",
	.match_port = gc_attach,
	.detach = gc_detach,
	.devmodel = true,
};

static int __init gc_init(void)
{
	int i;
	int have_dev = 0;

	for (i = 0; i < GC_MAX_PORTS; i++) {
		if (gc_cfg[i].nargs == 0 || gc_cfg[i].args[0] < 0)
			continue;

		if (gc_cfg[i].nargs < 2) {
			pr_err("at least one device must be specified\n");
			return -EINVAL;
		}

		have_dev = 1;
	}

	if (!have_dev)
		return -ENODEV;

	return parport_register_driver(&gc_parport_driver);
}

static void __exit gc_exit(void)
{
	parport_unregister_driver(&gc_parport_driver);
}

module_init(gc_init);
module_exit(gc_exit);