summaryrefslogtreecommitdiff
path: root/hw/kdrive/linux/mouse.c
blob: 782f92fd2107d0fd2ece5021478aa6561c343beb (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
/*
 * $RCSId: xc/programs/Xserver/hw/kdrive/linux/mouse.c,v 1.6 2002/08/02 16:11:35 keithp Exp $
 *
 * Copyright © 2001 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#define NEED_EVENTS
#include <errno.h>
#include <termios.h>
#include <X11/X.h>
#include <X11/Xproto.h>
#include <X11/Xpoll.h>
#include "inputstr.h"
#include "scrnintstr.h"
#include "kdrive.h"

#undef DEBUG
#undef DEBUG_BYTES
#define KBUFIO_SIZE 256

typedef struct _kbufio {
    int		    fd;
    unsigned char   buf[KBUFIO_SIZE];
    int		    avail;
    int		    used;
} Kbufio;

Bool
MouseWaitForReadable (int fd, int timeout)
{
    fd_set	    set;
    struct timeval  tv, *tp;
    int		    n;

    FD_ZERO (&set);
    FD_SET (fd, &set);
    if (timeout == -1)
	tp = 0;
    else
    {
	tv.tv_sec = timeout / 1000;
	tv.tv_usec = (timeout % 1000) * 1000;
	tp = &tv;
    }
    n = select (fd + 1, &set, 0, 0, tp);
    if (n > 0)
	return TRUE;
    return FALSE;
}

int
MouseReadByte (Kbufio *b, int timeout)
{
    int	n;
    if (b->avail <= b->used)
    {
	if (timeout && !MouseWaitForReadable (b->fd, timeout))
	    return -1;
	n = read (b->fd, b->buf, KBUFIO_SIZE);
	if (n <= 0)
	    return -1;
        b->avail = n;
        b->used = 0;
    }
#ifdef DEBUG_BYTES
    ErrorF ("\tget %02x\n", b->buf[b->used]);
#endif
    return b->buf[b->used++];
}

int
MouseFlush (Kbufio *b, char *buf, int size)
{
    CARD32  now = GetTimeInMillis ();
    CARD32  done = now + 100;
    int	    p = 0;
    int	    c;
    int	    n = 0;
    
    while ((c = MouseReadByte (b, done - now)) != -1)
    {
	if (buf)
	{
	    if (n == size)
	    {
		memmove (buf, buf + 1, size - 1);
		n--;
	    }
	    buf[n++] = c;
	}
	now = GetTimeInMillis ();
	if ((INT32) (now - done) >= 0)
	    break;
    }
    return n;
}

int
MousePeekByte (Kbufio *b, int timeout)
{
    int	    c;

    c = MouseReadByte (b, timeout);
    if (c != -1)
	--b->used;
    return c;
}

Bool
MouseWaitForWritable (int fd, int timeout)
{
    fd_set	    set;
    struct timeval  tv, *tp;
    int		    n;

    FD_ZERO (&set);
    FD_SET (fd, &set);
    if (timeout == -1)
	tp = 0;
    else
    {
	tv.tv_sec = timeout / 1000;
	tv.tv_usec = (timeout % 1000) * 1000;
	tp = &tv;
    }
    n = select (fd + 1, 0, &set, 0, tp);
    if (n > 0)
	return TRUE;
    return FALSE;
}

Bool
MouseWriteByte (int fd, unsigned char c, int timeout)
{
    int	ret;
    
#ifdef DEBUG_BYTES
    ErrorF ("\tput %02x\n", c);
#endif
    for (;;)
    {
	ret = write (fd, &c, 1);
	if (ret == 1)
	    return TRUE;
	if (ret == 0)
	    return FALSE;
	if (errno != EWOULDBLOCK)
	    return FALSE;
	if (!MouseWaitForWritable (fd, timeout))
	    return FALSE;
    }
}

Bool
MouseWriteBytes (int fd, unsigned char *c, int n, int timeout)
{
    while (n--)
	if (!MouseWriteByte (fd, *c++, timeout))
	    return FALSE;
    return TRUE;
}

#define MAX_MOUSE   10	    /* maximum length of mouse protocol */
#define MAX_SKIP    16	    /* number of error bytes before switching */
#define MAX_VALID   4	    /* number of valid packets before accepting */

typedef struct _kmouseProt {
    char	    *name;
    Bool	    (*Complete) (KdMouseInfo *mi, unsigned char *ev, int ne);
    int		    (*Valid) (KdMouseInfo *mi, unsigned char *ev, int ne);
    Bool	    (*Parse) (KdMouseInfo *mi, unsigned char *ev, int ne);
    Bool	    (*Init) (KdMouseInfo *mi);
    unsigned char   headerMask, headerValid;
    unsigned char   dataMask, dataValid;
    Bool	    tty;
    unsigned int    c_iflag;
    unsigned int    c_oflag;
    unsigned int    c_lflag;
    unsigned int    c_cflag;
    unsigned int    speed;
    unsigned char   *init;
    unsigned long   state;
} KmouseProt;

typedef enum _kmouseStage {
    MouseBroken, MouseTesting, MouseWorking
} KmouseStage;

typedef struct _kmouse {
    Kbufio		iob;
    const KmouseProt	*prot;
    int			i_prot;
    KmouseStage		stage;	/* protocol verification stage */
    Bool		tty;	/* mouse device is a tty */
    int			valid;	/* sequential valid events */
    int			tested;	/* bytes scanned during Testing phase */
    int			invalid;/* total invalid bytes for this protocol */
    unsigned long	state;	/* private per protocol, init to prot->state */
} Kmouse;
    
static int mouseValid (KdMouseInfo *mi, unsigned char *ev, int ne)
{
    Kmouse		*km = mi->driver;
    const KmouseProt	*prot = km->prot;
    int	    i;

    for (i = 0; i < ne; i++)
	if ((ev[i] & prot->headerMask) == prot->headerValid)
	    break;
    if (i != 0)
	return i;
    for (i = 1; i < ne; i++)
	if ((ev[i] & prot->dataMask) != prot->dataValid)
	    return -1;
    return 0;
}

static Bool threeComplete (KdMouseInfo *mi, unsigned char *ev, int ne)
{
    return ne == 3;
}

static Bool fourComplete (KdMouseInfo *mi, unsigned char *ev, int ne)
{
    return ne == 4;
}

static Bool fiveComplete (KdMouseInfo *mi, unsigned char *ev, int ne)
{
    return ne == 5;
}

static Bool MouseReasonable (KdMouseInfo *mi, unsigned long flags, int dx, int dy)
{
    Kmouse		*km = mi->driver;

    if (km->stage == MouseWorking) 
	return TRUE;
    if (dx < -50 || dx > 50) 
    {
#ifdef DEBUG
	ErrorF ("Large X %d\n", dx);
#endif
	return FALSE;
    }
    if (dy < -50 || dy > 50) 
    {
#ifdef DEBUG
	ErrorF ("Large Y %d\n", dy);
#endif
	return FALSE;
    }
    return TRUE;
}

/*
 * Standard PS/2 mouse protocol
 */
static Bool ps2Parse (KdMouseInfo *mi, unsigned char *ev, int ne)
{
    Kmouse	    *km = mi->driver;
    int		    dx, dy, dz;
    unsigned long   flags;
    unsigned long   flagsrelease = 0;
    
    flags = KD_MOUSE_DELTA;
    if (ev[0] & 4)
	flags |= KD_BUTTON_2;
    if (ev[0] & 2)
	flags |= KD_BUTTON_3;
    if (ev[0] & 1)
	flags |= KD_BUTTON_1;
    
    if (ne > 3)
    {
	dz = (int) (signed char) ev[3];
	if (dz < 0)
	{
	    flags |= KD_BUTTON_4;
	    flagsrelease = KD_BUTTON_4;
	}
	else if (dz > 0)
	{
	    flags |= KD_BUTTON_5;
	    flagsrelease = KD_BUTTON_5;
	}
    }
	
    dx = ev[1];
    if (ev[0] & 0x10)
	dx -= 256;
    dy = ev[2];
    if (ev[0] & 0x20)
	dy -= 256;
    dy = -dy;
    if (!MouseReasonable (mi, flags, dx, dy))
	return FALSE;
    if (km->stage == MouseWorking)
    {
	KdEnqueueMouseEvent (mi, flags, dx, dy);
	if (flagsrelease)
	{
	    flags &= ~flagsrelease;
	    KdEnqueueMouseEvent (mi, flags, dx, dy);
	}
    }
    return TRUE;
}

static Bool ps2Init (KdMouseInfo *mi);

static const KmouseProt ps2Prot = {
    "ps/2",
    threeComplete, mouseValid, ps2Parse, ps2Init,
    0x08, 0x08, 0x00, 0x00,
    FALSE
};

static const KmouseProt imps2Prot = {
    "imps/2",
    fourComplete, mouseValid, ps2Parse, ps2Init,
    0x08, 0x08, 0x00, 0x00,
    FALSE
};

static const KmouseProt exps2Prot = {
    "exps/2",
    fourComplete, mouseValid, ps2Parse, ps2Init,
    0x08, 0x08, 0x00, 0x00,
    FALSE
};

/*
 * Once the mouse is known to speak ps/2 protocol, go and find out
 * what advanced capabilities it has and turn them on
 */

/* these extracted from FreeBSD 4.3 sys/dev/kbd/atkbdcreg.h */

/* aux device commands (sent to KBD_DATA_PORT) */
#define PSMC_SET_SCALING11      0x00e6
#define PSMC_SET_SCALING21      0x00e7
#define PSMC_SET_RESOLUTION     0x00e8
#define PSMC_SEND_DEV_STATUS    0x00e9
#define PSMC_SET_STREAM_MODE    0x00ea
#define PSMC_SEND_DEV_DATA      0x00eb
#define PSMC_SET_REMOTE_MODE    0x00f0
#define PSMC_SEND_DEV_ID        0x00f2
#define PSMC_SET_SAMPLING_RATE  0x00f3
#define PSMC_ENABLE_DEV         0x00f4
#define PSMC_DISABLE_DEV        0x00f5
#define PSMC_SET_DEFAULTS       0x00f6
#define PSMC_RESET_DEV          0x00ff

/* PSMC_SET_RESOLUTION argument */
#define PSMD_RES_LOW            0       /* typically 25ppi */
#define PSMD_RES_MEDIUM_LOW     1       /* typically 50ppi */
#define PSMD_RES_MEDIUM_HIGH    2       /* typically 100ppi (default) */
#define PSMD_RES_HIGH           3       /* typically 200ppi */
#define PSMD_MAX_RESOLUTION     PSMD_RES_HIGH

/* PSMC_SET_SAMPLING_RATE */
#define PSMD_MAX_RATE           255     /* FIXME: not sure if it's possible */

/* aux device ID */
#define PSM_MOUSE_ID            0
#define PSM_BALLPOINT_ID        2
#define PSM_INTELLI_ID          3
#define PSM_EXPLORER_ID         4
#define PSM_4DMOUSE_ID          6
#define PSM_4DPLUS_ID           8

static unsigned char	ps2_init[] = { 
    PSMC_ENABLE_DEV,
    0,
};

#define NINIT_PS2   1

static unsigned char    wheel_3button_init[] = { 
    PSMC_SET_SAMPLING_RATE, 200,
    PSMC_SET_SAMPLING_RATE, 100,
    PSMC_SET_SAMPLING_RATE,  80,
    PSMC_SEND_DEV_ID,
    0,
};

#define NINIT_IMPS2 4

static unsigned char    wheel_5button_init[] = {
    PSMC_SET_SAMPLING_RATE, 200,
    PSMC_SET_SAMPLING_RATE, 100,
    PSMC_SET_SAMPLING_RATE,  80,
    PSMC_SET_SAMPLING_RATE, 200,
    PSMC_SET_SAMPLING_RATE, 200,
    PSMC_SET_SAMPLING_RATE,  80,
    PSMC_SEND_DEV_ID, 
    0
};

#define NINIT_EXPS2 7

static unsigned char	intelli_init[] = {
    PSMC_SET_SAMPLING_RATE, 200,
    PSMC_SET_SAMPLING_RATE, 100, 
    PSMC_SET_SAMPLING_RATE,  80, 
    0
};

#define NINIT_INTELLI	3

static int
ps2SkipInit (KdMouseInfo *mi, int ninit, Bool ret_next)
{
    Kmouse  *km = mi->driver;
    int	    c;
    int	    skipping;
    Bool    waiting;
    
    skipping = 0;
    waiting = FALSE;
    while (ninit || ret_next)
    {
	c = MouseReadByte (&km->iob, 100);
	if (c == -1)
	    break;
	/* look for ACK */
	if (c == 0xfa)
	{
	    ninit--;
	    if (ret_next)
		waiting = TRUE;
	}
	/* look for packet start -- not the response */
	else if ((c & 0x08) == 0x08)
	    waiting = FALSE;
	else if (waiting)
	    break;
    }
    return c;
}

static Bool
ps2Init (KdMouseInfo *mi)
{
    Kmouse	    *km = mi->driver;
    int		    c;
    int		    skipping;
    Bool	    waiting;
    int		    id;
    unsigned char   *init;
    int		    ninit;
    
    /* Send Intellimouse initialization sequence */
    MouseWriteBytes (km->iob.fd, intelli_init, strlen (intelli_init), 100);
    /*
     * Send ID command
     */
    if (!MouseWriteByte (km->iob.fd, PSMC_SEND_DEV_ID, 100))
	return FALSE;
    skipping = 0;
    waiting = FALSE;
    id = ps2SkipInit (mi, 0, TRUE);
    switch (id) {
    case 3:
	init = wheel_3button_init;
	ninit = NINIT_IMPS2;
	km->prot = &imps2Prot;
	break;
    case 4:
	init = wheel_5button_init;
	ninit = NINIT_EXPS2;
	km->prot = &exps2Prot;
	break;
    default:
	init = ps2_init;
	ninit = NINIT_PS2;
	km->prot = &ps2Prot;
	break;
    }
    if (init)
	MouseWriteBytes (km->iob.fd, init, strlen (init), 100);
    /*
     * Flush out the available data to eliminate responses to the
     * initialization string.  Make sure any partial event is
     * skipped
     */
    (void) ps2SkipInit (mi, ninit, FALSE);
}

static Bool busParse (KdMouseInfo *mi, unsigned char *ev, int ne)
{
    Kmouse	    *km = mi->driver;
    int		    dx, dy;
    unsigned long   flags;
    
    flags = KD_MOUSE_DELTA;
    dx = (signed char) ev[1];
    dy = -(signed char) ev[2];
    if ((ev[0] & 4) == 0)
	flags |= KD_BUTTON_1;
    if ((ev[0] & 2) == 0)
	flags |= KD_BUTTON_2;
    if ((ev[0] & 1) == 0)
	flags |= KD_BUTTON_3;
    if (!MouseReasonable (mi, flags, dx, dy))
	return FALSE;
    if (km->stage == MouseWorking)
	KdEnqueueMouseEvent (mi, flags, dx, dy);
    return TRUE;
}

static const KmouseProt busProt = {
    "bus",
    threeComplete, mouseValid, busParse, 0,
    0xf8, 0x00, 0x00, 0x00,
    FALSE
};

/*
 * Standard MS serial protocol, three bytes
 */

static Bool msParse (KdMouseInfo *mi, unsigned char *ev, int ne)
{
    Kmouse	    *km = mi->driver;
    int		    dx, dy;
    unsigned long   flags;

    flags = KD_MOUSE_DELTA;

    if (ev[0] & 0x20)
	flags |= KD_BUTTON_1;
    if (ev[0] & 0x10)
	flags |= KD_BUTTON_3;

    dx = (signed char)(((ev[0] & 0x03) << 6) | (ev[1] & 0x3F));
    dy = (signed char)(((ev[0] & 0x0C) << 4) | (ev[2] & 0x3F));
    if (!MouseReasonable (mi, flags, dx, dy))
	return FALSE;
    if (km->stage == MouseWorking)
	KdEnqueueMouseEvent (mi, flags, dx, dy);
    return TRUE;
}

static const KmouseProt msProt = {
    "ms",
    threeComplete, mouseValid, msParse, 0,
    0xc0, 0x40, 0xc0, 0x00,
    TRUE,
    IGNPAR,
    0,
    0,
    CS7 | CSTOPB | CREAD | CLOCAL,
    B1200,
};

/*
 * Logitech mice send 3 or 4 bytes, the only way to tell is to look at the
 * first byte of a synchronized protocol stream and see if it's got
 * any bits turned on that can't occur in that fourth byte
 */
static Bool logiComplete (KdMouseInfo *mi, unsigned char *ev, int ne)
{
    Kmouse		*km = mi->driver;
    const KmouseProt	*prot = km->prot;
    int			c;

    if ((ev[0] & 0x40) == 0x40)
	return ne == 3;
    if (km->stage != MouseBroken && (ev[0] & ~0x23) == 0)
	return ne == 1;
}

static int logiValid (KdMouseInfo *mi, unsigned char *ev, int ne)
{
    Kmouse		*km = mi->driver;
    const KmouseProt	*prot = km->prot;
    int	    i;

    for (i = 0; i < ne; i++)
    {
	if ((ev[i] & 0x40) == 0x40)
	    break;
	if (km->stage != MouseBroken && (ev[i] & ~0x23) == 0)
	    break;
    }
    if (i != 0)
	return i;
    for (i = 1; i < ne; i++)
	if ((ev[i] & prot->dataMask) != prot->dataValid)
	    return -1;
    return 0;
}

static Bool logiParse (KdMouseInfo *mi, unsigned char *ev, int ne)
{
    Kmouse	    *km = mi->driver;
    int		    dx, dy;
    unsigned long   flags;

    flags = KD_MOUSE_DELTA;
    
    if (ne == 3)
    {
	if (ev[0] & 0x20)
	    flags |= KD_BUTTON_1;
	if (ev[0] & 0x10)
	    flags |= KD_BUTTON_3;
    
	dx = (signed char)(((ev[0] & 0x03) << 6) | (ev[1] & 0x3F));
	dy = (signed char)(((ev[0] & 0x0C) << 4) | (ev[2] & 0x3F));
	flags |= km->state & KD_BUTTON_2;
    }
    else
    {
	if (ev[0] & 0x20)
	    flags |= KD_BUTTON_2;
	dx = 0;
	dy = 0;
	flags |= km->state & (KD_BUTTON_1|KD_BUTTON_3);
    }

    if (!MouseReasonable (mi, flags, dx, dy))
	return FALSE;
    if (km->stage == MouseWorking)
	KdEnqueueMouseEvent (mi, flags, dx, dy);
    return TRUE;
}

static const KmouseProt logiProt = {
    "logitech",
    logiComplete, logiValid, logiParse, 0,
    0xc0, 0x40, 0xc0, 0x00,
    TRUE,
    IGNPAR,
    0,
    0,
    CS7 | CSTOPB | CREAD | CLOCAL,
    B1200,
};

/*
 * Mouse systems protocol, 5 bytes
 */
static Bool mscParse (KdMouseInfo *mi, unsigned char *ev, int ne)
{
    Kmouse	    *km = mi->driver;
    int		    dx, dy;
    unsigned long   flags;

    flags = KD_MOUSE_DELTA;
    
    if (!(ev[0] & 0x4))
	flags |= KD_BUTTON_1;
    if (!(ev[0] & 0x2))
	flags |= KD_BUTTON_2;
    if (!(ev[0] & 0x1))
	flags |= KD_BUTTON_3;
    dx =    (signed char)(ev[1]) + (signed char)(ev[3]);
    dy = - ((signed char)(ev[2]) + (signed char)(ev[4]));

    if (!MouseReasonable (mi, flags, dx, dy))
	return FALSE;
    if (km->stage == MouseWorking)
	KdEnqueueMouseEvent (mi, flags, dx, dy);
    return TRUE;
}

static const KmouseProt mscProt = {
    "msc",
    fiveComplete, mouseValid, mscParse, 0,
    0xf8, 0x80, 0x00, 0x00,
    TRUE,
    IGNPAR,
    0,
    0,
    CS8 | CSTOPB | CREAD | CLOCAL,
    B1200,
};

/*
 * Use logitech before ms -- they're the same except that
 * logitech sometimes has a fourth byte
 */
static const KmouseProt *kmouseProts[] = {
    &ps2Prot, &imps2Prot, &exps2Prot, &busProt, &logiProt, &msProt, &mscProt,
};

#define NUM_PROT    (sizeof (kmouseProts) / sizeof (kmouseProts[0]))

void
MouseInitProtocol (Kmouse *km)
{
    int		    ret;
    struct termios  t;

    if (km->prot->tty)
    {
	ret = tcgetattr (km->iob.fd, &t);

	if (ret >= 0)
	{
	    t.c_iflag = km->prot->c_iflag;
	    t.c_oflag = km->prot->c_oflag;
	    t.c_lflag = km->prot->c_lflag;
	    t.c_cflag = km->prot->c_cflag;
	    cfsetispeed (&t, km->prot->speed);
	    cfsetospeed (&t, km->prot->speed);
	    ret = tcsetattr (km->iob.fd, TCSANOW, &t);
	}
    }
    km->stage = MouseBroken;
    km->valid = 0;
    km->tested = 0;
    km->invalid = 0;
    km->state = km->prot->state;
}

void
MouseFirstProtocol (Kmouse *km, char *prot)
{
    if (prot)
    {
	for (km->i_prot = 0; km->i_prot < NUM_PROT; km->i_prot++)
	    if (!strcmp (prot, kmouseProts[km->i_prot]->name))
		break;
	if (km->i_prot == NUM_PROT)
	{
	    int	i;
	    ErrorF ("Unknown mouse protocol \"%s\". Pick one of:", prot);
	    for (i = 0; i < NUM_PROT; i++)
		ErrorF (" %s", kmouseProts[i]->name);
	    ErrorF ("\n");
	}
	else
	{
	    km->prot = kmouseProts[km->i_prot];
	    if (km->tty && !km->prot->tty)
		ErrorF ("Mouse device is serial port, protocol %s is not serial protocol\n",
			prot);
	    else if (!km->tty && km->prot->tty)
		ErrorF ("Mouse device is not serial port, protocol %s is serial protocol\n",
			prot);
	}
    }
    if (!km->prot)
    {
	for (km->i_prot = 0; kmouseProts[km->i_prot]->tty != km->tty; km->i_prot++)
	    ;
	km->prot = kmouseProts[km->i_prot];
    }
    MouseInitProtocol (km);
}

void
MouseNextProtocol (Kmouse *km)
{
    do
    {
	if (!km->prot)
	    km->i_prot = 0;
	else
	    if (++km->i_prot == NUM_PROT) km->i_prot = 0;
	km->prot = kmouseProts[km->i_prot];
    } while (km->prot->tty != km->tty);
    MouseInitProtocol (km);
    ErrorF ("Switching to mouse protocol \"%s\"\n", km->prot->name);
}

void
MouseRead (int mousePort, void *closure)
{
    KdMouseInfo	    *mi = closure;
    Kmouse	    *km = mi->driver;
    unsigned char   event[MAX_MOUSE];
    int		    ne;
    int		    c;
    int		    i;
    int		    timeout;

    timeout = 0;
    ne = 0;
    for(;;)
    {
	c = MouseReadByte (&km->iob, timeout);
	if (c == -1)
	{
	    if (ne)
	    {
		km->invalid += ne + km->tested;
		km->valid = 0;
		km->tested = 0;
		km->stage = MouseBroken;
	    }
	    break;
	}
	event[ne++] = c;
	i = (*km->prot->Valid) (mi, event, ne);
	if (i != 0)
	{
#ifdef DEBUG
	    ErrorF ("Mouse protocol %s broken %d of %d bytes bad\n",
		    km->prot->name, i > 0 ? i : ne, ne);
#endif
	    if (i > 0 && i < ne)
	    {
		ne -= i;
		memmove (event, event + i, ne);
	    }
	    else
	    {
		i = ne;
		ne = 0;
	    }
	    km->invalid += i + km->tested;
	    km->valid = 0;
	    km->tested = 0;
	    km->stage = MouseBroken;
	    if (km->invalid > MAX_SKIP)
	    {
		MouseNextProtocol (km);
		ne = 0;
	    }
	    timeout = 0;
	}
	else
	{
	    if ((*km->prot->Complete) (mi, event, ne))
	    {
		if ((*km->prot->Parse) (mi, event, ne))
		{
		    switch (km->stage)
		    {
		    case MouseBroken:
#ifdef DEBUG			
			ErrorF ("Mouse protocol %s seems OK\n",
				km->prot->name);
#endif
			/* do not zero invalid to accumulate invalid bytes */
			km->valid = 0;
			km->tested = 0;
			km->stage = MouseTesting;
			/* fall through ... */
		    case MouseTesting:
			km->valid++;
			km->tested += ne;
			if (km->valid > MAX_VALID)
			{
#ifdef DEBUG
			    ErrorF ("Mouse protocol %s working\n",
				    km->prot->name);
#endif
			    km->stage = MouseWorking;
			    km->invalid = 0;
			    km->tested = 0;
			    km->valid = 0;
			    if (km->prot->Init && !(*km->prot->Init) (mi))
				km->stage = MouseBroken;
			}
			break;
		    }
		}
		else
		{
		    km->invalid += ne + km->tested;
		    km->valid = 0;
		    km->tested = 0;
		    km->stage = MouseBroken;
		}
		ne = 0;
		timeout = 0;
	    }
	    else
		timeout = 100;
	}
    }
}

int MouseInputType;

char *kdefaultMouse[] =  {
    "/dev/mouse",
    "/dev/psaux",
    "/dev/input/mice",
    "/dev/adbmouse",
    "/dev/ttyS0",
    "/dev/ttyS1",
};

#define NUM_DEFAULT_MOUSE    (sizeof (kdefaultMouse) / sizeof (kdefaultMouse[0]))

int
MouseInit (void)
{
    int		i;
    int		fd;
    Kmouse	*km;
    KdMouseInfo	*mi, *next;
    KmouseProt	*mp;
    int		n = 0;
    char	*prot;

    if (!MouseInputType)
	MouseInputType = KdAllocInputType ();

    for (mi = kdMouseInfo; mi; mi = next)
    {
	next = mi->next;
	prot = mi->prot;
	if (mi->inputType)
	    continue;
	if (!mi->name)
	{
	    for (i = 0; i < NUM_DEFAULT_MOUSE; i++)
	    {
		fd = open (kdefaultMouse[i], 2);
		if (fd >= 0)
		{
		    mi->name = KdSaveString (kdefaultMouse[i]);
		    break;
		}
	    }
	}
	else
	    fd = open (mi->name, 2);
	    
	if (fd >= 0)
	{
	    km = (Kmouse *) xalloc (sizeof (Kmouse));
	    if (km)
	    {
		km->iob.fd = fd;
		km->iob.avail = km->iob.used = 0;
		km->prot = 0;
		km->i_prot = 0;
		km->tty = isatty (fd);
		mi->driver = km;
		mi->inputType = MouseInputType;
		MouseFirstProtocol (km, mi->prot);
		if (KdRegisterFd (MouseInputType, fd, MouseRead, (void *) mi))
		    n++;
	    }
	    else
		close (fd);
	}
    }
}

void
MouseFini (void)
{
    KdMouseInfo	*mi;

    KdUnregisterFds (MouseInputType, TRUE);
    for (mi = kdMouseInfo; mi; mi = mi->next)
    {
	if (mi->inputType == MouseInputType)
	{
	    xfree (mi->driver);
	    mi->driver = 0;
	    mi->inputType = 0;
	}
    }
}

KdMouseFuncs LinuxMouseFuncs = {
    MouseInit,
    MouseFini,
};