aboutsummaryrefslogtreecommitdiff
path: root/xorg-server/hw/xfree86/common/xf86Xinput.c
blob: 4166a1c384e4ef196230f0f6cf114828a1494945 (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
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
/*
 * Copyright 1995-1999 by Frederic Lepied, France. <Lepied@XFree86.org>
 *                                                                            
 * 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  Frederic   Lepied not  be  used  in
 * advertising or publicity pertaining to distribution of the software without
 * specific,  written      prior  permission.     Frederic  Lepied   makes  no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.                   
 *                                                                            
 * FREDERIC  LEPIED DISCLAIMS ALL   WARRANTIES WITH REGARD  TO  THIS SOFTWARE,
 * INCLUDING ALL IMPLIED   WARRANTIES OF MERCHANTABILITY  AND   FITNESS, IN NO
 * EVENT  SHALL FREDERIC  LEPIED 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.
 *
 */
/*
 * Copyright (c) 2000-2002 by The XFree86 Project, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of the copyright holder(s)
 * and author(s) shall not be used in advertising or otherwise to promote
 * the sale, use or other dealings in this Software without prior written
 * authorization from the copyright holder(s) and author(s).
 */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#include <X11/Xfuncproto.h>
#include <X11/Xmd.h>
#include <X11/extensions/XI.h>
#include <X11/extensions/XIproto.h>
#include <X11/Xatom.h>
#include "xf86.h"
#include "xf86Priv.h"
#include "xf86Config.h"
#include "xf86Xinput.h"
#include "xf86Optrec.h"
#include "mipointer.h"
#include "extinit.h"
#include "loaderProcs.h"

#include "exevents.h"	/* AddInputDevice */
#include "exglobals.h"
#include "eventstr.h"
#include "inpututils.h"

#include <string.h>     /* InputClassMatches */
#ifdef HAVE_FNMATCH_H
#include <fnmatch.h>
#endif
#ifdef HAVE_SYS_UTSNAME_H
#include <sys/utsname.h>
#endif

#include <stdarg.h>
#include <stdint.h>          /* for int64_t */

#include "mi.h"

#include <ptrveloc.h>          /* dix pointer acceleration */
#include <xserver-properties.h>

#ifdef XFreeXDGA
#include "dgaproc.h"
#endif

#include "xkbsrv.h"

/* Valuator verification macro */
#define XI_VERIFY_VALUATORS(num_valuators)					\
	if (num_valuators > MAX_VALUATORS) {					\
		xf86Msg(X_ERROR, "%s: num_valuator %d is greater than"		\
			" MAX_VALUATORS\n", __FUNCTION__, num_valuators);	\
		return;								\
	}

EventListPtr xf86Events = NULL;

static int
xf86InputDevicePostInit(DeviceIntPtr dev);

/**
 * Eval config and modify DeviceVelocityRec accordingly
 */
static void
ProcessVelocityConfiguration(DeviceIntPtr pDev, char* devname, pointer list,
                             DeviceVelocityPtr s)
{
    int tempi;
    float tempf;
    Atom float_prop = XIGetKnownProperty(XATOM_FLOAT);
    Atom prop;

    if(!s)
        return;

    /* common settings (available via device properties) */
    tempf = xf86SetRealOption(list, "ConstantDeceleration", 1.0);
    if (tempf > 1.0) {
        xf86Msg(X_CONFIG, "%s: (accel) constant deceleration by %.1f\n",
                devname, tempf);
        prop = XIGetKnownProperty(ACCEL_PROP_CONSTANT_DECELERATION);
        XIChangeDeviceProperty(pDev, prop, float_prop, 32,
                               PropModeReplace, 1, &tempf, FALSE);
    }

    tempf = xf86SetRealOption(list, "AdaptiveDeceleration", 1.0);
    if (tempf > 1.0) {
        xf86Msg(X_CONFIG, "%s: (accel) adaptive deceleration by %.1f\n",
                devname, tempf);
        prop = XIGetKnownProperty(ACCEL_PROP_ADAPTIVE_DECELERATION);
        XIChangeDeviceProperty(pDev, prop, float_prop, 32,
                               PropModeReplace, 1, &tempf, FALSE);
    }

    /* select profile by number */
    tempi = xf86SetIntOption(list, "AccelerationProfile",
            s->statistics.profile_number);

    prop = XIGetKnownProperty(ACCEL_PROP_PROFILE_NUMBER);
    if (XIChangeDeviceProperty(pDev, prop, XA_INTEGER, 32,
                               PropModeReplace, 1, &tempi, FALSE) == Success) {
        xf86Msg(X_CONFIG, "%s: (accel) acceleration profile %i\n", devname,
                tempi);
    } else {
        xf86Msg(X_CONFIG, "%s: (accel) acceleration profile %i is unknown\n",
                devname, tempi);
    }

    /* set scaling */
    tempf = xf86SetRealOption(list, "ExpectedRate", 0);
    prop = XIGetKnownProperty(ACCEL_PROP_VELOCITY_SCALING);
    if (tempf > 0) {
        tempf = 1000.0 / tempf;
        XIChangeDeviceProperty(pDev, prop, float_prop, 32,
                               PropModeReplace, 1, &tempf, FALSE);
    } else {
        tempf = xf86SetRealOption(list, "VelocityScale", s->corr_mul);
        XIChangeDeviceProperty(pDev, prop, float_prop, 32,
                               PropModeReplace, 1, &tempf, FALSE);
    }

    tempi = xf86SetIntOption(list, "VelocityTrackerCount", -1);
    if (tempi > 1)
	InitTrackers(s, tempi);

    s->initial_range = xf86SetIntOption(list, "VelocityInitialRange",
                                        s->initial_range);

    s->max_diff = xf86SetRealOption(list, "VelocityAbsDiff", s->max_diff);

    tempf = xf86SetRealOption(list, "VelocityRelDiff", -1);
    if (tempf >= 0) {
	xf86Msg(X_CONFIG, "%s: (accel) max rel. velocity difference: %.1f%%\n",
	        devname, tempf*100.0);
	s->max_rel_diff = tempf;
    }

    /*  Configure softening. If const deceleration is used, this is expected
     *  to provide better subpixel information so we enable
     *  softening by default only if ConstantDeceleration is not used
     */
    s->use_softening = xf86SetBoolOption(list, "Softening",
                                         s->const_acceleration == 1.0);

    s->average_accel = xf86SetBoolOption(list, "AccelerationProfileAveraging",
                                         s->average_accel);

    s->reset_time = xf86SetIntOption(list, "VelocityReset", s->reset_time);
}

static void
ApplyAccelerationSettings(DeviceIntPtr dev){
    int scheme, i;
    DeviceVelocityPtr pVel;
    InputInfoPtr pInfo = (InputInfoPtr)dev->public.devicePrivate;
    char* schemeStr;

    if (dev->valuator && dev->ptrfeed) {
	schemeStr = xf86SetStrOption(pInfo->options, "AccelerationScheme", "");

	scheme = dev->valuator->accelScheme.number;

	if (!xf86NameCmp(schemeStr, "predictable"))
	    scheme = PtrAccelPredictable;

	if (!xf86NameCmp(schemeStr, "lightweight"))
	    scheme = PtrAccelLightweight;

	if (!xf86NameCmp(schemeStr, "none"))
	    scheme = PtrAccelNoOp;

        /* reinit scheme if needed */
        if (dev->valuator->accelScheme.number != scheme) {
            if (dev->valuator->accelScheme.AccelCleanupProc) {
                dev->valuator->accelScheme.AccelCleanupProc(dev);
            }

            if (InitPointerAccelerationScheme(dev, scheme)) {
		xf86Msg(X_CONFIG, "%s: (accel) selected scheme %s/%i\n",
		        pInfo->name, schemeStr, scheme);
	    } else {
        	xf86Msg(X_CONFIG, "%s: (accel) could not init scheme %s\n",
		        pInfo->name, schemeStr);
        	scheme = dev->valuator->accelScheme.number;
            }
        } else {
            xf86Msg(X_CONFIG, "%s: (accel) keeping acceleration scheme %i\n",
                    pInfo->name, scheme);
        }

        free(schemeStr);

        /* process special configuration */
        switch (scheme) {
            case PtrAccelPredictable:
                pVel = GetDevicePredictableAccelData(dev);
                ProcessVelocityConfiguration (dev, pInfo->name, pInfo->options,
                                              pVel);
                break;
        }

        i = xf86SetIntOption(pInfo->options, "AccelerationNumerator",
                             dev->ptrfeed->ctrl.num);
        if (i >= 0)
            dev->ptrfeed->ctrl.num = i;

        i = xf86SetIntOption(pInfo->options, "AccelerationDenominator",
                             dev->ptrfeed->ctrl.den);
        if (i > 0)
            dev->ptrfeed->ctrl.den = i;

        i = xf86SetIntOption(pInfo->options, "AccelerationThreshold",
                             dev->ptrfeed->ctrl.threshold);
        if (i >= 0)
            dev->ptrfeed->ctrl.threshold = i;

        xf86Msg(X_CONFIG, "%s: (accel) acceleration factor: %.3f\n",
                            pInfo->name, ((float)dev->ptrfeed->ctrl.num)/
                                         ((float)dev->ptrfeed->ctrl.den));
        xf86Msg(X_CONFIG, "%s: (accel) acceleration threshold: %i\n",
                pInfo->name, dev->ptrfeed->ctrl.threshold);
    }
}

/***********************************************************************
 *
 * xf86ProcessCommonOptions --
 * 
 *	Process global options.
 *
 ***********************************************************************
 */
void
xf86ProcessCommonOptions(InputInfoPtr pInfo,
                         pointer	list)
{
    if (xf86SetBoolOption(list, "Floating", 0) ||
        !xf86SetBoolOption(list, "AlwaysCore", 1) ||
        !xf86SetBoolOption(list, "SendCoreEvents", 1) ||
        !xf86SetBoolOption(list, "CorePointer", 1) ||
        !xf86SetBoolOption(list, "CoreKeyboard", 1)) {
        xf86Msg(X_CONFIG, "%s: doesn't report core events\n", pInfo->name);
    } else {
        pInfo->flags |= XI86_ALWAYS_CORE;
        xf86Msg(X_CONFIG, "%s: always reports core events\n", pInfo->name);
    }
}

/***********************************************************************
 *
 * xf86ActivateDevice --
 *
 *	Initialize an input device.
 *
 * Returns TRUE on success, or FALSE otherwise.
 ***********************************************************************
 */
static DeviceIntPtr
xf86ActivateDevice(InputInfoPtr pInfo)
{
    DeviceIntPtr	dev;
    Atom		atom;

    dev = AddInputDevice(serverClient, pInfo->device_control, TRUE);

    if (dev == NULL)
    {
        xf86Msg(X_ERROR, "Too many input devices. Ignoring %s\n",
                pInfo->name);
        pInfo->dev = NULL;
        return NULL;
    }

    atom = MakeAtom(pInfo->type_name, strlen(pInfo->type_name), TRUE);
    AssignTypeAndName(dev, atom, pInfo->name);
    dev->public.devicePrivate = pInfo;
    pInfo->dev = dev;

    dev->coreEvents = pInfo->flags & XI86_ALWAYS_CORE;
    dev->type = SLAVE;
    dev->spriteInfo->spriteOwner = FALSE;

    dev->config_info = xf86SetStrOption(pInfo->options, "config_info", NULL);

    if (serverGeneration == 1)
        xf86Msg(X_INFO, "XINPUT: Adding extended input device \"%s\" (type: %s)\n",
                pInfo->name, pInfo->type_name);

    return dev;
}

/****************************************************************************
 *
 * Caller:	ProcXSetDeviceMode
 *
 * Change the mode of an extension device.
 * This function is used to change the mode of a device from reporting
 * relative motion to reporting absolute positional information, and
 * vice versa.
 * The default implementation below is that no such devices are supported.
 *
 ***********************************************************************
 */

int
SetDeviceMode (ClientPtr client, DeviceIntPtr dev, int mode)
{
  InputInfoPtr        pInfo = (InputInfoPtr)dev->public.devicePrivate;

  if (pInfo->switch_mode) {
    return (*pInfo->switch_mode)(client, dev, mode);
  }
  else
    return BadMatch;
}


/***********************************************************************
 *
 * Caller:	ProcXSetDeviceValuators
 *
 * Set the value of valuators on an extension input device.
 * This function is used to set the initial value of valuators on
 * those input devices that are capable of reporting either relative
 * motion or an absolute position, and allow an initial position to be set.
 * The default implementation below is that no such devices are supported.
 *
 ***********************************************************************
 */

int
SetDeviceValuators (ClientPtr client, DeviceIntPtr dev, int *valuators,
                    int first_valuator, int num_valuators)
{
    InputInfoPtr pInfo = (InputInfoPtr) dev->public.devicePrivate;

    if (pInfo->set_device_valuators)
	return (*pInfo->set_device_valuators)(pInfo, valuators, first_valuator,
					      num_valuators);

    return BadMatch;
}


/***********************************************************************
 *
 * Caller:	ProcXChangeDeviceControl
 *
 * Change the specified device controls on an extension input device.
 *
 ***********************************************************************
 */

int
ChangeDeviceControl (ClientPtr client, DeviceIntPtr dev, xDeviceCtl *control)
{
  InputInfoPtr        pInfo = (InputInfoPtr)dev->public.devicePrivate;

  if (!pInfo->control_proc) {
      switch (control->control) {
      case DEVICE_CORE:
          return BadMatch;
      case DEVICE_RESOLUTION:
      case DEVICE_ABS_CALIB:
      case DEVICE_ABS_AREA:
      case DEVICE_ENABLE:
        return Success;
      default:
        return BadMatch;
      }
  }
  else {
      return (*pInfo->control_proc)(pInfo, control);
  }
}

/*
 * Get the operating system name from uname and store it statically to avoid
 * repeating the system call each time MatchOS is checked.
 */
static const char *
HostOS(void)
{
#ifdef HAVE_SYS_UTSNAME_H
    struct utsname name;
    static char host_os[sizeof(name.sysname)] = "";

    if (*host_os == '\0') {
        if (uname(&name) >= 0)
            strcpy(host_os, name.sysname);
        else {
            strncpy(host_os, "unknown", sizeof(host_os));
            host_os[sizeof(host_os)-1] = '\0';
        }
    }
    return host_os;
#else
    return "";
#endif
}

static int
match_substring(const char *attr, const char *pattern)
{
    return (strstr(attr, pattern)) ? 0 : -1;
}

#ifdef HAVE_FNMATCH_H
static int
match_pattern(const char *attr, const char *pattern)
{
    return fnmatch(pattern, attr, 0);
}
#else
#define match_pattern match_substring
#endif

#ifdef HAVE_FNMATCH_H
static int
match_path_pattern(const char *attr, const char *pattern)
{
    return fnmatch(pattern, attr, FNM_PATHNAME);
}
#else
#define match_path_pattern match_substring
#endif

/*
 * Match an attribute against a list of NULL terminated arrays of patterns.
 * If a pattern in each list entry is matched, return TRUE.
 */
static Bool
MatchAttrToken(const char *attr, struct list *patterns,
               int (*compare)(const char *attr, const char *pattern))
{
    const xf86MatchGroup *group;

    /* If there are no patterns, accept the match */
    if (list_is_empty(patterns))
        return TRUE;

    /* If there are patterns but no attribute, reject the match */
    if (!attr)
        return FALSE;

    /*
     * Otherwise, iterate the list of patterns ensuring each entry has a
     * match. Each list entry is a separate Match line of the same type.
     */
    list_for_each_entry(group, patterns, entry) {
        char * const *cur;
        Bool match = FALSE;

        for (cur = group->values; *cur; cur++)
            if ((*compare)(attr, *cur) == 0) {
                match = TRUE;
                break;
            }
        if (!match)
            return FALSE;
    }

    /* All the entries in the list matched the attribute */
    return TRUE;
}

/*
 * Classes without any Match statements match all devices. Otherwise, all
 * statements must match.
 */
static Bool
InputClassMatches(const XF86ConfInputClassPtr iclass, const InputInfoPtr idev,
                  const InputAttributes *attrs)
{
    /* MatchProduct substring */
    if (!MatchAttrToken(attrs->product, &iclass->match_product, match_substring))
        return FALSE;

    /* MatchVendor substring */
    if (!MatchAttrToken(attrs->vendor, &iclass->match_vendor, match_substring))
        return FALSE;

    /* MatchDevicePath pattern */
    if (!MatchAttrToken(attrs->device, &iclass->match_device, match_path_pattern))
        return FALSE;

    /* MatchOS case-insensitive string */
    if (!MatchAttrToken(HostOS(), &iclass->match_os, strcasecmp))
        return FALSE;

    /* MatchPnPID pattern */
    if (!MatchAttrToken(attrs->pnp_id, &iclass->match_pnpid, match_pattern))
        return FALSE;

    /* MatchUSBID pattern */
    if (!MatchAttrToken(attrs->usb_id, &iclass->match_usbid, match_pattern))
        return FALSE;

    /* MatchDriver string */
    if (!MatchAttrToken(idev->driver, &iclass->match_driver, strcmp))
        return FALSE;

    /*
     * MatchTag string
     * See if any of the device's tags match any of the MatchTag tokens.
     */
    if (!list_is_empty(&iclass->match_tag)) {
        char * const *tag;
        Bool match;

        if (!attrs->tags)
            return FALSE;
        for (tag = attrs->tags, match = FALSE; *tag; tag++) {
            if (MatchAttrToken(*tag, &iclass->match_tag, strcmp)) {
                match = TRUE;
                break;
            }
        }
        if (!match)
            return FALSE;
    }

    /* MatchIs* booleans */
    if (iclass->is_keyboard.set &&
        iclass->is_keyboard.val != !!(attrs->flags & ATTR_KEYBOARD))
        return FALSE;
    if (iclass->is_pointer.set &&
        iclass->is_pointer.val != !!(attrs->flags & ATTR_POINTER))
        return FALSE;
    if (iclass->is_joystick.set &&
        iclass->is_joystick.val != !!(attrs->flags & ATTR_JOYSTICK))
        return FALSE;
    if (iclass->is_tablet.set &&
        iclass->is_tablet.val != !!(attrs->flags & ATTR_TABLET))
        return FALSE;
    if (iclass->is_touchpad.set &&
        iclass->is_touchpad.val != !!(attrs->flags & ATTR_TOUCHPAD))
        return FALSE;
    if (iclass->is_touchscreen.set &&
        iclass->is_touchscreen.val != !!(attrs->flags & ATTR_TOUCHSCREEN))
        return FALSE;

    return TRUE;
}

/*
 * Merge in any InputClass configurations. Options in each InputClass
 * section have more priority than the original device configuration as
 * well as any previous InputClass sections.
 */
static int
MergeInputClasses(const InputInfoPtr idev, const InputAttributes *attrs)
{
    XF86ConfInputClassPtr cl;
    XF86OptionPtr classopts;

    for (cl = xf86configptr->conf_inputclass_lst; cl; cl = cl->list.next) {
        if (!InputClassMatches(cl, idev, attrs))
            continue;

        /* Collect class options and driver settings */
        classopts = xf86optionListDup(cl->option_lst);
        if (cl->driver) {
            free(idev->driver);
            idev->driver = xstrdup(cl->driver);
            if (!idev->driver) {
                xf86Msg(X_ERROR, "Failed to allocate memory while merging "
                        "InputClass configuration");
                return BadAlloc;
            }
            classopts = xf86ReplaceStrOption(classopts, "driver",
                                             idev->driver);
        }

        /* Apply options to device with InputClass settings preferred. */
        xf86Msg(X_CONFIG, "%s: Applying InputClass \"%s\"\n",
                idev->name, cl->identifier);
        idev->options = xf86optionListMerge(idev->options, classopts);
    }

    return Success;
}

/*
 * Iterate the list of classes and look for Option "Ignore". Return the
 * value of the last matching class and holler when returning TRUE.
 */
static Bool
IgnoreInputClass(const InputInfoPtr idev, const InputAttributes *attrs)
{
    XF86ConfInputClassPtr cl;
    Bool ignore = FALSE;
    const char *ignore_class;

    for (cl = xf86configptr->conf_inputclass_lst; cl; cl = cl->list.next) {
        if (!InputClassMatches(cl, idev, attrs))
            continue;
        if (xf86findOption(cl->option_lst, "Ignore")) {
            ignore = xf86CheckBoolOption(cl->option_lst, "Ignore", FALSE);
            ignore_class = cl->identifier;
        }
    }

    if (ignore)
        xf86Msg(X_CONFIG, "%s: Ignoring device from InputClass \"%s\"\n",
                idev->name, ignore_class);
    return ignore;
}

InputInfoPtr
xf86AllocateInput(void)
{
    InputInfoPtr pInfo;

    pInfo = calloc(sizeof(*pInfo), 1);
    if (!pInfo)
        return NULL;

    pInfo->fd = -1;
    pInfo->type_name = "UNKNOWN";

    return pInfo;
}

/* Append InputInfoRec to the tail of xf86InputDevs. */
static void
xf86AddInput(InputDriverPtr drv, InputInfoPtr pInfo)
{
    InputInfoPtr *prev = NULL;

    pInfo->drv = drv;
    pInfo->module = DuplicateModule(drv->module, NULL);

    for (prev = &xf86InputDevs; *prev; prev = &(*prev)->next)
        ;

    *prev = pInfo;
    pInfo->next = NULL;

    xf86CollectInputOptions(pInfo, (const char**)drv->default_options);
    xf86OptionListReport(pInfo->options);
    xf86ProcessCommonOptions(pInfo, pInfo->options);
}

/*
 * Remove an entry from xf86InputDevs and free all the device's information.
 */
void
xf86DeleteInput(InputInfoPtr pInp, int flags)
{
    /* First check if the inputdev is valid. */
    if (pInp == NULL)
	return;

    if (pInp->module)
	UnloadModule(pInp->module);

    /* This should *really* be handled in drv->UnInit(dev) call instead, but
     * if the driver forgets about it make sure we free it or at least crash
     * with flying colors */
    free(pInp->private);

    FreeInputAttributes(pInp->attrs);

    /* Remove the entry from the list. */
    if (pInp == xf86InputDevs)
	xf86InputDevs = pInp->next;
    else {
	InputInfoPtr p = xf86InputDevs;
	while (p && p->next != pInp)
	    p = p->next;
	if (p)
	    p->next = pInp->next;
	/* Else the entry wasn't in the xf86InputDevs list (ignore this). */
    }

    free(pInp->driver);
    free(pInp->name);
    xf86optionListFree(pInp->options);
    free(pInp);
}

/*
 * Apply backend-specific initialization. Invoked after ActiveteDevice(),
 * i.e. after the driver successfully completed DEVICE_INIT and the device
 * is advertised.
 * @param dev the device
 * @return Success or an error code
 */
static int
xf86InputDevicePostInit(DeviceIntPtr dev) {
    ApplyAccelerationSettings(dev);
    return Success;
}

/**
 * Create a new input device, activate and enable it.
 *
 * Possible return codes:
 *    BadName .. a bad driver name was supplied.
 *    BadImplementation ... The driver does not have a PreInit function. This
 *                          is a driver bug.
 *    BadMatch .. device initialization failed.
 *    BadAlloc .. too many input devices
 *
 * @param idev The device, already set up with identifier, driver, and the
 * options.
 * @param pdev Pointer to the new device, if Success was reported.
 * @param enable Enable the device after activating it.
 *
 * @return Success or an error code
 */
_X_INTERNAL int
xf86NewInputDevice(InputInfoPtr pInfo, DeviceIntPtr *pdev, BOOL enable)
{
    InputDriverPtr drv = NULL;
    DeviceIntPtr dev = NULL;
    int rval;

    /* Memory leak for every attached device if we don't
     * test if the module is already loaded first */
    drv = xf86LookupInputDriver(pInfo->driver);
    if (!drv)
        if (xf86LoadOneModule(pInfo->driver, NULL))
            drv = xf86LookupInputDriver(pInfo->driver);
    if (!drv) {
        xf86Msg(X_ERROR, "No input driver matching `%s'\n", pInfo->driver);
        rval = BadName;
        goto unwind;
    }

    if (!drv->PreInit) {
        xf86Msg(X_ERROR,
                "Input driver `%s' has no PreInit function (ignoring)\n",
                drv->driverName);
        rval = BadImplementation;
        goto unwind;
    }

    xf86AddInput(drv, pInfo);

    rval = drv->PreInit(drv, pInfo, 0);

    if (rval != Success) {
        xf86Msg(X_ERROR, "PreInit returned %d for \"%s\"\n", rval, pInfo->name);
        goto unwind;
    }

    if (!(dev = xf86ActivateDevice(pInfo)))
    {
        rval = BadAlloc;
        goto unwind;
    }

    rval = ActivateDevice(dev, TRUE);
    if (rval != Success)
    {
        xf86Msg(X_ERROR, "Couldn't init device \"%s\"\n", pInfo->name);
        RemoveDevice(dev, TRUE);
        goto unwind;
    }

    rval = xf86InputDevicePostInit(dev);
    if (rval != Success)
    {
	xf86Msg(X_ERROR, "Couldn't post-init device \"%s\"\n", pInfo->name);
	RemoveDevice(dev, TRUE);
	goto unwind;
    }

    /* Enable it if it's properly initialised and we're currently in the VT */
    if (enable && dev->inited && dev->startup && xf86Screens[0]->vtSema)
    {
        OsBlockSignals();
        EnableDevice(dev, TRUE);
        if (!dev->enabled)
        {
            OsReleaseSignals();
            xf86Msg(X_ERROR, "Couldn't init device \"%s\"\n", pInfo->name);
            rval = BadMatch;
            goto unwind;
        }
        /* send enter/leave event, update sprite window */
        CheckMotion(NULL, dev);
        OsReleaseSignals();
    }

    *pdev = dev;
    return Success;

unwind:
    if(pInfo) {
        if(drv && drv->UnInit)
            drv->UnInit(drv, pInfo, 0);
        else
            xf86DeleteInput(pInfo, 0);
    }
    return rval;
}

int
NewInputDeviceRequest (InputOption *options, InputAttributes *attrs,
                       DeviceIntPtr *pdev)
{
    InputInfoPtr pInfo = NULL;
    InputOption *option = NULL;
    int rval = Success;
    int is_auto = 0;

    pInfo = xf86AllocateInput();
    if (!pInfo)
        return BadAlloc;

    for (option = options; option; option = option->next) {
        if (strcasecmp(option->key, "driver") == 0) {
            if (pInfo->driver) {
                rval = BadRequest;
                goto unwind;
            }
            pInfo->driver = xstrdup(option->value);
            if (!pInfo->driver) {
                rval = BadAlloc;
                goto unwind;
            }
        }

        if (strcasecmp(option->key, "name") == 0 ||
            strcasecmp(option->key, "identifier") == 0) {
            if (pInfo->name) {
                rval = BadRequest;
                goto unwind;
            }
            pInfo->name = xstrdup(option->value);
            if (!pInfo->name) {
                rval = BadAlloc;
                goto unwind;
            }
        }

        if (strcmp(option->key, "_source") == 0 &&
            (strcmp(option->value, "server/hal") == 0 ||
             strcmp(option->value, "server/udev") == 0)) {
            is_auto = 1;
            if (!xf86Info.autoAddDevices) {
                rval = BadMatch;
                goto unwind;
            }
        }
    }

    for (option = options; option; option = option->next) {
        /* Steal option key/value strings from the provided list.
         * We need those strings, the InputOption list doesn't. */
        pInfo->options = xf86addNewOption(pInfo->options,
                                               option->key, option->value);
        option->key = NULL;
        option->value = NULL;
    }

    /* Apply InputClass settings */
    if (attrs) {
        if (IgnoreInputClass(pInfo, attrs)) {
            rval = BadIDChoice;
            goto unwind;
        }

        rval = MergeInputClasses(pInfo, attrs);
        if (rval != Success)
            goto unwind;

        pInfo->attrs = DuplicateInputAttributes(attrs);
    }

    if (!pInfo->driver || !pInfo->name) {
        xf86Msg(X_INFO, "No input driver/identifier specified (ignoring)\n");
        rval = BadRequest;
        goto unwind;
    }

    if (!pInfo->name) {
        xf86Msg(X_ERROR, "No device identifier specified (ignoring)\n");
        rval = BadMatch;
        goto unwind;
    }

    rval = xf86NewInputDevice(pInfo, pdev,
                (!is_auto || (is_auto && xf86Info.autoEnableDevices)));

    return rval;

unwind:
    if (is_auto && !xf86Info.autoAddDevices)
        xf86Msg(X_INFO, "AutoAddDevices is off - not adding device.\n");
    xf86DeleteInput(pInfo, 0);
    return rval;
}

void
DeleteInputDeviceRequest(DeviceIntPtr pDev)
{
    InputInfoPtr pInfo = (InputInfoPtr) pDev->public.devicePrivate;
    InputDriverPtr drv = NULL;
    Bool isMaster = IsMaster(pDev);

    if (pInfo) /* need to get these before RemoveDevice */
        drv = pInfo->drv;

    OsBlockSignals();
    RemoveDevice(pDev, TRUE);

    if (!isMaster && pInfo != NULL)
    {
        if(drv->UnInit)
            drv->UnInit(drv, pInfo, 0);
        else
            xf86DeleteInput(pInfo, 0);
    }
    OsReleaseSignals();
}

/* 
 * convenient functions to post events
 */

void
xf86PostMotionEvent(DeviceIntPtr	device,
                    int			is_absolute,
                    int			first_valuator,
                    int			num_valuators,
                    ...)
{
    va_list var;
    int i = 0;
    ValuatorMask mask;

    XI_VERIFY_VALUATORS(num_valuators);

    valuator_mask_zero(&mask);
    va_start(var, num_valuators);
    for (i = 0; i < num_valuators; i++)
        valuator_mask_set(&mask, first_valuator + i, va_arg(var, int));
    va_end(var);

    xf86PostMotionEventM(device, is_absolute, &mask);
}

void
xf86PostMotionEventP(DeviceIntPtr	device,
                    int			is_absolute,
                    int			first_valuator,
                    int			num_valuators,
                    const int		*valuators)
{
    ValuatorMask mask;

    XI_VERIFY_VALUATORS(num_valuators);

    valuator_mask_set_range(&mask, first_valuator, num_valuators, valuators);
    xf86PostMotionEventM(device, is_absolute, &mask);
}

void
xf86PostMotionEventM(DeviceIntPtr	device,
                     int		is_absolute,
                     const ValuatorMask	*mask)
{
    int i = 0, nevents = 0;
    DeviceEvent *event;
    int flags = 0;

    if (valuator_mask_num_valuators(mask) > 0)
    {
        if (is_absolute)
            flags = POINTER_ABSOLUTE;
        else
            flags = POINTER_RELATIVE | POINTER_ACCELERATE;
    }

#if XFreeXDGA
    /* The evdev driver may not always send all axes across. */
    if (valuator_mask_isset(mask, 0) ||
        valuator_mask_isset(mask, 1))
        if (miPointerGetScreen(device)) {
            int index = miPointerGetScreen(device)->myNum;
            int dx = 0, dy = 0;

            if (valuator_mask_isset(mask, 0))
            {
                dx = valuator_mask_get(mask, 0);
                if (is_absolute)
                    dx -= device->last.valuators[0];
            }

            if (valuator_mask_isset(mask, 1))
            {
                dy = valuator_mask_get(mask, 1);
                if (is_absolute)
                    dy -= device->last.valuators[1];
            }

            if (DGAStealMotionEvent(device, index, dx, dy))
                return;
        }
#endif

    nevents = GetPointerEvents(xf86Events, device, MotionNotify, 0, flags, mask);

    for (i = 0; i < nevents; i++) {
        event = (DeviceEvent*)((xf86Events + i)->event);
        mieqEnqueue(device, (InternalEvent*)((xf86Events + i)->event));
    }
}

void
xf86PostProximityEvent(DeviceIntPtr	device,
                       int		is_in,
                       int		first_valuator,
                       int		num_valuators,
                       ...)
{
    va_list var;
    int i;
    ValuatorMask mask;

    XI_VERIFY_VALUATORS(num_valuators);

    valuator_mask_zero(&mask);
    va_start(var, num_valuators);
    for (i = 0; i < num_valuators; i++)
        valuator_mask_set(&mask, first_valuator + i, va_arg(var, int));
    va_end(var);

    xf86PostProximityEventM(device, is_in, &mask);
}

void
xf86PostProximityEventP(DeviceIntPtr	device,
                        int		is_in,
                        int		first_valuator,
                        int		num_valuators,
                        const int	*valuators)
{
    ValuatorMask mask;

    XI_VERIFY_VALUATORS(num_valuators);

    valuator_mask_set_range(&mask, first_valuator, num_valuators, valuators);
    xf86PostProximityEventM(device, is_in, &mask);
}

void
xf86PostProximityEventM(DeviceIntPtr	device,
                        int		is_in,
                        const ValuatorMask *mask)
{
    int i, nevents;

    nevents = GetProximityEvents(xf86Events, device,
                                 is_in ? ProximityIn : ProximityOut, mask);
    for (i = 0; i < nevents; i++)
        mieqEnqueue(device, (InternalEvent*)((xf86Events + i)->event));

}

void
xf86PostButtonEvent(DeviceIntPtr	device,
                    int			is_absolute,
                    int			button,
                    int			is_down,
                    int			first_valuator,
                    int			num_valuators,
                    ...)
{
    va_list var;
    ValuatorMask mask;
    int i = 0;

    XI_VERIFY_VALUATORS(num_valuators);

    valuator_mask_zero(&mask);

    va_start(var, num_valuators);
    for (i = 0; i < num_valuators; i++)
        valuator_mask_set(&mask, first_valuator + i, va_arg(var, int));
    va_end(var);

    xf86PostButtonEventM(device, is_absolute, button, is_down, &mask);
}

void
xf86PostButtonEventP(DeviceIntPtr	device,
                     int		is_absolute,
                     int		button,
                     int		is_down,
                     int		first_valuator,
                     int		num_valuators,
                     const int		*valuators)
{
    ValuatorMask mask;

    XI_VERIFY_VALUATORS(num_valuators);

    valuator_mask_set_range(&mask, first_valuator, num_valuators, valuators);
    xf86PostButtonEventM(device, is_absolute, button, is_down, &mask);
}

void
xf86PostButtonEventM(DeviceIntPtr	device,
                     int		is_absolute,
                     int		button,
                     int		is_down,
                     const ValuatorMask	*mask)
{
    int i = 0, nevents = 0;
    int flags = 0;

    if (valuator_mask_num_valuators(mask) > 0)
    {
        if (is_absolute)
            flags = POINTER_ABSOLUTE;
        else
            flags = POINTER_RELATIVE | POINTER_ACCELERATE;
    }

#if XFreeXDGA
    if (miPointerGetScreen(device)) {
        int index = miPointerGetScreen(device)->myNum;

        if (DGAStealButtonEvent(device, index, button, is_down))
            return;
    }
#endif

    nevents = GetPointerEvents(xf86Events, device,
                               is_down ? ButtonPress : ButtonRelease, button,
                               flags, mask);

    for (i = 0; i < nevents; i++)
        mieqEnqueue(device, (InternalEvent*)((xf86Events + i)->event));

}

void
xf86PostKeyEvent(DeviceIntPtr	device,
                 unsigned int	key_code,
                 int		is_down,
                 int		is_absolute,
                 int		first_valuator,
                 int		num_valuators,
                 ...)
{
    va_list var;
    int i = 0;
    ValuatorMask mask;

    XI_VERIFY_VALUATORS(num_valuators);

    valuator_mask_zero(&mask);

    va_start(var, num_valuators);
    for (i = 0; i < num_valuators; i++)
        valuator_mask_set(&mask, first_valuator + i, va_arg(var, int));
    va_end(var);

    xf86PostKeyEventM(device, key_code, is_down, is_absolute, &mask);
}

void
xf86PostKeyEventP(DeviceIntPtr	device,
                  unsigned int	key_code,
                  int		is_down,
                  int		is_absolute,
                  int		first_valuator,
                  int		num_valuators,
                  const int	*valuators)
{
    ValuatorMask mask;

    XI_VERIFY_VALUATORS(num_valuators);

    valuator_mask_set_range(&mask, first_valuator, num_valuators, valuators);
    xf86PostKeyEventM(device, key_code, is_down, is_absolute, &mask);
}

void
xf86PostKeyEventM(DeviceIntPtr	device,
                  unsigned int	key_code,
                  int		is_down,
                  int		is_absolute,
                  const ValuatorMask *mask)
{
    int i = 0, nevents = 0;

#if XFreeXDGA
    DeviceIntPtr pointer;

    /* Some pointers send key events, paired device is wrong then. */
    pointer = IsPointerDevice(device) ? device : GetPairedDevice(device);
    if (miPointerGetScreen(pointer)) {
        int index = miPointerGetScreen(pointer)->myNum;

        if (DGAStealKeyEvent(device, index, key_code, is_down))
            return;
    }
#endif

    if (is_absolute) {
        nevents = GetKeyboardValuatorEvents(xf86Events, device,
                                            is_down ? KeyPress : KeyRelease,
                                            key_code, mask);
    }
    else {
        nevents = GetKeyboardEvents(xf86Events, device,
                                    is_down ? KeyPress : KeyRelease,
                                    key_code);
    }

    for (i = 0; i < nevents; i++)
        mieqEnqueue(device, (InternalEvent*)((xf86Events + i)->event));
}

void
xf86PostKeyboardEvent(DeviceIntPtr      device,
                      unsigned int      key_code,
                      int               is_down)
{
    ValuatorMask mask;

    valuator_mask_zero(&mask);
    xf86PostKeyEventM(device, key_code, is_down, 0, &mask);
}

InputInfoPtr
xf86FirstLocalDevice(void)
{
    return xf86InputDevs;
}

/* 
 * Cx     - raw data from touch screen
 * to_max - scaled highest dimension
 *          (remember, this is of rows - 1 because of 0 origin)
 * to_min  - scaled lowest dimension
 * from_max - highest raw value from touch screen calibration
 * from_min  - lowest raw value from touch screen calibration
 *
 * This function is the same for X or Y coordinates.
 * You may have to reverse the high and low values to compensate for
 * different orgins on the touch screen vs X.
 *
 * e.g. to scale from device coordinates into screen coordinates, call
 * xf86ScaleAxis(x, 0, screen_width, dev_min, dev_max);
 */

int
xf86ScaleAxis(int	Cx,
              int	to_max,
              int	to_min,
              int	from_max,
              int	from_min )
{
    int X;
    int64_t to_width = to_max - to_min;
    int64_t from_width = from_max - from_min;

    if (from_width) {
	X = (int)(((to_width * (Cx - from_min)) / from_width) + to_min);
    }
    else {
	X = 0;
	ErrorF ("Divide by Zero in xf86ScaleAxis\n");
    }
    
    if (X > to_max)
	X = to_max;
    if (X < to_min)
	X = to_min;
    
    return X;
}

/*
 * This function checks the given screen against the current screen and
 * makes changes if appropriate. It should be called from an XInput driver's
 * ReadInput function before any events are posted, if the device is screen
 * specific like a touch screen.
 */
void
xf86XInputSetScreen(InputInfoPtr	pInfo,
		    int			screen_number,
		    int			x,
		    int			y)
{
    if (miPointerGetScreen(pInfo->dev) !=
          screenInfo.screens[screen_number]) {
	miPointerSetScreen(pInfo->dev, screen_number, x, y);
    }
}


void
xf86InitValuatorAxisStruct(DeviceIntPtr dev, int axnum, Atom label, int minval, int maxval,
			   int resolution, int min_res, int max_res, int mode)
{
    if (!dev || !dev->valuator)
        return;

    InitValuatorAxisStruct(dev, axnum, label, minval, maxval, resolution, min_res,
			   max_res, mode);
}

/*
 * Set the valuator values to be in synch with dix/event.c
 * DefineInitialRootWindow().
 */
void
xf86InitValuatorDefaults(DeviceIntPtr dev, int axnum)
{
    if (axnum == 0) {
	dev->valuator->axisVal[0] = screenInfo.screens[0]->width / 2;
        dev->last.valuators[0] = dev->valuator->axisVal[0];
    }
    else if (axnum == 1) {
	dev->valuator->axisVal[1] = screenInfo.screens[0]->height / 2;
        dev->last.valuators[1] = dev->valuator->axisVal[1];
    }
}


/**
 * Deactivate a device. Call this function from the driver if you receive a
 * read error or something else that spoils your day.
 * Device will be moved to the off_devices list, but it will still be there
 * until you really clean up after it.
 * Notifies the client about an inactive device.
 * 
 * @param panic True if device is unrecoverable and needs to be removed.
 */
void
xf86DisableDevice(DeviceIntPtr dev, Bool panic)
{
    if(!panic)
    {
        DisableDevice(dev, TRUE);
    } else
    {
        SendDevicePresenceEvent(dev->id, DeviceUnrecoverable);
        DeleteInputDeviceRequest(dev);
    }
}

/**
 * Reactivate a device. Call this function from the driver if you just found
 * out that the read error wasn't quite that bad after all.
 * Device will be re-activated, and an event sent to the client. 
 */
void
xf86EnableDevice(DeviceIntPtr dev)
{
    EnableDevice(dev, TRUE);
}

/* end of xf86Xinput.c */