summaryrefslogtreecommitdiffstats
path: root/scripts/dtc/dt_to_config
blob: 9a248b505c58572e8012808fba6d5b4bdf494c85 (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
#!/usr/bin/perl

# Copyright 2016 by Frank Rowand
# Copyright 2016 by Gaurav Minocha
#
# This file is subject to the terms and conditions of the GNU General Public
# License v2.

use strict 'refs';
use strict subs;

use Getopt::Long;

$VUFX = "160610a";

$script_name = $0;
$script_name =~ s|^.*/||;


# ----- constants for print_flags()

# Position in string $pr_flags.  Range of 0..($num_pr_flags - 1).
$pr_flag_pos_mcompatible       = 0;
$pr_flag_pos_driver            = 1;
$pr_flag_pos_mdriver           = 2;
$pr_flag_pos_config            = 3;
$pr_flag_pos_mconfig           = 4;
$pr_flag_pos_node_not_enabled  = 5;
$pr_flag_pos_white_list        = 6;
$pr_flag_pos_hard_coded        = 7;
$pr_flag_pos_config_hard_coded = 8;
$pr_flag_pos_config_none       = 9;
$pr_flag_pos_config_m          = 10;
$pr_flag_pos_config_y          = 11;
$pr_flag_pos_config_test_fail  = 12;

$num_pr_flags = $pr_flag_pos_config_test_fail + 1;

# flags in @pr_flag_value must be unique values to allow simple regular
# expessions to work for --include_flags and --exclude_flags.
# Convention: use upper case letters for potential issues or problems.

@pr_flag_value = ('M', 'd', 'D', 'c', 'C', 'E', 'W', 'H', 'x', 'n', 'm', 'y', 'F');

@pr_flag_help = (
    "multiple compatibles found for this node",
    "driver found for this compatible",
    "multiple drivers found for this compatible",
    "kernel config found for this driver",
    "multiple config options found for this driver",
    "node is not enabled",
    "compatible is white listed",
    "matching driver and/or kernel config is hard coded",
    "kernel config hard coded in Makefile",
    "one or more kernel config file options is not set",
    "one or more kernel config file options is set to 'm'",
    "one or more kernel config file options is set to 'y'",
    "one of more kernel config file options fails to have correct value"
);


# -----

%driver_config = ();   # driver config array, indexed by driver source file
%driver_count = ();    # driver_cnt, indexed by compatible
%compat_driver = ();   # compatible driver array, indexed by compatible
%existing_config = (); # existing config symbols present in given config file
                       # expected values are: "y", "m", a decimal number, a
                       # hex number, or a string

# ----- magic compatibles, do not have a driver
#
# Will not search for drivers for these compatibles.

%compat_white_list = (
       'none'                  => '1',
       'pci'                   => '1',
       'simple-bus'            => '1',
);

# Will not search for drivers for these compatibles.
#
# These compatibles have a very large number of false positives.
#
# 'hardcoded_no_driver' is a magic value.  Other code knows this
# magic value.  Do not use 'no_driver' here!
#
# Revisit each 'hardcoded_no_driver' to see how the compatible
# is used.  Are there drivers that can be provided?

%driver_hard_code_list = (
       'cache'                 => ['hardcoded_no_driver'],
       'eeprom'                => ['hardcoded_no_driver'],
       'gpio'                  => ['hardcoded_no_driver'],
       'gpio-keys'             => ['drivers/input/keyboard/gpio_keys.c'],
       'i2c-gpio'              => ['drivers/i2c/busses/i2c-gpio.c'],
       'isa'                   => ['arch/mips/mti-malta/malta-dt.c',
                                    'arch/x86/kernel/devicetree.c'],
       'led'                   => ['hardcoded_no_driver'],
       'm25p32'                => ['hardcoded_no_driver'],
       'm25p64'                => ['hardcoded_no_driver'],
       'm25p80'                => ['hardcoded_no_driver'],
       'mtd-ram'               => ['drivers/mtd/maps/physmap_of.c'],
       'pwm-backlight'         => ['drivers/video/backlight/pwm_bl.c'],
       'spidev'                => ['hardcoded_no_driver'],
       'syscon'                => ['drivers/mfd/syscon.c'],
       'tlv320aic23'           => ['hardcoded_no_driver'],
       'wm8731'                => ['hardcoded_no_driver'],
);

# Use these config options instead of searching makefiles

%driver_config_hard_code_list = (

       # this one needed even if %driver_hard_code_list is empty
       'no_driver'                             => ['no_config'],
       'hardcoded_no_driver'                   => ['no_config'],

       # drivers/usb/host/ehci-ppc-of.c
       # drivers/usb/host/ehci-xilinx-of.c
       #  are included from:
       #    drivers/usb/host/ehci-hcd.c
       #  thus the search of Makefile for the included .c files is incorrect
       # ehci-hcd.c wraps the includes with ifdef CONFIG_USB_EHCI_HCD_..._OF
       #
       # similar model for ohci-hcd.c (but no ohci-xilinx-of.c)
       #
       # similarly, uhci-hcd.c includes uhci-platform.c

       'drivers/usb/host/ehci-ppc-of.c'        => ['CONFIG_USB_EHCI_HCD',
                                                   'CONFIG_USB_EHCI_HCD_PPC_OF'],
       'drivers/usb/host/ohci-ppc-of.c'        => ['CONFIG_USB_OHCI_HCD',
                                                   'CONFIG_USB_OHCI_HCD_PPC_OF'],

       'drivers/usb/host/ehci-xilinx-of.c'     => ['CONFIG_USB_EHCI_HCD',
                                                   'CONFIG_USB_EHCI_HCD_XILINX'],

       'drivers/usb/host/uhci-platform.c'      => ['CONFIG_USB_UHCI_HCD',
                                                   'CONFIG_USB_UHCI_PLATFORM'],

       # scan_makefile will find only one of these config options:
       #    ifneq ($(CONFIG_SOC_IMX6)$(CONFIG_SOC_LS1021A),)
       'arch/arm/mach-imx/platsmp.c'           => ['CONFIG_SOC_IMX6 && CONFIG_SMP',
                                                   'CONFIG_SOC_LS1021A && CONFIG_SMP'],
);


# 'virt/kvm/arm/.*' are controlled by makefiles in other directories,
# using relative paths, such as 'KVM := ../../../virt/kvm'.  Do not
# add complexity to find_kconfig() to deal with this.  There is a long
# term intent to change the kvm related makefiles to the normal kernel
# style.  After that is done, this entry can be removed from the
# black_list_driver.

@black_list_driver = (
       # kvm no longer a problem after commit 503a62862e8f in 4.7-rc1
       # 'virt/kvm/arm/.*',
);


sub usage()
{
       print
"
Usage: $script_name [options] device-tree...

    device_tree is: dts_file | dtb_file | proc_device-tree


Valid options:
     -c FILE             Read kernel config options from FILE
    --config FILE        synonym for 'c'
    --config-format      config file friendly output format
    --exclude-flag FLAG  exclude entries with a matching flag
     -h                  Display this message and exit
    --help               synonym for 'h'
    --black-list-driver  use driver black list
    --white-list-config  use config white list
    --white-list-driver  use driver white list
    --include-flag FLAG  include only entries with a matching flag
    --include-suspect    include only entries with an uppercase flag
    --short-name         do not show the path portion of the node name
    --show-lists         report of white and black lists
    --version            Display program version and exit


  Report driver source files that match the compatibles in the device
  tree file and the kernel config options that enable the driver source
  files.

  This program must be run in the root directory of a Linux kernel
  source tree.

  The default format is a report that is intended to be easily human
  scannable.

  An alternate format can be selected by --config-format.  This will
  create output that can easily be edited to create a fragment that can
  be appended to the existing kernel config file.  Each entry consists of
  multiple lines.  The first line reports flags, the node path, compatible
  value, driver file matching the compatible, configuration options, and
  current values of the configuration options.  For each configuration
  option, the following lines report the current value and the value that
  is required for the driver file to be included in the kernel.

  If a large number of drivers or config options is listed for a node,
  and the '$pr_flag_value[$pr_flag_pos_hard_coded]' flag is set consider using --white-list-config and/or
  --white-list-driver.  If the white list option suppresses the correct
  entry please report that as a bug.

  CAUTION:
     This program uses heuristics to guess which driver(s) support each
     compatible string and which config option(s) enables the driver(s).
     Do not believe that the reported information is fully correct.
     This program is intended to aid the process of determining the
     proper kernel configuration for a device tree, but this is not
     a fully automated process -- human involvement may still be
     required!

     The driver match heuristic used is to search for source files
     containing the compatible string enclosed in quotes.

     This program might not be able to find all drivers matching a
     compatible string.

     Some makefiles are overly clever.  This program was not made
     complex enough to handle them.  If no config option is listed
     for a driver, look at the makefile for the driver source file.
     Even if a config option is listed for a driver, some other
     available config options may not be listed.

  FLAG values:
";

       for ($k = 0; $k < $num_pr_flags; $k++) {
               printf "     %s   %s\n", $pr_flag_value[$k], $pr_flag_help[$k];
       }

       print
"
     Upper case letters indicate potential issues or problems.

  The flag:

";

       $k = $pr_flag_pos_hard_coded;
       printf "     %s   %s\n", $pr_flag_value[$k], $pr_flag_help[$k];

       print
"
  will be set if the config or driver is in the white lists, even if
  --white-list-config and --white-list-driver are not specified.
  This is a hint that 1) many of these reported lines are likely to
  be incorrect, and 2) using those options will reduce the number of
  drivers and/or config options reported.

  --white-list-config and --white-list-driver may not be accurate if this
  program is not well maintained.  Use them with appropriate skepticism.
  Use the --show-lists option to report the values in the list.

  Return value:
    0   if no error
    1   error processing command line
    2   unable to open or read kernel config file
    3   unable to open or process input device tree file(s)

  EXAMPLES:

     dt_to_config arch/arm/boot/dts/my_dts_file.dts

       Basic report.

     dt_to_config \\
        --config \${KBUILD_OUTPUT}/.config \\
        arch/\${ARCH}/boot/dts/my_dts_file.dts

       Full report, with config file issues noted.

     dt_to_config --include-suspect \\
        --config \${KBUILD_OUTPUT}/.config \\
        arch/\${ARCH}/boot/dts/my_dts_file.dts

       Report of node / compatible string / driver tuples that should
       be further investigated.  A node may have multiple compatible
       strings.  A compatible string may be matched by multiple drivers.
       A driver may have config file issues noted.  The compatible string
       and/or driver may be in the white lists.

     dt_to_config --include-suspect --config-format \\
        --config ${KBUILD_OUTPUT}/.config \\
        arch/\${ARCH}/boot/dts/my_dts_file.dts

       Report of node / compatible string / driver tuples that should
       be further investigated.  The report can be edited to uncomment
       the config options to select the desired tuple for a given node.
       A node may have multiple compatible strings.  A compatible string
       may be matched by multiple drivers.  A driver may have config file
       issues noted.  The compatible string and/or driver may be in the
       white lists.

";
}

sub set_flag()
{
       # pr_flags_ref is a reference to $pr_flags

       my $pr_flags_ref = shift;
       my $pos          = shift;

       substr $$pr_flags_ref, $pos, 1, $pr_flag_value[$pos];

       return $pr_flags;
}

sub print_flags()
{
       # return 1 if anything printed, else 0

       # some fields of pn_arg_ref might not be used in this function, but
       # extract all of them anyway.
       my $pn_arg_ref     = shift;

       my $compat         = $pn_arg_ref->{compat};
       my $compatible_cnt = $pn_arg_ref->{compatible_cnt};
       my $config         = $pn_arg_ref->{config};
       my $config_cnt     = $pn_arg_ref->{config_cnt};
       my $driver         = $pn_arg_ref->{driver};
       my $driver_cnt     = $pn_arg_ref->{driver_cnt};
       my $full_node      = $pn_arg_ref->{full_node};
       my $node           = $pn_arg_ref->{node};
       my $node_enabled   = $pn_arg_ref->{node_enabled};
       my $white_list     = $pn_arg_ref->{white_list};

       my $pr_flags       = '-' x $num_pr_flags;


       # ----- set flags in $pr_flags

       if ($compatible_cnt > 1) {
               &set_flag(\$pr_flags, $pr_flag_pos_mcompatible);
       }

       if ($config_cnt > 1) {
               &set_flag(\$pr_flags, $pr_flag_pos_mconfig);
       }

       if ($driver_cnt >= 1) {
               &set_flag(\$pr_flags, $pr_flag_pos_driver);
       }

       if ($driver_cnt > 1) {
               &set_flag(\$pr_flags, $pr_flag_pos_mdriver);
       }

       # These strings are the same way the linux kernel tests.
       # The ePapr lists of values is slightly different.
       if (!(
             ($node_enabled eq "") ||
             ($node_enabled eq "ok") ||
             ($node_enabled eq "okay")
            )) {
               &set_flag(\$pr_flags, $pr_flag_pos_node_not_enabled);
       }

       if ($white_list) {
               &set_flag(\$pr_flags, $pr_flag_pos_white_list);
       }

       if (exists($driver_hard_code_list{$compat}) ||
           (exists($driver_config_hard_code_list{$driver}) &&
            ($driver ne "no_driver"))) {
               &set_flag(\$pr_flags, $pr_flag_pos_hard_coded);
       }

       my @configs = split(' && ', $config);
       for $configs (@configs) {
               $not = $configs =~ /^!/;
               $configs =~ s/^!//;

               if (($configs ne "no_config") && ($configs ne "no_makefile")) {
                       &set_flag(\$pr_flags, $pr_flag_pos_config);
               }

               if (($config_cnt >= 1) &&
                   ($configs !~ /CONFIG_/) &&
                   (($configs ne "no_config") && ($configs ne "no_makefile"))) {
                       &set_flag(\$pr_flags, $pr_flag_pos_config_hard_coded);
               }

               my $existing_config = $existing_config{$configs};
               if ($existing_config eq "m") {
                       &set_flag(\$pr_flags, $pr_flag_pos_config_m);
                       # Possible fail, depends on whether built in or
                       # module is desired.
                       &set_flag(\$pr_flags, $pr_flag_pos_config_test_fail);
               } elsif ($existing_config eq "y") {
                       &set_flag(\$pr_flags, $pr_flag_pos_config_y);
                       if ($not) {
                               &set_flag(\$pr_flags, $pr_flag_pos_config_test_fail);
                       }
               } elsif (($config_file) && ($configs =~ /CONFIG_/)) {
                       &set_flag(\$pr_flags, $pr_flag_pos_config_none);
                       if (!$not) {
                               &set_flag(\$pr_flags, $pr_flag_pos_config_test_fail);
                       }
               }
       }

       # ----- include / exclude filters

       if ($include_flag_pattern && ($pr_flags !~ m/$include_flag_pattern/)) {
               return 0;
       }

       if ($exclude_flag_pattern && ($pr_flags =~ m/$exclude_flag_pattern/)) {
               return 0;
       }

       if ($config_format) {
               print "# ";
       }
       print "$pr_flags : ";

       return 1;
}


sub print_node()
{
       # return number of lines printed

       # some fields of pn_arg_ref might not be used in this function, but
       # extract all of them anyway.
       my $pn_arg_ref     = shift;

       my $compat         = $pn_arg_ref->{compat};
       my $compatible_cnt = $pn_arg_ref->{compatible_cnt};
       my $config         = $pn_arg_ref->{config};
       my $config_cnt     = $pn_arg_ref->{config_cnt};
       my $driver         = $pn_arg_ref->{driver};
       my $driver_cnt     = $pn_arg_ref->{driver_cnt};
       my $full_node      = $pn_arg_ref->{full_node};
       my $node           = $pn_arg_ref->{node};
       my $node_enabled   = $pn_arg_ref->{node_enabled};
       my $white_list     = $pn_arg_ref->{white_list};

       my $separator;

       if (! &print_flags($pn_arg_ref)) {
               return 0;
       }


       if ($short_name) {
               print "$node";
       } else {
               print "$full_node";
       }
       print " : $compat : $driver : $config : ";

       my @configs = split(' && ', $config);

       if ($config_file) {
               for $configs (@configs) {
                       $configs =~ s/^!//;
                       my $existing_config = $existing_config{$configs};
                       if (!$existing_config) {
                               # check for /-m/, /-y/, or /-objs/
                               if ($configs !~ /CONFIG_/) {
                                       $existing_config = "x";
                               };
                       };
                       if ($existing_config) {
                               print "$separator", "$existing_config";
                               $separator = ", ";
                       } else {
                               print "$separator", "n";
                               $separator = ", ";
                       }
               }
       } else {
               print "none";
       }

       print "\n";

       if ($config_format) {
               for $configs (@configs) {
                       $not = $configs =~ /^!/;
                       $configs =~ s/^!//;
                       my $existing_config = $existing_config{$configs};

                       if ($not) {
                               if ($configs !~ /CONFIG_/) {
                                       print "# $configs\n";
                               } elsif ($existing_config eq "m") {
                                       print "# $configs is m\n";
                                       print "# $configs=n\n";
                               } elsif ($existing_config eq "y") {
                                       print "# $configs is set\n";
                                       print "# $configs=n\n";
                               } else {
                                       print "# $configs is not set\n";
                                       print "# $configs=n\n";
                               }

                       } else {
                               if ($configs !~ /CONFIG_/) {
                                       print "# $configs\n";
                               } elsif ($existing_config eq "m") {
                                       print "# $configs is m\n";
                                       print "# $configs=y\n";
                               } elsif ($existing_config eq "y") {
                                       print "# $configs is set\n";
                                       print "# $configs=y\n";
                               } else {
                                       print "# $configs is not set\n";
                                       print "# $configs=y\n";
                               }
                       }
               }
       }

       return 1;
}


sub scan_makefile
{
       my $pn_arg_ref    = shift;
       my $driver        = shift;

       # ----- Find Kconfig symbols that enable driver

       my ($dir, $base) = $driver =~ m{(.*)/(.*).c};

       my $makefile = $dir . "/Makefile";
       if (! -r $makefile) {
               $makefile = $dir . "/Kbuild";
       }
       if (! -r $makefile) {
               my $config;

               $config = 'no_makefile';
               push @{ $driver_config{$driver} }, $config;
               return;
       }

       if (!open(MAKEFILE_FILE, "<", "$makefile")) {
               return;
       }

       my $line;
       my @config;
       my @if_config;
       my @make_var;

       NEXT_LINE:
       while ($next_line = <MAKEFILE_FILE>) {
               my $config;
               my $if_config;
               my $ifdef;
               my $ifeq;
               my $ifndef;
               my $ifneq;
               my $ifdef_config;
               my $ifeq_config;
               my $ifndef_config;
               my $ifneq_config;

               chomp($next_line);
               $line = $line . $next_line;
               if ($next_line =~ /\\$/) {
                       $line =~ s/\\$/ /;
                       next NEXT_LINE;
               }
               if ($line =~ /^\s*#/) {
                       $line = "";
                       next NEXT_LINE;
               }

               # -----  condition ... else ... endif

               if ($line =~ /^([ ]\s*|)else\b/) {
                       $if_config = "!" . pop @if_config;
                       $if_config =~ s/^!!//;
                       push @if_config, $if_config;
                       $line =~ s/^([ ]\s*|)else\b//;
               }

               ($null, $ifeq_config,  $ifeq_config_val )  = $line =~ /^([ ]\s*|)ifeq\b.*\b(CONFIG_[A-Za-z0-9_]*)(.*)/;
               ($null, $ifneq_config, $ifneq_config_val)  = $line =~ /^([ ]\s*|)ifneq\b.*\b(CONFIG_[A-Za-z0-9_]*)(.*)/;
               ($null, $ifdef_config)                     = $line =~ /^([ ]\s*|)ifdef\b.*\b(CONFIG_[A-Za-z0-9_]*)/;
               ($null, $ifndef_config)                    = $line =~ /^([ ]\s*|)ifndef\b.*\b(CONFIG_[A-Za-z0-9_]*)/;

               ($null, $ifeq)   = $line =~ /^([ ]\s*|)ifeq\b\s*(.*)/;
               ($null, $ifneq)  = $line =~ /^([ ]\s*|)ifneq\b\s*(.*)/;
               ($null, $ifdef)  = $line =~ /^([ ]\s*|)ifdef\b\s*(.*)/;
               ($null, $ifndef) = $line =~ /^([ ]\s*|)ifndef\b\s*(.*)/;

               # Order of tests is important.  Prefer "CONFIG_*" regex match over
               # less specific regex match.
               if ($ifdef_config) {
                       $if_config = $ifdef_config;
               } elsif ($ifeq_config) {
                       if ($ifeq_config_val =~ /y/) {
                               $if_config = $ifeq_config;
                       } else {
                               $if_config = "!" . $ifeq_config;
                       }
               } elsif ($ifndef_config) {
                       $if_config = "!" . $ifndef_config;
               } elsif ($ifneq_config) {
                       if ($ifneq_config_val =~ /y/) {
                               $if_config = "!" . $ifneq_config;
                       } else {
                               $if_config = $ifneq_config;
                       }
               } elsif ($ifdef) {
                       $if_config = $ifdef;
               } elsif ($ifeq) {
                       $if_config = $ifeq;
               } elsif ($ifndef) {
                       $if_config = "!" . $ifndef;
               } elsif ($ifneq) {
                       $if_config = "!" . $ifneq;
               } else {
                       $if_config = "";
               }
               $if_config =~ s/^!!//;

               if ($if_config) {
                       push @if_config, $if_config;
                       $line = "";
                       next NEXT_LINE;
               }

               if ($line =~ /^([ ]\s*|)endif\b/) {
                       pop @if_config;
                       $line = "";
                       next NEXT_LINE;
               }

               # ----- simple CONFIG_* = *.[co]  or  xxx [+:?]*= *.[co]
               # Most makefiles select on *.o, but
               # arch/powerpc/boot/Makefile selects on *.c

               ($config) = $line =~ /(CONFIG_[A-Za-z0-9_]+).*\b$base.[co]\b/;

               # ----- match a make variable instead of *.[co]
               # Recursively expanded variables are not handled.

               if (!$config) {
                       my $make_var;
                       ($make_var) = $line =~ /\s*(\S+?)\s*[+:\?]*=.*\b$base.[co]\b/;
                       if ($make_var) {
                               if ($make_var =~ /[a-zA-Z0-9]+-[ym]/) {
                                       $config = $make_var;
                               } elsif ($make_var =~ /[a-zA-Z0-9]+-objs/) {
                                       $config = $make_var;
                               } else {
                                       push @make_var, $make_var;
                               }
                       }
               }

               if (!$config) {
                       for $make_var (@make_var) {
                               ($config) = $line =~ /(CONFIG_[A-Za-z0-9_]+).*\b$make_var\b/;
                               last if ($config);
                       }
               }

               if (!$config) {
                       for $make_var (@make_var) {
                               ($config) = $line =~ /\s*(\S+?)\s*[+:\?]*=.*\b$make_var\b/;
                               last if ($config);
                       }
               }

               # ----- next if no config found

               if (!$config) {
                       $line = "";
                       next NEXT_LINE;
               }

               for $if_config (@if_config) {
                       $config = $if_config . " && " . $config;
               }

               push @{ $driver_config{$driver} }, $config;

               $line = "";
       }

       close(MAKEFILE_FILE);

}


sub find_kconfig
{
       my $pn_arg_ref    = shift;
       my $driver        = shift;

       my $lines_printed = 0;
       my @configs;

       if (!@{ $driver_config{$driver} }) {
               &scan_makefile($pn_arg_ref, $driver);
               if (!@{ $driver_config{$driver} }) {
                       push @{ $driver_config{$driver} }, "no_config";
               }
       }

       @configs = @{ $driver_config{$driver} };

       $$pn_arg_ref{config_cnt} = $#configs + 1;
       for my $config (@configs) {
               $$pn_arg_ref{config} = $config;
               $lines_printed += &print_node($pn_arg_ref);
       }

       return $lines_printed;
}


sub handle_compatible()
{
       my $full_node     = shift;
       my $node          = shift;
       my $compatible    = shift;
       my $node_enabled  = shift;

       my $compat;
       my $lines_printed = 0;
       my %pn_arg        = ();

       return if (!$node or !$compatible);

       # Do not process compatible property of root node,
       # it is used to match board, not to bind a driver.
       return if ($node eq "/");

       $pn_arg{full_node}    = $full_node;
       $pn_arg{node}         = $node;
       $pn_arg{node_enabled} = $node_enabled;

       my @compatibles = split('", "', $compatible);

       $compatibles[0] =~ s/^"//;
       $compatibles[$#compatibles] =~ s/"$//;

       $pn_arg{compatible_cnt} = $#compatibles + 1;

       COMPAT:
       for $compat (@compatibles) {

               $pn_arg{compat}     = $compat;
               $pn_arg{driver_cnt} = 0;
               $pn_arg{white_list} = 0;

               if (exists($compat_white_list{$compat})) {
                       $pn_arg{white_list} = 1;
                       $pn_arg{driver}     = "no_driver";
                       $pn_arg{config_cnt} = 1;
                       $pn_arg{config}     = "no_config";
                       $lines_printed += &print_node(\%pn_arg);
                       next COMPAT;
               }

               # ----- if compat previously seen, use cached info

               if (exists($compat_driver{$compat})) {
                       for my $driver (@{ $compat_driver{$compat} }) {
                               $pn_arg{driver}     = $driver;
                               $pn_arg{driver_cnt} = $driver_count{$compat};
                               $pn_arg{config_cnt} = $#{ $driver_config{$driver}} + 1;

                               for my $config (@{ $driver_config{$driver} }) {
                                       $pn_arg{config} = $config;
                                       $lines_printed += &print_node(\%pn_arg);
                               }

                               if (!@{ $driver_config{$driver} }) {
                                       # no config cached yet
                                       # $driver in %driver_hard_code_list
                                       # but not %driver_config_hard_code_list
                                       $lines_printed += &find_kconfig(\%pn_arg, $driver);
                               }
                       }
                       next COMPAT;
               }


               # ----- Find drivers (source files that contain compatible)

               # this will miss arch/sparc/include/asm/parport.h
               # It is better to move the compatible out of the .h
               # than to add *.h. to the files list, because *.h generates
               # a lot of false negatives.
               my $files = '"*.c"';
               my $drivers = `git grep -l '"$compat"' -- $files`;
               chomp($drivers);
               if ($drivers eq "") {
                       $pn_arg{driver} = "no_driver";
                       $pn_arg{config_cnt} = 1;
                       $pn_arg{config} = "no_config";
                       push @{ $compat_driver{$compat} }, "no_driver";
                       $lines_printed += &print_node(\%pn_arg);
                       next COMPAT;
               }

               my @drivers = split("\n", $drivers);
               $driver_count{$compat} = $#drivers + 1;
               $pn_arg{driver_cnt}    = $#drivers + 1;

               DRIVER:
               for my $driver (@drivers) {
                       push @{ $compat_driver{$compat} }, $driver;
                       $pn_arg{driver} = $driver;

                       # ----- if driver previously seen, use cached info

                       $pn_arg{config_cnt} = $#{ $driver_config{$driver} } + 1;
                       for my $config (@{ $driver_config{$driver} }) {
                               $pn_arg{config} = $config;
                               $lines_printed += &print_node(\%pn_arg);
                       }
                       if (@{ $driver_config{$driver} }) {
                               next DRIVER;
                       }

                       if ($black_list_driver) {
                               for $black (@black_list_driver) {
                                       next DRIVER if ($driver =~ /^$black$/);
                               }
                       }


                       # ----- Find Kconfig symbols that enable driver

                       $lines_printed += &find_kconfig(\%pn_arg, $driver);

               }
       }

       # White space (line) between nodes for readability.
       # Each node may report several compatibles.
       # For each compatible, multiple drivers may be reported.
       # For each driver, multiple CONFIG_ options may be reported.
       if ($lines_printed) {
               print "\n";
       }
}

sub read_dts()
{
       my $file         = shift;

       my $compatible   = "";
       my $line;
       my $node         = "";
       my $node_enabled = "";

       if (! -r $file) {
               print STDERR "file '$file' is not readable or does not exist\n";
               exit 3;
       }

       if (!open(DT_FILE, "-|", "$dtx_diff $file")) {
               print STDERR "\n";
               print STDERR "shell command failed:\n";
               print STDERR "   $dtx_diff $file\n";
               print STDERR "\n";
               exit 3;
       }

       FILE:
       while ($line = <DT_FILE>) {
               chomp($line);

               if ($line =~ /{/) {

                       &handle_compatible($full_node, $node, $compatible,
                                          $node_enabled);

                       while ($end_node_count-- > 0) {
                               pop @full_node;
                       };
                       $end_node_count = 0;
                       $full_node = @full_node[-1];

                       $node = $line;
                       $node =~ s/^\s*(.*)\s+\{.*/$1/;
                       $node =~ s/.*: //;
                       if ($node eq '/' ) {
                               $full_node = '/';
                       } elsif ($full_node ne '/') {
                               $full_node = $full_node . '/' . $node;
                       } else {
                               $full_node = '/' . $node;
                       }
                       push @full_node, $full_node;

                       $compatible = "";
                       $node_enabled = "";
                       next FILE;
               }

               if ($line =~ /}/) {
                       $end_node_count++;
               }

               if ($line =~ /(\s+|^)status =/) {
                       $node_enabled = $line;
                       $node_enabled =~ s/^\t*//;
                       $node_enabled =~ s/^status = "//;
                       $node_enabled =~ s/";$//;
                       next FILE;
               }

               if ($line =~ /(\s+|^)compatible =/) {
                       # Extract all compatible entries for this device
                       # White space matching here and in handle_compatible() is
                       # precise, because input format is the output of dtc,
                       # which is invoked by dtx_diff.
                       $compatible = $line;
                       $compatible =~ s/^\t*//;
                       $compatible =~ s/^compatible = //;
                       $compatible =~ s/;$//;
               }
       }

       &handle_compatible($full_node, $node, $compatible, $node_enabled);

       close(DT_FILE);
}


sub read_config_file()
{
       if (! -r $config_file) {
               print STDERR "file '$config_file' is not readable or does not exist\n";
               exit 2;
       }

       if (!open(CONFIG_FILE, "<", "$config_file")) {
               print STDERR "open $config_file failed\n";
               exit 2;
       }

       my @line;

       LINE:
       while ($line = <CONFIG_FILE>) {
               chomp($line);
               next LINE if ($line =~ /^\s*#/);
               next LINE if ($line =~ /^\s*$/);
               @line = split /=/, $line;
               $existing_config{@line[0]} = @line[1];
       }

       close(CONFIG_FILE);
}


sub cmd_line_err()
{
       my $msg = shift;

       print STDERR "\n";
       print STDERR "   ERROR processing command line options\n";
       print STDERR "         $msg\n" if ($msg ne "");
       print STDERR "\n";
       print STDERR "   For help, type '$script_name --help'\n";
       print STDERR "\n";
}


# -----------------------------------------------------------------------------
# program entry point

Getopt::Long::Configure("no_ignore_case", "bundling");

if (!GetOptions(
       "c=s"               => \$config_file,
       "config=s"          => \$config_file,
       "config-format"     => \$config_format,
       "exclude-flag=s"    => \@exclude_flag,
       "h"                 => \$help,
       "help"              => \$help,
       "black-list-driver" => \$black_list_driver,
       "white-list-config" => \$white_list_config,
       "white-list-driver" => \$white_list_driver,
       "include-flag=s"    => \@include_flag,
       "include-suspect"   => \$include_suspect,
       "short-name"        => \$short_name,
       "show-lists"        => \$show_lists,
       "version"           => \$version,
       )) {

       &cmd_line_err();

       exit 1;
}


my $exit_after_messages = 0;

if ($version) {
       print STDERR "\n$script_name  $VUFX\n\n";
       $exit_after_messages = 1;
}


if ($help) {
       &usage;
       $exit_after_messages = 1;
}


if ($show_lists) {

       print "\n";
       print "These compatibles are hard coded to have no driver.\n";
       print "\n";
       for my $compat (sort keys %compat_white_list) {
               print "   $compat\n";
       }


       print "\n\n";
       print "The driver for these compatibles is hard coded (white list).\n";
       print "\n";
       my $max_compat_len = 0;
       for my $compat (sort keys %driver_hard_code_list) {
               if (length $compat > $max_compat_len) {
                       $max_compat_len = length $compat;
               }
       }
       for my $compat (sort keys %driver_hard_code_list) {
               if (($driver ne "hardcoded_no_driver") && ($driver ne "no_driver")) {
                       my $first = 1;
                       for my $driver (@{ $driver_hard_code_list{$compat} }) {
                               if ($first) {
                                       print "   $compat";
                                       print " " x ($max_compat_len - length $compat);
                                       $first = 0;
                               } else {
                                       print "   ", " " x $max_compat_len;
                               }
                               print "  $driver\n";
                       }
               }
       }


       print "\n\n";
       print "The configuration option for these drivers is hard coded (white list).\n";
       print "\n";
       my $max_driver_len = 0;
       for my $driver (sort keys %driver_config_hard_code_list) {
               if (length $driver > $max_driver_len) {
                       $max_driver_len = length $driver;
               }
       }
       for my $driver (sort keys %driver_config_hard_code_list) {
               if (($driver ne "hardcoded_no_driver") && ($driver ne "no_driver")) {
                       my $first = 1;
                       for my $config (@{ $driver_config_hard_code_list{$driver} }) {
                               if ($first) {
                                       print "   $driver";
                                       print " " x ($max_driver_len - length $driver);
                                       $first = 0;
                               } else {
                                       print "   ", " " x $max_driver_len;
                               }
                               print "  $config\n";
                       }
               }
       }


       print "\n\n";
       print "These drivers are black listed.\n";
       print "\n";
       for my $driver (@black_list_driver) {
               print "   $driver\n";
       }

       print "\n";

       $exit_after_messages = 1;
}


if ($exit_after_messages) {
       exit 0;
}


$exclude_flag_pattern = "[";
for my $exclude_flag (@exclude_flag) {
       $exclude_flag_pattern = $exclude_flag_pattern . $exclude_flag;
}
$exclude_flag_pattern = $exclude_flag_pattern . "]";
# clean up if empty
$exclude_flag_pattern =~ s/^\[\]$//;


$include_flag_pattern = "[";
for my $include_flag (@include_flag) {
       $include_flag_pattern = $include_flag_pattern . $include_flag;
}
$include_flag_pattern = $include_flag_pattern . "]";
# clean up if empty
$include_flag_pattern =~ s/^\[\]$//;


if ($exclude_flag_pattern) {
       my $found = 0;
       for $pr_flag_value (@pr_flag_value) {
               if ($exclude_flag_pattern =~ m/$pr_flag_value/) {
                       $found = 1;
               }
       }
       if (!$found) {
               &cmd_line_err("invalid value for FLAG in --exclude-flag\n");
               exit 1
       }
}

if ($include_flag_pattern) {
       my $found = 0;
       for $pr_flag_value (@pr_flag_value) {
               if ($include_flag_pattern =~ m/$pr_flag_value/) {
                       $found = 1;
               }
       }
       if (!$found) {
               &cmd_line_err("invalid value for FLAG in --include-flag\n");
               exit 1
       }
}

if ($include_suspect) {
       $include_flag_pattern =~ s/\[//;
       $include_flag_pattern =~ s/\]//;
       $include_flag_pattern = "[" . $include_flag_pattern . "A-Z]";
}

if ($exclude_flag_pattern =~ m/$include_flag_pattern/) {
       &cmd_line_err("the same flag appears in both --exclude-flag and --include-flag or --include-suspect\n");
       exit 1
}


# ($#ARGV < 0) is valid for --help, --version
if ($#ARGV < 0) {
       &cmd_line_err("device-tree... is required");
       exit 1
}


if ($config_file) {
       &read_config_file();
}


# avoid pushing duplicates for this value
$driver = "hardcoded_no_driver";
for $config ( @{ $driver_config_hard_code_list{$driver} } ) {
       push @{ $driver_config{$driver} }, $config;
}

if ($white_list_driver) {
       for my $compat (keys %driver_hard_code_list) {
               for my $driver (@{ $driver_hard_code_list{$compat} }) {
                       push @{ $compat_driver{$compat} }, $driver;
                       if ($driver ne "hardcoded_no_driver") {
                               $driver_count{$compat} = scalar @{ $compat_driver{$compat} };
                       }
               }
       }
}

if ($white_list_config) {
       for my $driver (keys %driver_config_hard_code_list) {
               if ($driver ne "hardcoded_no_driver") {
                       for $config ( @{ $driver_config_hard_code_list{$driver} } ) {
                               push @{ $driver_config{$driver} }, $config;
                       }
               }
       }
}

if (-x "scripts/dtc/dtx_diff") {
       $dtx_diff = "scripts/dtc/dtx_diff";
} else {

       print STDERR "\n";
       print STDERR "$script_name must be run from the root directory of a Linux kernel tree\n";
       print STDERR "\n";
       exit 3;
}

for $file (@ARGV) {
       &read_dts($file);
}
OpenPOWER on IntegriCloud