aboutsummaryrefslogtreecommitdiff
path: root/drivers/acpi/ibm_acpi.c
blob: c6144ca6663861529a65d1f7f5c5d618be1f43f3 (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
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
/*
 *  ibm_acpi.c - IBM ThinkPad ACPI Extras
 *
 *
 *  Copyright (C) 2004-2005 Borislav Deianov <borislav@users.sf.net>
 *  Copyright (C) 2006 Henrique de Moraes Holschuh <hmh@hmh.eng.br>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#define IBM_VERSION "0.13"

/*
 *  Changelog:
 *
 *  2006-11-22	0.13	new maintainer
 *  			changelog now lives in git commit history, and will
 *  			not be updated further in-file.
 *  
 *  2005-08-17  0.12	fix compilation on 2.6.13-rc kernels
 *  2005-03-17	0.11	support for 600e, 770x
 *			    thanks to Jamie Lentin <lentinj@dial.pipex.com>
 *			support for 770e, G41
 *			G40 and G41 don't have a thinklight
 *			temperatures no longer experimental
 *			experimental brightness control
 *			experimental volume control
 *			experimental fan enable/disable
 *  2005-01-16	0.10	fix module loading on R30, R31 
 *  2005-01-16	0.9	support for 570, R30, R31
 *			ultrabay support on A22p, A3x
 *			limit arg for cmos, led, beep, drop experimental status
 *			more capable led control on A21e, A22p, T20-22, X20
 *			experimental temperatures and fan speed
 *			experimental embedded controller register dump
 *			mark more functions as __init, drop incorrect __exit
 *			use MODULE_VERSION
 *			    thanks to Henrik Brix Andersen <brix@gentoo.org>
 *			fix parameter passing on module loading
 *			    thanks to Rusty Russell <rusty@rustcorp.com.au>
 *			    thanks to Jim Radford <radford@blackbean.org>
 *  2004-11-08	0.8	fix init error case, don't return from a macro
 *			    thanks to Chris Wright <chrisw@osdl.org>
 *  2004-10-23	0.7	fix module loading on A21e, A22p, T20, T21, X20
 *			fix led control on A21e
 *  2004-10-19	0.6	use acpi_bus_register_driver() to claim HKEY device
 *  2004-10-18	0.5	thinklight support on A21e, G40, R32, T20, T21, X20
 *			proc file format changed
 *			video_switch command
 *			experimental cmos control
 *			experimental led control
 *			experimental acpi sounds
 *  2004-09-16	0.4	support for module parameters
 *			hotkey mask can be prefixed by 0x
 *			video output switching
 *			video expansion control
 *			ultrabay eject support
 *			removed lcd brightness/on/off control, didn't work
 *  2004-08-17	0.3	support for R40
 *			lcd off, brightness control
 *			thinklight on/off
 *  2004-08-14	0.2	support for T series, X20
 *			bluetooth enable/disable
 *			hotkey events disabled by default
 *			removed fan control, currently useless
 *  2004-08-09	0.1	initial release, support for X series
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/string.h>

#include <linux/proc_fs.h>
#include <linux/backlight.h>
#include <asm/uaccess.h>

#include <linux/dmi.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>

#include <acpi/acpi_drivers.h>
#include <acpi/acnamesp.h>

#define IBM_NAME "ibm"
#define IBM_DESC "IBM ThinkPad ACPI Extras"
#define IBM_FILE "ibm_acpi"
#define IBM_URL "http://ibm-acpi.sf.net/"

MODULE_AUTHOR("Borislav Deianov, Henrique de Moraes Holschuh");
MODULE_DESCRIPTION(IBM_DESC);
MODULE_VERSION(IBM_VERSION);
MODULE_LICENSE("GPL");

#define IBM_DIR IBM_NAME

#define IBM_LOG IBM_FILE ": "
#define IBM_ERR	   KERN_ERR    IBM_LOG
#define IBM_NOTICE KERN_NOTICE IBM_LOG
#define IBM_INFO   KERN_INFO   IBM_LOG
#define IBM_DEBUG  KERN_DEBUG  IBM_LOG

#define IBM_MAX_ACPI_ARGS 3

#define __unused __attribute__ ((unused))

static int experimental;
module_param(experimental, int, 0);

static acpi_handle root_handle = NULL;

#define IBM_HANDLE(object, parent, paths...)			\
	static acpi_handle  object##_handle;			\
	static acpi_handle *object##_parent = &parent##_handle;	\
	static char        *object##_path;			\
	static char        *object##_paths[] = { paths }

IBM_HANDLE(ec, root, "\\_SB.PCI0.ISA.EC0",	/* 240, 240x */
	   "\\_SB.PCI.ISA.EC",	/* 570 */
	   "\\_SB.PCI0.ISA0.EC0",	/* 600e/x, 770e, 770x */
	   "\\_SB.PCI0.ISA.EC",	/* A21e, A2xm/p, T20-22, X20-21 */
	   "\\_SB.PCI0.AD4S.EC0",	/* i1400, R30 */
	   "\\_SB.PCI0.ICH3.EC0",	/* R31 */
	   "\\_SB.PCI0.LPC.EC",	/* all others */
    );

IBM_HANDLE(vid, root, "\\_SB.PCI.AGP.VGA",	/* 570 */
	   "\\_SB.PCI0.AGP0.VID0",	/* 600e/x, 770x */
	   "\\_SB.PCI0.VID0",	/* 770e */
	   "\\_SB.PCI0.VID",	/* A21e, G4x, R50e, X30, X40 */
	   "\\_SB.PCI0.AGP.VID",	/* all others */
    );				/* R30, R31 */

IBM_HANDLE(vid2, root, "\\_SB.PCI0.AGPB.VID");	/* G41 */

IBM_HANDLE(cmos, root, "\\UCMS",	/* R50, R50e, R50p, R51, T4x, X31, X40 */
	   "\\CMOS",		/* A3x, G4x, R32, T23, T30, X22-24, X30 */
	   "\\CMS",		/* R40, R40e */
    );				/* all others */
#ifdef CONFIG_ACPI_IBM_DOCK
IBM_HANDLE(dock, root, "\\_SB.GDCK",	/* X30, X31, X40 */
	   "\\_SB.PCI0.DOCK",	/* 600e/x,770e,770x,A2xm/p,T20-22,X20-21 */
	   "\\_SB.PCI0.PCI1.DOCK",	/* all others */
	   "\\_SB.PCI.ISA.SLCE",	/* 570 */
    );				/* A21e,G4x,R30,R31,R32,R40,R40e,R50e */
#endif
IBM_HANDLE(bay, root, "\\_SB.PCI.IDE.SECN.MAST",	/* 570 */
	   "\\_SB.PCI0.IDE0.IDES.IDSM",	/* 600e/x, 770e, 770x */
	   "\\_SB.PCI0.SATA.SCND.MSTR",	/* T60, X60, Z60 */ 
	   "\\_SB.PCI0.IDE0.SCND.MSTR",	/* all others */
    );				/* A21e, R30, R31 */

IBM_HANDLE(bay_ej, bay, "_EJ3",	/* 600e/x, A2xm/p, A3x */
	   "_EJ0",		/* all others */
    );				/* 570,A21e,G4x,R30,R31,R32,R40e,R50e */

IBM_HANDLE(bay2, root, "\\_SB.PCI0.IDE0.PRIM.SLAV",	/* A3x, R32 */
	   "\\_SB.PCI0.IDE0.IDEP.IDPS",	/* 600e/x, 770e, 770x */
    );				/* all others */

IBM_HANDLE(bay2_ej, bay2, "_EJ3",	/* 600e/x, 770e, A3x */
	   "_EJ0",		/* 770x */
    );				/* all others */

/* don't list other alternatives as we install a notify handler on the 570 */
IBM_HANDLE(pci, root, "\\_SB.PCI");	/* 570 */

IBM_HANDLE(hkey, ec, "\\_SB.HKEY",	/* 600e/x, 770e, 770x */
	   "^HKEY",		/* R30, R31 */
	   "HKEY",		/* all others */
    );				/* 570 */

IBM_HANDLE(lght, root, "\\LGHT");	/* A21e, A2xm/p, T20-22, X20-21 */
IBM_HANDLE(ledb, ec, "LEDB");	/* G4x */

IBM_HANDLE(led, ec, "SLED",	/* 570 */
	   "SYSL",		/* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
	   "LED",		/* all others */
    );				/* R30, R31 */

IBM_HANDLE(beep, ec, "BEEP");	/* all except R30, R31 */
IBM_HANDLE(ecrd, ec, "ECRD");	/* 570 */
IBM_HANDLE(ecwr, ec, "ECWR");	/* 570 */
IBM_HANDLE(fans, ec, "FANS");	/* X31, X40, X41 */

IBM_HANDLE(gfan, ec, "GFAN",	/* 570 */
	   "\\FSPD",		/* 600e/x, 770e, 770x */
    );				/* all others */

IBM_HANDLE(sfan, ec, "SFAN",	/* 570 */
	   "JFNS",		/* 770x-JL */
    );				/* all others */

#define IBM_HKEY_HID	"IBM0068"
#define IBM_PCI_HID	"PNP0A03"

enum thermal_access_mode {
	IBMACPI_THERMAL_NONE = 0,	/* No thermal support */
	IBMACPI_THERMAL_ACPI_TMP07,	/* Use ACPI TMP0-7 */
	IBMACPI_THERMAL_ACPI_UPDT,	/* Use ACPI TMP0-7 with UPDT */
	IBMACPI_THERMAL_TPEC_8,		/* Use ACPI EC regs, 8 sensors */
	IBMACPI_THERMAL_TPEC_16,	/* Use ACPI EC regs, 16 sensors */
};

#define IBMACPI_MAX_THERMAL_SENSORS 16	/* Max thermal sensors supported */
struct ibm_thermal_sensors_struct {
	s32 temp[IBMACPI_MAX_THERMAL_SENSORS];
};

/*
 * FAN ACCESS MODES
 *
 * IBMACPI_FAN_RD_ACPI_GFAN:
 * 	ACPI GFAN method: returns fan level
 *
 * 	see IBMACPI_FAN_WR_ACPI_SFAN
 * 	EC 0x2f not available if GFAN exists
 *
 * IBMACPI_FAN_WR_ACPI_SFAN:
 * 	ACPI SFAN method: sets fan level, 0 (stop) to 7 (max)
 *
 * 	EC 0x2f might be available *for reading*, but never for writing.
 *
 * IBMACPI_FAN_WR_TPEC:
 * 	ThinkPad EC register 0x2f (HFSP): fan control loop mode Supported
 * 	on almost all ThinkPads
 *
 * 	Fan speed changes of any sort (including those caused by the
 * 	disengaged mode) are usually done slowly by the firmware as the
 * 	maximum ammount of fan duty cycle change per second seems to be
 * 	limited.
 *
 * 	Reading is not available if GFAN exists.
 * 	Writing is not available if SFAN exists.
 *
 * 	Bits
 *	 7	automatic mode engaged;
 *  		(default operation mode of the ThinkPad)
 * 		fan level is ignored in this mode.
 *	 6	disengage mode (takes precedence over bit 7);
 *		not available on all thinkpads.  May disable
 *		the tachometer, and speeds up fan to 100% duty-cycle,
 *		which speeds it up far above the standard RPM
 *		levels.  It is not impossible that it could cause
 *		hardware damage.
 *	5-3	unused in some models.  Extra bits for fan level
 *		in others, but still useless as all values above
 *		7 map to the same speed as level 7 in these models.
 *	2-0	fan level (0..7 usually)
 *			0x00 = stop
 * 			0x07 = max (set when temperatures critical)
 * 		Some ThinkPads may have other levels, see
 * 		IBMACPI_FAN_WR_ACPI_FANS (X31/X40/X41)
 *
 *	FIRMWARE BUG: on some models, EC 0x2f might not be initialized at
 *	boot. Apparently the EC does not intialize it, so unless ACPI DSDT
 *	does so, its initial value is meaningless (0x07).
 *
 *	For firmware bugs, refer to:
 *	http://thinkwiki.org/wiki/Embedded_Controller_Firmware#Firmware_Issues
 *
 * 	----
 *
 *	ThinkPad EC register 0x84 (LSB), 0x85 (MSB):
 *	Main fan tachometer reading (in RPM)
 *
 *	This register is present on all ThinkPads with a new-style EC, and
 *	it is known not to be present on the A21m/e, and T22, as there is
 *	something else in offset 0x84 according to the ACPI DSDT.  Other
 *	ThinkPads from this same time period (and earlier) probably lack the
 *	tachometer as well.
 *
 *	Unfortunately a lot of ThinkPads with new-style ECs but whose firwmare
 *	was never fixed by IBM to report the EC firmware version string
 *	probably support the tachometer (like the early X models), so
 *	detecting it is quite hard.  We need more data to know for sure.
 *
 *	FIRMWARE BUG: always read 0x84 first, otherwise incorrect readings
 *	might result.
 *
 *	FIRMWARE BUG: when EC 0x2f bit 6 is set (disengaged mode), this
 *	register is not invalidated in ThinkPads that disable tachometer
 *	readings.  Thus, the tachometer readings go stale.
 *
 *	For firmware bugs, refer to:
 *	http://thinkwiki.org/wiki/Embedded_Controller_Firmware#Firmware_Issues
 *
 * IBMACPI_FAN_WR_ACPI_FANS:
 *	ThinkPad X31, X40, X41.  Not available in the X60.
 *
 *	FANS ACPI handle: takes three arguments: low speed, medium speed,
 *	high speed.  ACPI DSDT seems to map these three speeds to levels
 *	as follows: STOP LOW LOW MED MED HIGH HIGH HIGH HIGH
 *	(this map is stored on FAN0..FAN8 as "0,1,1,2,2,3,3,3,3")
 *
 * 	The speeds are stored on handles
 * 	(FANA:FAN9), (FANC:FANB), (FANE:FAND).
 *
 * 	There are three default speed sets, acessible as handles:
 * 	FS1L,FS1M,FS1H; FS2L,FS2M,FS2H; FS3L,FS3M,FS3H
 *
 * 	ACPI DSDT switches which set is in use depending on various
 * 	factors.
 *
 * 	IBMACPI_FAN_WR_TPEC is also available and should be used to
 * 	command the fan.  The X31/X40/X41 seems to have 8 fan levels,
 * 	but the ACPI tables just mention level 7.
 */

enum fan_status_access_mode {
	IBMACPI_FAN_NONE = 0,		/* No fan status or control */
	IBMACPI_FAN_RD_ACPI_GFAN,	/* Use ACPI GFAN */
	IBMACPI_FAN_RD_TPEC,		/* Use ACPI EC regs 0x2f, 0x84-0x85 */
};

enum fan_control_access_mode {
	IBMACPI_FAN_WR_NONE = 0,	/* No fan control */
	IBMACPI_FAN_WR_ACPI_SFAN,	/* Use ACPI SFAN */
	IBMACPI_FAN_WR_TPEC,		/* Use ACPI EC reg 0x2f */
	IBMACPI_FAN_WR_ACPI_FANS,	/* Use ACPI FANS and EC reg 0x2f */
};

enum fan_control_commands {
	IBMACPI_FAN_CMD_SPEED 	= 0x0001,	/* speed command */
	IBMACPI_FAN_CMD_LEVEL 	= 0x0002,	/* level command  */
	IBMACPI_FAN_CMD_ENABLE	= 0x0004,	/* enable/disable cmd,
						 * and also watchdog cmd */
};

enum {					/* Fan control constants */
	fan_status_offset = 0x2f,	/* EC register 0x2f */
	fan_rpm_offset = 0x84,		/* EC register 0x84: LSB, 0x85 MSB (RPM)
					 * 0x84 must be read before 0x85 */

	IBMACPI_FAN_EC_DISENGAGED 	= 0x40,	/* EC mode: tachometer
						 * disengaged */
	IBMACPI_FAN_EC_AUTO		= 0x80, /* EC mode: auto fan
						 * control */
};

static char *ibm_thinkpad_ec_found = NULL;

struct ibm_struct {
	char *name;
	char param[32];

	char *hid;
	struct acpi_driver *driver;

	int (*init) (void);
	int (*read) (char *);
	int (*write) (char *);
	void (*exit) (void);

	void (*notify) (struct ibm_struct *, u32);
	acpi_handle *handle;
	int type;
	struct acpi_device *device;

	int driver_registered;
	int proc_created;
	int init_called;
	int notify_installed;

	int experimental;
};

static struct proc_dir_entry *proc_dir = NULL;

static struct backlight_device *ibm_backlight_device = NULL;

#define onoff(status,bit) ((status) & (1 << (bit)) ? "on" : "off")
#define enabled(status,bit) ((status) & (1 << (bit)) ? "enabled" : "disabled")
#define strlencmp(a,b) (strncmp((a), (b), strlen(b)))

static int acpi_evalf(acpi_handle handle,
		      void *res, char *method, char *fmt, ...)
{
	char *fmt0 = fmt;
	struct acpi_object_list params;
	union acpi_object in_objs[IBM_MAX_ACPI_ARGS];
	struct acpi_buffer result, *resultp;
	union acpi_object out_obj;
	acpi_status status;
	va_list ap;
	char res_type;
	int success;
	int quiet;

	if (!*fmt) {
		printk(IBM_ERR "acpi_evalf() called with empty format\n");
		return 0;
	}

	if (*fmt == 'q') {
		quiet = 1;
		fmt++;
	} else
		quiet = 0;

	res_type = *(fmt++);

	params.count = 0;
	params.pointer = &in_objs[0];

	va_start(ap, fmt);
	while (*fmt) {
		char c = *(fmt++);
		switch (c) {
		case 'd':	/* int */
			in_objs[params.count].integer.value = va_arg(ap, int);
			in_objs[params.count++].type = ACPI_TYPE_INTEGER;
			break;
			/* add more types as needed */
		default:
			printk(IBM_ERR "acpi_evalf() called "
			       "with invalid format character '%c'\n", c);
			return 0;
		}
	}
	va_end(ap);

	if (res_type != 'v') {
		result.length = sizeof(out_obj);
		result.pointer = &out_obj;
		resultp = &result;
	} else
		resultp = NULL;

	status = acpi_evaluate_object(handle, method, &params, resultp);

	switch (res_type) {
	case 'd':		/* int */
		if (res)
			*(int *)res = out_obj.integer.value;
		success = status == AE_OK && out_obj.type == ACPI_TYPE_INTEGER;
		break;
	case 'v':		/* void */
		success = status == AE_OK;
		break;
		/* add more types as needed */
	default:
		printk(IBM_ERR "acpi_evalf() called "
		       "with invalid format character '%c'\n", res_type);
		return 0;
	}

	if (!success && !quiet)
		printk(IBM_ERR "acpi_evalf(%s, %s, ...) failed: %d\n",
		       method, fmt0, status);

	return success;
}

static void __unused acpi_print_int(acpi_handle handle, char *method)
{
	int i;

	if (acpi_evalf(handle, &i, method, "d"))
		printk(IBM_INFO "%s = 0x%x\n", method, i);
	else
		printk(IBM_ERR "error calling %s\n", method);
}

static char *next_cmd(char **cmds)
{
	char *start = *cmds;
	char *end;

	while ((end = strchr(start, ',')) && end == start)
		start = end + 1;

	if (!end)
		return NULL;

	*end = 0;
	*cmds = end + 1;
	return start;
}

static int ibm_acpi_driver_init(void)
{
	printk(IBM_INFO "%s v%s\n", IBM_DESC, IBM_VERSION);
	printk(IBM_INFO "%s\n", IBM_URL);

	return 0;
}

static int driver_read(char *p)
{
	int len = 0;

	len += sprintf(p + len, "driver:\t\t%s\n", IBM_DESC);
	len += sprintf(p + len, "version:\t%s\n", IBM_VERSION);

	return len;
}

static int hotkey_supported;
static int hotkey_mask_supported;
static int hotkey_orig_status;
static int hotkey_orig_mask;

static int hotkey_get(int *status, int *mask)
{
	if (!acpi_evalf(hkey_handle, status, "DHKC", "d"))
		return 0;

	if (hotkey_mask_supported)
		if (!acpi_evalf(hkey_handle, mask, "DHKN", "d"))
			return 0;

	return 1;
}

static int hotkey_set(int status, int mask)
{
	int i;

	if (!acpi_evalf(hkey_handle, NULL, "MHKC", "vd", status))
		return 0;

	if (hotkey_mask_supported)
		for (i = 0; i < 32; i++) {
			int bit = ((1 << i) & mask) != 0;
			if (!acpi_evalf(hkey_handle,
					NULL, "MHKM", "vdd", i + 1, bit))
				return 0;
		}

	return 1;
}

static int hotkey_init(void)
{
	/* hotkey not supported on 570 */
	hotkey_supported = hkey_handle != NULL;

	if (hotkey_supported) {
		/* mask not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
		   A30, R30, R31, T20-22, X20-21, X22-24 */
		hotkey_mask_supported =
		    acpi_evalf(hkey_handle, NULL, "DHKN", "qv");

		if (!hotkey_get(&hotkey_orig_status, &hotkey_orig_mask))
			return -ENODEV;
	}

	return 0;
}

static int hotkey_read(char *p)
{
	int status, mask;
	int len = 0;

	if (!hotkey_supported) {
		len += sprintf(p + len, "status:\t\tnot supported\n");
		return len;
	}

	if (!hotkey_get(&status, &mask))
		return -EIO;

	len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 0));
	if (hotkey_mask_supported) {
		len += sprintf(p + len, "mask:\t\t0x%04x\n", mask);
		len += sprintf(p + len,
			       "commands:\tenable, disable, reset, <mask>\n");
	} else {
		len += sprintf(p + len, "mask:\t\tnot supported\n");
		len += sprintf(p + len, "commands:\tenable, disable, reset\n");
	}

	return len;
}

static int hotkey_write(char *buf)
{
	int status, mask;
	char *cmd;
	int do_cmd = 0;

	if (!hotkey_supported)
		return -ENODEV;

	if (!hotkey_get(&status, &mask))
		return -EIO;

	while ((cmd = next_cmd(&buf))) {
		if (strlencmp(cmd, "enable") == 0) {
			status = 1;
		} else if (strlencmp(cmd, "disable") == 0) {
			status = 0;
		} else if (strlencmp(cmd, "reset") == 0) {
			status = hotkey_orig_status;
			mask = hotkey_orig_mask;
		} else if (sscanf(cmd, "0x%x", &mask) == 1) {
			/* mask set */
		} else if (sscanf(cmd, "%x", &mask) == 1) {
			/* mask set */
		} else
			return -EINVAL;
		do_cmd = 1;
	}

	if (do_cmd && !hotkey_set(status, mask))
		return -EIO;

	return 0;
}

static void hotkey_exit(void)
{
	if (hotkey_supported)
		hotkey_set(hotkey_orig_status, hotkey_orig_mask);
}

static void hotkey_notify(struct ibm_struct *ibm, u32 event)
{
	int hkey;

	if (acpi_evalf(hkey_handle, &hkey, "MHKP", "d"))
		acpi_bus_generate_event(ibm->device, event, hkey);
	else {
		printk(IBM_ERR "unknown hotkey event %d\n", event);
		acpi_bus_generate_event(ibm->device, event, 0);
	}
}

static int bluetooth_supported;

static int bluetooth_init(void)
{
	/* bluetooth not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
	   G4x, R30, R31, R40e, R50e, T20-22, X20-21 */
	bluetooth_supported = hkey_handle &&
	    acpi_evalf(hkey_handle, NULL, "GBDC", "qv");

	return 0;
}

static int bluetooth_status(void)
{
	int status;

	if (!bluetooth_supported ||
	    !acpi_evalf(hkey_handle, &status, "GBDC", "d"))
		status = 0;

	return status;
}

static int bluetooth_read(char *p)
{
	int len = 0;
	int status = bluetooth_status();

	if (!bluetooth_supported)
		len += sprintf(p + len, "status:\t\tnot supported\n");
	else if (!(status & 1))
		len += sprintf(p + len, "status:\t\tnot installed\n");
	else {
		len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 1));
		len += sprintf(p + len, "commands:\tenable, disable\n");
	}

	return len;
}

static int bluetooth_write(char *buf)
{
	int status = bluetooth_status();
	char *cmd;
	int do_cmd = 0;

	if (!bluetooth_supported)
		return -ENODEV;

	while ((cmd = next_cmd(&buf))) {
		if (strlencmp(cmd, "enable") == 0) {
			status |= 2;
		} else if (strlencmp(cmd, "disable") == 0) {
			status &= ~2;
		} else
			return -EINVAL;
		do_cmd = 1;
	}

	if (do_cmd && !acpi_evalf(hkey_handle, NULL, "SBDC", "vd", status))
		return -EIO;

	return 0;
}

static int wan_supported;

static int wan_init(void)
{
	wan_supported = hkey_handle &&
	    acpi_evalf(hkey_handle, NULL, "GWAN", "qv");

	return 0;
}

static int wan_status(void)
{
	int status;

	if (!wan_supported || !acpi_evalf(hkey_handle, &status, "GWAN", "d"))
		status = 0;

	return status;
}

static int wan_read(char *p)
{
	int len = 0;
	int status = wan_status();

	if (!wan_supported)
		len += sprintf(p + len, "status:\t\tnot supported\n");
	else if (!(status & 1))
		len += sprintf(p + len, "status:\t\tnot installed\n");
	else {
		len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 1));
		len += sprintf(p + len, "commands:\tenable, disable\n");
	}

	return len;
}

static int wan_write(char *buf)
{
	int status = wan_status();
	char *cmd;
	int do_cmd = 0;

	if (!wan_supported)
		return -ENODEV;

	while ((cmd = next_cmd(&buf))) {
		if (strlencmp(cmd, "enable") == 0) {
			status |= 2;
		} else if (strlencmp(cmd, "disable") == 0) {
			status &= ~2;
		} else
			return -EINVAL;
		do_cmd = 1;
	}

	if (do_cmd && !acpi_evalf(hkey_handle, NULL, "SWAN", "vd", status))
		return -EIO;

	return 0;
}

enum video_access_mode {
	IBMACPI_VIDEO_NONE = 0,
	IBMACPI_VIDEO_570,	/* 570 */
	IBMACPI_VIDEO_770,	/* 600e/x, 770e, 770x */
	IBMACPI_VIDEO_NEW,	/* all others */
};

static enum video_access_mode video_supported;
static int video_orig_autosw;

static int video_init(void)
{
	int ivga;

	if (vid2_handle && acpi_evalf(NULL, &ivga, "\\IVGA", "d") && ivga)
		/* G41, assume IVGA doesn't change */
		vid_handle = vid2_handle;

	if (!vid_handle)
		/* video switching not supported on R30, R31 */
		video_supported = IBMACPI_VIDEO_NONE;
	else if (acpi_evalf(vid_handle, &video_orig_autosw, "SWIT", "qd"))
		/* 570 */
		video_supported = IBMACPI_VIDEO_570;
	else if (acpi_evalf(vid_handle, &video_orig_autosw, "^VADL", "qd"))
		/* 600e/x, 770e, 770x */
		video_supported = IBMACPI_VIDEO_770;
	else
		/* all others */
		video_supported = IBMACPI_VIDEO_NEW;

	return 0;
}

static int video_status(void)
{
	int status = 0;
	int i;

	if (video_supported == IBMACPI_VIDEO_570) {
		if (acpi_evalf(NULL, &i, "\\_SB.PHS", "dd", 0x87))
			status = i & 3;
	} else if (video_supported == IBMACPI_VIDEO_770) {
		if (acpi_evalf(NULL, &i, "\\VCDL", "d"))
			status |= 0x01 * i;
		if (acpi_evalf(NULL, &i, "\\VCDC", "d"))
			status |= 0x02 * i;
	} else if (video_supported == IBMACPI_VIDEO_NEW) {
		acpi_evalf(NULL, NULL, "\\VUPS", "vd", 1);
		if (acpi_evalf(NULL, &i, "\\VCDC", "d"))
			status |= 0x02 * i;

		acpi_evalf(NULL, NULL, "\\VUPS", "vd", 0);
		if (acpi_evalf(NULL, &i, "\\VCDL", "d"))
			status |= 0x01 * i;
		if (acpi_evalf(NULL, &i, "\\VCDD", "d"))
			status |= 0x08 * i;
	}

	return status;
}

static int video_autosw(void)
{
	int autosw = 0;

	if (video_supported == IBMACPI_VIDEO_570)
		acpi_evalf(vid_handle, &autosw, "SWIT", "d");
	else if (video_supported == IBMACPI_VIDEO_770 ||
		 video_supported == IBMACPI_VIDEO_NEW)
		acpi_evalf(vid_handle, &autosw, "^VDEE", "d");

	return autosw & 1;
}

static int video_read(char *p)
{
	int status = video_status();
	int autosw = video_autosw();
	int len = 0;

	if (!video_supported) {
		len += sprintf(p + len, "status:\t\tnot supported\n");
		return len;
	}

	len += sprintf(p + len, "status:\t\tsupported\n");
	len += sprintf(p + len, "lcd:\t\t%s\n", enabled(status, 0));
	len += sprintf(p + len, "crt:\t\t%s\n", enabled(status, 1));
	if (video_supported == IBMACPI_VIDEO_NEW)
		len += sprintf(p + len, "dvi:\t\t%s\n", enabled(status, 3));
	len += sprintf(p + len, "auto:\t\t%s\n", enabled(autosw, 0));
	len += sprintf(p + len, "commands:\tlcd_enable, lcd_disable\n");
	len += sprintf(p + len, "commands:\tcrt_enable, crt_disable\n");
	if (video_supported == IBMACPI_VIDEO_NEW)
		len += sprintf(p + len, "commands:\tdvi_enable, dvi_disable\n");
	len += sprintf(p + len, "commands:\tauto_enable, auto_disable\n");
	len += sprintf(p + len, "commands:\tvideo_switch, expand_toggle\n");

	return len;
}

static int video_switch(void)
{
	int autosw = video_autosw();
	int ret;

	if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 1))
		return -EIO;
	ret = video_supported == IBMACPI_VIDEO_570 ?
	    acpi_evalf(ec_handle, NULL, "_Q16", "v") :
	    acpi_evalf(vid_handle, NULL, "VSWT", "v");
	acpi_evalf(vid_handle, NULL, "_DOS", "vd", autosw);

	return ret;
}

static int video_expand(void)
{
	if (video_supported == IBMACPI_VIDEO_570)
		return acpi_evalf(ec_handle, NULL, "_Q17", "v");
	else if (video_supported == IBMACPI_VIDEO_770)
		return acpi_evalf(vid_handle, NULL, "VEXP", "v");
	else
		return acpi_evalf(NULL, NULL, "\\VEXP", "v");
}

static int video_switch2(int status)
{
	int ret;

	if (video_supported == IBMACPI_VIDEO_570) {
		ret = acpi_evalf(NULL, NULL,
				 "\\_SB.PHS2", "vdd", 0x8b, status | 0x80);
	} else if (video_supported == IBMACPI_VIDEO_770) {
		int autosw = video_autosw();
		if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 1))
			return -EIO;

		ret = acpi_evalf(vid_handle, NULL,
				 "ASWT", "vdd", status * 0x100, 0);

		acpi_evalf(vid_handle, NULL, "_DOS", "vd", autosw);
	} else {
		ret = acpi_evalf(NULL, NULL, "\\VUPS", "vd", 0x80) &&
		    acpi_evalf(NULL, NULL, "\\VSDS", "vdd", status, 1);
	}

	return ret;
}

static int video_write(char *buf)
{
	char *cmd;
	int enable, disable, status;

	if (!video_supported)
		return -ENODEV;

	enable = disable = 0;

	while ((cmd = next_cmd(&buf))) {
		if (strlencmp(cmd, "lcd_enable") == 0) {
			enable |= 0x01;
		} else if (strlencmp(cmd, "lcd_disable") == 0) {
			disable |= 0x01;
		} else if (strlencmp(cmd, "crt_enable") == 0) {
			enable |= 0x02;
		} else if (strlencmp(cmd, "crt_disable") == 0) {
			disable |= 0x02;
		} else if (video_supported == IBMACPI_VIDEO_NEW &&
			   strlencmp(cmd, "dvi_enable") == 0) {
			enable |= 0x08;
		} else if (video_supported == IBMACPI_VIDEO_NEW &&
			   strlencmp(cmd, "dvi_disable") == 0) {
			disable |= 0x08;
		} else if (strlencmp(cmd, "auto_enable") == 0) {
			if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 1))
				return -EIO;
		} else if (strlencmp(cmd, "auto_disable") == 0) {
			if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 0))
				return -EIO;
		} else if (strlencmp(cmd, "video_switch") == 0) {
			if (!video_switch())
				return -EIO;
		} else if (strlencmp(cmd, "expand_toggle") == 0) {
			if (!video_expand())
				return -EIO;
		} else
			return -EINVAL;
	}

	if (enable || disable) {
		status = (video_status() & 0x0f & ~disable) | enable;
		if (!video_switch2(status))
			return -EIO;
	}

	return 0;
}

static void video_exit(void)
{
	acpi_evalf(vid_handle, NULL, "_DOS", "vd", video_orig_autosw);
}

static int light_supported;
static int light_status_supported;

static int light_init(void)
{
	/* light not supported on 570, 600e/x, 770e, 770x, G4x, R30, R31 */
	light_supported = (cmos_handle || lght_handle) && !ledb_handle;

	if (light_supported)
		/* light status not supported on
		   570, 600e/x, 770e, 770x, G4x, R30, R31, R32, X20 */
		light_status_supported = acpi_evalf(ec_handle, NULL,
						    "KBLT", "qv");

	return 0;
}

static int light_read(char *p)
{
	int len = 0;
	int status = 0;

	if (!light_supported) {
		len += sprintf(p + len, "status:\t\tnot supported\n");
	} else if (!light_status_supported) {
		len += sprintf(p + len, "status:\t\tunknown\n");
		len += sprintf(p + len, "commands:\ton, off\n");
	} else {
		if (!acpi_evalf(ec_handle, &status, "KBLT", "d"))
			return -EIO;
		len += sprintf(p + len, "status:\t\t%s\n", onoff(status, 0));
		len += sprintf(p + len, "commands:\ton, off\n");
	}

	return len;
}

static int light_write(char *buf)
{
	int cmos_cmd, lght_cmd;
	char *cmd;
	int success;

	if (!light_supported)
		return -ENODEV;

	while ((cmd = next_cmd(&buf))) {
		if (strlencmp(cmd, "on") == 0) {
			cmos_cmd = 0x0c;
			lght_cmd = 1;
		} else if (strlencmp(cmd, "off") == 0) {
			cmos_cmd = 0x0d;
			lght_cmd = 0;
		} else
			return -EINVAL;

		success = cmos_handle ?
		    acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd) :
		    acpi_evalf(lght_handle, NULL, NULL, "vd", lght_cmd);
		if (!success)
			return -EIO;
	}

	return 0;
}

static int _sta(acpi_handle handle)
{
	int status;

	if (!handle || !acpi_evalf(handle, &status, "_STA", "d"))
		status = 0;

	return status;
}

#ifdef CONFIG_ACPI_IBM_DOCK
#define dock_docked() (_sta(dock_handle) & 1)

static int dock_read(char *p)
{
	int len = 0;
	int docked = dock_docked();

	if (!dock_handle)
		len += sprintf(p + len, "status:\t\tnot supported\n");
	else if (!docked)
		len += sprintf(p + len, "status:\t\tundocked\n");
	else {
		len += sprintf(p + len, "status:\t\tdocked\n");
		len += sprintf(p + len, "commands:\tdock, undock\n");
	}

	return len;
}

static int dock_write(char *buf)
{
	char *cmd;

	if (!dock_docked())
		return -ENODEV;

	while ((cmd = next_cmd(&buf))) {
		if (strlencmp(cmd, "undock") == 0) {
			if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 0) ||
			    !acpi_evalf(dock_handle, NULL, "_EJ0", "vd", 1))
				return -EIO;
		} else if (strlencmp(cmd, "dock") == 0) {
			if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 1))
				return -EIO;
		} else
			return -EINVAL;
	}

	return 0;
}

static void dock_notify(struct ibm_struct *ibm, u32 event)
{
	int docked = dock_docked();
	int pci = ibm->hid && strstr(ibm->hid, IBM_PCI_HID);

	if (event == 1 && !pci)	/* 570 */
		acpi_bus_generate_event(ibm->device, event, 1);	/* button */
	else if (event == 1 && pci)	/* 570 */
		acpi_bus_generate_event(ibm->device, event, 3);	/* dock */
	else if (event == 3 && docked)
		acpi_bus_generate_event(ibm->device, event, 1);	/* button */
	else if (event == 3 && !docked)
		acpi_bus_generate_event(ibm->device, event, 2);	/* undock */
	else if (event == 0 && docked)
		acpi_bus_generate_event(ibm->device, event, 3);	/* dock */
	else {
		printk(IBM_ERR "unknown dock event %d, status %d\n",
		       event, _sta(dock_handle));
		acpi_bus_generate_event(ibm->device, event, 0);	/* unknown */
	}
}
#endif

static int bay_status_supported;
static int bay_status2_supported;
static int bay_eject_supported;
static int bay_eject2_supported;

static int bay_init(void)
{
	bay_status_supported = bay_handle &&
	    acpi_evalf(bay_handle, NULL, "_STA", "qv");
	bay_status2_supported = bay2_handle &&
	    acpi_evalf(bay2_handle, NULL, "_STA", "qv");

	bay_eject_supported = bay_handle && bay_ej_handle &&
	    (strlencmp(bay_ej_path, "_EJ0") == 0 || experimental);
	bay_eject2_supported = bay2_handle && bay2_ej_handle &&
	    (strlencmp(bay2_ej_path, "_EJ0") == 0 || experimental);

	return 0;
}

#define bay_occupied(b) (_sta(b##_handle) & 1)

static int bay_read(char *p)
{
	int len = 0;
	int occupied = bay_occupied(bay);
	int occupied2 = bay_occupied(bay2);
	int eject, eject2;

	len += sprintf(p + len, "status:\t\t%s\n", bay_status_supported ?
		       (occupied ? "occupied" : "unoccupied") :
		       "not supported");
	if (bay_status2_supported)
		len += sprintf(p + len, "status2:\t%s\n", occupied2 ?
			       "occupied" : "unoccupied");

	eject = bay_eject_supported && occupied;
	eject2 = bay_eject2_supported && occupied2;

	if (eject && eject2)
		len += sprintf(p + len, "commands:\teject, eject2\n");
	else if (eject)
		len += sprintf(p + len, "commands:\teject\n");
	else if (eject2)
		len += sprintf(p + len, "commands:\teject2\n");

	return len;
}

static int bay_write(char *buf)
{
	char *cmd;

	if (!bay_eject_supported && !bay_eject2_supported)
		return -ENODEV;

	while ((cmd = next_cmd(&buf))) {
		if (bay_eject_supported && strlencmp(cmd, "eject") == 0) {
			if (!acpi_evalf(bay_ej_handle, NULL, NULL, "vd", 1))
				return -EIO;
		} else if (bay_eject2_supported &&
			   strlencmp(cmd, "eject2") == 0) {
			if (!acpi_evalf(bay2_ej_handle, NULL, NULL, "vd", 1))
				return -EIO;
		} else
			return -EINVAL;
	}

	return 0;
}

static void bay_notify(struct ibm_struct *ibm, u32 event)
{
	acpi_bus_generate_event(ibm->device, event, 0);
}

static int cmos_read(char *p)
{
	int len = 0;

	/* cmos not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
	   R30, R31, T20-22, X20-21 */
	if (!cmos_handle)
		len += sprintf(p + len, "status:\t\tnot supported\n");
	else {
		len += sprintf(p + len, "status:\t\tsupported\n");
		len += sprintf(p + len, "commands:\t<cmd> (<cmd> is 0-21)\n");
	}

	return len;
}

static int cmos_eval(int cmos_cmd)
{
	if (cmos_handle)
		return acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd);
	else
		return 1;
}

static int cmos_write(char *buf)
{
	char *cmd;
	int cmos_cmd;

	if (!cmos_handle)
		return -EINVAL;

	while ((cmd = next_cmd(&buf))) {
		if (sscanf(cmd, "%u", &cmos_cmd) == 1 &&
		    cmos_cmd >= 0 && cmos_cmd <= 21) {
			/* cmos_cmd set */
		} else
			return -EINVAL;

		if (!cmos_eval(cmos_cmd))
			return -EIO;
	}

	return 0;
}

enum led_access_mode {
	IBMACPI_LED_NONE = 0,
	IBMACPI_LED_570,	/* 570 */
	IBMACPI_LED_OLD,	/* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
	IBMACPI_LED_NEW,	/* all others */
};
static enum led_access_mode led_supported;

static int led_init(void)
{
	if (!led_handle)
		/* led not supported on R30, R31 */
		led_supported = IBMACPI_LED_NONE;
	else if (strlencmp(led_path, "SLED") == 0)
		/* 570 */
		led_supported = IBMACPI_LED_570;
	else if (strlencmp(led_path, "SYSL") == 0)
		/* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
		led_supported = IBMACPI_LED_OLD;
	else
		/* all others */
		led_supported = IBMACPI_LED_NEW;

	return 0;
}

#define led_status(s) ((s) == 0 ? "off" : ((s) == 1 ? "on" : "blinking"))

static int led_read(char *p)
{
	int len = 0;

	if (!led_supported) {
		len += sprintf(p + len, "status:\t\tnot supported\n");
		return len;
	}
	len += sprintf(p + len, "status:\t\tsupported\n");

	if (led_supported == IBMACPI_LED_570) {
		/* 570 */
		int i, status;
		for (i = 0; i < 8; i++) {
			if (!acpi_evalf(ec_handle,
					&status, "GLED", "dd", 1 << i))
				return -EIO;
			len += sprintf(p + len, "%d:\t\t%s\n",
				       i, led_status(status));
		}
	}

	len += sprintf(p + len, "commands:\t"
		       "<led> on, <led> off, <led> blink (<led> is 0-7)\n");

	return len;
}

/* off, on, blink */
static const int led_sled_arg1[] = { 0, 1, 3 };
static const int led_exp_hlbl[] = { 0, 0, 1 };	/* led# * */
static const int led_exp_hlcl[] = { 0, 1, 1 };	/* led# * */
static const int led_led_arg1[] = { 0, 0x80, 0xc0 };

#define EC_HLCL 0x0c
#define EC_HLBL 0x0d
#define EC_HLMS 0x0e

static int led_write(char *buf)
{
	char *cmd;
	int led, ind, ret;

	if (!led_supported)
		return -ENODEV;

	while ((cmd = next_cmd(&buf))) {
		if (sscanf(cmd, "%d", &led) != 1 || led < 0 || led > 7)
			return -EINVAL;

		if (strstr(cmd, "off")) {
			ind = 0;
		} else if (strstr(cmd, "on")) {
			ind = 1;
		} else if (strstr(cmd, "blink")) {
			ind = 2;
		} else
			return -EINVAL;

		if (led_supported == IBMACPI_LED_570) {
			/* 570 */
			led = 1 << led;
			if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
					led, led_sled_arg1[ind]))
				return -EIO;
		} else if (led_supported == IBMACPI_LED_OLD) {
			/* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20 */
			led = 1 << led;
			ret = ec_write(EC_HLMS, led);
			if (ret >= 0)
				ret =
				    ec_write(EC_HLBL, led * led_exp_hlbl[ind]);
			if (ret >= 0)
				ret =
				    ec_write(EC_HLCL, led * led_exp_hlcl[ind]);
			if (ret < 0)
				return ret;
		} else {
			/* all others */
			if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
					led, led_led_arg1[ind]))
				return -EIO;
		}
	}

	return 0;
}

static int beep_read(char *p)
{
	int len = 0;

	if (!beep_handle)
		len += sprintf(p + len, "status:\t\tnot supported\n");
	else {
		len += sprintf(p + len, "status:\t\tsupported\n");
		len += sprintf(p + len, "commands:\t<cmd> (<cmd> is 0-17)\n");
	}

	return len;
}

static int beep_write(char *buf)
{
	char *cmd;
	int beep_cmd;

	if (!beep_handle)
		return -ENODEV;

	while ((cmd = next_cmd(&buf))) {
		if (sscanf(cmd, "%u", &beep_cmd) == 1 &&
		    beep_cmd >= 0 && beep_cmd <= 17) {
			/* beep_cmd set */
		} else
			return -EINVAL;
		if (!acpi_evalf(beep_handle, NULL, NULL, "vdd", beep_cmd, 0))
			return -EIO;
	}

	return 0;
}

static int acpi_ec_read(int i, u8 * p)
{
	int v;

	if (ecrd_handle) {
		if (!acpi_evalf(ecrd_handle, &v, NULL, "dd", i))
			return 0;
		*p = v;
	} else {
		if (ec_read(i, p) < 0)
			return 0;
	}

	return 1;
}

static int acpi_ec_write(int i, u8 v)
{
	if (ecwr_handle) {
		if (!acpi_evalf(ecwr_handle, NULL, NULL, "vdd", i, v))
			return 0;
	} else {
		if (ec_write(i, v) < 0)
			return 0;
	}

	return 1;
}

static enum thermal_access_mode thermal_read_mode;

static int thermal_init(void)
{
	u8 t, ta1, ta2;
	int i;
	int acpi_tmp7 = acpi_evalf(ec_handle, NULL, "TMP7", "qv");

	if (ibm_thinkpad_ec_found && experimental) {
		/*
		 * Direct EC access mode: sensors at registers
		 * 0x78-0x7F, 0xC0-0xC7.  Registers return 0x00 for
		 * non-implemented, thermal sensors return 0x80 when
		 * not available
		 */

		ta1 = ta2 = 0;
		for (i = 0; i < 8; i++) {
			if (likely(acpi_ec_read(0x78 + i, &t))) {
				ta1 |= t;
			} else {
				ta1 = 0;
				break;
			}
			if (likely(acpi_ec_read(0xC0 + i, &t))) {
				ta2 |= t;
			} else {
				ta1 = 0;
				break;
			}
		}
		if (ta1 == 0) {
			/* This is sheer paranoia, but we handle it anyway */
			if (acpi_tmp7) {
				printk(IBM_ERR
				       "ThinkPad ACPI EC access misbehaving, "
				       "falling back to ACPI TMPx access mode\n");
				thermal_read_mode = IBMACPI_THERMAL_ACPI_TMP07;
			} else {
				printk(IBM_ERR
				       "ThinkPad ACPI EC access misbehaving, "
				       "disabling thermal sensors access\n");
				thermal_read_mode = IBMACPI_THERMAL_NONE;
			}
		} else {
			thermal_read_mode =
			    (ta2 != 0) ?
			    IBMACPI_THERMAL_TPEC_16 : IBMACPI_THERMAL_TPEC_8;
		}
	} else if (acpi_tmp7) {
		if (acpi_evalf(ec_handle, NULL, "UPDT", "qv")) {
			/* 600e/x, 770e, 770x */
			thermal_read_mode = IBMACPI_THERMAL_ACPI_UPDT;
		} else {
			/* Standard ACPI TMPx access, max 8 sensors */
			thermal_read_mode = IBMACPI_THERMAL_ACPI_TMP07;
		}
	} else {
		/* temperatures not supported on 570, G4x, R30, R31, R32 */
		thermal_read_mode = IBMACPI_THERMAL_NONE;
	}

	return 0;
}

static int thermal_get_sensors(struct ibm_thermal_sensors_struct *s)
{
	int i, t;
	s8 tmp;
	char tmpi[] = "TMPi";

	if (!s)
		return -EINVAL;

	switch (thermal_read_mode) {
#if IBMACPI_MAX_THERMAL_SENSORS >= 16
	case IBMACPI_THERMAL_TPEC_16:
		for (i = 0; i < 8; i++) {
			if (!acpi_ec_read(0xC0 + i, &tmp))
				return -EIO;
			s->temp[i + 8] = tmp * 1000;
		}
		/* fallthrough */
#endif
	case IBMACPI_THERMAL_TPEC_8:
		for (i = 0; i < 8; i++) {
			if (!acpi_ec_read(0x78 + i, &tmp))
				return -EIO;
			s->temp[i] = tmp * 1000;
		}
		return (thermal_read_mode == IBMACPI_THERMAL_TPEC_16) ? 16 : 8;

	case IBMACPI_THERMAL_ACPI_UPDT:
		if (!acpi_evalf(ec_handle, NULL, "UPDT", "v"))
			return -EIO;
		for (i = 0; i < 8; i++) {
			tmpi[3] = '0' + i;
			if (!acpi_evalf(ec_handle, &t, tmpi, "d"))
				return -EIO;
			s->temp[i] = (t - 2732) * 100;
		}
		return 8;

	case IBMACPI_THERMAL_ACPI_TMP07:
		for (i = 0; i < 8; i++) {
			tmpi[3] = '0' + i;
			if (!acpi_evalf(ec_handle, &t, tmpi, "d"))
				return -EIO;
			s->temp[i] = t * 1000;
		}
		return 8;

	case IBMACPI_THERMAL_NONE:
	default:
		return 0;
	}
}

static int thermal_read(char *p)
{
	int len = 0;
	int n, i;
	struct ibm_thermal_sensors_struct t;

	n = thermal_get_sensors(&t);
	if (unlikely(n < 0))
		return n;

	len += sprintf(p + len, "temperatures:\t");

	if (n > 0) {
		for (i = 0; i < (n - 1); i++)
			len += sprintf(p + len, "%d ", t.temp[i] / 1000);
		len += sprintf(p + len, "%d\n", t.temp[i] / 1000);
	} else
		len += sprintf(p + len, "not supported\n");

	return len;
}

static u8 ecdump_regs[256];

static int ecdump_read(char *p)
{
	int len = 0;
	int i, j;
	u8 v;

	len += sprintf(p + len, "EC      "
		       " +00 +01 +02 +03 +04 +05 +06 +07"
		       " +08 +09 +0a +0b +0c +0d +0e +0f\n");
	for (i = 0; i < 256; i += 16) {
		len += sprintf(p + len, "EC 0x%02x:", i);
		for (j = 0; j < 16; j++) {
			if (!acpi_ec_read(i + j, &v))
				break;
			if (v != ecdump_regs[i + j])
				len += sprintf(p + len, " *%02x", v);
			else
				len += sprintf(p + len, "  %02x", v);
			ecdump_regs[i + j] = v;
		}
		len += sprintf(p + len, "\n");
		if (j != 16)
			break;
	}

	/* These are way too dangerous to advertise openly... */
#if 0
	len += sprintf(p + len, "commands:\t0x<offset> 0x<value>"
		       " (<offset> is 00-ff, <value> is 00-ff)\n");
	len += sprintf(p + len, "commands:\t0x<offset> <value>  "
		       " (<offset> is 00-ff, <value> is 0-255)\n");
#endif
	return len;
}

static int ecdump_write(char *buf)
{
	char *cmd;
	int i, v;

	while ((cmd = next_cmd(&buf))) {
		if (sscanf(cmd, "0x%x 0x%x", &i, &v) == 2) {
			/* i and v set */
		} else if (sscanf(cmd, "0x%x %u", &i, &v) == 2) {
			/* i and v set */
		} else
			return -EINVAL;
		if (i >= 0 && i < 256 && v >= 0 && v < 256) {
			if (!acpi_ec_write(i, v))
				return -EIO;
		} else
			return -EINVAL;
	}

	return 0;
}

static int brightness_offset = 0x31;

static int brightness_get(struct backlight_device *bd)
{
	u8 level;
	if (!acpi_ec_read(brightness_offset, &level))
		return -EIO;

	level &= 0x7;

	return level;
}

static int brightness_read(char *p)
{
	int len = 0;
	int level;

	if ((level = brightness_get(NULL)) < 0) {
		len += sprintf(p + len, "level:\t\tunreadable\n");
	} else {
		len += sprintf(p + len, "level:\t\t%d\n", level & 0x7);
		len += sprintf(p + len, "commands:\tup, down\n");
		len += sprintf(p + len, "commands:\tlevel <level>"
			       " (<level> is 0-7)\n");
	}

	return len;
}

#define BRIGHTNESS_UP	4
#define BRIGHTNESS_DOWN	5

static int brightness_set(int value)
{
	int cmos_cmd, inc, i;
	int current_value = brightness_get(NULL);

	value &= 7;

	cmos_cmd = value > current_value ? BRIGHTNESS_UP : BRIGHTNESS_DOWN;
	inc = value > current_value ? 1 : -1;
	for (i = current_value; i != value; i += inc) {
		if (!cmos_eval(cmos_cmd))
			return -EIO;
		if (!acpi_ec_write(brightness_offset, i + inc))
			return -EIO;
	}

	return 0;
}

static int brightness_write(char *buf)
{
	int level;
	int new_level;
	char *cmd;

	while ((cmd = next_cmd(&buf))) {
		if ((level = brightness_get(NULL)) < 0)
			return level;
		level &= 7;

		if (strlencmp(cmd, "up") == 0) {
			new_level = level == 7 ? 7 : level + 1;
		} else if (strlencmp(cmd, "down") == 0) {
			new_level = level == 0 ? 0 : level - 1;
		} else if (sscanf(cmd, "level %d", &new_level) == 1 &&
			   new_level >= 0 && new_level <= 7) {
			/* new_level set */
		} else
			return -EINVAL;

		brightness_set(new_level);
	}

	return 0;
}

static int brightness_update_status(struct backlight_device *bd)
{
	return brightness_set(bd->props->brightness);
}

static struct backlight_properties ibm_backlight_data = {
        .owner          = THIS_MODULE,
        .get_brightness = brightness_get,
        .update_status  = brightness_update_status,
        .max_brightness = 7,
};

static int brightness_init(void)
{
	ibm_backlight_device = backlight_device_register("ibm", NULL, NULL,
							 &ibm_backlight_data);
	if (IS_ERR(ibm_backlight_device)) {
		printk(IBM_ERR "Could not register backlight device\n");
		return PTR_ERR(ibm_backlight_device);
	}

	return 0;
}

static void brightness_exit(void)
{
	if (ibm_backlight_device) {
		backlight_device_unregister(ibm_backlight_device);
		ibm_backlight_device = NULL;
	}
}

static int volume_offset = 0x30;

static int volume_read(char *p)
{
	int len = 0;
	u8 level;

	if (!acpi_ec_read(volume_offset, &level)) {
		len += sprintf(p + len, "level:\t\tunreadable\n");
	} else {
		len += sprintf(p + len, "level:\t\t%d\n", level & 0xf);
		len += sprintf(p + len, "mute:\t\t%s\n", onoff(level, 6));
		len += sprintf(p + len, "commands:\tup, down, mute\n");
		len += sprintf(p + len, "commands:\tlevel <level>"
			       " (<level> is 0-15)\n");
	}

	return len;
}

#define VOLUME_DOWN	0
#define VOLUME_UP	1
#define VOLUME_MUTE	2

static int volume_write(char *buf)
{
	int cmos_cmd, inc, i;
	u8 level, mute;
	int new_level, new_mute;
	char *cmd;

	while ((cmd = next_cmd(&buf))) {
		if (!acpi_ec_read(volume_offset, &level))
			return -EIO;
		new_mute = mute = level & 0x40;
		new_level = level = level & 0xf;

		if (strlencmp(cmd, "up") == 0) {
			if (mute)
				new_mute = 0;
			else
				new_level = level == 15 ? 15 : level + 1;
		} else if (strlencmp(cmd, "down") == 0) {
			if (mute)
				new_mute = 0;
			else
				new_level = level == 0 ? 0 : level - 1;
		} else if (sscanf(cmd, "level %d", &new_level) == 1 &&
			   new_level >= 0 && new_level <= 15) {
			/* new_level set */
		} else if (strlencmp(cmd, "mute") == 0) {
			new_mute = 0x40;
		} else
			return -EINVAL;

		if (new_level != level) {	/* mute doesn't change */
			cmos_cmd = new_level > level ? VOLUME_UP : VOLUME_DOWN;
			inc = new_level > level ? 1 : -1;

			if (mute && (!cmos_eval(cmos_cmd) ||
				     !acpi_ec_write(volume_offset, level)))
				return -EIO;

			for (i = level; i != new_level; i += inc)
				if (!cmos_eval(cmos_cmd) ||
				    !acpi_ec_write(volume_offset, i + inc))
					return -EIO;

			if (mute && (!cmos_eval(VOLUME_MUTE) ||
				     !acpi_ec_write(volume_offset,
						    new_level + mute)))
				return -EIO;
		}

		if (new_mute != mute) {	/* level doesn't change */
			cmos_cmd = new_mute ? VOLUME_MUTE : VOLUME_UP;

			if (!cmos_eval(cmos_cmd) ||
			    !acpi_ec_write(volume_offset, level + new_mute))
				return -EIO;
		}
	}

	return 0;
}

static enum fan_status_access_mode fan_status_access_mode;
static enum fan_control_access_mode fan_control_access_mode;
static enum fan_control_commands fan_control_commands;

static int fan_control_status_known;
static u8 fan_control_initial_status;

static void fan_watchdog_fire(struct work_struct *ignored);
static int fan_watchdog_maxinterval;
static DECLARE_DELAYED_WORK(fan_watchdog_task, fan_watchdog_fire);

static int fan_init(void)
{
	fan_status_access_mode = IBMACPI_FAN_NONE;
	fan_control_access_mode = IBMACPI_FAN_WR_NONE;
	fan_control_commands = 0;
	fan_control_status_known = 1;
	fan_watchdog_maxinterval = 0;

	if (gfan_handle) {
		/* 570, 600e/x, 770e, 770x */
		fan_status_access_mode = IBMACPI_FAN_RD_ACPI_GFAN;
	} else {
		/* all other ThinkPads: note that even old-style
		 * ThinkPad ECs supports the fan control register */
		if (likely(acpi_ec_read(fan_status_offset,
					&fan_control_initial_status))) {
			fan_status_access_mode = IBMACPI_FAN_RD_TPEC;

			/* In some ThinkPads, neither the EC nor the ACPI
			 * DSDT initialize the fan status, and it ends up
			 * being set to 0x07 when it *could* be either
			 * 0x07 or 0x80.
			 *
			 * Enable for TP-1Y (T43), TP-78 (R51e),
			 * TP-76 (R52), TP-70 (T43, R52), which are known
			 * to be buggy. */
			if (fan_control_initial_status == 0x07 &&
			    ibm_thinkpad_ec_found &&
			    ((ibm_thinkpad_ec_found[0] == '1' &&
			      ibm_thinkpad_ec_found[1] == 'Y') ||
			     (ibm_thinkpad_ec_found[0] == '7' &&
			      (ibm_thinkpad_ec_found[1] == '6' ||
			       ibm_thinkpad_ec_found[1] == '8' ||
			       ibm_thinkpad_ec_found[1] == '0'))
			    )) {
				printk(IBM_NOTICE
				       "fan_init: initial fan status is "
				       "unknown, assuming it is in auto "
				       "mode\n");
				fan_control_status_known = 0;
			}
		} else {
			printk(IBM_ERR
			       "ThinkPad ACPI EC access misbehaving, "
			       "fan status and control unavailable\n");
			return 0;
		}
	}

	if (sfan_handle) {
		/* 570, 770x-JL */
		fan_control_access_mode = IBMACPI_FAN_WR_ACPI_SFAN;
		fan_control_commands |=
		    IBMACPI_FAN_CMD_LEVEL | IBMACPI_FAN_CMD_ENABLE;
	} else {
		if (!gfan_handle) {
			/* gfan without sfan means no fan control */
			/* all other models implement TP EC 0x2f control */

			if (fans_handle) {
				/* X31, X40, X41 */
				fan_control_access_mode =
				    IBMACPI_FAN_WR_ACPI_FANS;
				fan_control_commands |=
				    IBMACPI_FAN_CMD_SPEED |
				    IBMACPI_FAN_CMD_LEVEL |
				    IBMACPI_FAN_CMD_ENABLE;
			} else {
				fan_control_access_mode = IBMACPI_FAN_WR_TPEC;
				fan_control_commands |=
				    IBMACPI_FAN_CMD_LEVEL |
				    IBMACPI_FAN_CMD_ENABLE;
			}
		}
	}

	return 0;
}

static int fan_get_status(u8 *status)
{
	u8 s;

	/* TODO:
	 * Add IBMACPI_FAN_RD_ACPI_FANS ? */

	switch (fan_status_access_mode) {
	case IBMACPI_FAN_RD_ACPI_GFAN:
		/* 570, 600e/x, 770e, 770x */

		if (unlikely(!acpi_evalf(gfan_handle, &s, NULL, "d")))
			return -EIO;

		if (likely(status))
			*status = s & 0x07;

		break;

	case IBMACPI_FAN_RD_TPEC:
		/* all except 570, 600e/x, 770e, 770x */
		if (unlikely(!acpi_ec_read(fan_status_offset, &s)))
			return -EIO;

		if (likely(status))
			*status = s;

		break;

	default:
		return -ENXIO;
	}

	return 0;
}

static int fan_get_speed(unsigned int *speed)
{
	u8 hi, lo;

	switch (fan_status_access_mode) {
	case IBMACPI_FAN_RD_TPEC:
		/* all except 570, 600e/x, 770e, 770x */
		if (unlikely(!acpi_ec_read(fan_rpm_offset, &lo) ||
			     !acpi_ec_read(fan_rpm_offset + 1, &hi)))
			return -EIO;

		if (likely(speed))
			*speed = (hi << 8) | lo;

		break;

	default:
		return -ENXIO;
	}

	return 0;
}

static void fan_exit(void)
{
	cancel_delayed_work(&fan_watchdog_task);
	flush_scheduled_work();
}

static void fan_watchdog_reset(void)
{
	static int fan_watchdog_active = 0;

	if (fan_watchdog_active)
		cancel_delayed_work(&fan_watchdog_task);

	if (fan_watchdog_maxinterval > 0) {
		fan_watchdog_active = 1;
		if (!schedule_delayed_work(&fan_watchdog_task,
				msecs_to_jiffies(fan_watchdog_maxinterval
						 * 1000))) {
			printk(IBM_ERR "failed to schedule the fan watchdog, "
			       "watchdog will not trigger\n");
		}
	} else
		fan_watchdog_active = 0;
}

static int fan_read(char *p)
{
	int len = 0;
	int rc;
	u8 status;
	unsigned int speed = 0;

	switch (fan_status_access_mode) {
	case IBMACPI_FAN_RD_ACPI_GFAN:
		/* 570, 600e/x, 770e, 770x */
		if ((rc = fan_get_status(&status)) < 0)
			return rc;

		len += sprintf(p + len, "status:\t\t%s\n"
			       "level:\t\t%d\n",
			       (status != 0) ? "enabled" : "disabled", status);
		break;

	case IBMACPI_FAN_RD_TPEC:
		/* all except 570, 600e/x, 770e, 770x */
		if ((rc = fan_get_status(&status)) < 0)
			return rc;

		if (unlikely(!fan_control_status_known)) {
			if (status != fan_control_initial_status)
				fan_control_status_known = 1;
			else
				/* Return most likely status. In fact, it
				 * might be the only possible status */
				status = IBMACPI_FAN_EC_AUTO;
		}

		len += sprintf(p + len, "status:\t\t%s\n",
			       (status != 0) ? "enabled" : "disabled");

		/* No ThinkPad boots on disengaged mode, we can safely
		 * assume the tachometer is online if fan control status
		 * was unknown */
		if ((rc = fan_get_speed(&speed)) < 0)
			return rc;

		len += sprintf(p + len, "speed:\t\t%d\n", speed);

		if (status & IBMACPI_FAN_EC_DISENGAGED)
			/* Disengaged mode takes precedence */
			len += sprintf(p + len, "level:\t\tdisengaged\n");
		else if (status & IBMACPI_FAN_EC_AUTO)
			len += sprintf(p + len, "level:\t\tauto\n");
		else
			len += sprintf(p + len, "level:\t\t%d\n", status);
		break;

	case IBMACPI_FAN_NONE:
	default:
		len += sprintf(p + len, "status:\t\tnot supported\n");
	}

	if (fan_control_commands & IBMACPI_FAN_CMD_LEVEL) {
		len += sprintf(p + len, "commands:\tlevel <level>");

		switch (fan_control_access_mode) {
		case IBMACPI_FAN_WR_ACPI_SFAN:
			len += sprintf(p + len, " (<level> is 0-7)\n");
			break;

		default:
			len += sprintf(p + len, " (<level> is 0-7, "
				       "auto, disengaged)\n");
			break;
		}
	}

	if (fan_control_commands & IBMACPI_FAN_CMD_ENABLE)
		len += sprintf(p + len, "commands:\tenable, disable\n"
			       "commands:\twatchdog <timeout> (<timeout> is 0 (off), "
			       "1-120 (seconds))\n");

	if (fan_control_commands & IBMACPI_FAN_CMD_SPEED)
		len += sprintf(p + len, "commands:\tspeed <speed>"
			       " (<speed> is 0-65535)\n");

	return len;
}

static int fan_set_level(int level)
{
	switch (fan_control_access_mode) {
	case IBMACPI_FAN_WR_ACPI_SFAN:
		if (level >= 0 && level <= 7) {
			if (!acpi_evalf(sfan_handle, NULL, NULL, "vd", level))
				return -EIO;
		} else
			return -EINVAL;
		break;

	case IBMACPI_FAN_WR_ACPI_FANS:
	case IBMACPI_FAN_WR_TPEC:
		if ((level != IBMACPI_FAN_EC_AUTO) &&
		    (level != IBMACPI_FAN_EC_DISENGAGED) &&
		    ((level < 0) || (level > 7)))
			return -EINVAL;

		if (!acpi_ec_write(fan_status_offset, level))
			return -EIO;
		else
			fan_control_status_known = 1;
		break;

	default:
		return -ENXIO;
	}
	return 0;
}

static int fan_set_enable(void)
{
	u8 s;
	int rc;

	switch (fan_control_access_mode) {
	case IBMACPI_FAN_WR_ACPI_FANS:
	case IBMACPI_FAN_WR_TPEC:
		if ((rc = fan_get_status(&s)) < 0)
			return rc;

		/* Don't go out of emergency fan mode */
		if (s != 7)
			s = IBMACPI_FAN_EC_AUTO;

		if (!acpi_ec_write(fan_status_offset, s))
			return -EIO;
		else
			fan_control_status_known = 1;
		break;

	case IBMACPI_FAN_WR_ACPI_SFAN:
		if ((rc = fan_get_status(&s)) < 0)
			return rc;

		s &= 0x07;

		/* Set fan to at least level 4 */
		if (s < 4)
			s = 4;

		if (!acpi_evalf(sfan_handle, NULL, NULL, "vd", s))
			return -EIO;
		break;

	default:
		return -ENXIO;
	}
	return 0;
}

static int fan_set_disable(void)
{
	switch (fan_control_access_mode) {
	case IBMACPI_FAN_WR_ACPI_FANS:
	case IBMACPI_FAN_WR_TPEC:
		if (!acpi_ec_write(fan_status_offset, 0x00))
			return -EIO;
		else
			fan_control_status_known = 1;
		break;

	case IBMACPI_FAN_WR_ACPI_SFAN:
		if (!acpi_evalf(sfan_handle, NULL, NULL, "vd", 0x00))
			return -EIO;
		break;

	default:
		return -ENXIO;
	}
	return 0;
}

static int fan_set_speed(int speed)
{
	switch (fan_control_access_mode) {
	case IBMACPI_FAN_WR_ACPI_FANS:
		if (speed >= 0 && speed <= 65535) {
			if (!acpi_evalf(fans_handle, NULL, NULL, "vddd",
					speed, speed, speed))
				return -EIO;
		} else
			return -EINVAL;
		break;

	default:
		return -ENXIO;
	}
	return 0;
}

static int fan_write_cmd_level(const char *cmd, int *rc)
{
	int level;

	if (strlencmp(cmd, "level auto") == 0)
		level = IBMACPI_FAN_EC_AUTO;
	else if (strlencmp(cmd, "level disengaged") == 0)
		level = IBMACPI_FAN_EC_DISENGAGED;
	else if (sscanf(cmd, "level %d", &level) != 1)
		return 0;

	if ((*rc = fan_set_level(level)) == -ENXIO)
		printk(IBM_ERR "level command accepted for unsupported "
		       "access mode %d", fan_control_access_mode);

	return 1;
}

static int fan_write_cmd_enable(const char *cmd, int *rc)
{
	if (strlencmp(cmd, "enable") != 0)
		return 0;

	if ((*rc = fan_set_enable()) == -ENXIO)
		printk(IBM_ERR "enable command accepted for unsupported "
		       "access mode %d", fan_control_access_mode);

	return 1;
}

static int fan_write_cmd_disable(const char *cmd, int *rc)
{
	if (strlencmp(cmd, "disable") != 0)
		return 0;

	if ((*rc = fan_set_disable()) == -ENXIO)
		printk(IBM_ERR "disable command accepted for unsupported "
		       "access mode %d", fan_control_access_mode);

	return 1;
}

static int fan_write_cmd_speed(const char *cmd, int *rc)
{
	int speed;

	/* TODO:
	 * Support speed <low> <medium> <high> ? */

	if (sscanf(cmd, "speed %d", &speed) != 1)
		return 0;

	if ((*rc = fan_set_speed(speed)) == -ENXIO)
		printk(IBM_ERR "speed command accepted for unsupported "
		       "access mode %d", fan_control_access_mode);

	return 1;
}

static int fan_write_cmd_watchdog(const char *cmd, int *rc)
{
	int interval;

	if (sscanf(cmd, "watchdog %d", &interval) != 1)
		return 0;

	if (interval < 0 || interval > 120)
		*rc = -EINVAL;
	else
		fan_watchdog_maxinterval = interval;

	return 1;
}

static int fan_write(char *buf)
{
	char *cmd;
	int rc = 0;

	while (!rc && (cmd = next_cmd(&buf))) {
		if (!((fan_control_commands & IBMACPI_FAN_CMD_LEVEL) &&
		      fan_write_cmd_level(cmd, &rc)) &&
		    !((fan_control_commands & IBMACPI_FAN_CMD_ENABLE) &&
		      (fan_write_cmd_enable(cmd, &rc) ||
		       fan_write_cmd_disable(cmd, &rc) ||
		       fan_write_cmd_watchdog(cmd, &rc))) &&
		    !((fan_control_commands & IBMACPI_FAN_CMD_SPEED) &&
		      fan_write_cmd_speed(cmd, &rc))
		    )
			rc = -EINVAL;
		else if (!rc)
			fan_watchdog_reset();
	}

	return rc;
}

static void fan_watchdog_fire(struct work_struct *ignored)
{
	printk(IBM_NOTICE "fan watchdog: enabling fan\n");
	if (fan_set_enable()) {
		printk(IBM_ERR "fan watchdog: error while enabling fan\n");
		/* reschedule for later */
		fan_watchdog_reset();
	}
}

static struct ibm_struct ibms[] = {
	{
	 .name = "driver",
	 .init = ibm_acpi_driver_init,
	 .read = driver_read,
	 },
	{
	 .name = "hotkey",
	 .hid = IBM_HKEY_HID,
	 .init = hotkey_init,
	 .read = hotkey_read,
	 .write = hotkey_write,
	 .exit = hotkey_exit,
	 .notify = hotkey_notify,
	 .handle = &hkey_handle,
	 .type = ACPI_DEVICE_NOTIFY,
	 },
	{
	 .name = "bluetooth",
	 .init = bluetooth_init,
	 .read = bluetooth_read,
	 .write = bluetooth_write,
	 },
	{
	 .name = "wan",
	 .init = wan_init,
	 .read = wan_read,
	 .write = wan_write,
	 .experimental = 1,
	 },
	{
	 .name = "video",
	 .init = video_init,
	 .read = video_read,
	 .write = video_write,
	 .exit = video_exit,
	 },
	{
	 .name = "light",
	 .init = light_init,
	 .read = light_read,
	 .write = light_write,
	 },
#ifdef CONFIG_ACPI_IBM_DOCK
	{
	 .name = "dock",
	 .read = dock_read,
	 .write = dock_write,
	 .notify = dock_notify,
	 .handle = &dock_handle,
	 .type = ACPI_SYSTEM_NOTIFY,
	 },
	{
	 .name = "dock",
	 .hid = IBM_PCI_HID,
	 .notify = dock_notify,
	 .handle = &pci_handle,
	 .type = ACPI_SYSTEM_NOTIFY,
	 },
#endif
	{
	 .name = "bay",
	 .init = bay_init,
	 .read = bay_read,
	 .write = bay_write,
	 .notify = bay_notify,
	 .handle = &bay_handle,
	 .type = ACPI_SYSTEM_NOTIFY,
	 },
	{
	 .name = "cmos",
	 .read = cmos_read,
	 .write = cmos_write,
	 },
	{
	 .name = "led",
	 .init = led_init,
	 .read = led_read,
	 .write = led_write,
	 },
	{
	 .name = "beep",
	 .read = beep_read,
	 .write = beep_write,
	 },
	{
	 .name = "thermal",
	 .init = thermal_init,
	 .read = thermal_read,
	 },
	{
	 .name = "ecdump",
	 .read = ecdump_read,
	 .write = ecdump_write,
	 .experimental = 1,
	 },
	{
	 .name = "brightness",
	 .read = brightness_read,
	 .write = brightness_write,
	 .init = brightness_init,
	 .exit = brightness_exit,
	 },
	{
	 .name = "volume",
	 .read = volume_read,
	 .write = volume_write,
	 },
	{
	 .name = "fan",
	 .read = fan_read,
	 .write = fan_write,
	 .init = fan_init,
	 .exit = fan_exit,
	 .experimental = 1,
	 },
};

static int dispatch_read(char *page, char **start, off_t off, int count,
			 int *eof, void *data)
{
	struct ibm_struct *ibm = data;
	int len;

	if (!ibm || !ibm->read)
		return -EINVAL;

	len = ibm->read(page);
	if (len < 0)
		return len;

	if (len <= off + count)
		*eof = 1;
	*start = page + off;
	len -= off;
	if (len > count)
		len = count;
	if (len < 0)
		len = 0;

	return len;
}

static int dispatch_write(struct file *file, const char __user * userbuf,
			  unsigned long count, void *data)
{
	struct ibm_struct *ibm = data;
	char *kernbuf;
	int ret;

	if (!ibm || !ibm->write)
		return -EINVAL;

	kernbuf = kmalloc(count + 2, GFP_KERNEL);
	if (!kernbuf)
		return -ENOMEM;

	if (copy_from_user(kernbuf, userbuf, count)) {
		kfree(kernbuf);
		return -EFAULT;
	}

	kernbuf[count] = 0;
	strcat(kernbuf, ",");
	ret = ibm->write(kernbuf);
	if (ret == 0)
		ret = count;

	kfree(kernbuf);

	return ret;
}

static void dispatch_notify(acpi_handle handle, u32 event, void *data)
{
	struct ibm_struct *ibm = data;

	if (!ibm || !ibm->notify)
		return;

	ibm->notify(ibm, event);
}

static int __init setup_notify(struct ibm_struct *ibm)
{
	acpi_status status;
	int ret;

	if (!*ibm->handle)
		return 0;

	ret = acpi_bus_get_device(*ibm->handle, &ibm->device);
	if (ret < 0) {
		printk(IBM_ERR "%s device not present\n", ibm->name);
		return 0;
	}

	acpi_driver_data(ibm->device) = ibm;
	sprintf(acpi_device_class(ibm->device), "%s/%s", IBM_NAME, ibm->name);

	status = acpi_install_notify_handler(*ibm->handle, ibm->type,
					     dispatch_notify, ibm);
	if (ACPI_FAILURE(status)) {
		printk(IBM_ERR "acpi_install_notify_handler(%s) failed: %d\n",
		       ibm->name, status);
		return -ENODEV;
	}
	ibm->notify_installed = 1;
	return 0;
}

static int __init ibm_device_add(struct acpi_device *device)
{
	return 0;
}

static int __init register_driver(struct ibm_struct *ibm)
{
	int ret;

	ibm->driver = kzalloc(sizeof(struct acpi_driver), GFP_KERNEL);
	if (!ibm->driver) {
		printk(IBM_ERR "kmalloc(ibm->driver) failed\n");
		return -1;
	}

	sprintf(ibm->driver->name, "%s_%s", IBM_NAME, ibm->name);
	ibm->driver->ids = ibm->hid;
	ibm->driver->ops.add = &ibm_device_add;

	ret = acpi_bus_register_driver(ibm->driver);
	if (ret < 0) {
		printk(IBM_ERR "acpi_bus_register_driver(%s) failed: %d\n",
		       ibm->hid, ret);
		kfree(ibm->driver);
	}

	return ret;
}

static int __init ibm_init(struct ibm_struct *ibm)
{
	int ret;
	struct proc_dir_entry *entry;

	if (ibm->experimental && !experimental)
		return 0;

	if (ibm->hid) {
		ret = register_driver(ibm);
		if (ret < 0)
			return ret;
		ibm->driver_registered = 1;
	}

	if (ibm->init) {
		ret = ibm->init();
		if (ret != 0)
			return ret;
		ibm->init_called = 1;
	}

	if (ibm->read) {
		entry = create_proc_entry(ibm->name,
					  S_IFREG | S_IRUGO | S_IWUSR,
					  proc_dir);
		if (!entry) {
			printk(IBM_ERR "unable to create proc entry %s\n",
			       ibm->name);
			return -ENODEV;
		}
		entry->owner = THIS_MODULE;
		entry->data = ibm;
		entry->read_proc = &dispatch_read;
		if (ibm->write)
			entry->write_proc = &dispatch_write;
		ibm->proc_created = 1;
	}

	if (ibm->notify) {
		ret = setup_notify(ibm);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static void ibm_exit(struct ibm_struct *ibm)
{
	if (ibm->notify_installed)
		acpi_remove_notify_handler(*ibm->handle, ibm->type,
					   dispatch_notify);

	if (ibm->proc_created)
		remove_proc_entry(ibm->name, proc_dir);

	if (ibm->init_called && ibm->exit)
		ibm->exit();

	if (ibm->driver_registered) {
		acpi_bus_unregister_driver(ibm->driver);
		kfree(ibm->driver);
	}
}

static void __init ibm_handle_init(char *name,
				   acpi_handle * handle, acpi_handle parent,
				   char **paths, int num_paths, char **path)
{
	int i;
	acpi_status status;

	for (i = 0; i < num_paths; i++) {
		status = acpi_get_handle(parent, paths[i], handle);
		if (ACPI_SUCCESS(status)) {
			*path = paths[i];
			return;
		}
	}

	*handle = NULL;
}

#define IBM_HANDLE_INIT(object)						\
	ibm_handle_init(#object, &object##_handle, *object##_parent,	\
		object##_paths, ARRAY_SIZE(object##_paths), &object##_path)

static int set_ibm_param(const char *val, struct kernel_param *kp)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(ibms); i++)
		if (strcmp(ibms[i].name, kp->name) == 0 && ibms[i].write) {
			if (strlen(val) > sizeof(ibms[i].param) - 2)
				return -ENOSPC;
			strcpy(ibms[i].param, val);
			strcat(ibms[i].param, ",");
			return 0;
		}

	return -EINVAL;
}

#define IBM_PARAM(feature) \
	module_param_call(feature, set_ibm_param, NULL, NULL, 0)

IBM_PARAM(hotkey);
IBM_PARAM(bluetooth);
IBM_PARAM(video);
IBM_PARAM(light);
#ifdef CONFIG_ACPI_IBM_DOCK
IBM_PARAM(dock);
#endif
IBM_PARAM(bay);
IBM_PARAM(cmos);
IBM_PARAM(led);
IBM_PARAM(beep);
IBM_PARAM(ecdump);
IBM_PARAM(brightness);
IBM_PARAM(volume);
IBM_PARAM(fan);

static void acpi_ibm_exit(void)
{
	int i;

	for (i = ARRAY_SIZE(ibms) - 1; i >= 0; i--)
		ibm_exit(&ibms[i]);

	remove_proc_entry(IBM_DIR, acpi_root_dir);

	if (ibm_thinkpad_ec_found)
		kfree(ibm_thinkpad_ec_found);
}

static char* __init check_dmi_for_ec(void)
{
	struct dmi_device *dev = NULL;
	char ec_fw_string[18];

	/*
	 * ThinkPad T23 or newer, A31 or newer, R50e or newer,
	 * X32 or newer, all Z series;  Some models must have an
	 * up-to-date BIOS or they will not be detected.
	 *
	 * See http://thinkwiki.org/wiki/List_of_DMI_IDs
	 */
	while ((dev = dmi_find_device(DMI_DEV_TYPE_OEM_STRING, NULL, dev))) {
		if (sscanf(dev->name,
			   "IBM ThinkPad Embedded Controller -[%17c",
			   ec_fw_string) == 1) {
			ec_fw_string[sizeof(ec_fw_string) - 1] = 0;
			ec_fw_string[strcspn(ec_fw_string, " ]")] = 0;
			return kstrdup(ec_fw_string, GFP_KERNEL);
		}
	}
	return NULL;
}

static int __init acpi_ibm_init(void)
{
	int ret, i;

	if (acpi_disabled)
		return -ENODEV;

	if (!acpi_specific_hotkey_enabled) {
		printk(IBM_ERR "using generic hotkey driver\n");
		return -ENODEV;
	}

	/* ec is required because many other handles are relative to it */
	IBM_HANDLE_INIT(ec);
	if (!ec_handle) {
		printk(IBM_ERR "ec object not found\n");
		return -ENODEV;
	}

	/* Models with newer firmware report the EC in DMI */
	ibm_thinkpad_ec_found = check_dmi_for_ec();
	if (ibm_thinkpad_ec_found)
		printk(IBM_INFO "ThinkPad EC firmware %s\n",
		       ibm_thinkpad_ec_found);

	/* these handles are not required */
	IBM_HANDLE_INIT(vid);
	IBM_HANDLE_INIT(vid2);
	IBM_HANDLE_INIT(ledb);
	IBM_HANDLE_INIT(led);
	IBM_HANDLE_INIT(hkey);
	IBM_HANDLE_INIT(lght);
	IBM_HANDLE_INIT(cmos);
#ifdef CONFIG_ACPI_IBM_DOCK
	IBM_HANDLE_INIT(dock);
#endif
	IBM_HANDLE_INIT(pci);
	IBM_HANDLE_INIT(bay);
	if (bay_handle)
		IBM_HANDLE_INIT(bay_ej);
	IBM_HANDLE_INIT(bay2);
	if (bay2_handle)
		IBM_HANDLE_INIT(bay2_ej);
	IBM_HANDLE_INIT(beep);
	IBM_HANDLE_INIT(ecrd);
	IBM_HANDLE_INIT(ecwr);
	IBM_HANDLE_INIT(fans);
	IBM_HANDLE_INIT(gfan);
	IBM_HANDLE_INIT(sfan);

	proc_dir = proc_mkdir(IBM_DIR, acpi_root_dir);
	if (!proc_dir) {
		printk(IBM_ERR "unable to create proc dir %s", IBM_DIR);
		return -ENODEV;
	}
	proc_dir->owner = THIS_MODULE;

	for (i = 0; i < ARRAY_SIZE(ibms); i++) {
		ret = ibm_init(&ibms[i]);
		if (ret >= 0 && *ibms[i].param)
			ret = ibms[i].write(ibms[i].param);
		if (ret < 0) {
			acpi_ibm_exit();
			return ret;
		}
	}

	return 0;
}

module_init(acpi_ibm_init);
module_exit(acpi_ibm_exit);