summaryrefslogtreecommitdiff
path: root/drivers/usb/core/hcd.c
blob: 3e01dd6e509b607e8e63ac8a6740fe3235d351df (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
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright Linus Torvalds 1999
 * (C) Copyright Johannes Erdfelt 1999-2001
 * (C) Copyright Andreas Gal 1999
 * (C) Copyright Gregory P. Smith 1999
 * (C) Copyright Deti Fliegl 1999
 * (C) Copyright Randy Dunlap 2000
 * (C) Copyright David Brownell 2000-2002
 */

#include <linux/bcd.h>
#include <linux/module.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/sched/task_stack.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/utsname.h>
#include <linux/mm.h>
#include <asm/io.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/mutex.h>
#include <asm/irq.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/pm_runtime.h>
#include <linux/types.h>
#include <linux/genalloc.h>
#include <linux/io.h>
#include <linux/kcov.h>

#include <linux/phy/phy.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/otg.h>

#include "usb.h"
#include "phy.h"


/*-------------------------------------------------------------------------*/

/*
 * USB Host Controller Driver framework
 *
 * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
 * HCD-specific behaviors/bugs.
 *
 * This does error checks, tracks devices and urbs, and delegates to a
 * "hc_driver" only for code (and data) that really needs to know about
 * hardware differences.  That includes root hub registers, i/o queues,
 * and so on ... but as little else as possible.
 *
 * Shared code includes most of the "root hub" code (these are emulated,
 * though each HC's hardware works differently) and PCI glue, plus request
 * tracking overhead.  The HCD code should only block on spinlocks or on
 * hardware handshaking; blocking on software events (such as other kernel
 * threads releasing resources, or completing actions) is all generic.
 *
 * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
 * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
 * only by the hub driver ... and that neither should be seen or used by
 * usb client device drivers.
 *
 * Contributors of ideas or unattributed patches include: David Brownell,
 * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
 *
 * HISTORY:
 * 2002-02-21	Pull in most of the usb_bus support from usb.c; some
 *		associated cleanup.  "usb_hcd" still != "usb_bus".
 * 2001-12-12	Initial patch version for Linux 2.5.1 kernel.
 */

/*-------------------------------------------------------------------------*/

/* Keep track of which host controller drivers are loaded */
unsigned long usb_hcds_loaded;
EXPORT_SYMBOL_GPL(usb_hcds_loaded);

/* host controllers we manage */
DEFINE_IDR (usb_bus_idr);
EXPORT_SYMBOL_GPL (usb_bus_idr);

/* used when allocating bus numbers */
#define USB_MAXBUS		64

/* used when updating list of hcds */
DEFINE_MUTEX(usb_bus_idr_lock);	/* exported only for usbfs */
EXPORT_SYMBOL_GPL (usb_bus_idr_lock);

/* used for controlling access to virtual root hubs */
static DEFINE_SPINLOCK(hcd_root_hub_lock);

/* used when updating an endpoint's URB list */
static DEFINE_SPINLOCK(hcd_urb_list_lock);

/* used to protect against unlinking URBs after the device is gone */
static DEFINE_SPINLOCK(hcd_urb_unlink_lock);

/* wait queue for synchronous unlinks */
DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);

/*-------------------------------------------------------------------------*/

/*
 * Sharable chunks of root hub code.
 */

/*-------------------------------------------------------------------------*/
#define KERNEL_REL	bin2bcd(LINUX_VERSION_MAJOR)
#define KERNEL_VER	bin2bcd(LINUX_VERSION_PATCHLEVEL)

/* usb 3.1 root hub device descriptor */
static const u8 usb31_rh_dev_descriptor[18] = {
	0x12,       /*  __u8  bLength; */
	USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
	0x10, 0x03, /*  __le16 bcdUSB; v3.1 */

	0x09,	    /*  __u8  bDeviceClass; HUB_CLASSCODE */
	0x00,	    /*  __u8  bDeviceSubClass; */
	0x03,       /*  __u8  bDeviceProtocol; USB 3 hub */
	0x09,       /*  __u8  bMaxPacketSize0; 2^9 = 512 Bytes */

	0x6b, 0x1d, /*  __le16 idVendor; Linux Foundation 0x1d6b */
	0x03, 0x00, /*  __le16 idProduct; device 0x0003 */
	KERNEL_VER, KERNEL_REL, /*  __le16 bcdDevice */

	0x03,       /*  __u8  iManufacturer; */
	0x02,       /*  __u8  iProduct; */
	0x01,       /*  __u8  iSerialNumber; */
	0x01        /*  __u8  bNumConfigurations; */
};

/* usb 3.0 root hub device descriptor */
static const u8 usb3_rh_dev_descriptor[18] = {
	0x12,       /*  __u8  bLength; */
	USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
	0x00, 0x03, /*  __le16 bcdUSB; v3.0 */

	0x09,	    /*  __u8  bDeviceClass; HUB_CLASSCODE */
	0x00,	    /*  __u8  bDeviceSubClass; */
	0x03,       /*  __u8  bDeviceProtocol; USB 3.0 hub */
	0x09,       /*  __u8  bMaxPacketSize0; 2^9 = 512 Bytes */

	0x6b, 0x1d, /*  __le16 idVendor; Linux Foundation 0x1d6b */
	0x03, 0x00, /*  __le16 idProduct; device 0x0003 */
	KERNEL_VER, KERNEL_REL, /*  __le16 bcdDevice */

	0x03,       /*  __u8  iManufacturer; */
	0x02,       /*  __u8  iProduct; */
	0x01,       /*  __u8  iSerialNumber; */
	0x01        /*  __u8  bNumConfigurations; */
};

/* usb 2.5 (wireless USB 1.0) root hub device descriptor */
static const u8 usb25_rh_dev_descriptor[18] = {
	0x12,       /*  __u8  bLength; */
	USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
	0x50, 0x02, /*  __le16 bcdUSB; v2.5 */

	0x09,	    /*  __u8  bDeviceClass; HUB_CLASSCODE */
	0x00,	    /*  __u8  bDeviceSubClass; */
	0x00,       /*  __u8  bDeviceProtocol; [ usb 2.0 no TT ] */
	0xFF,       /*  __u8  bMaxPacketSize0; always 0xFF (WUSB Spec 7.4.1). */

	0x6b, 0x1d, /*  __le16 idVendor; Linux Foundation 0x1d6b */
	0x02, 0x00, /*  __le16 idProduct; device 0x0002 */
	KERNEL_VER, KERNEL_REL, /*  __le16 bcdDevice */

	0x03,       /*  __u8  iManufacturer; */
	0x02,       /*  __u8  iProduct; */
	0x01,       /*  __u8  iSerialNumber; */
	0x01        /*  __u8  bNumConfigurations; */
};

/* usb 2.0 root hub device descriptor */
static const u8 usb2_rh_dev_descriptor[18] = {
	0x12,       /*  __u8  bLength; */
	USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
	0x00, 0x02, /*  __le16 bcdUSB; v2.0 */

	0x09,	    /*  __u8  bDeviceClass; HUB_CLASSCODE */
	0x00,	    /*  __u8  bDeviceSubClass; */
	0x00,       /*  __u8  bDeviceProtocol; [ usb 2.0 no TT ] */
	0x40,       /*  __u8  bMaxPacketSize0; 64 Bytes */

	0x6b, 0x1d, /*  __le16 idVendor; Linux Foundation 0x1d6b */
	0x02, 0x00, /*  __le16 idProduct; device 0x0002 */
	KERNEL_VER, KERNEL_REL, /*  __le16 bcdDevice */

	0x03,       /*  __u8  iManufacturer; */
	0x02,       /*  __u8  iProduct; */
	0x01,       /*  __u8  iSerialNumber; */
	0x01        /*  __u8  bNumConfigurations; */
};

/* no usb 2.0 root hub "device qualifier" descriptor: one speed only */

/* usb 1.1 root hub device descriptor */
static const u8 usb11_rh_dev_descriptor[18] = {
	0x12,       /*  __u8  bLength; */
	USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
	0x10, 0x01, /*  __le16 bcdUSB; v1.1 */

	0x09,	    /*  __u8  bDeviceClass; HUB_CLASSCODE */
	0x00,	    /*  __u8  bDeviceSubClass; */
	0x00,       /*  __u8  bDeviceProtocol; [ low/full speeds only ] */
	0x40,       /*  __u8  bMaxPacketSize0; 64 Bytes */

	0x6b, 0x1d, /*  __le16 idVendor; Linux Foundation 0x1d6b */
	0x01, 0x00, /*  __le16 idProduct; device 0x0001 */
	KERNEL_VER, KERNEL_REL, /*  __le16 bcdDevice */

	0x03,       /*  __u8  iManufacturer; */
	0x02,       /*  __u8  iProduct; */
	0x01,       /*  __u8  iSerialNumber; */
	0x01        /*  __u8  bNumConfigurations; */
};


/*-------------------------------------------------------------------------*/

/* Configuration descriptors for our root hubs */

static const u8 fs_rh_config_descriptor[] = {

	/* one configuration */
	0x09,       /*  __u8  bLength; */
	USB_DT_CONFIG, /* __u8 bDescriptorType; Configuration */
	0x19, 0x00, /*  __le16 wTotalLength; */
	0x01,       /*  __u8  bNumInterfaces; (1) */
	0x01,       /*  __u8  bConfigurationValue; */
	0x00,       /*  __u8  iConfiguration; */
	0xc0,       /*  __u8  bmAttributes;
				 Bit 7: must be set,
				     6: Self-powered,
				     5: Remote wakeup,
				     4..0: resvd */
	0x00,       /*  __u8  MaxPower; */

	/* USB 1.1:
	 * USB 2.0, single TT organization (mandatory):
	 *	one interface, protocol 0
	 *
	 * USB 2.0, multiple TT organization (optional):
	 *	two interfaces, protocols 1 (like single TT)
	 *	and 2 (multiple TT mode) ... config is
	 *	sometimes settable
	 *	NOT IMPLEMENTED
	 */

	/* one interface */
	0x09,       /*  __u8  if_bLength; */
	USB_DT_INTERFACE,  /* __u8 if_bDescriptorType; Interface */
	0x00,       /*  __u8  if_bInterfaceNumber; */
	0x00,       /*  __u8  if_bAlternateSetting; */
	0x01,       /*  __u8  if_bNumEndpoints; */
	0x09,       /*  __u8  if_bInterfaceClass; HUB_CLASSCODE */
	0x00,       /*  __u8  if_bInterfaceSubClass; */
	0x00,       /*  __u8  if_bInterfaceProtocol; [usb1.1 or single tt] */
	0x00,       /*  __u8  if_iInterface; */

	/* one endpoint (status change endpoint) */
	0x07,       /*  __u8  ep_bLength; */
	USB_DT_ENDPOINT, /* __u8 ep_bDescriptorType; Endpoint */
	0x81,       /*  __u8  ep_bEndpointAddress; IN Endpoint 1 */
	0x03,       /*  __u8  ep_bmAttributes; Interrupt */
	0x02, 0x00, /*  __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
	0xff        /*  __u8  ep_bInterval; (255ms -- usb 2.0 spec) */
};

static const u8 hs_rh_config_descriptor[] = {

	/* one configuration */
	0x09,       /*  __u8  bLength; */
	USB_DT_CONFIG, /* __u8 bDescriptorType; Configuration */
	0x19, 0x00, /*  __le16 wTotalLength; */
	0x01,       /*  __u8  bNumInterfaces; (1) */
	0x01,       /*  __u8  bConfigurationValue; */
	0x00,       /*  __u8  iConfiguration; */
	0xc0,       /*  __u8  bmAttributes;
				 Bit 7: must be set,
				     6: Self-powered,
				     5: Remote wakeup,
				     4..0: resvd */
	0x00,       /*  __u8  MaxPower; */

	/* USB 1.1:
	 * USB 2.0, single TT organization (mandatory):
	 *	one interface, protocol 0
	 *
	 * USB 2.0, multiple TT organization (optional):
	 *	two interfaces, protocols 1 (like single TT)
	 *	and 2 (multiple TT mode) ... config is
	 *	sometimes settable
	 *	NOT IMPLEMENTED
	 */

	/* one interface */
	0x09,       /*  __u8  if_bLength; */
	USB_DT_INTERFACE, /* __u8 if_bDescriptorType; Interface */
	0x00,       /*  __u8  if_bInterfaceNumber; */
	0x00,       /*  __u8  if_bAlternateSetting; */
	0x01,       /*  __u8  if_bNumEndpoints; */
	0x09,       /*  __u8  if_bInterfaceClass; HUB_CLASSCODE */
	0x00,       /*  __u8  if_bInterfaceSubClass; */
	0x00,       /*  __u8  if_bInterfaceProtocol; [usb1.1 or single tt] */
	0x00,       /*  __u8  if_iInterface; */

	/* one endpoint (status change endpoint) */
	0x07,       /*  __u8  ep_bLength; */
	USB_DT_ENDPOINT, /* __u8 ep_bDescriptorType; Endpoint */
	0x81,       /*  __u8  ep_bEndpointAddress; IN Endpoint 1 */
	0x03,       /*  __u8  ep_bmAttributes; Interrupt */
		    /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
		     * see hub.c:hub_configure() for details. */
	(USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
	0x0c        /*  __u8  ep_bInterval; (256ms -- usb 2.0 spec) */
};

static const u8 ss_rh_config_descriptor[] = {
	/* one configuration */
	0x09,       /*  __u8  bLength; */
	USB_DT_CONFIG, /* __u8 bDescriptorType; Configuration */
	0x1f, 0x00, /*  __le16 wTotalLength; */
	0x01,       /*  __u8  bNumInterfaces; (1) */
	0x01,       /*  __u8  bConfigurationValue; */
	0x00,       /*  __u8  iConfiguration; */
	0xc0,       /*  __u8  bmAttributes;
				 Bit 7: must be set,
				     6: Self-powered,
				     5: Remote wakeup,
				     4..0: resvd */
	0x00,       /*  __u8  MaxPower; */

	/* one interface */
	0x09,       /*  __u8  if_bLength; */
	USB_DT_INTERFACE, /* __u8 if_bDescriptorType; Interface */
	0x00,       /*  __u8  if_bInterfaceNumber; */
	0x00,       /*  __u8  if_bAlternateSetting; */
	0x01,       /*  __u8  if_bNumEndpoints; */
	0x09,       /*  __u8  if_bInterfaceClass; HUB_CLASSCODE */
	0x00,       /*  __u8  if_bInterfaceSubClass; */
	0x00,       /*  __u8  if_bInterfaceProtocol; */
	0x00,       /*  __u8  if_iInterface; */

	/* one endpoint (status change endpoint) */
	0x07,       /*  __u8  ep_bLength; */
	USB_DT_ENDPOINT, /* __u8 ep_bDescriptorType; Endpoint */
	0x81,       /*  __u8  ep_bEndpointAddress; IN Endpoint 1 */
	0x03,       /*  __u8  ep_bmAttributes; Interrupt */
		    /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
		     * see hub.c:hub_configure() for details. */
	(USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
	0x0c,       /*  __u8  ep_bInterval; (256ms -- usb 2.0 spec) */

	/* one SuperSpeed endpoint companion descriptor */
	0x06,        /* __u8 ss_bLength */
	USB_DT_SS_ENDPOINT_COMP, /* __u8 ss_bDescriptorType; SuperSpeed EP */
		     /* Companion */
	0x00,        /* __u8 ss_bMaxBurst; allows 1 TX between ACKs */
	0x00,        /* __u8 ss_bmAttributes; 1 packet per service interval */
	0x02, 0x00   /* __le16 ss_wBytesPerInterval; 15 bits for max 15 ports */
};

/* authorized_default behaviour:
 * -1 is authorized for all devices except wireless (old behaviour)
 * 0 is unauthorized for all devices
 * 1 is authorized for all devices
 * 2 is authorized for internal devices
 */
#define USB_AUTHORIZE_WIRED	-1
#define USB_AUTHORIZE_NONE	0
#define USB_AUTHORIZE_ALL	1
#define USB_AUTHORIZE_INTERNAL	2

static int authorized_default = USB_AUTHORIZE_WIRED;
module_param(authorized_default, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(authorized_default,
		"Default USB device authorization: 0 is not authorized, 1 is "
		"authorized, 2 is authorized for internal devices, -1 is "
		"authorized except for wireless USB (default, old behaviour)");
/*-------------------------------------------------------------------------*/

/**
 * ascii2desc() - Helper routine for producing UTF-16LE string descriptors
 * @s: Null-terminated ASCII (actually ISO-8859-1) string
 * @buf: Buffer for USB string descriptor (header + UTF-16LE)
 * @len: Length (in bytes; may be odd) of descriptor buffer.
 *
 * Return: The number of bytes filled in: 2 + 2*strlen(s) or @len,
 * whichever is less.
 *
 * Note:
 * USB String descriptors can contain at most 126 characters; input
 * strings longer than that are truncated.
 */
static unsigned
ascii2desc(char const *s, u8 *buf, unsigned len)
{
	unsigned n, t = 2 + 2*strlen(s);

	if (t > 254)
		t = 254;	/* Longest possible UTF string descriptor */
	if (len > t)
		len = t;

	t += USB_DT_STRING << 8;	/* Now t is first 16 bits to store */

	n = len;
	while (n--) {
		*buf++ = t;
		if (!n--)
			break;
		*buf++ = t >> 8;
		t = (unsigned char)*s++;
	}
	return len;
}

/**
 * rh_string() - provides string descriptors for root hub
 * @id: the string ID number (0: langids, 1: serial #, 2: product, 3: vendor)
 * @hcd: the host controller for this root hub
 * @data: buffer for output packet
 * @len: length of the provided buffer
 *
 * Produces either a manufacturer, product or serial number string for the
 * virtual root hub device.
 *
 * Return: The number of bytes filled in: the length of the descriptor or
 * of the provided buffer, whichever is less.
 */
static unsigned
rh_string(int id, struct usb_hcd const *hcd, u8 *data, unsigned len)
{
	char buf[100];
	char const *s;
	static char const langids[4] = {4, USB_DT_STRING, 0x09, 0x04};

	/* language ids */
	switch (id) {
	case 0:
		/* Array of LANGID codes (0x0409 is MSFT-speak for "en-us") */
		/* See http://www.usb.org/developers/docs/USB_LANGIDs.pdf */
		if (len > 4)
			len = 4;
		memcpy(data, langids, len);
		return len;
	case 1:
		/* Serial number */
		s = hcd->self.bus_name;
		break;
	case 2:
		/* Product name */
		s = hcd->product_desc;
		break;
	case 3:
		/* Manufacturer */
		snprintf (buf, sizeof buf, "%s %s %s", init_utsname()->sysname,
			init_utsname()->release, hcd->driver->description);
		s = buf;
		break;
	default:
		/* Can't happen; caller guarantees it */
		return 0;
	}

	return ascii2desc(s, data, len);
}


/* Root hub control transfers execute synchronously */
static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
{
	struct usb_ctrlrequest *cmd;
	u16		typeReq, wValue, wIndex, wLength;
	u8		*ubuf = urb->transfer_buffer;
	unsigned	len = 0;
	int		status;
	u8		patch_wakeup = 0;
	u8		patch_protocol = 0;
	u16		tbuf_size;
	u8		*tbuf = NULL;
	const u8	*bufp;

	might_sleep();

	spin_lock_irq(&hcd_root_hub_lock);
	status = usb_hcd_link_urb_to_ep(hcd, urb);
	spin_unlock_irq(&hcd_root_hub_lock);
	if (status)
		return status;
	urb->hcpriv = hcd;	/* Indicate it's queued */

	cmd = (struct usb_ctrlrequest *) urb->setup_packet;
	typeReq  = (cmd->bRequestType << 8) | cmd->bRequest;
	wValue   = le16_to_cpu (cmd->wValue);
	wIndex   = le16_to_cpu (cmd->wIndex);
	wLength  = le16_to_cpu (cmd->wLength);

	if (wLength > urb->transfer_buffer_length)
		goto error;

	/*
	 * tbuf should be at least as big as the
	 * USB hub descriptor.
	 */
	tbuf_size =  max_t(u16, sizeof(struct usb_hub_descriptor), wLength);
	tbuf = kzalloc(tbuf_size, GFP_KERNEL);
	if (!tbuf) {
		status = -ENOMEM;
		goto err_alloc;
	}

	bufp = tbuf;


	urb->actual_length = 0;
	switch (typeReq) {

	/* DEVICE REQUESTS */

	/* The root hub's remote wakeup enable bit is implemented using
	 * driver model wakeup flags.  If this system supports wakeup
	 * through USB, userspace may change the default "allow wakeup"
	 * policy through sysfs or these calls.
	 *
	 * Most root hubs support wakeup from downstream devices, for
	 * runtime power management (disabling USB clocks and reducing
	 * VBUS power usage).  However, not all of them do so; silicon,
	 * board, and BIOS bugs here are not uncommon, so these can't
	 * be treated quite like external hubs.
	 *
	 * Likewise, not all root hubs will pass wakeup events upstream,
	 * to wake up the whole system.  So don't assume root hub and
	 * controller capabilities are identical.
	 */

	case DeviceRequest | USB_REQ_GET_STATUS:
		tbuf[0] = (device_may_wakeup(&hcd->self.root_hub->dev)
					<< USB_DEVICE_REMOTE_WAKEUP)
				| (1 << USB_DEVICE_SELF_POWERED);
		tbuf[1] = 0;
		len = 2;
		break;
	case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
		if (wValue == USB_DEVICE_REMOTE_WAKEUP)
			device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
		else
			goto error;
		break;
	case DeviceOutRequest | USB_REQ_SET_FEATURE:
		if (device_can_wakeup(&hcd->self.root_hub->dev)
				&& wValue == USB_DEVICE_REMOTE_WAKEUP)
			device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
		else
			goto error;
		break;
	case DeviceRequest | USB_REQ_GET_CONFIGURATION:
		tbuf[0] = 1;
		len = 1;
		fallthrough;
	case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
		break;
	case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
		switch (wValue & 0xff00) {
		case USB_DT_DEVICE << 8:
			switch (hcd->speed) {
			case HCD_USB32:
			case HCD_USB31:
				bufp = usb31_rh_dev_descriptor;
				break;
			case HCD_USB3:
				bufp = usb3_rh_dev_descriptor;
				break;
			case HCD_USB25:
				bufp = usb25_rh_dev_descriptor;
				break;
			case HCD_USB2:
				bufp = usb2_rh_dev_descriptor;
				break;
			case HCD_USB11:
				bufp = usb11_rh_dev_descriptor;
				break;
			default:
				goto error;
			}
			len = 18;
			if (hcd->has_tt)
				patch_protocol = 1;
			break;
		case USB_DT_CONFIG << 8:
			switch (hcd->speed) {
			case HCD_USB32:
			case HCD_USB31:
			case HCD_USB3:
				bufp = ss_rh_config_descriptor;
				len = sizeof ss_rh_config_descriptor;
				break;
			case HCD_USB25:
			case HCD_USB2:
				bufp = hs_rh_config_descriptor;
				len = sizeof hs_rh_config_descriptor;
				break;
			case HCD_USB11:
				bufp = fs_rh_config_descriptor;
				len = sizeof fs_rh_config_descriptor;
				break;
			default:
				goto error;
			}
			if (device_can_wakeup(&hcd->self.root_hub->dev))
				patch_wakeup = 1;
			break;
		case USB_DT_STRING << 8:
			if ((wValue & 0xff) < 4)
				urb->actual_length = rh_string(wValue & 0xff,
						hcd, ubuf, wLength);
			else /* unsupported IDs --> "protocol stall" */
				goto error;
			break;
		case USB_DT_BOS << 8:
			goto nongeneric;
		default:
			goto error;
		}
		break;
	case DeviceRequest | USB_REQ_GET_INTERFACE:
		tbuf[0] = 0;
		len = 1;
		fallthrough;
	case DeviceOutRequest | USB_REQ_SET_INTERFACE:
		break;
	case DeviceOutRequest | USB_REQ_SET_ADDRESS:
		/* wValue == urb->dev->devaddr */
		dev_dbg (hcd->self.controller, "root hub device address %d\n",
			wValue);
		break;

	/* INTERFACE REQUESTS (no defined feature/status flags) */

	/* ENDPOINT REQUESTS */

	case EndpointRequest | USB_REQ_GET_STATUS:
		/* ENDPOINT_HALT flag */
		tbuf[0] = 0;
		tbuf[1] = 0;
		len = 2;
		fallthrough;
	case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
	case EndpointOutRequest | USB_REQ_SET_FEATURE:
		dev_dbg (hcd->self.controller, "no endpoint features yet\n");
		break;

	/* CLASS REQUESTS (and errors) */

	default:
nongeneric:
		/* non-generic request */
		switch (typeReq) {
		case GetHubStatus:
			len = 4;
			break;
		case GetPortStatus:
			if (wValue == HUB_PORT_STATUS)
				len = 4;
			else
				/* other port status types return 8 bytes */
				len = 8;
			break;
		case GetHubDescriptor:
			len = sizeof (struct usb_hub_descriptor);
			break;
		case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
			/* len is returned by hub_control */
			break;
		}
		status = hcd->driver->hub_control (hcd,
			typeReq, wValue, wIndex,
			tbuf, wLength);

		if (typeReq == GetHubDescriptor)
			usb_hub_adjust_deviceremovable(hcd->self.root_hub,
				(struct usb_hub_descriptor *)tbuf);
		break;
error:
		/* "protocol stall" on error */
		status = -EPIPE;
	}

	if (status < 0) {
		len = 0;
		if (status != -EPIPE) {
			dev_dbg (hcd->self.controller,
				"CTRL: TypeReq=0x%x val=0x%x "
				"idx=0x%x len=%d ==> %d\n",
				typeReq, wValue, wIndex,
				wLength, status);
		}
	} else if (status > 0) {
		/* hub_control may return the length of data copied. */
		len = status;
		status = 0;
	}
	if (len) {
		if (urb->transfer_buffer_length < len)
			len = urb->transfer_buffer_length;
		urb->actual_length = len;
		/* always USB_DIR_IN, toward host */
		memcpy (ubuf, bufp, len);

		/* report whether RH hardware supports remote wakeup */
		if (patch_wakeup &&
				len > offsetof (struct usb_config_descriptor,
						bmAttributes))
			((struct usb_config_descriptor *)ubuf)->bmAttributes
				|= USB_CONFIG_ATT_WAKEUP;

		/* report whether RH hardware has an integrated TT */
		if (patch_protocol &&
				len > offsetof(struct usb_device_descriptor,
						bDeviceProtocol))
			((struct usb_device_descriptor *) ubuf)->
				bDeviceProtocol = USB_HUB_PR_HS_SINGLE_TT;
	}

	kfree(tbuf);
 err_alloc:

	/* any errors get returned through the urb completion */
	spin_lock_irq(&hcd_root_hub_lock);
	usb_hcd_unlink_urb_from_ep(hcd, urb);
	usb_hcd_giveback_urb(hcd, urb, status);
	spin_unlock_irq(&hcd_root_hub_lock);
	return 0;
}

/*-------------------------------------------------------------------------*/

/*
 * Root Hub interrupt transfers are polled using a timer if the
 * driver requests it; otherwise the driver is responsible for
 * calling usb_hcd_poll_rh_status() when an event occurs.
 *
 * Completion handler may not sleep. See usb_hcd_giveback_urb() for details.
 */
void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
{
	struct urb	*urb;
	int		length;
	int		status;
	unsigned long	flags;
	char		buffer[6];	/* Any root hubs with > 31 ports? */

	if (unlikely(!hcd->rh_pollable))
		return;
	if (!hcd->uses_new_polling && !hcd->status_urb)
		return;

	length = hcd->driver->hub_status_data(hcd, buffer);
	if (length > 0) {

		/* try to complete the status urb */
		spin_lock_irqsave(&hcd_root_hub_lock, flags);
		urb = hcd->status_urb;
		if (urb) {
			clear_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
			hcd->status_urb = NULL;
			if (urb->transfer_buffer_length >= length) {
				status = 0;
			} else {
				status = -EOVERFLOW;
				length = urb->transfer_buffer_length;
			}
			urb->actual_length = length;
			memcpy(urb->transfer_buffer, buffer, length);

			usb_hcd_unlink_urb_from_ep(hcd, urb);
			usb_hcd_giveback_urb(hcd, urb, status);
		} else {
			length = 0;
			set_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
		}
		spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
	}

	/* The USB 2.0 spec says 256 ms.  This is close enough and won't
	 * exceed that limit if HZ is 100. The math is more clunky than
	 * maybe expected, this is to make sure that all timers for USB devices
	 * fire at the same time to give the CPU a break in between */
	if (hcd->uses_new_polling ? HCD_POLL_RH(hcd) :
			(length == 0 && hcd->status_urb != NULL))
		mod_timer (&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
}
EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);

/* timer callback */
static void rh_timer_func (struct timer_list *t)
{
	struct usb_hcd *_hcd = from_timer(_hcd, t, rh_timer);

	usb_hcd_poll_rh_status(_hcd);
}

/*-------------------------------------------------------------------------*/

static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
{
	int		retval;
	unsigned long	flags;
	unsigned	len = 1 + (urb->dev->maxchild / 8);

	spin_lock_irqsave (&hcd_root_hub_lock, flags);
	if (hcd->status_urb || urb->transfer_buffer_length < len) {
		dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
		retval = -EINVAL;
		goto done;
	}

	retval = usb_hcd_link_urb_to_ep(hcd, urb);
	if (retval)
		goto done;

	hcd->status_urb = urb;
	urb->hcpriv = hcd;	/* indicate it's queued */
	if (!hcd->uses_new_polling)
		mod_timer(&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));

	/* If a status change has already occurred, report it ASAP */
	else if (HCD_POLL_PENDING(hcd))
		mod_timer(&hcd->rh_timer, jiffies);
	retval = 0;
 done:
	spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
	return retval;
}

static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
{
	if (usb_endpoint_xfer_int(&urb->ep->desc))
		return rh_queue_status (hcd, urb);
	if (usb_endpoint_xfer_control(&urb->ep->desc))
		return rh_call_control (hcd, urb);
	return -EINVAL;
}

/*-------------------------------------------------------------------------*/

/* Unlinks of root-hub control URBs are legal, but they don't do anything
 * since these URBs always execute synchronously.
 */
static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
{
	unsigned long	flags;
	int		rc;

	spin_lock_irqsave(&hcd_root_hub_lock, flags);
	rc = usb_hcd_check_unlink_urb(hcd, urb, status);
	if (rc)
		goto done;

	if (usb_endpoint_num(&urb->ep->desc) == 0) {	/* Control URB */
		;	/* Do nothing */

	} else {				/* Status URB */
		if (!hcd->uses_new_polling)
			del_timer (&hcd->rh_timer);
		if (urb == hcd->status_urb) {
			hcd->status_urb = NULL;
			usb_hcd_unlink_urb_from_ep(hcd, urb);
			usb_hcd_giveback_urb(hcd, urb, status);
		}
	}
 done:
	spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
	return rc;
}


/*-------------------------------------------------------------------------*/

/**
 * usb_bus_init - shared initialization code
 * @bus: the bus structure being initialized
 *
 * This code is used to initialize a usb_bus structure, memory for which is
 * separately managed.
 */
static void usb_bus_init (struct usb_bus *bus)
{
	memset (&bus->devmap, 0, sizeof(struct usb_devmap));

	bus->devnum_next = 1;

	bus->root_hub = NULL;
	bus->busnum = -1;
	bus->bandwidth_allocated = 0;
	bus->bandwidth_int_reqs  = 0;
	bus->bandwidth_isoc_reqs = 0;
	mutex_init(&bus->devnum_next_mutex);
}

/*-------------------------------------------------------------------------*/

/**
 * usb_register_bus - registers the USB host controller with the usb core
 * @bus: pointer to the bus to register
 *
 * Context: task context, might sleep.
 *
 * Assigns a bus number, and links the controller into usbcore data
 * structures so that it can be seen by scanning the bus list.
 *
 * Return: 0 if successful. A negative error code otherwise.
 */
static int usb_register_bus(struct usb_bus *bus)
{
	int result = -E2BIG;
	int busnum;

	mutex_lock(&usb_bus_idr_lock);
	busnum = idr_alloc(&usb_bus_idr, bus, 1, USB_MAXBUS, GFP_KERNEL);
	if (busnum < 0) {
		pr_err("%s: failed to get bus number\n", usbcore_name);
		goto error_find_busnum;
	}
	bus->busnum = busnum;
	mutex_unlock(&usb_bus_idr_lock);

	usb_notify_add_bus(bus);

	dev_info (bus->controller, "new USB bus registered, assigned bus "
		  "number %d\n", bus->busnum);
	return 0;

error_find_busnum:
	mutex_unlock(&usb_bus_idr_lock);
	return result;
}

/**
 * usb_deregister_bus - deregisters the USB host controller
 * @bus: pointer to the bus to deregister
 *
 * Context: task context, might sleep.
 *
 * Recycles the bus number, and unlinks the controller from usbcore data
 * structures so that it won't be seen by scanning the bus list.
 */
static void usb_deregister_bus (struct usb_bus *bus)
{
	dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);

	/*
	 * NOTE: make sure that all the devices are removed by the
	 * controller code, as well as having it call this when cleaning
	 * itself up
	 */
	mutex_lock(&usb_bus_idr_lock);
	idr_remove(&usb_bus_idr, bus->busnum);
	mutex_unlock(&usb_bus_idr_lock);

	usb_notify_remove_bus(bus);
}

/**
 * register_root_hub - called by usb_add_hcd() to register a root hub
 * @hcd: host controller for this root hub
 *
 * This function registers the root hub with the USB subsystem.  It sets up
 * the device properly in the device tree and then calls usb_new_device()
 * to register the usb device.  It also assigns the root hub's USB address
 * (always 1).
 *
 * Return: 0 if successful. A negative error code otherwise.
 */
static int register_root_hub(struct usb_hcd *hcd)
{
	struct device *parent_dev = hcd->self.controller;
	struct usb_device *usb_dev = hcd->self.root_hub;
	const int devnum = 1;
	int retval;

	usb_dev->devnum = devnum;
	usb_dev->bus->devnum_next = devnum + 1;
	set_bit (devnum, usb_dev->bus->devmap.devicemap);
	usb_set_device_state(usb_dev, USB_STATE_ADDRESS);

	mutex_lock(&usb_bus_idr_lock);

	usb_dev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
	retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
	if (retval != sizeof usb_dev->descriptor) {
		mutex_unlock(&usb_bus_idr_lock);
		dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
				dev_name(&usb_dev->dev), retval);
		return (retval < 0) ? retval : -EMSGSIZE;
	}

	if (le16_to_cpu(usb_dev->descriptor.bcdUSB) >= 0x0201) {
		retval = usb_get_bos_descriptor(usb_dev);
		if (!retval) {
			usb_dev->lpm_capable = usb_device_supports_lpm(usb_dev);
		} else if (usb_dev->speed >= USB_SPEED_SUPER) {
			mutex_unlock(&usb_bus_idr_lock);
			dev_dbg(parent_dev, "can't read %s bos descriptor %d\n",
					dev_name(&usb_dev->dev), retval);
			return retval;
		}
	}

	retval = usb_new_device (usb_dev);
	if (retval) {
		dev_err (parent_dev, "can't register root hub for %s, %d\n",
				dev_name(&usb_dev->dev), retval);
	} else {
		spin_lock_irq (&hcd_root_hub_lock);
		hcd->rh_registered = 1;
		spin_unlock_irq (&hcd_root_hub_lock);

		/* Did the HC die before the root hub was registered? */
		if (HCD_DEAD(hcd))
			usb_hc_died (hcd);	/* This time clean up */
	}
	mutex_unlock(&usb_bus_idr_lock);

	return retval;
}

/*
 * usb_hcd_start_port_resume - a root-hub port is sending a resume signal
 * @bus: the bus which the root hub belongs to
 * @portnum: the port which is being resumed
 *
 * HCDs should call this function when they know that a resume signal is
 * being sent to a root-hub port.  The root hub will be prevented from
 * going into autosuspend until usb_hcd_end_port_resume() is called.
 *
 * The bus's private lock must be held by the caller.
 */
void usb_hcd_start_port_resume(struct usb_bus *bus, int portnum)
{
	unsigned bit = 1 << portnum;

	if (!(bus->resuming_ports & bit)) {
		bus->resuming_ports |= bit;
		pm_runtime_get_noresume(&bus->root_hub->dev);
	}
}
EXPORT_SYMBOL_GPL(usb_hcd_start_port_resume);

/*
 * usb_hcd_end_port_resume - a root-hub port has stopped sending a resume signal
 * @bus: the bus which the root hub belongs to
 * @portnum: the port which is being resumed
 *
 * HCDs should call this function when they know that a resume signal has
 * stopped being sent to a root-hub port.  The root hub will be allowed to
 * autosuspend again.
 *
 * The bus's private lock must be held by the caller.
 */
void usb_hcd_end_port_resume(struct usb_bus *bus, int portnum)
{
	unsigned bit = 1 << portnum;

	if (bus->resuming_ports & bit) {
		bus->resuming_ports &= ~bit;
		pm_runtime_put_noidle(&bus->root_hub->dev);
	}
}
EXPORT_SYMBOL_GPL(usb_hcd_end_port_resume);

/*-------------------------------------------------------------------------*/

/**
 * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
 * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
 * @is_input: true iff the transaction sends data to the host
 * @isoc: true for isochronous transactions, false for interrupt ones
 * @bytecount: how many bytes in the transaction.
 *
 * Return: Approximate bus time in nanoseconds for a periodic transaction.
 *
 * Note:
 * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
 * scheduled in software, this function is only used for such scheduling.
 */
long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
{
	unsigned long	tmp;

	switch (speed) {
	case USB_SPEED_LOW: 	/* INTR only */
		if (is_input) {
			tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
			return 64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp;
		} else {
			tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
			return 64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp;
		}
	case USB_SPEED_FULL:	/* ISOC or INTR */
		if (isoc) {
			tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
			return ((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp;
		} else {
			tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
			return 9107L + BW_HOST_DELAY + tmp;
		}
	case USB_SPEED_HIGH:	/* ISOC or INTR */
		/* FIXME adjust for input vs output */
		if (isoc)
			tmp = HS_NSECS_ISO (bytecount);
		else
			tmp = HS_NSECS (bytecount);
		return tmp;
	default:
		pr_debug ("%s: bogus device speed!\n", usbcore_name);
		return -1;
	}
}
EXPORT_SYMBOL_GPL(usb_calc_bus_time);


/*-------------------------------------------------------------------------*/

/*
 * Generic HC operations.
 */

/*-------------------------------------------------------------------------*/

/**
 * usb_hcd_link_urb_to_ep - add an URB to its endpoint queue
 * @hcd: host controller to which @urb was submitted
 * @urb: URB being submitted
 *
 * Host controller drivers should call this routine in their enqueue()
 * method.  The HCD's private spinlock must be held and interrupts must
 * be disabled.  The actions carried out here are required for URB
 * submission, as well as for endpoint shutdown and for usb_kill_urb.
 *
 * Return: 0 for no error, otherwise a negative error code (in which case
 * the enqueue() method must fail).  If no error occurs but enqueue() fails
 * anyway, it must call usb_hcd_unlink_urb_from_ep() before releasing
 * the private spinlock and returning.
 */
int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb)
{
	int		rc = 0;

	spin_lock(&hcd_urb_list_lock);

	/* Check that the URB isn't being killed */
	if (unlikely(atomic_read(&urb->reject))) {
		rc = -EPERM;
		goto done;
	}

	if (unlikely(!urb->ep->enabled)) {
		rc = -ENOENT;
		goto done;
	}

	if (unlikely(!urb->dev->can_submit)) {
		rc = -EHOSTUNREACH;
		goto done;
	}

	/*
	 * Check the host controller's state and add the URB to the
	 * endpoint's queue.
	 */
	if (HCD_RH_RUNNING(hcd)) {
		urb->unlinked = 0;
		list_add_tail(&urb->urb_list, &urb->ep->urb_list);
	} else {
		rc = -ESHUTDOWN;
		goto done;
	}
 done:
	spin_unlock(&hcd_urb_list_lock);
	return rc;
}
EXPORT_SYMBOL_GPL(usb_hcd_link_urb_to_ep);

/**
 * usb_hcd_check_unlink_urb - check whether an URB may be unlinked
 * @hcd: host controller to which @urb was submitted
 * @urb: URB being checked for unlinkability
 * @status: error code to store in @urb if the unlink succeeds
 *
 * Host controller drivers should call this routine in their dequeue()
 * method.  The HCD's private spinlock must be held and interrupts must
 * be disabled.  The actions carried out here are required for making
 * sure than an unlink is valid.
 *
 * Return: 0 for no error, otherwise a negative error code (in which case
 * the dequeue() method must fail).  The possible error codes are:
 *
 *	-EIDRM: @urb was not submitted or has already completed.
 *		The completion function may not have been called yet.
 *
 *	-EBUSY: @urb has already been unlinked.
 */
int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
		int status)
{
	struct list_head	*tmp;

	/* insist the urb is still queued */
	list_for_each(tmp, &urb->ep->urb_list) {
		if (tmp == &urb->urb_list)
			break;
	}
	if (tmp != &urb->urb_list)
		return -EIDRM;

	/* Any status except -EINPROGRESS means something already started to
	 * unlink this URB from the hardware.  So there's no more work to do.
	 */
	if (urb->unlinked)
		return -EBUSY;
	urb->unlinked = status;
	return 0;
}
EXPORT_SYMBOL_GPL(usb_hcd_check_unlink_urb);

/**
 * usb_hcd_unlink_urb_from_ep - remove an URB from its endpoint queue
 * @hcd: host controller to which @urb was submitted
 * @urb: URB being unlinked
 *
 * Host controller drivers should call this routine before calling
 * usb_hcd_giveback_urb().  The HCD's private spinlock must be held and
 * interrupts must be disabled.  The actions carried out here are required
 * for URB completion.
 */
void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb)
{
	/* clear all state linking urb to this dev (and hcd) */
	spin_lock(&hcd_urb_list_lock);
	list_del_init(&urb->urb_list);
	spin_unlock(&hcd_urb_list_lock);
}
EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep);

/*
 * Some usb host controllers can only perform dma using a small SRAM area.
 * The usb core itself is however optimized for host controllers that can dma
 * using regular system memory - like pci devices doing bus mastering.
 *
 * To support host controllers with limited dma capabilities we provide dma
 * bounce buffers. This feature can be enabled by initializing
 * hcd->localmem_pool using usb_hcd_setup_local_mem().
 *
 * The initialized hcd->localmem_pool then tells the usb code to allocate all
 * data for dma using the genalloc API.
 *
 * So, to summarize...
 *
 * - We need "local" memory, canonical example being
 *   a small SRAM on a discrete controller being the
 *   only memory that the controller can read ...
 *   (a) "normal" kernel memory is no good, and
 *   (b) there's not enough to share
 *
 * - So we use that, even though the primary requirement
 *   is that the memory be "local" (hence addressable
 *   by that device), not "coherent".
 *
 */

static int hcd_alloc_coherent(struct usb_bus *bus,
			      gfp_t mem_flags, dma_addr_t *dma_handle,
			      void **vaddr_handle, size_t size,
			      enum dma_data_direction dir)
{
	unsigned char *vaddr;

	if (*vaddr_handle == NULL) {
		WARN_ON_ONCE(1);
		return -EFAULT;
	}

	vaddr = hcd_buffer_alloc(bus, size + sizeof(unsigned long),
				 mem_flags, dma_handle);
	if (!vaddr)
		return -ENOMEM;

	/*
	 * Store the virtual address of the buffer at the end
	 * of the allocated dma buffer. The size of the buffer
	 * may be uneven so use unaligned functions instead
	 * of just rounding up. It makes sense to optimize for
	 * memory footprint over access speed since the amount
	 * of memory available for dma may be limited.
	 */
	put_unaligned((unsigned long)*vaddr_handle,
		      (unsigned long *)(vaddr + size));

	if (dir == DMA_TO_DEVICE)
		memcpy(vaddr, *vaddr_handle, size);

	*vaddr_handle = vaddr;
	return 0;
}

static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle,
			      void **vaddr_handle, size_t size,
			      enum dma_data_direction dir)
{
	unsigned char *vaddr = *vaddr_handle;

	vaddr = (void *)get_unaligned((unsigned long *)(vaddr + size));

	if (dir == DMA_FROM_DEVICE)
		memcpy(vaddr, *vaddr_handle, size);

	hcd_buffer_free(bus, size + sizeof(vaddr), *vaddr_handle, *dma_handle);

	*vaddr_handle = vaddr;
	*dma_handle = 0;
}

void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *hcd, struct urb *urb)
{
	if (IS_ENABLED(CONFIG_HAS_DMA) &&
	    (urb->transfer_flags & URB_SETUP_MAP_SINGLE))
		dma_unmap_single(hcd->self.sysdev,
				urb->setup_dma,
				sizeof(struct usb_ctrlrequest),
				DMA_TO_DEVICE);
	else if (urb->transfer_flags & URB_SETUP_MAP_LOCAL)
		hcd_free_coherent(urb->dev->bus,
				&urb->setup_dma,
				(void **) &urb->setup_packet,
				sizeof(struct usb_ctrlrequest),
				DMA_TO_DEVICE);

	/* Make it safe to call this routine more than once */
	urb->transfer_flags &= ~(URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL);
}
EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_setup_for_dma);

static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
{
	if (hcd->driver->unmap_urb_for_dma)
		hcd->driver->unmap_urb_for_dma(hcd, urb);
	else
		usb_hcd_unmap_urb_for_dma(hcd, urb);
}

void usb_hcd_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
{
	enum dma_data_direction dir;

	usb_hcd_unmap_urb_setup_for_dma(hcd, urb);

	dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
	if (IS_ENABLED(CONFIG_HAS_DMA) &&
	    (urb->transfer_flags & URB_DMA_MAP_SG))
		dma_unmap_sg(hcd->self.sysdev,
				urb->sg,
				urb->num_sgs,
				dir);
	else if (IS_ENABLED(CONFIG_HAS_DMA) &&
		 (urb->transfer_flags & URB_DMA_MAP_PAGE))
		dma_unmap_page(hcd->self.sysdev,
				urb->transfer_dma,
				urb->transfer_buffer_length,
				dir);
	else if (IS_ENABLED(CONFIG_HAS_DMA) &&
		 (urb->transfer_flags & URB_DMA_MAP_SINGLE))
		dma_unmap_single(hcd->self.sysdev,
				urb->transfer_dma,
				urb->transfer_buffer_length,
				dir);
	else if (urb->transfer_flags & URB_MAP_LOCAL)
		hcd_free_coherent(urb->dev->bus,
				&urb->transfer_dma,
				&urb->transfer_buffer,
				urb->transfer_buffer_length,
				dir);

	/* Make it safe to call this routine more than once */
	urb->transfer_flags &= ~(URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
			URB_DMA_MAP_SINGLE | URB_MAP_LOCAL);
}
EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_for_dma);

static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
			   gfp_t mem_flags)
{
	if (hcd->driver->map_urb_for_dma)
		return hcd->driver->map_urb_for_dma(hcd, urb, mem_flags);
	else
		return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
}

int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
			    gfp_t mem_flags)
{
	enum dma_data_direction dir;
	int ret = 0;

	/* Map the URB's buffers for DMA access.
	 * Lower level HCD code should use *_dma exclusively,
	 * unless it uses pio or talks to another transport,
	 * or uses the provided scatter gather list for bulk.
	 */

	if (usb_endpoint_xfer_control(&urb->ep->desc)) {
		if (hcd->self.uses_pio_for_control)
			return ret;
		if (hcd->localmem_pool) {
			ret = hcd_alloc_coherent(
					urb->dev->bus, mem_flags,
					&urb->setup_dma,
					(void **)&urb->setup_packet,
					sizeof(struct usb_ctrlrequest),
					DMA_TO_DEVICE);
			if (ret)
				return ret;
			urb->transfer_flags |= URB_SETUP_MAP_LOCAL;
		} else if (hcd_uses_dma(hcd)) {
			if (object_is_on_stack(urb->setup_packet)) {
				WARN_ONCE(1, "setup packet is on stack\n");
				return -EAGAIN;
			}

			urb->setup_dma = dma_map_single(
					hcd->self.sysdev,
					urb->setup_packet,
					sizeof(struct usb_ctrlrequest),
					DMA_TO_DEVICE);
			if (dma_mapping_error(hcd->self.sysdev,
						urb->setup_dma))
				return -EAGAIN;
			urb->transfer_flags |= URB_SETUP_MAP_SINGLE;
		}
	}

	dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
	if (urb->transfer_buffer_length != 0
	    && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
		if (hcd->localmem_pool) {
			ret = hcd_alloc_coherent(
					urb->dev->bus, mem_flags,
					&urb->transfer_dma,
					&urb->transfer_buffer,
					urb->transfer_buffer_length,
					dir);
			if (ret == 0)
				urb->transfer_flags |= URB_MAP_LOCAL;
		} else if (hcd_uses_dma(hcd)) {
			if (urb->num_sgs) {
				int n;

				/* We don't support sg for isoc transfers ! */
				if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
					WARN_ON(1);
					return -EINVAL;
				}

				n = dma_map_sg(
						hcd->self.sysdev,
						urb->sg,
						urb->num_sgs,
						dir);
				if (n <= 0)
					ret = -EAGAIN;
				else
					urb->transfer_flags |= URB_DMA_MAP_SG;
				urb->num_mapped_sgs = n;
				if (n != urb->num_sgs)
					urb->transfer_flags |=
							URB_DMA_SG_COMBINED;
			} else if (urb->sg) {
				struct scatterlist *sg = urb->sg;
				urb->transfer_dma = dma_map_page(
						hcd->self.sysdev,
						sg_page(sg),
						sg->offset,
						urb->transfer_buffer_length,
						dir);
				if (dma_mapping_error(hcd->self.sysdev,
						urb->transfer_dma))
					ret = -EAGAIN;
				else
					urb->transfer_flags |= URB_DMA_MAP_PAGE;
			} else if (object_is_on_stack(urb->transfer_buffer)) {
				WARN_ONCE(1, "transfer buffer is on stack\n");
				ret = -EAGAIN;
			} else {
				urb->transfer_dma = dma_map_single(
						hcd->self.sysdev,
						urb->transfer_buffer,
						urb->transfer_buffer_length,
						dir);
				if (dma_mapping_error(hcd->self.sysdev,
						urb->transfer_dma))
					ret = -EAGAIN;
				else
					urb->transfer_flags |= URB_DMA_MAP_SINGLE;
			}
		}
		if (ret && (urb->transfer_flags & (URB_SETUP_MAP_SINGLE |
				URB_SETUP_MAP_LOCAL)))
			usb_hcd_unmap_urb_for_dma(hcd, urb);
	}
	return ret;
}
EXPORT_SYMBOL_GPL(usb_hcd_map_urb_for_dma);

/*-------------------------------------------------------------------------*/

/* may be called in any context with a valid urb->dev usecount
 * caller surrenders "ownership" of urb
 * expects usb_submit_urb() to have sanity checked and conditioned all
 * inputs in the urb
 */
int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
{
	int			status;
	struct usb_hcd		*hcd = bus_to_hcd(urb->dev->bus);

	/* increment urb's reference count as part of giving it to the HCD
	 * (which will control it).  HCD guarantees that it either returns
	 * an error or calls giveback(), but not both.
	 */
	usb_get_urb(urb);
	atomic_inc(&urb->use_count);
	atomic_inc(&urb->dev->urbnum);
	usbmon_urb_submit(&hcd->self, urb);

	/* NOTE requirements on root-hub callers (usbfs and the hub
	 * driver, for now):  URBs' urb->transfer_buffer must be
	 * valid and usb_buffer_{sync,unmap}() not be needed, since
	 * they could clobber root hub response data.  Also, control
	 * URBs must be submitted in process context with interrupts
	 * enabled.
	 */

	if (is_root_hub(urb->dev)) {
		status = rh_urb_enqueue(hcd, urb);
	} else {
		status = map_urb_for_dma(hcd, urb, mem_flags);
		if (likely(status == 0)) {
			status = hcd->driver->urb_enqueue(hcd, urb, mem_flags);
			if (unlikely(status))
				unmap_urb_for_dma(hcd, urb);
		}
	}

	if (unlikely(status)) {
		usbmon_urb_submit_error(&hcd->self, urb, status);
		urb->hcpriv = NULL;
		INIT_LIST_HEAD(&urb->urb_list);
		atomic_dec(&urb->use_count);
		atomic_dec(&urb->dev->urbnum);
		if (atomic_read(&urb->reject))
			wake_up(&usb_kill_urb_queue);
		usb_put_urb(urb);
	}
	return status;
}

/*-------------------------------------------------------------------------*/

/* this makes the hcd giveback() the urb more quickly, by kicking it
 * off hardware queues (which may take a while) and returning it as
 * soon as practical.  we've already set up the urb's return status,
 * but we can't know if the callback completed already.
 */
static int unlink1(struct usb_hcd *hcd, struct urb *urb, int status)
{
	int		value;

	if (is_root_hub(urb->dev))
		value = usb_rh_urb_dequeue(hcd, urb, status);
	else {

		/* The only reason an HCD might fail this call is if
		 * it has not yet fully queued the urb to begin with.
		 * Such failures should be harmless. */
		value = hcd->driver->urb_dequeue(hcd, urb, status);
	}
	return value;
}

/*
 * called in any context
 *
 * caller guarantees urb won't be recycled till both unlink()
 * and the urb's completion function return
 */
int usb_hcd_unlink_urb (struct urb *urb, int status)
{
	struct usb_hcd		*hcd;
	struct usb_device	*udev = urb->dev;
	int			retval = -EIDRM;
	unsigned long		flags;

	/* Prevent the device and bus from going away while
	 * the unlink is carried out.  If they are already gone
	 * then urb->use_count must be 0, since disconnected
	 * devices can't have any active URBs.
	 */
	spin_lock_irqsave(&hcd_urb_unlink_lock, flags);
	if (atomic_read(&urb->use_count) > 0) {
		retval = 0;
		usb_get_dev(udev);
	}
	spin_unlock_irqrestore(&hcd_urb_unlink_lock, flags);
	if (retval == 0) {
		hcd = bus_to_hcd(urb->dev->bus);
		retval = unlink1(hcd, urb, status);
		if (retval == 0)
			retval = -EINPROGRESS;
		else if (retval != -EIDRM && retval != -EBUSY)
			dev_dbg(&udev->dev, "hcd_unlink_urb %pK fail %d\n",
					urb, retval);
		usb_put_dev(udev);
	}
	return retval;
}

/*-------------------------------------------------------------------------*/

static void __usb_hcd_giveback_urb(struct urb *urb)
{
	struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
	struct usb_anchor *anchor = urb->anchor;
	int status = urb->unlinked;

	urb->hcpriv = NULL;
	if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&
	    urb->actual_length < urb->transfer_buffer_length &&
	    !status))
		status = -EREMOTEIO;

	unmap_urb_for_dma(hcd, urb);
	usbmon_urb_complete(&hcd->self, urb, status);
	usb_anchor_suspend_wakeups(anchor);
	usb_unanchor_urb(urb);
	if (likely(status == 0))
		usb_led_activity(USB_LED_EVENT_HOST);

	/* pass ownership to the completion handler */
	urb->status = status;
	/*
	 * This function can be called in task context inside another remote
	 * coverage collection section, but kcov doesn't support that kind of
	 * recursion yet. Only collect coverage in softirq context for now.
	 */
	kcov_remote_start_usb_softirq((u64)urb->dev->bus->busnum);
	urb->complete(urb);
	kcov_remote_stop_softirq();

	usb_anchor_resume_wakeups(anchor);
	atomic_dec(&urb->use_count);
	if (unlikely(atomic_read(&urb->reject)))
		wake_up(&usb_kill_urb_queue);
	usb_put_urb(urb);
}

static void usb_giveback_urb_bh(struct tasklet_struct *t)
{
	struct giveback_urb_bh *bh = from_tasklet(bh, t, bh);
	struct list_head local_list;

	spin_lock_irq(&bh->lock);
	bh->running = true;
 restart:
	list_replace_init(&bh->head, &local_list);
	spin_unlock_irq(&bh->lock);

	while (!list_empty(&local_list)) {
		struct urb *urb;

		urb = list_entry(local_list.next, struct urb, urb_list);
		list_del_init(&urb->urb_list);
		bh->completing_ep = urb->ep;
		__usb_hcd_giveback_urb(urb);
		bh->completing_ep = NULL;
	}

	/* check if there are new URBs to giveback */
	spin_lock_irq(&bh->lock);
	if (!list_empty(&bh->head))
		goto restart;
	bh->running = false;
	spin_unlock_irq(&bh->lock);
}

/**
 * usb_hcd_giveback_urb - return URB from HCD to device driver
 * @hcd: host controller returning the URB
 * @urb: urb being returned to the USB device driver.
 * @status: completion status code for the URB.
 *
 * Context: atomic. The completion callback is invoked in caller's context.
 * For HCDs with HCD_BH flag set, the completion callback is invoked in tasklet
 * context (except for URBs submitted to the root hub which always complete in
 * caller's context).
 *
 * This hands the URB from HCD to its USB device driver, using its
 * completion function.  The HCD has freed all per-urb resources
 * (and is done using urb->hcpriv).  It also released all HCD locks;
 * the device driver won't cause problems if it frees, modifies,
 * or resubmits this URB.
 *
 * If @urb was unlinked, the value of @status will be overridden by
 * @urb->unlinked.  Erroneous short transfers are detected in case
 * the HCD hasn't checked for them.
 */
void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status)
{
	struct giveback_urb_bh *bh;
	bool running, high_prio_bh;

	/* pass status to tasklet via unlinked */
	if (likely(!urb->unlinked))
		urb->unlinked = status;

	if (!hcd_giveback_urb_in_bh(hcd) && !is_root_hub(urb->dev)) {
		__usb_hcd_giveback_urb(urb);
		return;
	}

	if (usb_pipeisoc(urb->pipe) || usb_pipeint(urb->pipe)) {
		bh = &hcd->high_prio_bh;
		high_prio_bh = true;
	} else {
		bh = &hcd->low_prio_bh;
		high_prio_bh = false;
	}

	spin_lock(&bh->lock);
	list_add_tail(&urb->urb_list, &bh->head);
	running = bh->running;
	spin_unlock(&bh->lock);

	if (running)
		;
	else if (high_prio_bh)
		tasklet_hi_schedule(&bh->bh);
	else
		tasklet_schedule(&bh->bh);
}
EXPORT_SYMBOL_GPL(usb_hcd_giveback_urb);

/*-------------------------------------------------------------------------*/

/* Cancel all URBs pending on this endpoint and wait for the endpoint's
 * queue to drain completely.  The caller must first insure that no more
 * URBs can be submitted for this endpoint.
 */
void usb_hcd_flush_endpoint(struct usb_device *udev,
		struct usb_host_endpoint *ep)
{
	struct usb_hcd		*hcd;
	struct urb		*urb;

	if (!ep)
		return;
	might_sleep();
	hcd = bus_to_hcd(udev->bus);

	/* No more submits can occur */
	spin_lock_irq(&hcd_urb_list_lock);
rescan:
	list_for_each_entry_reverse(urb, &ep->urb_list, urb_list) {
		int	is_in;

		if (urb->unlinked)
			continue;
		usb_get_urb (urb);
		is_in = usb_urb_dir_in(urb);
		spin_unlock(&hcd_urb_list_lock);

		/* kick hcd */
		unlink1(hcd, urb, -ESHUTDOWN);
		dev_dbg (hcd->self.controller,
			"shutdown urb %pK ep%d%s-%s\n",
			urb, usb_endpoint_num(&ep->desc),
			is_in ? "in" : "out",
			usb_ep_type_string(usb_endpoint_type(&ep->desc)));
		usb_put_urb (urb);

		/* list contents may have changed */
		spin_lock(&hcd_urb_list_lock);
		goto rescan;
	}
	spin_unlock_irq(&hcd_urb_list_lock);

	/* Wait until the endpoint queue is completely empty */
	while (!list_empty (&ep->urb_list)) {
		spin_lock_irq(&hcd_urb_list_lock);

		/* The list may have changed while we acquired the spinlock */
		urb = NULL;
		if (!list_empty (&ep->urb_list)) {
			urb = list_entry (ep->urb_list.prev, struct urb,
					urb_list);
			usb_get_urb (urb);
		}
		spin_unlock_irq(&hcd_urb_list_lock);

		if (urb) {
			usb_kill_urb (urb);
			usb_put_urb (urb);
		}
	}
}

/**
 * usb_hcd_alloc_bandwidth - check whether a new bandwidth setting exceeds
 *				the bus bandwidth
 * @udev: target &usb_device
 * @new_config: new configuration to install
 * @cur_alt: the current alternate interface setting
 * @new_alt: alternate interface setting that is being installed
 *
 * To change configurations, pass in the new configuration in new_config,
 * and pass NULL for cur_alt and new_alt.
 *
 * To reset a device's configuration (put the device in the ADDRESSED state),
 * pass in NULL for new_config, cur_alt, and new_alt.
 *
 * To change alternate interface settings, pass in NULL for new_config,
 * pass in the current alternate interface setting in cur_alt,
 * and pass in the new alternate interface setting in new_alt.
 *
 * Return: An error if the requested bandwidth change exceeds the
 * bus bandwidth or host controller internal resources.
 */
int usb_hcd_alloc_bandwidth(struct usb_device *udev,
		struct usb_host_config *new_config,
		struct usb_host_interface *cur_alt,
		struct usb_host_interface *new_alt)
{
	int num_intfs, i, j;
	struct usb_host_interface *alt = NULL;
	int ret = 0;
	struct usb_hcd *hcd;
	struct usb_host_endpoint *ep;

	hcd = bus_to_hcd(udev->bus);
	if (!hcd->driver->check_bandwidth)
		return 0;

	/* Configuration is being removed - set configuration 0 */
	if (!new_config && !cur_alt) {
		for (i = 1; i < 16; ++i) {
			ep = udev->ep_out[i];
			if (ep)
				hcd->driver->drop_endpoint(hcd, udev, ep);
			ep = udev->ep_in[i];
			if (ep)
				hcd->driver->drop_endpoint(hcd, udev, ep);
		}
		hcd->driver->check_bandwidth(hcd, udev);
		return 0;
	}
	/* Check if the HCD says there's enough bandwidth.  Enable all endpoints
	 * each interface's alt setting 0 and ask the HCD to check the bandwidth
	 * of the bus.  There will always be bandwidth for endpoint 0, so it's
	 * ok to exclude it.
	 */
	if (new_config) {
		num_intfs = new_config->desc.bNumInterfaces;
		/* Remove endpoints (except endpoint 0, which is always on the
		 * schedule) from the old config from the schedule
		 */
		for (i = 1; i < 16; ++i) {
			ep = udev->ep_out[i];
			if (ep) {
				ret = hcd->driver->drop_endpoint(hcd, udev, ep);
				if (ret < 0)
					goto reset;
			}
			ep = udev->ep_in[i];
			if (ep) {
				ret = hcd->driver->drop_endpoint(hcd, udev, ep);
				if (ret < 0)
					goto reset;
			}
		}
		for (i = 0; i < num_intfs; ++i) {
			struct usb_host_interface *first_alt;
			int iface_num;

			first_alt = &new_config->intf_cache[i]->altsetting[0];
			iface_num = first_alt->desc.bInterfaceNumber;
			/* Set up endpoints for alternate interface setting 0 */
			alt = usb_find_alt_setting(new_config, iface_num, 0);
			if (!alt)
				/* No alt setting 0? Pick the first setting. */
				alt = first_alt;

			for (j = 0; j < alt->desc.bNumEndpoints; j++) {
				ret = hcd->driver->add_endpoint(hcd, udev, &alt->endpoint[j]);
				if (ret < 0)
					goto reset;
			}
		}
	}
	if (cur_alt && new_alt) {
		struct usb_interface *iface = usb_ifnum_to_if(udev,
				cur_alt->desc.bInterfaceNumber);

		if (!iface)
			return -EINVAL;
		if (iface->resetting_device) {
			/*
			 * The USB core just reset the device, so the xHCI host
			 * and the device will think alt setting 0 is installed.
			 * However, the USB core will pass in the alternate
			 * setting installed before the reset as cur_alt.  Dig
			 * out the alternate setting 0 structure, or the first
			 * alternate setting if a broken device doesn't have alt
			 * setting 0.
			 */
			cur_alt = usb_altnum_to_altsetting(iface, 0);
			if (!cur_alt)
				cur_alt = &iface->altsetting[0];
		}

		/* Drop all the endpoints in the current alt setting */
		for (i = 0; i < cur_alt->desc.bNumEndpoints; i++) {
			ret = hcd->driver->drop_endpoint(hcd, udev,
					&cur_alt->endpoint[i]);
			if (ret < 0)
				goto reset;
		}
		/* Add all the endpoints in the new alt setting */
		for (i = 0; i < new_alt->desc.bNumEndpoints; i++) {
			ret = hcd->driver->add_endpoint(hcd, udev,
					&new_alt->endpoint[i]);
			if (ret < 0)
				goto reset;
		}
	}
	ret = hcd->driver->check_bandwidth(hcd, udev);
reset:
	if (ret < 0)
		hcd->driver->reset_bandwidth(hcd, udev);
	return ret;
}

/* Disables the endpoint: synchronizes with the hcd to make sure all
 * endpoint state is gone from hardware.  usb_hcd_flush_endpoint() must
 * have been called previously.  Use for set_configuration, set_interface,
 * driver removal, physical disconnect.
 *
 * example:  a qh stored in ep->hcpriv, holding state related to endpoint
 * type, maxpacket size, toggle, halt status, and scheduling.
 */
void usb_hcd_disable_endpoint(struct usb_device *udev,
		struct usb_host_endpoint *ep)
{
	struct usb_hcd		*hcd;

	might_sleep();
	hcd = bus_to_hcd(udev->bus);
	if (hcd->driver->endpoint_disable)
		hcd->driver->endpoint_disable(hcd, ep);
}

/**
 * usb_hcd_reset_endpoint - reset host endpoint state
 * @udev: USB device.
 * @ep:   the endpoint to reset.
 *
 * Resets any host endpoint state such as the toggle bit, sequence
 * number and current window.
 */
void usb_hcd_reset_endpoint(struct usb_device *udev,
			    struct usb_host_endpoint *ep)
{
	struct usb_hcd *hcd = bus_to_hcd(udev->bus);

	if (hcd->driver->endpoint_reset)
		hcd->driver->endpoint_reset(hcd, ep);
	else {
		int epnum = usb_endpoint_num(&ep->desc);
		int is_out = usb_endpoint_dir_out(&ep->desc);
		int is_control = usb_endpoint_xfer_control(&ep->desc);

		usb_settoggle(udev, epnum, is_out, 0);
		if (is_control)
			usb_settoggle(udev, epnum, !is_out, 0);
	}
}

/**
 * usb_alloc_streams - allocate bulk endpoint stream IDs.
 * @interface:		alternate setting that includes all endpoints.
 * @eps:		array of endpoints that need streams.
 * @num_eps:		number of endpoints in the array.
 * @num_streams:	number of streams to allocate.
 * @mem_flags:		flags hcd should use to allocate memory.
 *
 * Sets up a group of bulk endpoints to have @num_streams stream IDs available.
 * Drivers may queue multiple transfers to different stream IDs, which may
 * complete in a different order than they were queued.
 *
 * Return: On success, the number of allocated streams. On failure, a negative
 * error code.
 */
int usb_alloc_streams(struct usb_interface *interface,
		struct usb_host_endpoint **eps, unsigned int num_eps,
		unsigned int num_streams, gfp_t mem_flags)
{
	struct usb_hcd *hcd;
	struct usb_device *dev;
	int i, ret;

	dev = interface_to_usbdev(interface);
	hcd = bus_to_hcd(dev->bus);
	if (!hcd->driver->alloc_streams || !hcd->driver->free_streams)
		return -EINVAL;
	if (dev->speed < USB_SPEED_SUPER)
		return -EINVAL;
	if (dev->state < USB_STATE_CONFIGURED)
		return -ENODEV;

	for (i = 0; i < num_eps; i++) {
		/* Streams only apply to bulk endpoints. */
		if (!usb_endpoint_xfer_bulk(&eps[i]->desc))
			return -EINVAL;
		/* Re-alloc is not allowed */
		if (eps[i]->streams)
			return -EINVAL;
	}

	ret = hcd->driver->alloc_streams(hcd, dev, eps, num_eps,
			num_streams, mem_flags);
	if (ret < 0)
		return ret;

	for (i = 0; i < num_eps; i++)
		eps[i]->streams = ret;

	return ret;
}
EXPORT_SYMBOL_GPL(usb_alloc_streams);

/**
 * usb_free_streams - free bulk endpoint stream IDs.
 * @interface:	alternate setting that includes all endpoints.
 * @eps:	array of endpoints to remove streams from.
 * @num_eps:	number of endpoints in the array.
 * @mem_flags:	flags hcd should use to allocate memory.
 *
 * Reverts a group of bulk endpoints back to not using stream IDs.
 * Can fail if we are given bad arguments, or HCD is broken.
 *
 * Return: 0 on success. On failure, a negative error code.
 */
int usb_free_streams(struct usb_interface *interface,
		struct usb_host_endpoint **eps, unsigned int num_eps,
		gfp_t mem_flags)
{
	struct usb_hcd *hcd;
	struct usb_device *dev;
	int i, ret;

	dev = interface_to_usbdev(interface);
	hcd = bus_to_hcd(dev->bus);
	if (dev->speed < USB_SPEED_SUPER)
		return -EINVAL;

	/* Double-free is not allowed */
	for (i = 0; i < num_eps; i++)
		if (!eps[i] || !eps[i]->streams)
			return -EINVAL;

	ret = hcd->driver->free_streams(hcd, dev, eps, num_eps, mem_flags);
	if (ret < 0)
		return ret;

	for (i = 0; i < num_eps; i++)
		eps[i]->streams = 0;

	return ret;
}
EXPORT_SYMBOL_GPL(usb_free_streams);

/* Protect against drivers that try to unlink URBs after the device
 * is gone, by waiting until all unlinks for @udev are finished.
 * Since we don't currently track URBs by device, simply wait until
 * nothing is running in the locked region of usb_hcd_unlink_urb().
 */
void usb_hcd_synchronize_unlinks(struct usb_device *udev)
{
	spin_lock_irq(&hcd_urb_unlink_lock);
	spin_unlock_irq(&hcd_urb_unlink_lock);
}

/*-------------------------------------------------------------------------*/

/* called in any context */
int usb_hcd_get_frame_number (struct usb_device *udev)
{
	struct usb_hcd	*hcd = bus_to_hcd(udev->bus);

	if (!HCD_RH_RUNNING(hcd))
		return -ESHUTDOWN;
	return hcd->driver->get_frame_number (hcd);
}

/*-------------------------------------------------------------------------*/
#ifdef CONFIG_USB_HCD_TEST_MODE

static void usb_ehset_completion(struct urb *urb)
{
	struct completion  *done = urb->context;

	complete(done);
}
/*
 * Allocate and initialize a control URB. This request will be used by the
 * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
 * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
 * Return NULL if failed.
 */
static struct urb *request_single_step_set_feature_urb(
	struct usb_device	*udev,
	void			*dr,
	void			*buf,
	struct completion	*done)
{
	struct urb *urb;
	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
	struct usb_host_endpoint *ep;

	urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!urb)
		return NULL;

	urb->pipe = usb_rcvctrlpipe(udev, 0);
	ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
				[usb_pipeendpoint(urb->pipe)];
	if (!ep) {
		usb_free_urb(urb);
		return NULL;
	}

	urb->ep = ep;
	urb->dev = udev;
	urb->setup_packet = (void *)dr;
	urb->transfer_buffer = buf;
	urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
	urb->complete = usb_ehset_completion;
	urb->status = -EINPROGRESS;
	urb->actual_length = 0;
	urb->transfer_flags = URB_DIR_IN;
	usb_get_urb(urb);
	atomic_inc(&urb->use_count);
	atomic_inc(&urb->dev->urbnum);
	if (map_urb_for_dma(hcd, urb, GFP_KERNEL)) {
		usb_put_urb(urb);
		usb_free_urb(urb);
		return NULL;
	}

	urb->context = done;
	return urb;
}

int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
{
	int retval = -ENOMEM;
	struct usb_ctrlrequest *dr;
	struct urb *urb;
	struct usb_device *udev;
	struct usb_device_descriptor *buf;
	DECLARE_COMPLETION_ONSTACK(done);

	/* Obtain udev of the rhub's child port */
	udev = usb_hub_find_child(hcd->self.root_hub, port);
	if (!udev) {
		dev_err(hcd->self.controller, "No device attached to the RootHub\n");
		return -ENODEV;
	}
	buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
	if (!dr) {
		kfree(buf);
		return -ENOMEM;
	}

	/* Fill Setup packet for GetDescriptor */
	dr->bRequestType = USB_DIR_IN;
	dr->bRequest = USB_REQ_GET_DESCRIPTOR;
	dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
	dr->wIndex = 0;
	dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
	urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
	if (!urb)
		goto cleanup;

	/* Submit just the SETUP stage */
	retval = hcd->driver->submit_single_step_set_feature(hcd, urb, 1);
	if (retval)
		goto out1;
	if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
		usb_kill_urb(urb);
		retval = -ETIMEDOUT;
		dev_err(hcd->self.controller,
			"%s SETUP stage timed out on ep0\n", __func__);
		goto out1;
	}
	msleep(15 * 1000);

	/* Complete remaining DATA and STATUS stages using the same URB */
	urb->status = -EINPROGRESS;
	usb_get_urb(urb);
	atomic_inc(&urb->use_count);
	atomic_inc(&urb->dev->urbnum);
	retval = hcd->driver->submit_single_step_set_feature(hcd, urb, 0);
	if (!retval && !wait_for_completion_timeout(&done,
						msecs_to_jiffies(2000))) {
		usb_kill_urb(urb);
		retval = -ETIMEDOUT;
		dev_err(hcd->self.controller,
			"%s IN stage timed out on ep0\n", __func__);
	}
out1:
	usb_free_urb(urb);
cleanup:
	kfree(dr);
	kfree(buf);
	return retval;
}
EXPORT_SYMBOL_GPL(ehset_single_step_set_feature);
#endif /* CONFIG_USB_HCD_TEST_MODE */

/*-------------------------------------------------------------------------*/

#ifdef	CONFIG_PM

int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
{
	struct usb_hcd	*hcd = bus_to_hcd(rhdev->bus);
	int		status;
	int		old_state = hcd->state;

	dev_dbg(&rhdev->dev, "bus %ssuspend, wakeup %d\n",
			(PMSG_IS_AUTO(msg) ? "auto-" : ""),
			rhdev->do_remote_wakeup);
	if (HCD_DEAD(hcd)) {
		dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "suspend");
		return 0;
	}

	if (!hcd->driver->bus_suspend) {
		status = -ENOENT;
	} else {
		clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
		hcd->state = HC_STATE_QUIESCING;
		status = hcd->driver->bus_suspend(hcd);
	}
	if (status == 0) {
		usb_set_device_state(rhdev, USB_STATE_SUSPENDED);
		hcd->state = HC_STATE_SUSPENDED;

		if (!PMSG_IS_AUTO(msg))
			usb_phy_roothub_suspend(hcd->self.sysdev,
						hcd->phy_roothub);

		/* Did we race with a root-hub wakeup event? */
		if (rhdev->do_remote_wakeup) {
			char	buffer[6];

			status = hcd->driver->hub_status_data(hcd, buffer);
			if (status != 0) {
				dev_dbg(&rhdev->dev, "suspend raced with wakeup event\n");
				hcd_bus_resume(rhdev, PMSG_AUTO_RESUME);
				status = -EBUSY;
			}
		}
	} else {
		spin_lock_irq(&hcd_root_hub_lock);
		if (!HCD_DEAD(hcd)) {
			set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
			hcd->state = old_state;
		}
		spin_unlock_irq(&hcd_root_hub_lock);
		dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
				"suspend", status);
	}
	return status;
}

int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
{
	struct usb_hcd	*hcd = bus_to_hcd(rhdev->bus);
	int		status;
	int		old_state = hcd->state;

	dev_dbg(&rhdev->dev, "usb %sresume\n",
			(PMSG_IS_AUTO(msg) ? "auto-" : ""));
	if (HCD_DEAD(hcd)) {
		dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "resume");
		return 0;
	}

	if (!PMSG_IS_AUTO(msg)) {
		status = usb_phy_roothub_resume(hcd->self.sysdev,
						hcd->phy_roothub);
		if (status)
			return status;
	}

	if (!hcd->driver->bus_resume)
		return -ENOENT;
	if (HCD_RH_RUNNING(hcd))
		return 0;

	hcd->state = HC_STATE_RESUMING;
	status = hcd->driver->bus_resume(hcd);
	clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
	if (status == 0)
		status = usb_phy_roothub_calibrate(hcd->phy_roothub);

	if (status == 0) {
		struct usb_device *udev;
		int port1;

		spin_lock_irq(&hcd_root_hub_lock);
		if (!HCD_DEAD(hcd)) {
			usb_set_device_state(rhdev, rhdev->actconfig
					? USB_STATE_CONFIGURED
					: USB_STATE_ADDRESS);
			set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
			hcd->state = HC_STATE_RUNNING;
		}
		spin_unlock_irq(&hcd_root_hub_lock);

		/*
		 * Check whether any of the enabled ports on the root hub are
		 * unsuspended.  If they are then a TRSMRCY delay is needed
		 * (this is what the USB-2 spec calls a "global resume").
		 * Otherwise we can skip the delay.
		 */
		usb_hub_for_each_child(rhdev, port1, udev) {
			if (udev->state != USB_STATE_NOTATTACHED &&
					!udev->port_is_suspended) {
				usleep_range(10000, 11000);	/* TRSMRCY */
				break;
			}
		}
	} else {
		hcd->state = old_state;
		usb_phy_roothub_suspend(hcd->self.sysdev, hcd->phy_roothub);
		dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
				"resume", status);
		if (status != -ESHUTDOWN)
			usb_hc_died(hcd);
	}
	return status;
}

/* Workqueue routine for root-hub remote wakeup */
static void hcd_resume_work(struct work_struct *work)
{
	struct usb_hcd *hcd = container_of(work, struct usb_hcd, wakeup_work);
	struct usb_device *udev = hcd->self.root_hub;

	usb_remote_wakeup(udev);
}

/**
 * usb_hcd_resume_root_hub - called by HCD to resume its root hub
 * @hcd: host controller for this root hub
 *
 * The USB host controller calls this function when its root hub is
 * suspended (with the remote wakeup feature enabled) and a remote
 * wakeup request is received.  The routine submits a workqueue request
 * to resume the root hub (that is, manage its downstream ports again).
 */
void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
{
	unsigned long flags;

	spin_lock_irqsave (&hcd_root_hub_lock, flags);
	if (hcd->rh_registered) {
		pm_wakeup_event(&hcd->self.root_hub->dev, 0);
		set_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
		queue_work(pm_wq, &hcd->wakeup_work);
	}
	spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
}
EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);

#endif	/* CONFIG_PM */

/*-------------------------------------------------------------------------*/

#ifdef	CONFIG_USB_OTG

/**
 * usb_bus_start_enum - start immediate enumeration (for OTG)
 * @bus: the bus (must use hcd framework)
 * @port_num: 1-based number of port; usually bus->otg_port
 * Context: atomic
 *
 * Starts enumeration, with an immediate reset followed later by
 * hub_wq identifying and possibly configuring the device.
 * This is needed by OTG controller drivers, where it helps meet
 * HNP protocol timing requirements for starting a port reset.
 *
 * Return: 0 if successful.
 */
int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
{
	struct usb_hcd		*hcd;
	int			status = -EOPNOTSUPP;

	/* NOTE: since HNP can't start by grabbing the bus's address0_sem,
	 * boards with root hubs hooked up to internal devices (instead of
	 * just the OTG port) may need more attention to resetting...
	 */
	hcd = bus_to_hcd(bus);
	if (port_num && hcd->driver->start_port_reset)
		status = hcd->driver->start_port_reset(hcd, port_num);

	/* allocate hub_wq shortly after (first) root port reset finishes;
	 * it may issue others, until at least 50 msecs have passed.
	 */
	if (status == 0)
		mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
	return status;
}
EXPORT_SYMBOL_GPL(usb_bus_start_enum);

#endif

/*-------------------------------------------------------------------------*/

/**
 * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
 * @irq: the IRQ being raised
 * @__hcd: pointer to the HCD whose IRQ is being signaled
 *
 * If the controller isn't HALTed, calls the driver's irq handler.
 * Checks whether the controller is now dead.
 *
 * Return: %IRQ_HANDLED if the IRQ was handled. %IRQ_NONE otherwise.
 */
irqreturn_t usb_hcd_irq (int irq, void *__hcd)
{
	struct usb_hcd		*hcd = __hcd;
	irqreturn_t		rc;

	if (unlikely(HCD_DEAD(hcd) || !HCD_HW_ACCESSIBLE(hcd)))
		rc = IRQ_NONE;
	else if (hcd->driver->irq(hcd) == IRQ_NONE)
		rc = IRQ_NONE;
	else
		rc = IRQ_HANDLED;

	return rc;
}
EXPORT_SYMBOL_GPL(usb_hcd_irq);

/*-------------------------------------------------------------------------*/

/* Workqueue routine for when the root-hub has died. */
static void hcd_died_work(struct work_struct *work)
{
	struct usb_hcd *hcd = container_of(work, struct usb_hcd, died_work);
	static char *env[] = {
		"ERROR=DEAD",
		NULL
	};

	/* Notify user space that the host controller has died */
	kobject_uevent_env(&hcd->self.root_hub->dev.kobj, KOBJ_OFFLINE, env);
}

/**
 * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
 * @hcd: pointer to the HCD representing the controller
 *
 * This is called by bus glue to report a USB host controller that died
 * while operations may still have been pending.  It's called automatically
 * by the PCI glue, so only glue for non-PCI busses should need to call it.
 *
 * Only call this function with the primary HCD.
 */
void usb_hc_died (struct usb_hcd *hcd)
{
	unsigned long flags;

	dev_err (hcd->self.controller, "HC died; cleaning up\n");

	spin_lock_irqsave (&hcd_root_hub_lock, flags);
	clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
	set_bit(HCD_FLAG_DEAD, &hcd->flags);
	if (hcd->rh_registered) {
		clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);

		/* make hub_wq clean up old urbs and devices */
		usb_set_device_state (hcd->self.root_hub,
				USB_STATE_NOTATTACHED);
		usb_kick_hub_wq(hcd->self.root_hub);
	}
	if (usb_hcd_is_primary_hcd(hcd) && hcd->shared_hcd) {
		hcd = hcd->shared_hcd;
		clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
		set_bit(HCD_FLAG_DEAD, &hcd->flags);
		if (hcd->rh_registered) {
			clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);

			/* make hub_wq clean up old urbs and devices */
			usb_set_device_state(hcd->self.root_hub,
					USB_STATE_NOTATTACHED);
			usb_kick_hub_wq(hcd->self.root_hub);
		}
	}

	/* Handle the case where this function gets called with a shared HCD */
	if (usb_hcd_is_primary_hcd(hcd))
		schedule_work(&hcd->died_work);
	else
		schedule_work(&hcd->primary_hcd->died_work);

	spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
	/* Make sure that the other roothub is also deallocated. */
}
EXPORT_SYMBOL_GPL (usb_hc_died);

/*-------------------------------------------------------------------------*/

static void init_giveback_urb_bh(struct giveback_urb_bh *bh)
{

	spin_lock_init(&bh->lock);
	INIT_LIST_HEAD(&bh->head);
	tasklet_setup(&bh->bh, usb_giveback_urb_bh);
}

struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,
		struct device *sysdev, struct device *dev, const char *bus_name,
		struct usb_hcd *primary_hcd)
{
	struct usb_hcd *hcd;

	hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
	if (!hcd)
		return NULL;
	if (primary_hcd == NULL) {
		hcd->address0_mutex = kmalloc(sizeof(*hcd->address0_mutex),
				GFP_KERNEL);
		if (!hcd->address0_mutex) {
			kfree(hcd);
			dev_dbg(dev, "hcd address0 mutex alloc failed\n");
			return NULL;
		}
		mutex_init(hcd->address0_mutex);
		hcd->bandwidth_mutex = kmalloc(sizeof(*hcd->bandwidth_mutex),
				GFP_KERNEL);
		if (!hcd->bandwidth_mutex) {
			kfree(hcd->address0_mutex);
			kfree(hcd);
			dev_dbg(dev, "hcd bandwidth mutex alloc failed\n");
			return NULL;
		}
		mutex_init(hcd->bandwidth_mutex);
		dev_set_drvdata(dev, hcd);
	} else {
		mutex_lock(&usb_port_peer_mutex);
		hcd->address0_mutex = primary_hcd->address0_mutex;
		hcd->bandwidth_mutex = primary_hcd->bandwidth_mutex;
		hcd->primary_hcd = primary_hcd;
		primary_hcd->primary_hcd = primary_hcd;
		hcd->shared_hcd = primary_hcd;
		primary_hcd->shared_hcd = hcd;
		mutex_unlock(&usb_port_peer_mutex);
	}

	kref_init(&hcd->kref);

	usb_bus_init(&hcd->self);
	hcd->self.controller = dev;
	hcd->self.sysdev = sysdev;
	hcd->self.bus_name = bus_name;

	timer_setup(&hcd->rh_timer, rh_timer_func, 0);
#ifdef CONFIG_PM
	INIT_WORK(&hcd->wakeup_work, hcd_resume_work);
#endif

	INIT_WORK(&hcd->died_work, hcd_died_work);

	hcd->driver = driver;
	hcd->speed = driver->flags & HCD_MASK;
	hcd->product_desc = (driver->product_desc) ? driver->product_desc :
			"USB Host Controller";
	return hcd;
}
EXPORT_SYMBOL_GPL(__usb_create_hcd);

/**
 * usb_create_shared_hcd - create and initialize an HCD structure
 * @driver: HC driver that will use this hcd
 * @dev: device for this HC, stored in hcd->self.controller
 * @bus_name: value to store in hcd->self.bus_name
 * @primary_hcd: a pointer to the usb_hcd structure that is sharing the
 *              PCI device.  Only allocate certain resources for the primary HCD
 *
 * Context: task context, might sleep.
 *
 * Allocate a struct usb_hcd, with extra space at the end for the
 * HC driver's private data.  Initialize the generic members of the
 * hcd structure.
 *
 * Return: On success, a pointer to the created and initialized HCD structure.
 * On failure (e.g. if memory is unavailable), %NULL.
 */
struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
		struct device *dev, const char *bus_name,
		struct usb_hcd *primary_hcd)
{
	return __usb_create_hcd(driver, dev, dev, bus_name, primary_hcd);
}
EXPORT_SYMBOL_GPL(usb_create_shared_hcd);

/**
 * usb_create_hcd - create and initialize an HCD structure
 * @driver: HC driver that will use this hcd
 * @dev: device for this HC, stored in hcd->self.controller
 * @bus_name: value to store in hcd->self.bus_name
 *
 * Context: task context, might sleep.
 *
 * Allocate a struct usb_hcd, with extra space at the end for the
 * HC driver's private data.  Initialize the generic members of the
 * hcd structure.
 *
 * Return: On success, a pointer to the created and initialized HCD
 * structure. On failure (e.g. if memory is unavailable), %NULL.
 */
struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
		struct device *dev, const char *bus_name)
{
	return __usb_create_hcd(driver, dev, dev, bus_name, NULL);
}
EXPORT_SYMBOL_GPL(usb_create_hcd);

/*
 * Roothubs that share one PCI device must also share the bandwidth mutex.
 * Don't deallocate the bandwidth_mutex until the last shared usb_hcd is
 * deallocated.
 *
 * Make sure to deallocate the bandwidth_mutex only when the last HCD is
 * freed.  When hcd_release() is called for either hcd in a peer set,
 * invalidate the peer's ->shared_hcd and ->primary_hcd pointers.
 */
static void hcd_release(struct kref *kref)
{
	struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);

	mutex_lock(&usb_port_peer_mutex);
	if (hcd->shared_hcd) {
		struct usb_hcd *peer = hcd->shared_hcd;

		peer->shared_hcd = NULL;
		peer->primary_hcd = NULL;
	} else {
		kfree(hcd->address0_mutex);
		kfree(hcd->bandwidth_mutex);
	}
	mutex_unlock(&usb_port_peer_mutex);
	kfree(hcd);
}

struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd)
{
	if (hcd)
		kref_get (&hcd->kref);
	return hcd;
}
EXPORT_SYMBOL_GPL(usb_get_hcd);

void usb_put_hcd (struct usb_hcd *hcd)
{
	if (hcd)
		kref_put (&hcd->kref, hcd_release);
}
EXPORT_SYMBOL_GPL(usb_put_hcd);

int usb_hcd_is_primary_hcd(struct usb_hcd *hcd)
{
	if (!hcd->primary_hcd)
		return 1;
	return hcd == hcd->primary_hcd;
}
EXPORT_SYMBOL_GPL(usb_hcd_is_primary_hcd);

int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1)
{
	if (!hcd->driver->find_raw_port_number)
		return port1;

	return hcd->driver->find_raw_port_number(hcd, port1);
}

static int usb_hcd_request_irqs(struct usb_hcd *hcd,
		unsigned int irqnum, unsigned long irqflags)
{
	int retval;

	if (hcd->driver->irq) {

		snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
				hcd->driver->description, hcd->self.busnum);
		retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
				hcd->irq_descr, hcd);
		if (retval != 0) {
			dev_err(hcd->self.controller,
					"request interrupt %d failed\n",
					irqnum);
			return retval;
		}
		hcd->irq = irqnum;
		dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
				(hcd->driver->flags & HCD_MEMORY) ?
					"io mem" : "io port",
				(unsigned long long)hcd->rsrc_start);
	} else {
		hcd->irq = 0;
		if (hcd->rsrc_start)
			dev_info(hcd->self.controller, "%s 0x%08llx\n",
					(hcd->driver->flags & HCD_MEMORY) ?
						"io mem" : "io port",
					(unsigned long long)hcd->rsrc_start);
	}
	return 0;
}

/*
 * Before we free this root hub, flush in-flight peering attempts
 * and disable peer lookups
 */
static void usb_put_invalidate_rhdev(struct usb_hcd *hcd)
{
	struct usb_device *rhdev;

	mutex_lock(&usb_port_peer_mutex);
	rhdev = hcd->self.root_hub;
	hcd->self.root_hub = NULL;
	mutex_unlock(&usb_port_peer_mutex);
	usb_put_dev(rhdev);
}

/**
 * usb_stop_hcd - Halt the HCD
 * @hcd: the usb_hcd that has to be halted
 *
 * Stop the root-hub polling timer and invoke the HCD's ->stop callback.
 */
static void usb_stop_hcd(struct usb_hcd *hcd)
{
	hcd->rh_pollable = 0;
	clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
	del_timer_sync(&hcd->rh_timer);

	hcd->driver->stop(hcd);
	hcd->state = HC_STATE_HALT;

	/* In case the HCD restarted the timer, stop it again. */
	clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
	del_timer_sync(&hcd->rh_timer);
}

/**
 * usb_add_hcd - finish generic HCD structure initialization and register
 * @hcd: the usb_hcd structure to initialize
 * @irqnum: Interrupt line to allocate
 * @irqflags: Interrupt type flags
 *
 * Finish the remaining parts of generic HCD initialization: allocate the
 * buffers of consistent memory, register the bus, request the IRQ line,
 * and call the driver's reset() and start() routines.
 */
int usb_add_hcd(struct usb_hcd *hcd,
		unsigned int irqnum, unsigned long irqflags)
{
	int retval;
	struct usb_device *rhdev;

	if (!hcd->skip_phy_initialization && usb_hcd_is_primary_hcd(hcd)) {
		hcd->phy_roothub = usb_phy_roothub_alloc(hcd->self.sysdev);
		if (IS_ERR(hcd->phy_roothub))
			return PTR_ERR(hcd->phy_roothub);

		retval = usb_phy_roothub_init(hcd->phy_roothub);
		if (retval)
			return retval;

		retval = usb_phy_roothub_set_mode(hcd->phy_roothub,
						  PHY_MODE_USB_HOST_SS);
		if (retval)
			retval = usb_phy_roothub_set_mode(hcd->phy_roothub,
							  PHY_MODE_USB_HOST);
		if (retval)
			goto err_usb_phy_roothub_power_on;

		retval = usb_phy_roothub_power_on(hcd->phy_roothub);
		if (retval)
			goto err_usb_phy_roothub_power_on;
	}

	dev_info(hcd->self.controller, "%s\n", hcd->product_desc);

	switch (authorized_default) {
	case USB_AUTHORIZE_NONE:
		hcd->dev_policy = USB_DEVICE_AUTHORIZE_NONE;
		break;

	case USB_AUTHORIZE_ALL:
		hcd->dev_policy = USB_DEVICE_AUTHORIZE_ALL;
		break;

	case USB_AUTHORIZE_INTERNAL:
		hcd->dev_policy = USB_DEVICE_AUTHORIZE_INTERNAL;
		break;

	case USB_AUTHORIZE_WIRED:
	default:
		hcd->dev_policy = hcd->wireless ?
			USB_DEVICE_AUTHORIZE_NONE : USB_DEVICE_AUTHORIZE_ALL;
		break;
	}

	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);

	/* per default all interfaces are authorized */
	set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);

	/* HC is in reset state, but accessible.  Now do the one-time init,
	 * bottom up so that hcds can customize the root hubs before hub_wq
	 * starts talking to them.  (Note, bus id is assigned early too.)
	 */
	retval = hcd_buffer_create(hcd);
	if (retval != 0) {
		dev_dbg(hcd->self.sysdev, "pool alloc failed\n");
		goto err_create_buf;
	}

	retval = usb_register_bus(&hcd->self);
	if (retval < 0)
		goto err_register_bus;

	rhdev = usb_alloc_dev(NULL, &hcd->self, 0);
	if (rhdev == NULL) {
		dev_err(hcd->self.sysdev, "unable to allocate root hub\n");
		retval = -ENOMEM;
		goto err_allocate_root_hub;
	}
	mutex_lock(&usb_port_peer_mutex);
	hcd->self.root_hub = rhdev;
	mutex_unlock(&usb_port_peer_mutex);

	rhdev->rx_lanes = 1;
	rhdev->tx_lanes = 1;
	rhdev->ssp_rate = USB_SSP_GEN_UNKNOWN;

	switch (hcd->speed) {
	case HCD_USB11:
		rhdev->speed = USB_SPEED_FULL;
		break;
	case HCD_USB2:
		rhdev->speed = USB_SPEED_HIGH;
		break;
	case HCD_USB25:
		rhdev->speed = USB_SPEED_WIRELESS;
		break;
	case HCD_USB3:
		rhdev->speed = USB_SPEED_SUPER;
		break;
	case HCD_USB32:
		rhdev->rx_lanes = 2;
		rhdev->tx_lanes = 2;
		rhdev->ssp_rate = USB_SSP_GEN_2x2;
		rhdev->speed = USB_SPEED_SUPER_PLUS;
		break;
	case HCD_USB31:
		rhdev->ssp_rate = USB_SSP_GEN_2x1;
		rhdev->speed = USB_SPEED_SUPER_PLUS;
		break;
	default:
		retval = -EINVAL;
		goto err_set_rh_speed;
	}

	/* wakeup flag init defaults to "everything works" for root hubs,
	 * but drivers can override it in reset() if needed, along with
	 * recording the overall controller's system wakeup capability.
	 */
	device_set_wakeup_capable(&rhdev->dev, 1);

	/* HCD_FLAG_RH_RUNNING doesn't matter until the root hub is
	 * registered.  But since the controller can die at any time,
	 * let's initialize the flag before touching the hardware.
	 */
	set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);

	/* "reset" is misnamed; its role is now one-time init. the controller
	 * should already have been reset (and boot firmware kicked off etc).
	 */
	if (hcd->driver->reset) {
		retval = hcd->driver->reset(hcd);
		if (retval < 0) {
			dev_err(hcd->self.controller, "can't setup: %d\n",
					retval);
			goto err_hcd_driver_setup;
		}
	}
	hcd->rh_pollable = 1;

	retval = usb_phy_roothub_calibrate(hcd->phy_roothub);
	if (retval)
		goto err_hcd_driver_setup;

	/* NOTE: root hub and controller capabilities may not be the same */
	if (device_can_wakeup(hcd->self.controller)
			&& device_can_wakeup(&hcd->self.root_hub->dev))
		dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");

	/* initialize tasklets */
	init_giveback_urb_bh(&hcd->high_prio_bh);
	init_giveback_urb_bh(&hcd->low_prio_bh);

	/* enable irqs just before we start the controller,
	 * if the BIOS provides legacy PCI irqs.
	 */
	if (usb_hcd_is_primary_hcd(hcd) && irqnum) {
		retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
		if (retval)
			goto err_request_irq;
	}

	hcd->state = HC_STATE_RUNNING;
	retval = hcd->driver->start(hcd);
	if (retval < 0) {
		dev_err(hcd->self.controller, "startup error %d\n", retval);
		goto err_hcd_driver_start;
	}

	/* starting here, usbcore will pay attention to this root hub */
	retval = register_root_hub(hcd);
	if (retval != 0)
		goto err_register_root_hub;

	if (hcd->uses_new_polling && HCD_POLL_RH(hcd))
		usb_hcd_poll_rh_status(hcd);

	return retval;

err_register_root_hub:
	usb_stop_hcd(hcd);
err_hcd_driver_start:
	if (usb_hcd_is_primary_hcd(hcd) && hcd->irq > 0)
		free_irq(irqnum, hcd);
err_request_irq:
err_hcd_driver_setup:
err_set_rh_speed:
	usb_put_invalidate_rhdev(hcd);
err_allocate_root_hub:
	usb_deregister_bus(&hcd->self);
err_register_bus:
	hcd_buffer_destroy(hcd);
err_create_buf:
	usb_phy_roothub_power_off(hcd->phy_roothub);
err_usb_phy_roothub_power_on:
	usb_phy_roothub_exit(hcd->phy_roothub);

	return retval;
}
EXPORT_SYMBOL_GPL(usb_add_hcd);

/**
 * usb_remove_hcd - shutdown processing for generic HCDs
 * @hcd: the usb_hcd structure to remove
 *
 * Context: task context, might sleep.
 *
 * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
 * invoking the HCD's stop() method.
 */
void usb_remove_hcd(struct usb_hcd *hcd)
{
	struct usb_device *rhdev = hcd->self.root_hub;

	dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);

	usb_get_dev(rhdev);
	clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
	if (HC_IS_RUNNING (hcd->state))
		hcd->state = HC_STATE_QUIESCING;

	dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
	spin_lock_irq (&hcd_root_hub_lock);
	hcd->rh_registered = 0;
	spin_unlock_irq (&hcd_root_hub_lock);

#ifdef CONFIG_PM
	cancel_work_sync(&hcd->wakeup_work);
#endif
	cancel_work_sync(&hcd->died_work);

	mutex_lock(&usb_bus_idr_lock);
	usb_disconnect(&rhdev);		/* Sets rhdev to NULL */
	mutex_unlock(&usb_bus_idr_lock);

	/*
	 * tasklet_kill() isn't needed here because:
	 * - driver's disconnect() called from usb_disconnect() should
	 *   make sure its URBs are completed during the disconnect()
	 *   callback
	 *
	 * - it is too late to run complete() here since driver may have
	 *   been removed already now
	 */

	/* Prevent any more root-hub status calls from the timer.
	 * The HCD might still restart the timer (if a port status change
	 * interrupt occurs), but usb_hcd_poll_rh_status() won't invoke
	 * the hub_status_data() callback.
	 */
	usb_stop_hcd(hcd);

	if (usb_hcd_is_primary_hcd(hcd)) {
		if (hcd->irq > 0)
			free_irq(hcd->irq, hcd);
	}

	usb_deregister_bus(&hcd->self);
	hcd_buffer_destroy(hcd);

	usb_phy_roothub_power_off(hcd->phy_roothub);
	usb_phy_roothub_exit(hcd->phy_roothub);

	usb_put_invalidate_rhdev(hcd);
	hcd->flags = 0;
}
EXPORT_SYMBOL_GPL(usb_remove_hcd);

void
usb_hcd_platform_shutdown(struct platform_device *dev)
{
	struct usb_hcd *hcd = platform_get_drvdata(dev);

	/* No need for pm_runtime_put(), we're shutting down */
	pm_runtime_get_sync(&dev->dev);

	if (hcd->driver->shutdown)
		hcd->driver->shutdown(hcd);
}
EXPORT_SYMBOL_GPL(usb_hcd_platform_shutdown);

int usb_hcd_setup_local_mem(struct usb_hcd *hcd, phys_addr_t phys_addr,
			    dma_addr_t dma, size_t size)
{
	int err;
	void *local_mem;

	hcd->localmem_pool = devm_gen_pool_create(hcd->self.sysdev, 4,
						  dev_to_node(hcd->self.sysdev),
						  dev_name(hcd->self.sysdev));
	if (IS_ERR(hcd->localmem_pool))
		return PTR_ERR(hcd->localmem_pool);

	local_mem = devm_memremap(hcd->self.sysdev, phys_addr,
				  size, MEMREMAP_WC);
	if (IS_ERR(local_mem))
		return PTR_ERR(local_mem);

	/*
	 * Here we pass a dma_addr_t but the arg type is a phys_addr_t.
	 * It's not backed by system memory and thus there's no kernel mapping
	 * for it.
	 */
	err = gen_pool_add_virt(hcd->localmem_pool, (unsigned long)local_mem,
				dma, size, dev_to_node(hcd->self.sysdev));
	if (err < 0) {
		dev_err(hcd->self.sysdev, "gen_pool_add_virt failed with %d\n",
			err);
		return err;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(usb_hcd_setup_local_mem);

/*-------------------------------------------------------------------------*/

#if IS_ENABLED(CONFIG_USB_MON)

const struct usb_mon_operations *mon_ops;

/*
 * The registration is unlocked.
 * We do it this way because we do not want to lock in hot paths.
 *
 * Notice that the code is minimally error-proof. Because usbmon needs
 * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
 */

int usb_mon_register(const struct usb_mon_operations *ops)
{

	if (mon_ops)
		return -EBUSY;

	mon_ops = ops;
	mb();
	return 0;
}
EXPORT_SYMBOL_GPL (usb_mon_register);

void usb_mon_deregister (void)
{

	if (mon_ops == NULL) {
		printk(KERN_ERR "USB: monitor was not registered\n");
		return;
	}
	mon_ops = NULL;
	mb();
}
EXPORT_SYMBOL_GPL (usb_mon_deregister);

#endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */