summaryrefslogtreecommitdiff
path: root/drivers/s390/char/raw3270.c
blob: e21a5c39ef20f2f29609ee989eb75213e6f99f84 (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
/*
 * IBM/3270 Driver - core functions.
 *
 * Author(s):
 *   Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
 *   Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
 *     Copyright IBM Corp. 2003, 2009
 */

#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/wait.h>

#include <asm/ccwdev.h>
#include <asm/cio.h>
#include <asm/ebcdic.h>
#include <asm/diag.h>

#include "raw3270.h"

#include <linux/major.h>
#include <linux/kdev_t.h>
#include <linux/device.h>
#include <linux/mutex.h>

static struct class *class3270;

/* The main 3270 data structure. */
struct raw3270 {
	struct list_head list;
	struct ccw_device *cdev;
	int minor;

	short model, rows, cols;
	unsigned long flags;

	struct list_head req_queue;	/* Request queue. */
	struct list_head view_list;	/* List of available views. */
	struct raw3270_view *view;	/* Active view. */

	struct timer_list timer;	/* Device timer. */

	unsigned char *ascebc;		/* ascii -> ebcdic table */
	struct device *clttydev;	/* 3270-class tty device ptr */
	struct device *cltubdev;	/* 3270-class tub device ptr */

	struct raw3270_request init_request;
	unsigned char init_data[256];
};

/* raw3270->flags */
#define RAW3270_FLAGS_14BITADDR	0	/* 14-bit buffer addresses */
#define RAW3270_FLAGS_BUSY	1	/* Device busy, leave it alone */
#define RAW3270_FLAGS_ATTN	2	/* Device sent an ATTN interrupt */
#define RAW3270_FLAGS_READY	4	/* Device is useable by views */
#define RAW3270_FLAGS_CONSOLE	8	/* Device is the console. */
#define RAW3270_FLAGS_FROZEN	16	/* set if 3270 is frozen for suspend */

/* Semaphore to protect global data of raw3270 (devices, views, etc). */
static DEFINE_MUTEX(raw3270_mutex);

/* List of 3270 devices. */
static LIST_HEAD(raw3270_devices);

/*
 * Flag to indicate if the driver has been registered. Some operations
 * like waiting for the end of i/o need to be done differently as long
 * as the kernel is still starting up (console support).
 */
static int raw3270_registered;

/* Module parameters */
static int tubxcorrect = 0;
module_param(tubxcorrect, bool, 0);

/*
 * Wait queue for device init/delete, view delete.
 */
DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue);

/*
 * Encode array for 12 bit 3270 addresses.
 */
static unsigned char raw3270_ebcgraf[64] =	{
	0x40, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
	0xc8, 0xc9, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
	0x50, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
	0xd8, 0xd9, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
	0x60, 0x61, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
	0xe8, 0xe9, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
	0xf8, 0xf9, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f
};

void
raw3270_buffer_address(struct raw3270 *rp, char *cp, unsigned short addr)
{
	if (test_bit(RAW3270_FLAGS_14BITADDR, &rp->flags)) {
		cp[0] = (addr >> 8) & 0x3f;
		cp[1] = addr & 0xff;
	} else {
		cp[0] = raw3270_ebcgraf[(addr >> 6) & 0x3f];
		cp[1] = raw3270_ebcgraf[addr & 0x3f];
	}
}

/*
 * Allocate a new 3270 ccw request
 */
struct raw3270_request *
raw3270_request_alloc(size_t size)
{
	struct raw3270_request *rq;

	/* Allocate request structure */
	rq = kzalloc(sizeof(struct raw3270_request), GFP_KERNEL | GFP_DMA);
	if (!rq)
		return ERR_PTR(-ENOMEM);

	/* alloc output buffer. */
	if (size > 0) {
		rq->buffer = kmalloc(size, GFP_KERNEL | GFP_DMA);
		if (!rq->buffer) {
			kfree(rq);
			return ERR_PTR(-ENOMEM);
		}
	}
	rq->size = size;
	INIT_LIST_HEAD(&rq->list);

	/*
	 * Setup ccw.
	 */
	rq->ccw.cda = __pa(rq->buffer);
	rq->ccw.flags = CCW_FLAG_SLI;

	return rq;
}

/*
 * Free 3270 ccw request
 */
void
raw3270_request_free (struct raw3270_request *rq)
{
	kfree(rq->buffer);
	kfree(rq);
}

/*
 * Reset request to initial state.
 */
void
raw3270_request_reset(struct raw3270_request *rq)
{
	BUG_ON(!list_empty(&rq->list));
	rq->ccw.cmd_code = 0;
	rq->ccw.count = 0;
	rq->ccw.cda = __pa(rq->buffer);
	rq->ccw.flags = CCW_FLAG_SLI;
	rq->rescnt = 0;
	rq->rc = 0;
}

/*
 * Set command code to ccw of a request.
 */
void
raw3270_request_set_cmd(struct raw3270_request *rq, u8 cmd)
{
	rq->ccw.cmd_code = cmd;
}

/*
 * Add data fragment to output buffer.
 */
int
raw3270_request_add_data(struct raw3270_request *rq, void *data, size_t size)
{
	if (size + rq->ccw.count > rq->size)
		return -E2BIG;
	memcpy(rq->buffer + rq->ccw.count, data, size);
	rq->ccw.count += size;
	return 0;
}

/*
 * Set address/length pair to ccw of a request.
 */
void
raw3270_request_set_data(struct raw3270_request *rq, void *data, size_t size)
{
	rq->ccw.cda = __pa(data);
	rq->ccw.count = size;
}

/*
 * Set idal buffer to ccw of a request.
 */
void
raw3270_request_set_idal(struct raw3270_request *rq, struct idal_buffer *ib)
{
	rq->ccw.cda = __pa(ib->data);
	rq->ccw.count = ib->size;
	rq->ccw.flags |= CCW_FLAG_IDA;
}

/*
 * Stop running ccw.
 */
static int
raw3270_halt_io_nolock(struct raw3270 *rp, struct raw3270_request *rq)
{
	int retries;
	int rc;

	if (raw3270_request_final(rq))
		return 0;
	/* Check if interrupt has already been processed */
	for (retries = 0; retries < 5; retries++) {
		if (retries < 2)
			rc = ccw_device_halt(rp->cdev, (long) rq);
		else
			rc = ccw_device_clear(rp->cdev, (long) rq);
		if (rc == 0)
			break;		/* termination successful */
	}
	return rc;
}

static int
raw3270_halt_io(struct raw3270 *rp, struct raw3270_request *rq)
{
	unsigned long flags;
	int rc;

	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
	rc = raw3270_halt_io_nolock(rp, rq);
	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
	return rc;
}

/*
 * Add the request to the request queue, try to start it if the
 * 3270 device is idle. Return without waiting for end of i/o.
 */
static int
__raw3270_start(struct raw3270 *rp, struct raw3270_view *view,
		struct raw3270_request *rq)
{
	rq->view = view;
	raw3270_get_view(view);
	if (list_empty(&rp->req_queue) &&
	    !test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
		/* No other requests are on the queue. Start this one. */
		rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
					       (unsigned long) rq, 0, 0);
		if (rq->rc) {
			raw3270_put_view(view);
			return rq->rc;
		}
	}
	list_add_tail(&rq->list, &rp->req_queue);
	return 0;
}

int
raw3270_start(struct raw3270_view *view, struct raw3270_request *rq)
{
	unsigned long flags;
	struct raw3270 *rp;
	int rc;

	spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
	rp = view->dev;
	if (!rp || rp->view != view ||
	    test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
		rc = -EACCES;
	else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
		rc = -ENODEV;
	else
		rc =  __raw3270_start(rp, view, rq);
	spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
	return rc;
}

int
raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq)
{
	struct raw3270 *rp;
	int rc;

	rp = view->dev;
	if (!rp || rp->view != view ||
	    test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
		rc = -EACCES;
	else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
		rc = -ENODEV;
	else
		rc =  __raw3270_start(rp, view, rq);
	return rc;
}

int
raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq)
{
	struct raw3270 *rp;

	rp = view->dev;
	rq->view = view;
	raw3270_get_view(view);
	list_add_tail(&rq->list, &rp->req_queue);
	return 0;
}

/*
 * 3270 interrupt routine, called from the ccw_device layer
 */
static void
raw3270_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
{
	struct raw3270 *rp;
	struct raw3270_view *view;
	struct raw3270_request *rq;
	int rc;

	kstat_cpu(smp_processor_id()).irqs[IOINT_C70]++;
	rp = dev_get_drvdata(&cdev->dev);
	if (!rp)
		return;
	rq = (struct raw3270_request *) intparm;
	view = rq ? rq->view : rp->view;

	if (IS_ERR(irb))
		rc = RAW3270_IO_RETRY;
	else if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
		rq->rc = -EIO;
		rc = RAW3270_IO_DONE;
	} else if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END |
					   DEV_STAT_UNIT_EXCEP)) {
		/* Handle CE-DE-UE and subsequent UDE */
		set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
		rc = RAW3270_IO_BUSY;
	} else if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
		/* Wait for UDE if busy flag is set. */
		if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
			clear_bit(RAW3270_FLAGS_BUSY, &rp->flags);
			/* Got it, now retry. */
			rc = RAW3270_IO_RETRY;
		} else
			rc = RAW3270_IO_BUSY;
	} else if (view)
		rc = view->fn->intv(view, rq, irb);
	else
		rc = RAW3270_IO_DONE;

	switch (rc) {
	case RAW3270_IO_DONE:
		break;
	case RAW3270_IO_BUSY:
		/* 
		 * Intervention required by the operator. We have to wait
		 * for unsolicited device end.
		 */
		return;
	case RAW3270_IO_RETRY:
		if (!rq)
			break;
		rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
					  (unsigned long) rq, 0, 0);
		if (rq->rc == 0)
			return;	/* Successfully restarted. */
		break;
	case RAW3270_IO_STOP:
		if (!rq)
			break;
		raw3270_halt_io_nolock(rp, rq);
		rq->rc = -EIO;
		break;
	default:
		BUG();
	}
	if (rq) {
		BUG_ON(list_empty(&rq->list));
		/* The request completed, remove from queue and do callback. */
		list_del_init(&rq->list);
		if (rq->callback)
			rq->callback(rq, rq->callback_data);
		/* Do put_device for get_device in raw3270_start. */
		raw3270_put_view(view);
	}
	/*
	 * Try to start each request on request queue until one is
	 * started successful.
	 */
	while (!list_empty(&rp->req_queue)) {
		rq = list_entry(rp->req_queue.next,struct raw3270_request,list);
		rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
					  (unsigned long) rq, 0, 0);
		if (rq->rc == 0)
			break;
		/* Start failed. Remove request and do callback. */
		list_del_init(&rq->list);
		if (rq->callback)
			rq->callback(rq, rq->callback_data);
		/* Do put_device for get_device in raw3270_start. */
		raw3270_put_view(view);
	}
}

/*
 * Size sensing.
 */

struct raw3270_ua {	/* Query Reply structure for Usable Area */
	struct {	/* Usable Area Query Reply Base */
		short l;	/* Length of this structured field */
		char  sfid;	/* 0x81 if Query Reply */
		char  qcode;	/* 0x81 if Usable Area */
		char  flags0;
		char  flags1;
		short w;	/* Width of usable area */
		short h;	/* Heigth of usavle area */
		char  units;	/* 0x00:in; 0x01:mm */
		int   xr;
		int   yr;
		char  aw;
		char  ah;
		short buffsz;	/* Character buffer size, bytes */
		char  xmin;
		char  ymin;
		char  xmax;
		char  ymax;
	} __attribute__ ((packed)) uab;
	struct {	/* Alternate Usable Area Self-Defining Parameter */
		char  l;	/* Length of this Self-Defining Parm */
		char  sdpid;	/* 0x02 if Alternate Usable Area */
		char  res;
		char  auaid;	/* 0x01 is Id for the A U A */
		short wauai;	/* Width of AUAi */
		short hauai;	/* Height of AUAi */
		char  auaunits;	/* 0x00:in, 0x01:mm */
		int   auaxr;
		int   auayr;
		char  awauai;
		char  ahauai;
	} __attribute__ ((packed)) aua;
} __attribute__ ((packed));

static struct diag210 raw3270_init_diag210;
static DEFINE_MUTEX(raw3270_init_mutex);

static int
raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq,
		 struct irb *irb)
{
	/*
	 * Unit-Check Processing:
	 * Expect Command Reject or Intervention Required.
	 */
	if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
		/* Request finished abnormally. */
		if (irb->ecw[0] & SNS0_INTERVENTION_REQ) {
			set_bit(RAW3270_FLAGS_BUSY, &view->dev->flags);
			return RAW3270_IO_BUSY;
		}
	}
	if (rq) {
		if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
			if (irb->ecw[0] & SNS0_CMD_REJECT)
				rq->rc = -EOPNOTSUPP;
			else
				rq->rc = -EIO;
		} else
			/* Request finished normally. Copy residual count. */
			rq->rescnt = irb->scsw.cmd.count;
	}
	if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
		set_bit(RAW3270_FLAGS_ATTN, &view->dev->flags);
		wake_up(&raw3270_wait_queue);
	}
	return RAW3270_IO_DONE;
}

static struct raw3270_fn raw3270_init_fn = {
	.intv = raw3270_init_irq
};

static struct raw3270_view raw3270_init_view = {
	.fn = &raw3270_init_fn
};

/*
 * raw3270_wait/raw3270_wait_interruptible/__raw3270_wakeup
 * Wait for end of request. The request must have been started
 * with raw3270_start, rc = 0. The device lock may NOT have been
 * released between calling raw3270_start and raw3270_wait.
 */
static void
raw3270_wake_init(struct raw3270_request *rq, void *data)
{
	wake_up((wait_queue_head_t *) data);
}

/*
 * Special wait function that can cope with console initialization.
 */
static int
raw3270_start_init(struct raw3270 *rp, struct raw3270_view *view,
		   struct raw3270_request *rq)
{
	unsigned long flags;
	int rc;

#ifdef CONFIG_TN3270_CONSOLE
	if (raw3270_registered == 0) {
		spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
		rq->callback = NULL;
		rc = __raw3270_start(rp, view, rq);
		if (rc == 0)
			while (!raw3270_request_final(rq)) {
				wait_cons_dev();
				barrier();
			}
		spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
		return rq->rc;
	}
#endif
	rq->callback = raw3270_wake_init;
	rq->callback_data = &raw3270_wait_queue;
	spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
	rc = __raw3270_start(rp, view, rq);
	spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
	if (rc)
		return rc;
	/* Now wait for the completion. */
	rc = wait_event_interruptible(raw3270_wait_queue,
				      raw3270_request_final(rq));
	if (rc == -ERESTARTSYS) {	/* Interrupted by a signal. */
		raw3270_halt_io(view->dev, rq);
		/* No wait for the halt to complete. */
		wait_event(raw3270_wait_queue, raw3270_request_final(rq));
		return -ERESTARTSYS;
	}
	return rq->rc;
}

static int
__raw3270_size_device_vm(struct raw3270 *rp)
{
	int rc, model;
	struct ccw_dev_id dev_id;

	ccw_device_get_id(rp->cdev, &dev_id);
	raw3270_init_diag210.vrdcdvno = dev_id.devno;
	raw3270_init_diag210.vrdclen = sizeof(struct diag210);
	rc = diag210(&raw3270_init_diag210);
	if (rc)
		return rc;
	model = raw3270_init_diag210.vrdccrmd;
	switch (model) {
	case 2:
		rp->model = model;
		rp->rows = 24;
		rp->cols = 80;
		break;
	case 3:
		rp->model = model;
		rp->rows = 32;
		rp->cols = 80;
		break;
	case 4:
		rp->model = model;
		rp->rows = 43;
		rp->cols = 80;
		break;
	case 5:
		rp->model = model;
		rp->rows = 27;
		rp->cols = 132;
		break;
	default:
		rc = -EOPNOTSUPP;
		break;
	}
	return rc;
}

static int
__raw3270_size_device(struct raw3270 *rp)
{
	static const unsigned char wbuf[] =
		{ 0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81 };
	struct raw3270_ua *uap;
	unsigned short count;
	int rc;

	/*
	 * To determine the size of the 3270 device we need to do:
	 * 1) send a 'read partition' data stream to the device
	 * 2) wait for the attn interrupt that precedes the query reply
	 * 3) do a read modified to get the query reply
	 * To make things worse we have to cope with intervention
	 * required (3270 device switched to 'stand-by') and command
	 * rejects (old devices that can't do 'read partition').
	 */
	memset(&rp->init_request, 0, sizeof(rp->init_request));
	memset(&rp->init_data, 0, 256);
	/* Store 'read partition' data stream to init_data */
	memcpy(&rp->init_data, wbuf, sizeof(wbuf));
	INIT_LIST_HEAD(&rp->init_request.list);
	rp->init_request.ccw.cmd_code = TC_WRITESF;
	rp->init_request.ccw.flags = CCW_FLAG_SLI;
	rp->init_request.ccw.count = sizeof(wbuf);
	rp->init_request.ccw.cda = (__u32) __pa(&rp->init_data);

	rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);
	if (rc)
		/* Check error cases: -ERESTARTSYS, -EIO and -EOPNOTSUPP */
		return rc;

	/* Wait for attention interrupt. */
#ifdef CONFIG_TN3270_CONSOLE
	if (raw3270_registered == 0) {
		unsigned long flags;

		spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
		while (!test_and_clear_bit(RAW3270_FLAGS_ATTN, &rp->flags))
			wait_cons_dev();
		spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
	} else
#endif
		rc = wait_event_interruptible(raw3270_wait_queue,
			test_and_clear_bit(RAW3270_FLAGS_ATTN, &rp->flags));
	if (rc)
		return rc;

	/*
	 * The device accepted the 'read partition' command. Now
	 * set up a read ccw and issue it.
	 */
	rp->init_request.ccw.cmd_code = TC_READMOD;
	rp->init_request.ccw.flags = CCW_FLAG_SLI;
	rp->init_request.ccw.count = sizeof(rp->init_data);
	rp->init_request.ccw.cda = (__u32) __pa(rp->init_data);
	rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);
	if (rc)
		return rc;
	/* Got a Query Reply */
	count = sizeof(rp->init_data) - rp->init_request.rescnt;
	uap = (struct raw3270_ua *) (rp->init_data + 1);
	/* Paranoia check. */
	if (rp->init_data[0] != 0x88 || uap->uab.qcode != 0x81)
		return -EOPNOTSUPP;
	/* Copy rows/columns of default Usable Area */
	rp->rows = uap->uab.h;
	rp->cols = uap->uab.w;
	/* Check for 14 bit addressing */
	if ((uap->uab.flags0 & 0x0d) == 0x01)
		set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags);
	/* Check for Alternate Usable Area */
	if (uap->uab.l == sizeof(struct raw3270_ua) &&
	    uap->aua.sdpid == 0x02) {
		rp->rows = uap->aua.hauai;
		rp->cols = uap->aua.wauai;
	}
	return 0;
}

static int
raw3270_size_device(struct raw3270 *rp)
{
	int rc;

	mutex_lock(&raw3270_init_mutex);
	rp->view = &raw3270_init_view;
	raw3270_init_view.dev = rp;
	if (MACHINE_IS_VM)
		rc = __raw3270_size_device_vm(rp);
	else
		rc = __raw3270_size_device(rp);
	raw3270_init_view.dev = NULL;
	rp->view = NULL;
	mutex_unlock(&raw3270_init_mutex);
	if (rc == 0) {	/* Found something. */
		/* Try to find a model. */
		rp->model = 0;
		if (rp->rows == 24 && rp->cols == 80)
			rp->model = 2;
		if (rp->rows == 32 && rp->cols == 80)
			rp->model = 3;
		if (rp->rows == 43 && rp->cols == 80)
			rp->model = 4;
		if (rp->rows == 27 && rp->cols == 132)
			rp->model = 5;
	} else {
		/* Couldn't detect size. Use default model 2. */
		rp->model = 2;
		rp->rows = 24;
		rp->cols = 80;
		return 0;
	}
	return rc;
}

static int
raw3270_reset_device(struct raw3270 *rp)
{
	int rc;

	mutex_lock(&raw3270_init_mutex);
	memset(&rp->init_request, 0, sizeof(rp->init_request));
	memset(&rp->init_data, 0, sizeof(rp->init_data));
	/* Store reset data stream to init_data/init_request */
	rp->init_data[0] = TW_KR;
	INIT_LIST_HEAD(&rp->init_request.list);
	rp->init_request.ccw.cmd_code = TC_EWRITEA;
	rp->init_request.ccw.flags = CCW_FLAG_SLI;
	rp->init_request.ccw.count = 1;
	rp->init_request.ccw.cda = (__u32) __pa(rp->init_data);
	rp->view = &raw3270_init_view;
	raw3270_init_view.dev = rp;
	rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);
	raw3270_init_view.dev = NULL;
	rp->view = NULL;
	mutex_unlock(&raw3270_init_mutex);
	return rc;
}

int
raw3270_reset(struct raw3270_view *view)
{
	struct raw3270 *rp;
	int rc;

	rp = view->dev;
	if (!rp || rp->view != view ||
	    test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
		rc = -EACCES;
	else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
		rc = -ENODEV;
	else
		rc = raw3270_reset_device(view->dev);
	return rc;
}

/*
 * Setup new 3270 device.
 */
static int
raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp, char *ascebc)
{
	struct list_head *l;
	struct raw3270 *tmp;
	int minor;

	memset(rp, 0, sizeof(struct raw3270));
	/* Copy ebcdic -> ascii translation table. */
	memcpy(ascebc, _ascebc, 256);
	if (tubxcorrect) {
		/* correct brackets and circumflex */
		ascebc['['] = 0xad;
		ascebc[']'] = 0xbd;
		ascebc['^'] = 0xb0;
	}
	rp->ascebc = ascebc;

	/* Set defaults. */
	rp->rows = 24;
	rp->cols = 80;

	INIT_LIST_HEAD(&rp->req_queue);
	INIT_LIST_HEAD(&rp->view_list);

	/*
	 * Add device to list and find the smallest unused minor
	 * number for it. Note: there is no device with minor 0,
	 * see special case for fs3270.c:fs3270_open().
	 */
	mutex_lock(&raw3270_mutex);
	/* Keep the list sorted. */
	minor = RAW3270_FIRSTMINOR;
	rp->minor = -1;
	list_for_each(l, &raw3270_devices) {
		tmp = list_entry(l, struct raw3270, list);
		if (tmp->minor > minor) {
			rp->minor = minor;
			__list_add(&rp->list, l->prev, l);
			break;
		}
		minor++;
	}
	if (rp->minor == -1 && minor < RAW3270_MAXDEVS + RAW3270_FIRSTMINOR) {
		rp->minor = minor;
		list_add_tail(&rp->list, &raw3270_devices);
	}
	mutex_unlock(&raw3270_mutex);
	/* No free minor number? Then give up. */
	if (rp->minor == -1)
		return -EUSERS;
	rp->cdev = cdev;
	dev_set_drvdata(&cdev->dev, rp);
	cdev->handler = raw3270_irq;
	return 0;
}

#ifdef CONFIG_TN3270_CONSOLE
/*
 * Setup 3270 device configured as console.
 */
struct raw3270 __init *raw3270_setup_console(struct ccw_device *cdev)
{
	struct raw3270 *rp;
	char *ascebc;
	int rc;

	rp = kzalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
	ascebc = kzalloc(256, GFP_KERNEL);
	rc = raw3270_setup_device(cdev, rp, ascebc);
	if (rc)
		return ERR_PTR(rc);
	set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags);
	rc = raw3270_reset_device(rp);
	if (rc)
		return ERR_PTR(rc);
	rc = raw3270_size_device(rp);
	if (rc)
		return ERR_PTR(rc);
	rc = raw3270_reset_device(rp);
	if (rc)
		return ERR_PTR(rc);
	set_bit(RAW3270_FLAGS_READY, &rp->flags);
	return rp;
}

void
raw3270_wait_cons_dev(struct raw3270 *rp)
{
	unsigned long flags;

	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
	wait_cons_dev();
	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
}

#endif

/*
 * Create a 3270 device structure.
 */
static struct raw3270 *
raw3270_create_device(struct ccw_device *cdev)
{
	struct raw3270 *rp;
	char *ascebc;
	int rc;

	rp = kmalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
	if (!rp)
		return ERR_PTR(-ENOMEM);
	ascebc = kmalloc(256, GFP_KERNEL);
	if (!ascebc) {
		kfree(rp);
		return ERR_PTR(-ENOMEM);
	}
	rc = raw3270_setup_device(cdev, rp, ascebc);
	if (rc) {
		kfree(rp->ascebc);
		kfree(rp);
		rp = ERR_PTR(rc);
	}
	/* Get reference to ccw_device structure. */
	get_device(&cdev->dev);
	return rp;
}

/*
 * Activate a view.
 */
int
raw3270_activate_view(struct raw3270_view *view)
{
	struct raw3270 *rp;
	struct raw3270_view *oldview, *nv;
	unsigned long flags;
	int rc;

	rp = view->dev;
	if (!rp)
		return -ENODEV;
	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
	if (rp->view == view)
		rc = 0;
	else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
		rc = -ENODEV;
	else if (test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
		rc = -EACCES;
	else {
		oldview = NULL;
		if (rp->view) {
			oldview = rp->view;
			oldview->fn->deactivate(oldview);
		}
		rp->view = view;
		rc = view->fn->activate(view);
		if (rc) {
			/* Didn't work. Try to reactivate the old view. */
			rp->view = oldview;
			if (!oldview || oldview->fn->activate(oldview) != 0) {
				/* Didn't work as well. Try any other view. */
				list_for_each_entry(nv, &rp->view_list, list)
					if (nv != view && nv != oldview) {
						rp->view = nv;
						if (nv->fn->activate(nv) == 0)
							break;
						rp->view = NULL;
					}
			}
		}
	}
	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
	return rc;
}

/*
 * Deactivate current view.
 */
void
raw3270_deactivate_view(struct raw3270_view *view)
{
	unsigned long flags;
	struct raw3270 *rp;

	rp = view->dev;
	if (!rp)
		return;
	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
	if (rp->view == view) {
		view->fn->deactivate(view);
		rp->view = NULL;
		/* Move deactivated view to end of list. */
		list_del_init(&view->list);
		list_add_tail(&view->list, &rp->view_list);
		/* Try to activate another view. */
		if (test_bit(RAW3270_FLAGS_READY, &rp->flags) &&
		    !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
			list_for_each_entry(view, &rp->view_list, list) {
				rp->view = view;
				if (view->fn->activate(view) == 0)
					break;
				rp->view = NULL;
			}
		}
	}
	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
}

/*
 * Add view to device with minor "minor".
 */
int
raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor)
{
	unsigned long flags;
	struct raw3270 *rp;
	int rc;

	if (minor <= 0)
		return -ENODEV;
	mutex_lock(&raw3270_mutex);
	rc = -ENODEV;
	list_for_each_entry(rp, &raw3270_devices, list) {
		if (rp->minor != minor)
			continue;
		spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
		if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
			atomic_set(&view->ref_count, 2);
			view->dev = rp;
			view->fn = fn;
			view->model = rp->model;
			view->rows = rp->rows;
			view->cols = rp->cols;
			view->ascebc = rp->ascebc;
			spin_lock_init(&view->lock);
			list_add(&view->list, &rp->view_list);
			rc = 0;
		}
		spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
		break;
	}
	mutex_unlock(&raw3270_mutex);
	return rc;
}

/*
 * Find specific view of device with minor "minor".
 */
struct raw3270_view *
raw3270_find_view(struct raw3270_fn *fn, int minor)
{
	struct raw3270 *rp;
	struct raw3270_view *view, *tmp;
	unsigned long flags;

	mutex_lock(&raw3270_mutex);
	view = ERR_PTR(-ENODEV);
	list_for_each_entry(rp, &raw3270_devices, list) {
		if (rp->minor != minor)
			continue;
		spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
		if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
			view = ERR_PTR(-ENOENT);
			list_for_each_entry(tmp, &rp->view_list, list) {
				if (tmp->fn == fn) {
					raw3270_get_view(tmp);
					view = tmp;
					break;
				}
			}
		}
		spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
		break;
	}
	mutex_unlock(&raw3270_mutex);
	return view;
}

/*
 * Remove view from device and free view structure via call to view->fn->free.
 */
void
raw3270_del_view(struct raw3270_view *view)
{
	unsigned long flags;
	struct raw3270 *rp;
	struct raw3270_view *nv;

	rp = view->dev;
	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
	if (rp->view == view) {
		view->fn->deactivate(view);
		rp->view = NULL;
	}
	list_del_init(&view->list);
	if (!rp->view && test_bit(RAW3270_FLAGS_READY, &rp->flags) &&
	    !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
		/* Try to activate another view. */
		list_for_each_entry(nv, &rp->view_list, list) {
			if (nv->fn->activate(nv) == 0) {
				rp->view = nv;
				break;
			}
		}
	}
	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
	/* Wait for reference counter to drop to zero. */
	atomic_dec(&view->ref_count);
	wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0);
	if (view->fn->free)
		view->fn->free(view);
}

/*
 * Remove a 3270 device structure.
 */
static void
raw3270_delete_device(struct raw3270 *rp)
{
	struct ccw_device *cdev;

	/* Remove from device chain. */
	mutex_lock(&raw3270_mutex);
	if (rp->clttydev && !IS_ERR(rp->clttydev))
		device_destroy(class3270, MKDEV(IBM_TTY3270_MAJOR, rp->minor));
	if (rp->cltubdev && !IS_ERR(rp->cltubdev))
		device_destroy(class3270, MKDEV(IBM_FS3270_MAJOR, rp->minor));
	list_del_init(&rp->list);
	mutex_unlock(&raw3270_mutex);

	/* Disconnect from ccw_device. */
	cdev = rp->cdev;
	rp->cdev = NULL;
	dev_set_drvdata(&cdev->dev, NULL);
	cdev->handler = NULL;

	/* Put ccw_device structure. */
	put_device(&cdev->dev);

	/* Now free raw3270 structure. */
	kfree(rp->ascebc);
	kfree(rp);
}

static int
raw3270_probe (struct ccw_device *cdev)
{
	return 0;
}

/*
 * Additional attributes for a 3270 device
 */
static ssize_t
raw3270_model_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%i\n",
			((struct raw3270 *) dev_get_drvdata(dev))->model);
}
static DEVICE_ATTR(model, 0444, raw3270_model_show, NULL);

static ssize_t
raw3270_rows_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%i\n",
			((struct raw3270 *) dev_get_drvdata(dev))->rows);
}
static DEVICE_ATTR(rows, 0444, raw3270_rows_show, NULL);

static ssize_t
raw3270_columns_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%i\n",
			((struct raw3270 *) dev_get_drvdata(dev))->cols);
}
static DEVICE_ATTR(columns, 0444, raw3270_columns_show, NULL);

static struct attribute * raw3270_attrs[] = {
	&dev_attr_model.attr,
	&dev_attr_rows.attr,
	&dev_attr_columns.attr,
	NULL,
};

static struct attribute_group raw3270_attr_group = {
	.attrs = raw3270_attrs,
};

static int raw3270_create_attributes(struct raw3270 *rp)
{
	int rc;

	rc = sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
	if (rc)
		goto out;

	rp->clttydev = device_create(class3270, &rp->cdev->dev,
				     MKDEV(IBM_TTY3270_MAJOR, rp->minor), NULL,
				     "tty%s", dev_name(&rp->cdev->dev));
	if (IS_ERR(rp->clttydev)) {
		rc = PTR_ERR(rp->clttydev);
		goto out_ttydev;
	}

	rp->cltubdev = device_create(class3270, &rp->cdev->dev,
				     MKDEV(IBM_FS3270_MAJOR, rp->minor), NULL,
				     "tub%s", dev_name(&rp->cdev->dev));
	if (!IS_ERR(rp->cltubdev))
		goto out;

	rc = PTR_ERR(rp->cltubdev);
	device_destroy(class3270, MKDEV(IBM_TTY3270_MAJOR, rp->minor));

out_ttydev:
	sysfs_remove_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
out:
	return rc;
}

/*
 * Notifier for device addition/removal
 */
struct raw3270_notifier {
	struct list_head list;
	void (*notifier)(int, int);
};

static LIST_HEAD(raw3270_notifier);

int raw3270_register_notifier(void (*notifier)(int, int))
{
	struct raw3270_notifier *np;
	struct raw3270 *rp;

	np = kmalloc(sizeof(struct raw3270_notifier), GFP_KERNEL);
	if (!np)
		return -ENOMEM;
	np->notifier = notifier;
	mutex_lock(&raw3270_mutex);
	list_add_tail(&np->list, &raw3270_notifier);
	list_for_each_entry(rp, &raw3270_devices, list) {
		get_device(&rp->cdev->dev);
		notifier(rp->minor, 1);
	}
	mutex_unlock(&raw3270_mutex);
	return 0;
}

void raw3270_unregister_notifier(void (*notifier)(int, int))
{
	struct raw3270_notifier *np;

	mutex_lock(&raw3270_mutex);
	list_for_each_entry(np, &raw3270_notifier, list)
		if (np->notifier == notifier) {
			list_del(&np->list);
			kfree(np);
			break;
		}
	mutex_unlock(&raw3270_mutex);
}

/*
 * Set 3270 device online.
 */
static int
raw3270_set_online (struct ccw_device *cdev)
{
	struct raw3270 *rp;
	struct raw3270_notifier *np;
	int rc;

	rp = raw3270_create_device(cdev);
	if (IS_ERR(rp))
		return PTR_ERR(rp);
	rc = raw3270_reset_device(rp);
	if (rc)
		goto failure;
	rc = raw3270_size_device(rp);
	if (rc)
		goto failure;
	rc = raw3270_reset_device(rp);
	if (rc)
		goto failure;
	rc = raw3270_create_attributes(rp);
	if (rc)
		goto failure;
	set_bit(RAW3270_FLAGS_READY, &rp->flags);
	mutex_lock(&raw3270_mutex);
	list_for_each_entry(np, &raw3270_notifier, list)
		np->notifier(rp->minor, 1);
	mutex_unlock(&raw3270_mutex);
	return 0;

failure:
	raw3270_delete_device(rp);
	return rc;
}

/*
 * Remove 3270 device structure.
 */
static void
raw3270_remove (struct ccw_device *cdev)
{
	unsigned long flags;
	struct raw3270 *rp;
	struct raw3270_view *v;
	struct raw3270_notifier *np;

	rp = dev_get_drvdata(&cdev->dev);
	/*
	 * _remove is the opposite of _probe; it's probe that
	 * should set up rp.  raw3270_remove gets entered for
	 * devices even if they haven't been varied online.
	 * Thus, rp may validly be NULL here.
	 */
	if (rp == NULL)
		return;
	clear_bit(RAW3270_FLAGS_READY, &rp->flags);

	sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group);

	/* Deactivate current view and remove all views. */
	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
	if (rp->view) {
		rp->view->fn->deactivate(rp->view);
		rp->view = NULL;
	}
	while (!list_empty(&rp->view_list)) {
		v = list_entry(rp->view_list.next, struct raw3270_view, list);
		if (v->fn->release)
			v->fn->release(v);
		spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
		raw3270_del_view(v);
		spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
	}
	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);

	mutex_lock(&raw3270_mutex);
	list_for_each_entry(np, &raw3270_notifier, list)
		np->notifier(rp->minor, 0);
	mutex_unlock(&raw3270_mutex);

	/* Reset 3270 device. */
	raw3270_reset_device(rp);
	/* And finally remove it. */
	raw3270_delete_device(rp);
}

/*
 * Set 3270 device offline.
 */
static int
raw3270_set_offline (struct ccw_device *cdev)
{
	struct raw3270 *rp;

	rp = dev_get_drvdata(&cdev->dev);
	if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags))
		return -EBUSY;
	raw3270_remove(cdev);
	return 0;
}

static int raw3270_pm_stop(struct ccw_device *cdev)
{
	struct raw3270 *rp;
	struct raw3270_view *view;
	unsigned long flags;

	rp = dev_get_drvdata(&cdev->dev);
	if (!rp)
		return 0;
	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
	if (rp->view)
		rp->view->fn->deactivate(rp->view);
	if (!test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags)) {
		/*
		 * Release tty and fullscreen for all non-console
		 * devices.
		 */
		list_for_each_entry(view, &rp->view_list, list) {
			if (view->fn->release)
				view->fn->release(view);
		}
	}
	set_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
	return 0;
}

static int raw3270_pm_start(struct ccw_device *cdev)
{
	struct raw3270 *rp;
	unsigned long flags;

	rp = dev_get_drvdata(&cdev->dev);
	if (!rp)
		return 0;
	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
	clear_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
	if (rp->view)
		rp->view->fn->activate(rp->view);
	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
	return 0;
}

void raw3270_pm_unfreeze(struct raw3270_view *view)
{
#ifdef CONFIG_TN3270_CONSOLE
	struct raw3270 *rp;

	rp = view->dev;
	if (rp && test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
		ccw_device_force_console();
#endif
}

static struct ccw_device_id raw3270_id[] = {
	{ CCW_DEVICE(0x3270, 0) },
	{ CCW_DEVICE(0x3271, 0) },
	{ CCW_DEVICE(0x3272, 0) },
	{ CCW_DEVICE(0x3273, 0) },
	{ CCW_DEVICE(0x3274, 0) },
	{ CCW_DEVICE(0x3275, 0) },
	{ CCW_DEVICE(0x3276, 0) },
	{ CCW_DEVICE(0x3277, 0) },
	{ CCW_DEVICE(0x3278, 0) },
	{ CCW_DEVICE(0x3279, 0) },
	{ CCW_DEVICE(0x3174, 0) },
	{ /* end of list */ },
};

static struct ccw_driver raw3270_ccw_driver = {
	.driver = {
		.name	= "3270",
		.owner	= THIS_MODULE,
	},
	.ids		= raw3270_id,
	.probe		= &raw3270_probe,
	.remove		= &raw3270_remove,
	.set_online	= &raw3270_set_online,
	.set_offline	= &raw3270_set_offline,
	.freeze		= &raw3270_pm_stop,
	.thaw		= &raw3270_pm_start,
	.restore	= &raw3270_pm_start,
};

static int
raw3270_init(void)
{
	struct raw3270 *rp;
	int rc;

	if (raw3270_registered)
		return 0;
	raw3270_registered = 1;
	rc = ccw_driver_register(&raw3270_ccw_driver);
	if (rc == 0) {
		/* Create attributes for early (= console) device. */
		mutex_lock(&raw3270_mutex);
		class3270 = class_create(THIS_MODULE, "3270");
		list_for_each_entry(rp, &raw3270_devices, list) {
			get_device(&rp->cdev->dev);
			raw3270_create_attributes(rp);
		}
		mutex_unlock(&raw3270_mutex);
	}
	return rc;
}

static void
raw3270_exit(void)
{
	ccw_driver_unregister(&raw3270_ccw_driver);
	class_destroy(class3270);
}

MODULE_LICENSE("GPL");

module_init(raw3270_init);
module_exit(raw3270_exit);

EXPORT_SYMBOL(raw3270_request_alloc);
EXPORT_SYMBOL(raw3270_request_free);
EXPORT_SYMBOL(raw3270_request_reset);
EXPORT_SYMBOL(raw3270_request_set_cmd);
EXPORT_SYMBOL(raw3270_request_add_data);
EXPORT_SYMBOL(raw3270_request_set_data);
EXPORT_SYMBOL(raw3270_request_set_idal);
EXPORT_SYMBOL(raw3270_buffer_address);
EXPORT_SYMBOL(raw3270_add_view);
EXPORT_SYMBOL(raw3270_del_view);
EXPORT_SYMBOL(raw3270_find_view);
EXPORT_SYMBOL(raw3270_activate_view);
EXPORT_SYMBOL(raw3270_deactivate_view);
EXPORT_SYMBOL(raw3270_start);
EXPORT_SYMBOL(raw3270_start_locked);
EXPORT_SYMBOL(raw3270_start_irq);
EXPORT_SYMBOL(raw3270_reset);
EXPORT_SYMBOL(raw3270_register_notifier);
EXPORT_SYMBOL(raw3270_unregister_notifier);
EXPORT_SYMBOL(raw3270_wait_queue);