aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mfd/ab3550-core.c
blob: 1060f8e1c40a1cd0c280b2dbfcb3759fd932241e (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
/*
 * Copyright (C) 2007-2010 ST-Ericsson
 * License terms: GNU General Public License (GPL) version 2
 * Low-level core for exclusive access to the AB3550 IC on the I2C bus
 * and some basic chip-configuration.
 * Author: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
 * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com>
 * Author: Mattias Wallin <mattias.wallin@stericsson.com>
 * Author: Rickard Andersson <rickard.andersson@stericsson.com>
 */

#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/random.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/mfd/abx500.h>
#include <linux/list.h>
#include <linux/bitops.h>
#include <linux/spinlock.h>
#include <linux/mfd/core.h>

#define AB3550_NAME_STRING "ab3550"
#define AB3550_ID_FORMAT_STRING "AB3550 %s"
#define AB3550_NUM_BANKS 2
#define AB3550_NUM_EVENT_REG 5

/* These are the only registers inside AB3550 used in this main file */

/* Chip ID register */
#define AB3550_CID_REG           0x20

/* Interrupt event registers */
#define AB3550_EVENT_BANK        0
#define AB3550_EVENT_REG         0x22

/* Read/write operation values. */
#define AB3550_PERM_RD (0x01)
#define AB3550_PERM_WR (0x02)

/* Read/write permissions. */
#define AB3550_PERM_RO (AB3550_PERM_RD)
#define AB3550_PERM_RW (AB3550_PERM_RD | AB3550_PERM_WR)

/**
 * struct ab3550
 * @access_mutex: lock out concurrent accesses to the AB registers
 * @i2c_client: I2C client for this chip
 * @chip_name: name of this chip variant
 * @chip_id: 8 bit chip ID for this chip variant
 * @mask_work: a worker for writing to mask registers
 * @event_lock: a lock to protect the event_mask
 * @event_mask: a local copy of the mask event registers
 * @startup_events: a copy of the first reading of the event registers
 * @startup_events_read: whether the first events have been read
 */
struct ab3550 {
	struct mutex access_mutex;
	struct i2c_client *i2c_client[AB3550_NUM_BANKS];
	char chip_name[32];
	u8 chip_id;
	struct work_struct mask_work;
	spinlock_t event_lock;
	u8 event_mask[AB3550_NUM_EVENT_REG];
	u8 startup_events[AB3550_NUM_EVENT_REG];
	bool startup_events_read;
#ifdef CONFIG_DEBUG_FS
	unsigned int debug_bank;
	unsigned int debug_address;
#endif
};

/**
 * struct ab3550_reg_range
 * @first: the first address of the range
 * @last: the last address of the range
 * @perm: access permissions for the range
 */
struct ab3550_reg_range {
	u8 first;
	u8 last;
	u8 perm;
};

/**
 * struct ab3550_reg_ranges
 * @count: the number of ranges in the list
 * @range: the list of register ranges
 */
struct ab3550_reg_ranges {
	u8 count;
	const struct ab3550_reg_range *range;
};

/*
 * Permissible register ranges for reading and writing per device and bank.
 *
 * The ranges must be listed in increasing address order, and no overlaps are
 * allowed. It is assumed that write permission implies read permission
 * (i.e. only RO and RW permissions should be used).  Ranges with write
 * permission must not be split up.
 */

#define NO_RANGE {.count = 0, .range = NULL,}

static struct
ab3550_reg_ranges ab3550_reg_ranges[AB3550_NUM_DEVICES][AB3550_NUM_BANKS] = {
	[AB3550_DEVID_DAC] = {
		NO_RANGE,
		{
			.count = 2,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0xb0,
					.last = 0xba,
					.perm = AB3550_PERM_RW,
				},
				{
					.first = 0xbc,
					.last = 0xc3,
					.perm = AB3550_PERM_RW,
				},
			},
		},
	},
	[AB3550_DEVID_LEDS] = {
		NO_RANGE,
		{
			.count = 2,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0x5a,
					.last = 0x88,
					.perm = AB3550_PERM_RW,
				},
				{
					.first = 0x8a,
					.last = 0xad,
					.perm = AB3550_PERM_RW,
				},
			}
		},
	},
	[AB3550_DEVID_POWER] = {
		{
			.count = 1,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0x21,
					.last = 0x21,
					.perm = AB3550_PERM_RO,
				},
			}
		},
		NO_RANGE,
	},
	[AB3550_DEVID_REGULATORS] = {
		{
			.count = 1,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0x69,
					.last = 0xa3,
					.perm = AB3550_PERM_RW,
				},
			}
		},
		{
			.count = 1,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0x14,
					.last = 0x16,
					.perm = AB3550_PERM_RW,
				},
			}
		},
	},
	[AB3550_DEVID_SIM] = {
		{
			.count = 1,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0x21,
					.last = 0x21,
					.perm = AB3550_PERM_RO,
				},
			}
		},
		{
			.count = 1,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0x14,
					.last = 0x17,
					.perm = AB3550_PERM_RW,
				},
			}

		},
	},
	[AB3550_DEVID_UART] = {
		NO_RANGE,
		NO_RANGE,
	},
	[AB3550_DEVID_RTC] = {
		{
			.count = 1,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0x00,
					.last = 0x0c,
					.perm = AB3550_PERM_RW,
				},
			}
		},
		NO_RANGE,
	},
	[AB3550_DEVID_CHARGER] = {
		{
			.count = 2,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0x10,
					.last = 0x1a,
					.perm = AB3550_PERM_RW,
				},
				{
					.first = 0x21,
					.last = 0x21,
					.perm = AB3550_PERM_RO,
				},
			}
		},
		NO_RANGE,
	},
	[AB3550_DEVID_ADC] = {
		NO_RANGE,
		{
			.count = 1,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0x20,
					.last = 0x56,
					.perm = AB3550_PERM_RW,
				},

			}
		},
	},
	[AB3550_DEVID_FUELGAUGE] = {
		{
			.count = 1,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0x21,
					.last = 0x21,
					.perm = AB3550_PERM_RO,
				},
			}
		},
		{
			.count = 1,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0x00,
					.last = 0x0e,
					.perm = AB3550_PERM_RW,
				},
			}
		},
	},
	[AB3550_DEVID_VIBRATOR] = {
		NO_RANGE,
		{
			.count = 1,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0x10,
					.last = 0x13,
					.perm = AB3550_PERM_RW,
				},

			}
		},
	},
	[AB3550_DEVID_CODEC] = {
		{
			.count = 2,
			.range = (struct ab3550_reg_range[]) {
				{
					.first = 0x31,
					.last = 0x63,
					.perm = AB3550_PERM_RW,
				},
				{
					.first = 0x65,
					.last = 0x68,
					.perm = AB3550_PERM_RW,
				},
			}
		},
		NO_RANGE,
	},
};

static struct mfd_cell ab3550_devs[AB3550_NUM_DEVICES] = {
	[AB3550_DEVID_DAC] = {
		.name = "ab3550-dac",
		.id = AB3550_DEVID_DAC,
		.num_resources = 0,
	},
	[AB3550_DEVID_LEDS] = {
		.name = "ab3550-leds",
		.id = AB3550_DEVID_LEDS,
	},
	[AB3550_DEVID_POWER] = {
		.name = "ab3550-power",
		.id = AB3550_DEVID_POWER,
	},
	[AB3550_DEVID_REGULATORS] = {
		.name = "ab3550-regulators",
		.id = AB3550_DEVID_REGULATORS,
	},
	[AB3550_DEVID_SIM] = {
		.name = "ab3550-sim",
		.id = AB3550_DEVID_SIM,
	},
	[AB3550_DEVID_UART] = {
		.name = "ab3550-uart",
		.id = AB3550_DEVID_UART,
	},
	[AB3550_DEVID_RTC] = {
		.name = "ab3550-rtc",
		.id = AB3550_DEVID_RTC,
	},
	[AB3550_DEVID_CHARGER] = {
		.name = "ab3550-charger",
		.id = AB3550_DEVID_CHARGER,
	},
	[AB3550_DEVID_ADC] = {
		.name = "ab3550-adc",
		.id = AB3550_DEVID_ADC,
		.num_resources = 10,
		.resources = (struct resource[]) {
			{
				.name = "TRIGGER-0",
				.flags = IORESOURCE_IRQ,
				.start = 16,
				.end = 16,
			},
			{
				.name = "TRIGGER-1",
				.flags = IORESOURCE_IRQ,
				.start = 17,
				.end = 17,
			},
			{
				.name = "TRIGGER-2",
				.flags = IORESOURCE_IRQ,
				.start = 18,
				.end = 18,
			},
			{
				.name = "TRIGGER-3",
				.flags = IORESOURCE_IRQ,
				.start = 19,
				.end = 19,
			},
			{
				.name = "TRIGGER-4",
				.flags = IORESOURCE_IRQ,
				.start = 20,
				.end = 20,
			},
			{
				.name = "TRIGGER-5",
				.flags = IORESOURCE_IRQ,
				.start = 21,
				.end = 21,
			},
			{
				.name = "TRIGGER-6",
				.flags = IORESOURCE_IRQ,
				.start = 22,
				.end = 22,
			},
			{
				.name = "TRIGGER-7",
				.flags = IORESOURCE_IRQ,
				.start = 23,
				.end = 23,
			},
			{
				.name = "TRIGGER-VBAT-TXON",
				.flags = IORESOURCE_IRQ,
				.start = 13,
				.end = 13,
			},
			{
				.name = "TRIGGER-VBAT",
				.flags = IORESOURCE_IRQ,
				.start = 12,
				.end = 12,
			},
		},
	},
	[AB3550_DEVID_FUELGAUGE] = {
		.name = "ab3550-fuelgauge",
		.id = AB3550_DEVID_FUELGAUGE,
	},
	[AB3550_DEVID_VIBRATOR] = {
		.name = "ab3550-vibrator",
		.id = AB3550_DEVID_VIBRATOR,
	},
	[AB3550_DEVID_CODEC] = {
		.name = "ab3550-codec",
		.id = AB3550_DEVID_CODEC,
	},
};

/*
 * I2C transactions with error messages.
 */
static int ab3550_i2c_master_send(struct ab3550 *ab, u8 bank, u8 *data,
	u8 count)
{
	int err;

	err = i2c_master_send(ab->i2c_client[bank], data, count);
	if (err < 0) {
		dev_err(&ab->i2c_client[0]->dev, "send error: %d\n", err);
		return err;
	}
	return 0;
}

static int ab3550_i2c_master_recv(struct ab3550 *ab, u8 bank, u8 *data,
	u8 count)
{
	int err;

	err = i2c_master_recv(ab->i2c_client[bank], data, count);
	if (err < 0) {
		dev_err(&ab->i2c_client[0]->dev, "receive error: %d\n", err);
		return err;
	}
	return 0;
}

/*
 * Functionality for getting/setting register values.
 */
static int get_register_interruptible(struct ab3550 *ab, u8 bank, u8 reg,
	u8 *value)
{
	int err;

	err = mutex_lock_interruptible(&ab->access_mutex);
	if (err)
		return err;

	err = ab3550_i2c_master_send(ab, bank, &reg, 1);
	if (!err)
		err = ab3550_i2c_master_recv(ab, bank, value, 1);

	mutex_unlock(&ab->access_mutex);
	return err;
}

static int get_register_page_interruptible(struct ab3550 *ab, u8 bank,
	u8 first_reg, u8 *regvals, u8 numregs)
{
	int err;

	err = mutex_lock_interruptible(&ab->access_mutex);
	if (err)
		return err;

	err = ab3550_i2c_master_send(ab, bank, &first_reg, 1);
	if (!err)
		err = ab3550_i2c_master_recv(ab, bank, regvals, numregs);

	mutex_unlock(&ab->access_mutex);
	return err;
}

static int mask_and_set_register_interruptible(struct ab3550 *ab, u8 bank,
	u8 reg, u8 bitmask, u8 bitvalues)
{
	int err = 0;

	if (likely(bitmask)) {
		u8 reg_bits[2] = {reg, 0};

		err = mutex_lock_interruptible(&ab->access_mutex);
		if (err)
			return err;

		if (bitmask == 0xFF) /* No need to read in this case. */
			reg_bits[1] = bitvalues;
		else { /* Read and modify the register value. */
			u8 bits;

			err = ab3550_i2c_master_send(ab, bank, &reg, 1);
			if (err)
				goto unlock_and_return;
			err = ab3550_i2c_master_recv(ab, bank, &bits, 1);
			if (err)
				goto unlock_and_return;
			reg_bits[1] = ((~bitmask & bits) |
				(bitmask & bitvalues));
		}
		/* Write the new value. */
		err = ab3550_i2c_master_send(ab, bank, reg_bits, 2);
unlock_and_return:
		mutex_unlock(&ab->access_mutex);
	}
	return err;
}

/*
 * Read/write permission checking functions.
 */
static bool page_write_allowed(const struct ab3550_reg_ranges *ranges,
	u8 first_reg, u8 last_reg)
{
	u8 i;

	if (last_reg < first_reg)
		return false;

	for (i = 0; i < ranges->count; i++) {
		if (first_reg < ranges->range[i].first)
			break;
		if ((last_reg <= ranges->range[i].last) &&
			(ranges->range[i].perm & AB3550_PERM_WR))
			return true;
	}
	return false;
}

static bool reg_write_allowed(const struct ab3550_reg_ranges *ranges, u8 reg)
{
	return page_write_allowed(ranges, reg, reg);
}

static bool page_read_allowed(const struct ab3550_reg_ranges *ranges,
	u8 first_reg, u8 last_reg)
{
	u8 i;

	if (last_reg < first_reg)
		return false;
	/* Find the range (if it exists in the list) that includes first_reg. */
	for (i = 0; i < ranges->count; i++) {
		if (first_reg < ranges->range[i].first)
			return false;
		if (first_reg <= ranges->range[i].last)
			break;
	}
	/* Make sure that the entire range up to and including last_reg is
	 * readable. This may span several of the ranges in the list.
	 */
	while ((i < ranges->count) &&
		(ranges->range[i].perm & AB3550_PERM_RD)) {
		if (last_reg <= ranges->range[i].last)
			return true;
		if ((++i >= ranges->count) ||
			(ranges->range[i].first !=
			 (ranges->range[i - 1].last + 1))) {
			break;
		}
	}
	return false;
}

static bool reg_read_allowed(const struct ab3550_reg_ranges *ranges, u8 reg)
{
	return page_read_allowed(ranges, reg, reg);
}

/*
 * The exported register access functionality.
 */
int ab3550_get_chip_id(struct device *dev)
{
	struct ab3550 *ab = dev_get_drvdata(dev->parent);
	return (int)ab->chip_id;
}

int ab3550_mask_and_set_register_interruptible(struct device *dev, u8 bank,
	u8 reg, u8 bitmask, u8 bitvalues)
{
	struct ab3550 *ab;
	struct platform_device *pdev = to_platform_device(dev);

	if ((AB3550_NUM_BANKS <= bank) ||
		!reg_write_allowed(&ab3550_reg_ranges[pdev->id][bank], reg))
		return -EINVAL;

	ab = dev_get_drvdata(dev->parent);
	return mask_and_set_register_interruptible(ab, bank, reg,
		bitmask, bitvalues);
}

int ab3550_set_register_interruptible(struct device *dev, u8 bank, u8 reg,
	u8 value)
{
	return ab3550_mask_and_set_register_interruptible(dev, bank, reg, 0xFF,
		value);
}

int ab3550_get_register_interruptible(struct device *dev, u8 bank, u8 reg,
	u8 *value)
{
	struct ab3550 *ab;
	struct platform_device *pdev = to_platform_device(dev);

	if ((AB3550_NUM_BANKS <= bank) ||
		!reg_read_allowed(&ab3550_reg_ranges[pdev->id][bank], reg))
		return -EINVAL;

	ab = dev_get_drvdata(dev->parent);
	return get_register_interruptible(ab, bank, reg, value);
}

int ab3550_get_register_page_interruptible(struct device *dev, u8 bank,
	u8 first_reg, u8 *regvals, u8 numregs)
{
	struct ab3550 *ab;
	struct platform_device *pdev = to_platform_device(dev);

	if ((AB3550_NUM_BANKS <= bank) ||
		!page_read_allowed(&ab3550_reg_ranges[pdev->id][bank],
			first_reg, (first_reg + numregs - 1)))
		return -EINVAL;

	ab = dev_get_drvdata(dev->parent);
	return get_register_page_interruptible(ab, bank, first_reg, regvals,
		numregs);
}

int ab3550_event_registers_startup_state_get(struct device *dev, u8 *event)
{
	struct ab3550 *ab;

	ab = dev_get_drvdata(dev->parent);
	if (!ab->startup_events_read)
		return -EAGAIN; /* Try again later */

	memcpy(event, ab->startup_events, AB3550_NUM_EVENT_REG);
	return 0;
}

int ab3550_startup_irq_enabled(struct device *dev, unsigned int irq)
{
	struct ab3550 *ab;
	struct ab3550_platform_data *plf_data;
	bool val;

	ab = get_irq_chip_data(irq);
	plf_data = ab->i2c_client[0]->dev.platform_data;
	irq -= plf_data->irq.base;
	val = ((ab->startup_events[irq / 8] & BIT(irq % 8)) != 0);

	return val;
}

static struct abx500_ops ab3550_ops = {
	.get_chip_id = ab3550_get_chip_id,
	.get_register = ab3550_get_register_interruptible,
	.set_register = ab3550_set_register_interruptible,
	.get_register_page = ab3550_get_register_page_interruptible,
	.set_register_page = NULL,
	.mask_and_set_register = ab3550_mask_and_set_register_interruptible,
	.event_registers_startup_state_get =
		ab3550_event_registers_startup_state_get,
	.startup_irq_enabled = ab3550_startup_irq_enabled,
};

static irqreturn_t ab3550_irq_handler(int irq, void *data)
{
	struct ab3550 *ab = data;
	int err;
	unsigned int i;
	u8 e[AB3550_NUM_EVENT_REG];
	u8 *events;
	unsigned long flags;

	events = (ab->startup_events_read ? e : ab->startup_events);

	err = get_register_page_interruptible(ab, AB3550_EVENT_BANK,
		AB3550_EVENT_REG, events, AB3550_NUM_EVENT_REG);
	if (err)
		goto err_event_rd;

	if (!ab->startup_events_read) {
		dev_info(&ab->i2c_client[0]->dev,
			"startup events 0x%x,0x%x,0x%x,0x%x,0x%x\n",
			ab->startup_events[0], ab->startup_events[1],
			ab->startup_events[2], ab->startup_events[3],
			ab->startup_events[4]);
		ab->startup_events_read = true;
		goto out;
	}

	/* The two highest bits in event[4] are not used. */
	events[4] &= 0x3f;

	spin_lock_irqsave(&ab->event_lock, flags);
	for (i = 0; i < AB3550_NUM_EVENT_REG; i++)
		events[i] &= ~ab->event_mask[i];
	spin_unlock_irqrestore(&ab->event_lock, flags);

	for (i = 0; i < AB3550_NUM_EVENT_REG; i++) {
		u8 bit;
		u8 event_reg;

		dev_dbg(&ab->i2c_client[0]->dev, "IRQ Event[%d]: 0x%2x\n",
			i, events[i]);

		event_reg = events[i];
		for (bit = 0; event_reg; bit++, event_reg /= 2) {
			if (event_reg % 2) {
				unsigned int irq;
				struct ab3550_platform_data *plf_data;

				plf_data = ab->i2c_client[0]->dev.platform_data;
				irq = plf_data->irq.base + (i * 8) + bit;
				handle_nested_irq(irq);
			}
		}
	}
out:
	return IRQ_HANDLED;

err_event_rd:
	dev_dbg(&ab->i2c_client[0]->dev, "error reading event registers\n");
	return IRQ_HANDLED;
}

#ifdef CONFIG_DEBUG_FS
static struct ab3550_reg_ranges debug_ranges[AB3550_NUM_BANKS] = {
	{
		.count = 6,
		.range = (struct ab3550_reg_range[]) {
			{
				.first = 0x00,
				.last = 0x0e,
			},
			{
				.first = 0x10,
				.last = 0x1a,
			},
			{
				.first = 0x1e,
				.last = 0x4f,
			},
			{
				.first = 0x51,
				.last = 0x63,
			},
			{
				.first = 0x65,
				.last = 0xa3,
			},
			{
				.first = 0xa5,
				.last = 0xa8,
			},
		}
	},
	{
		.count = 8,
		.range = (struct ab3550_reg_range[]) {
			{
				.first = 0x00,
				.last = 0x0e,
			},
			{
				.first = 0x10,
				.last = 0x17,
			},
			{
				.first = 0x1a,
				.last = 0x1c,
			},
			{
				.first = 0x20,
				.last = 0x56,
			},
			{
				.first = 0x5a,
				.last = 0x88,
			},
			{
				.first = 0x8a,
				.last = 0xad,
			},
			{
				.first = 0xb0,
				.last = 0xba,
			},
			{
				.first = 0xbc,
				.last = 0xc3,
			},
		}
	},
};

static int ab3550_registers_print(struct seq_file *s, void *p)
{
	struct ab3550 *ab = s->private;
	int bank;

	seq_printf(s, AB3550_NAME_STRING " register values:\n");

	for (bank = 0; bank < AB3550_NUM_BANKS; bank++) {
		unsigned int i;

		seq_printf(s, " bank %d:\n", bank);
		for (i = 0; i < debug_ranges[bank].count; i++) {
			u8 reg;

			for (reg = debug_ranges[bank].range[i].first;
				reg <= debug_ranges[bank].range[i].last;
				reg++) {
				u8 value;

				get_register_interruptible(ab, bank, reg,
					&value);
				seq_printf(s, "  [%d/0x%02X]: 0x%02X\n", bank,
					reg, value);
			}
		}
	}
	return 0;
}

static int ab3550_registers_open(struct inode *inode, struct file *file)
{
	return single_open(file, ab3550_registers_print, inode->i_private);
}

static const struct file_operations ab3550_registers_fops = {
	.open = ab3550_registers_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static int ab3550_bank_print(struct seq_file *s, void *p)
{
	struct ab3550 *ab = s->private;

	seq_printf(s, "%d\n", ab->debug_bank);
	return 0;
}

static int ab3550_bank_open(struct inode *inode, struct file *file)
{
	return single_open(file, ab3550_bank_print, inode->i_private);
}

static ssize_t ab3550_bank_write(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
{
	struct ab3550 *ab = ((struct seq_file *)(file->private_data))->private;
	char buf[32];
	int buf_size;
	unsigned long user_bank;
	int err;

	/* Get userspace string and assure termination */
	buf_size = min(count, (sizeof(buf) - 1));
	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;
	buf[buf_size] = 0;

	err = strict_strtoul(buf, 0, &user_bank);
	if (err)
		return -EINVAL;

	if (user_bank >= AB3550_NUM_BANKS) {
		dev_err(&ab->i2c_client[0]->dev,
			"debugfs error input > number of banks\n");
		return -EINVAL;
	}

	ab->debug_bank = user_bank;

	return buf_size;
}

static int ab3550_address_print(struct seq_file *s, void *p)
{
	struct ab3550 *ab = s->private;

	seq_printf(s, "0x%02X\n", ab->debug_address);
	return 0;
}

static int ab3550_address_open(struct inode *inode, struct file *file)
{
	return single_open(file, ab3550_address_print, inode->i_private);
}

static ssize_t ab3550_address_write(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
{
	struct ab3550 *ab = ((struct seq_file *)(file->private_data))->private;
	char buf[32];
	int buf_size;
	unsigned long user_address;
	int err;

	/* Get userspace string and assure termination */
	buf_size = min(count, (sizeof(buf) - 1));
	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;
	buf[buf_size] = 0;

	err = strict_strtoul(buf, 0, &user_address);
	if (err)
		return -EINVAL;
	if (user_address > 0xff) {
		dev_err(&ab->i2c_client[0]->dev,
			"debugfs error input > 0xff\n");
		return -EINVAL;
	}
	ab->debug_address = user_address;
	return buf_size;
}

static int ab3550_val_print(struct seq_file *s, void *p)
{
	struct ab3550 *ab = s->private;
	int err;
	u8 regvalue;

	err = get_register_interruptible(ab, (u8)ab->debug_bank,
		(u8)ab->debug_address, &regvalue);
	if (err)
		return -EINVAL;
	seq_printf(s, "0x%02X\n", regvalue);

	return 0;
}

static int ab3550_val_open(struct inode *inode, struct file *file)
{
	return single_open(file, ab3550_val_print, inode->i_private);
}

static ssize_t ab3550_val_write(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
{
	struct ab3550 *ab = ((struct seq_file *)(file->private_data))->private;
	char buf[32];
	int buf_size;
	unsigned long user_val;
	int err;
	u8 regvalue;

	/* Get userspace string and assure termination */
	buf_size = min(count, (sizeof(buf)-1));
	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;
	buf[buf_size] = 0;

	err = strict_strtoul(buf, 0, &user_val);
	if (err)
		return -EINVAL;
	if (user_val > 0xff) {
		dev_err(&ab->i2c_client[0]->dev,
			"debugfs error input > 0xff\n");
		return -EINVAL;
	}
	err = mask_and_set_register_interruptible(
		ab, (u8)ab->debug_bank,
		(u8)ab->debug_address, 0xFF, (u8)user_val);
	if (err)
		return -EINVAL;

	get_register_interruptible(ab, (u8)ab->debug_bank,
		(u8)ab->debug_address, &regvalue);
	if (err)
		return -EINVAL;

	return buf_size;
}

static const struct file_operations ab3550_bank_fops = {
	.open = ab3550_bank_open,
	.write = ab3550_bank_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static const struct file_operations ab3550_address_fops = {
	.open = ab3550_address_open,
	.write = ab3550_address_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static const struct file_operations ab3550_val_fops = {
	.open = ab3550_val_open,
	.write = ab3550_val_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static struct dentry *ab3550_dir;
static struct dentry *ab3550_reg_file;
static struct dentry *ab3550_bank_file;
static struct dentry *ab3550_address_file;
static struct dentry *ab3550_val_file;

static inline void ab3550_setup_debugfs(struct ab3550 *ab)
{
	ab->debug_bank = 0;
	ab->debug_address = 0x00;

	ab3550_dir = debugfs_create_dir(AB3550_NAME_STRING, NULL);
	if (!ab3550_dir)
		goto exit_no_debugfs;

	ab3550_reg_file = debugfs_create_file("all-registers",
		S_IRUGO, ab3550_dir, ab, &ab3550_registers_fops);
	if (!ab3550_reg_file)
		goto exit_destroy_dir;

	ab3550_bank_file = debugfs_create_file("register-bank",
		(S_IRUGO | S_IWUGO), ab3550_dir, ab, &ab3550_bank_fops);
	if (!ab3550_bank_file)
		goto exit_destroy_reg;

	ab3550_address_file = debugfs_create_file("register-address",
		(S_IRUGO | S_IWUGO), ab3550_dir, ab, &ab3550_address_fops);
	if (!ab3550_address_file)
		goto exit_destroy_bank;

	ab3550_val_file = debugfs_create_file("register-value",
		(S_IRUGO | S_IWUGO), ab3550_dir, ab, &ab3550_val_fops);
	if (!ab3550_val_file)
		goto exit_destroy_address;

	return;

exit_destroy_address:
	debugfs_remove(ab3550_address_file);
exit_destroy_bank:
	debugfs_remove(ab3550_bank_file);
exit_destroy_reg:
	debugfs_remove(ab3550_reg_file);
exit_destroy_dir:
	debugfs_remove(ab3550_dir);
exit_no_debugfs:
	dev_err(&ab->i2c_client[0]->dev, "failed to create debugfs entries.\n");
	return;
}

static inline void ab3550_remove_debugfs(void)
{
	debugfs_remove(ab3550_val_file);
	debugfs_remove(ab3550_address_file);
	debugfs_remove(ab3550_bank_file);
	debugfs_remove(ab3550_reg_file);
	debugfs_remove(ab3550_dir);
}

#else /* !CONFIG_DEBUG_FS */
static inline void ab3550_setup_debugfs(struct ab3550 *ab)
{
}
static inline void ab3550_remove_debugfs(void)
{
}
#endif

/*
 * Basic set-up, datastructure creation/destruction and I2C interface.
 * This sets up a default config in the AB3550 chip so that it
 * will work as expected.
 */
static int __init ab3550_setup(struct ab3550 *ab)
{
	int err = 0;
	int i;
	struct ab3550_platform_data *plf_data;
	struct abx500_init_settings *settings;

	plf_data = ab->i2c_client[0]->dev.platform_data;
	settings = plf_data->init_settings;

	for (i = 0; i < plf_data->init_settings_sz; i++) {
		err = mask_and_set_register_interruptible(ab,
			settings[i].bank,
			settings[i].reg,
			0xFF, settings[i].setting);
		if (err)
			goto exit_no_setup;

		/* If event mask register update the event mask in ab3550 */
		if ((settings[i].bank == 0) &&
			(AB3550_IMR1 <= settings[i].reg) &&
			(settings[i].reg <= AB3550_IMR5)) {
			ab->event_mask[settings[i].reg - AB3550_IMR1] =
				settings[i].setting;
		}
	}
exit_no_setup:
	return err;
}

static void ab3550_mask_work(struct work_struct *work)
{
	struct ab3550 *ab = container_of(work, struct ab3550, mask_work);
	int i;
	unsigned long flags;
	u8 mask[AB3550_NUM_EVENT_REG];

	spin_lock_irqsave(&ab->event_lock, flags);
	for (i = 0; i < AB3550_NUM_EVENT_REG; i++)
		mask[i] = ab->event_mask[i];
	spin_unlock_irqrestore(&ab->event_lock, flags);

	for (i = 0; i < AB3550_NUM_EVENT_REG; i++) {
		int err;

		err = mask_and_set_register_interruptible(ab, 0,
			(AB3550_IMR1 + i), ~0, mask[i]);
		if (err)
			dev_err(&ab->i2c_client[0]->dev,
				"ab3550_mask_work failed 0x%x,0x%x\n",
				(AB3550_IMR1 + i), mask[i]);
	}
}

static void ab3550_mask(unsigned int irq)
{
	unsigned long flags;
	struct ab3550 *ab;
	struct ab3550_platform_data *plf_data;

	ab = get_irq_chip_data(irq);
	plf_data = ab->i2c_client[0]->dev.platform_data;
	irq -= plf_data->irq.base;

	spin_lock_irqsave(&ab->event_lock, flags);
	ab->event_mask[irq / 8] |= BIT(irq % 8);
	spin_unlock_irqrestore(&ab->event_lock, flags);

	schedule_work(&ab->mask_work);
}

static void ab3550_unmask(unsigned int irq)
{
	unsigned long flags;
	struct ab3550 *ab;
	struct ab3550_platform_data *plf_data;

	ab = get_irq_chip_data(irq);
	plf_data = ab->i2c_client[0]->dev.platform_data;
	irq -= plf_data->irq.base;

	spin_lock_irqsave(&ab->event_lock, flags);
	ab->event_mask[irq / 8] &= ~BIT(irq % 8);
	spin_unlock_irqrestore(&ab->event_lock, flags);

	schedule_work(&ab->mask_work);
}

static void noop(unsigned int irq)
{
}

static struct irq_chip ab3550_irq_chip = {
	.name		= "ab3550-core", /* Keep the same name as the request */
	.startup	= NULL, /* defaults to enable */
	.shutdown	= NULL, /* defaults to disable */
	.enable		= NULL, /* defaults to unmask */
	.disable	= ab3550_mask, /* No default to mask in chip.c */
	.ack		= noop,
	.mask		= ab3550_mask,
	.unmask		= ab3550_unmask,
	.end		= NULL,
};

struct ab_family_id {
	u8	id;
	char	*name;
};

static const struct ab_family_id ids[] __initdata = {
	/* AB3550 */
	{
		.id = AB3550_P1A,
		.name = "P1A"
	},
	/* Terminator */
	{
		.id = 0x00,
	}
};

static int __init ab3550_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
{
	struct ab3550 *ab;
	struct ab3550_platform_data *ab3550_plf_data =
		client->dev.platform_data;
	int err;
	int i;
	int num_i2c_clients = 0;

	ab = kzalloc(sizeof(struct ab3550), GFP_KERNEL);
	if (!ab) {
		dev_err(&client->dev,
			"could not allocate " AB3550_NAME_STRING " device\n");
		return -ENOMEM;
	}

	/* Initialize data structure */
	mutex_init(&ab->access_mutex);
	spin_lock_init(&ab->event_lock);
	ab->i2c_client[0] = client;

	i2c_set_clientdata(client, ab);

	/* Read chip ID register */
	err = get_register_interruptible(ab, 0, AB3550_CID_REG, &ab->chip_id);
	if (err) {
		dev_err(&client->dev, "could not communicate with the analog "
			"baseband chip\n");
		goto exit_no_detect;
	}

	for (i = 0; ids[i].id != 0x0; i++) {
		if (ids[i].id == ab->chip_id) {
			snprintf(&ab->chip_name[0], sizeof(ab->chip_name) - 1,
				AB3550_ID_FORMAT_STRING, ids[i].name);
			break;
		}
	}

	if (ids[i].id == 0x0) {
		dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
			ab->chip_id);
		dev_err(&client->dev, "driver not started!\n");
		goto exit_no_detect;
	}

	dev_info(&client->dev, "detected AB chip: %s\n", &ab->chip_name[0]);

	/* Attach other dummy I2C clients. */
	while (++num_i2c_clients < AB3550_NUM_BANKS) {
		ab->i2c_client[num_i2c_clients] =
			i2c_new_dummy(client->adapter,
				(client->addr + num_i2c_clients));
		if (!ab->i2c_client[num_i2c_clients]) {
			err = -ENOMEM;
			goto exit_no_dummy_client;
		}
		strlcpy(ab->i2c_client[num_i2c_clients]->name, id->name,
			sizeof(ab->i2c_client[num_i2c_clients]->name));
	}

	err = ab3550_setup(ab);
	if (err)
		goto exit_no_setup;

	INIT_WORK(&ab->mask_work, ab3550_mask_work);

	for (i = 0; i < ab3550_plf_data->irq.count; i++) {
		unsigned int irq;

		irq = ab3550_plf_data->irq.base + i;
		set_irq_chip_data(irq, ab);
		set_irq_chip_and_handler(irq, &ab3550_irq_chip,
			handle_simple_irq);
		set_irq_nested_thread(irq, 1);
#ifdef CONFIG_ARM
		set_irq_flags(irq, IRQF_VALID);
#else
		set_irq_noprobe(irq);
#endif
	}

	err = request_threaded_irq(client->irq, NULL, ab3550_irq_handler,
		IRQF_ONESHOT, "ab3550-core", ab);
	/* This real unpredictable IRQ is of course sampled for entropy */
	rand_initialize_irq(client->irq);

	if (err)
		goto exit_no_irq;

	err = abx500_register_ops(&client->dev, &ab3550_ops);
	if (err)
		goto exit_no_ops;

	/* Set up and register the platform devices. */
	for (i = 0; i < AB3550_NUM_DEVICES; i++) {
		ab3550_devs[i].platform_data = ab3550_plf_data->dev_data[i];
		ab3550_devs[i].data_size = ab3550_plf_data->dev_data_sz[i];
	}

	err = mfd_add_devices(&client->dev, 0, ab3550_devs,
		ARRAY_SIZE(ab3550_devs), NULL,
		ab3550_plf_data->irq.base);

	ab3550_setup_debugfs(ab);

	return 0;

exit_no_ops:
exit_no_irq:
exit_no_setup:
exit_no_dummy_client:
	/* Unregister the dummy i2c clients. */
	while (--num_i2c_clients)
		i2c_unregister_device(ab->i2c_client[num_i2c_clients]);
exit_no_detect:
	kfree(ab);
	return err;
}

static int __exit ab3550_remove(struct i2c_client *client)
{
	struct ab3550 *ab = i2c_get_clientdata(client);
	int num_i2c_clients = AB3550_NUM_BANKS;

	mfd_remove_devices(&client->dev);
	ab3550_remove_debugfs();

	while (--num_i2c_clients)
		i2c_unregister_device(ab->i2c_client[num_i2c_clients]);

	/*
	 * At this point, all subscribers should have unregistered
	 * their notifiers so deactivate IRQ
	 */
	free_irq(client->irq, ab);
	i2c_set_clientdata(client, NULL);
	kfree(ab);
	return 0;
}

static const struct i2c_device_id ab3550_id[] = {
	{AB3550_NAME_STRING, 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, ab3550_id);

static struct i2c_driver ab3550_driver = {
	.driver = {
		.name	= AB3550_NAME_STRING,
		.owner	= THIS_MODULE,
	},
	.id_table	= ab3550_id,
	.probe		= ab3550_probe,
	.remove		= __exit_p(ab3550_remove),
};

static int __init ab3550_i2c_init(void)
{
	return i2c_add_driver(&ab3550_driver);
}

static void __exit ab3550_i2c_exit(void)
{
	i2c_del_driver(&ab3550_driver);
}

subsys_initcall(ab3550_i2c_init);
module_exit(ab3550_i2c_exit);

MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>");
MODULE_DESCRIPTION("AB3550 core driver");
MODULE_LICENSE("GPL");