Bootlin logo

Elixir Cross Referencer

   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
/*
 * twl_core.c - driver for TWL4030/TWL5030/TWL60X0/TPS659x0 PM
 * and audio CODEC devices
 *
 * Copyright (C) 2005-2006 Texas Instruments, Inc.
 *
 * Modifications to defer interrupt handling to a kernel thread:
 * Copyright (C) 2006 MontaVista Software, Inc.
 *
 * Based on tlv320aic23.c:
 * Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
 *
 * Code cleanup and modifications to IRQ handler.
 * by syed khasim <x0khasim@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>

#include <linux/regulator/machine.h>

#include <linux/i2c.h>
#include <linux/i2c/twl.h>

#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
#include <plat/cpu.h>
#endif

/*
 * The TWL4030 "Triton 2" is one of a family of a multi-function "Power
 * Management and System Companion Device" chips originally designed for
 * use in OMAP2 and OMAP 3 based systems.  Its control interfaces use I2C,
 * often at around 3 Mbit/sec, including for interrupt handling.
 *
 * This driver core provides genirq support for the interrupts emitted,
 * by the various modules, and exports register access primitives.
 *
 * FIXME this driver currently requires use of the first interrupt line
 * (and associated registers).
 */

#define DRIVER_NAME			"twl"

#if defined(CONFIG_KEYBOARD_TWL4030) || defined(CONFIG_KEYBOARD_TWL4030_MODULE)
#define twl_has_keypad()	true
#else
#define twl_has_keypad()	false
#endif

#if defined(CONFIG_GPIO_TWL4030) || defined(CONFIG_GPIO_TWL4030_MODULE)
#define twl_has_gpio()	true
#else
#define twl_has_gpio()	false
#endif

#if defined(CONFIG_REGULATOR_TWL4030) \
	|| defined(CONFIG_REGULATOR_TWL4030_MODULE)
#define twl_has_regulator()	true
#else
#define twl_has_regulator()	false
#endif

#if defined(CONFIG_TWL4030_MADC) || defined(CONFIG_TWL4030_MADC_MODULE)
#define twl_has_madc()	true
#else
#define twl_has_madc()	false
#endif

#ifdef CONFIG_TWL4030_POWER
#define twl_has_power()        true
#else
#define twl_has_power()        false
#endif

#if defined(CONFIG_RTC_DRV_TWL4030) || defined(CONFIG_RTC_DRV_TWL4030_MODULE)
#define twl_has_rtc()	true
#else
#define twl_has_rtc()	false
#endif

#if defined(CONFIG_TWL4030_USB) || defined(CONFIG_TWL4030_USB_MODULE) ||\
	defined(CONFIG_TWL6030_USB) || defined(CONFIG_TWL6030_USB_MODULE)
#define twl_has_usb()	true
#else
#define twl_has_usb()	false
#endif

#if defined(CONFIG_TWL4030_WATCHDOG) || \
	defined(CONFIG_TWL4030_WATCHDOG_MODULE)
#define twl_has_watchdog()        true
#else
#define twl_has_watchdog()        false
#endif

#if defined(CONFIG_MFD_TWL4030_AUDIO) || defined(CONFIG_MFD_TWL4030_AUDIO_MODULE) ||\
	defined(CONFIG_TWL6040_CORE) || defined(CONFIG_TWL6040_CORE_MODULE)
#define twl_has_codec()	true
#else
#define twl_has_codec()	false
#endif

#if defined(CONFIG_CHARGER_TWL4030) || defined(CONFIG_CHARGER_TWL4030_MODULE)
#define twl_has_bci()	true
#else
#define twl_has_bci()	false
#endif

/* Triton Core internal information (BEGIN) */

/* Last - for index max*/
#define TWL4030_MODULE_LAST		TWL4030_MODULE_SECURED_REG

#define TWL_NUM_SLAVES		4

#if defined(CONFIG_INPUT_TWL4030_PWRBUTTON) \
	|| defined(CONFIG_INPUT_TWL4030_PWRBUTTON_MODULE)
#define twl_has_pwrbutton()	true
#else
#define twl_has_pwrbutton()	false
#endif

#define SUB_CHIP_ID0 0
#define SUB_CHIP_ID1 1
#define SUB_CHIP_ID2 2
#define SUB_CHIP_ID3 3

#define TWL_MODULE_LAST TWL4030_MODULE_LAST

/* Base Address defns for twl4030_map[] */

/* subchip/slave 0 - USB ID */
#define TWL4030_BASEADD_USB		0x0000

/* subchip/slave 1 - AUD ID */
#define TWL4030_BASEADD_AUDIO_VOICE	0x0000
#define TWL4030_BASEADD_GPIO		0x0098
#define TWL4030_BASEADD_INTBR		0x0085
#define TWL4030_BASEADD_PIH		0x0080
#define TWL4030_BASEADD_TEST		0x004C

/* subchip/slave 2 - AUX ID */
#define TWL4030_BASEADD_INTERRUPTS	0x00B9
#define TWL4030_BASEADD_LED		0x00EE
#define TWL4030_BASEADD_MADC		0x0000
#define TWL4030_BASEADD_MAIN_CHARGE	0x0074
#define TWL4030_BASEADD_PRECHARGE	0x00AA
#define TWL4030_BASEADD_PWM0		0x00F8
#define TWL4030_BASEADD_PWM1		0x00FB
#define TWL4030_BASEADD_PWMA		0x00EF
#define TWL4030_BASEADD_PWMB		0x00F1
#define TWL4030_BASEADD_KEYPAD		0x00D2

#define TWL5031_BASEADD_ACCESSORY	0x0074 /* Replaces Main Charge */
#define TWL5031_BASEADD_INTERRUPTS	0x00B9 /* Different than TWL4030's
						  one */

/* subchip/slave 3 - POWER ID */
#define TWL4030_BASEADD_BACKUP		0x0014
#define TWL4030_BASEADD_INT		0x002E
#define TWL4030_BASEADD_PM_MASTER	0x0036
#define TWL4030_BASEADD_PM_RECEIVER	0x005B
#define TWL4030_BASEADD_RTC		0x001C
#define TWL4030_BASEADD_SECURED_REG	0x0000

/* Triton Core internal information (END) */


/* subchip/slave 0 0x48 - POWER */
#define TWL6030_BASEADD_RTC		0x0000
#define TWL6030_BASEADD_MEM		0x0017
#define TWL6030_BASEADD_PM_MASTER	0x001F
#define TWL6030_BASEADD_PM_SLAVE_MISC	0x0030 /* PM_RECEIVER */
#define TWL6030_BASEADD_PM_MISC		0x00E2
#define TWL6030_BASEADD_PM_PUPD		0x00F0

/* subchip/slave 1 0x49 - FEATURE */
#define TWL6030_BASEADD_USB		0x0000
#define TWL6030_BASEADD_GPADC_CTRL	0x002E
#define TWL6030_BASEADD_AUX		0x0090
#define TWL6030_BASEADD_PWM		0x00BA
#define TWL6030_BASEADD_GASGAUGE	0x00C0
#define TWL6030_BASEADD_PIH		0x00D0
#define TWL6030_BASEADD_CHARGER		0x00E0
#define TWL6025_BASEADD_CHARGER		0x00DA

/* subchip/slave 2 0x4A - DFT */
#define TWL6030_BASEADD_DIEID		0x00C0

/* subchip/slave 3 0x4B - AUDIO */
#define TWL6030_BASEADD_AUDIO		0x0000
#define TWL6030_BASEADD_RSV		0x0000
#define TWL6030_BASEADD_ZERO		0x0000

/* Few power values */
#define R_CFG_BOOT			0x05

/* some fields in R_CFG_BOOT */
#define HFCLK_FREQ_19p2_MHZ		(1 << 0)
#define HFCLK_FREQ_26_MHZ		(2 << 0)
#define HFCLK_FREQ_38p4_MHZ		(3 << 0)
#define HIGH_PERF_SQ			(1 << 3)
#define CK32K_LOWPWR_EN			(1 << 7)


/* chip-specific feature flags, for i2c_device_id.driver_data */
#define TWL4030_VAUX2		BIT(0)	/* pre-5030 voltage ranges */
#define TPS_SUBSET		BIT(1)	/* tps659[23]0 have fewer LDOs */
#define TWL5031			BIT(2)  /* twl5031 has different registers */
#define TWL6030_CLASS		BIT(3)	/* TWL6030 class */

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

/* is driver active, bound to a chip? */
static bool inuse;

/* TWL IDCODE Register value */
static u32 twl_idcode;

static unsigned int twl_id;
unsigned int twl_rev(void)
{
	return twl_id;
}
EXPORT_SYMBOL(twl_rev);

/* Structure for each TWL4030/TWL6030 Slave */
struct twl_client {
	struct i2c_client *client;
	u8 address;

	/* max numb of i2c_msg required is for read =2 */
	struct i2c_msg xfer_msg[2];

	/* To lock access to xfer_msg */
	struct mutex xfer_lock;
};

static struct twl_client twl_modules[TWL_NUM_SLAVES];


/* mapping the module id to slave id and base address */
struct twl_mapping {
	unsigned char sid;	/* Slave ID */
	unsigned char base;	/* base address */
};
static struct twl_mapping *twl_map;

static struct twl_mapping twl4030_map[TWL4030_MODULE_LAST + 1] = {
	/*
	 * NOTE:  don't change this table without updating the
	 * <linux/i2c/twl.h> defines for TWL4030_MODULE_*
	 * so they continue to match the order in this table.
	 */

	{ 0, TWL4030_BASEADD_USB },

	{ 1, TWL4030_BASEADD_AUDIO_VOICE },
	{ 1, TWL4030_BASEADD_GPIO },
	{ 1, TWL4030_BASEADD_INTBR },
	{ 1, TWL4030_BASEADD_PIH },
	{ 1, TWL4030_BASEADD_TEST },

	{ 2, TWL4030_BASEADD_KEYPAD },
	{ 2, TWL4030_BASEADD_MADC },
	{ 2, TWL4030_BASEADD_INTERRUPTS },
	{ 2, TWL4030_BASEADD_LED },
	{ 2, TWL4030_BASEADD_MAIN_CHARGE },
	{ 2, TWL4030_BASEADD_PRECHARGE },
	{ 2, TWL4030_BASEADD_PWM0 },
	{ 2, TWL4030_BASEADD_PWM1 },
	{ 2, TWL4030_BASEADD_PWMA },
	{ 2, TWL4030_BASEADD_PWMB },
	{ 2, TWL5031_BASEADD_ACCESSORY },
	{ 2, TWL5031_BASEADD_INTERRUPTS },

	{ 3, TWL4030_BASEADD_BACKUP },
	{ 3, TWL4030_BASEADD_INT },
	{ 3, TWL4030_BASEADD_PM_MASTER },
	{ 3, TWL4030_BASEADD_PM_RECEIVER },
	{ 3, TWL4030_BASEADD_RTC },
	{ 3, TWL4030_BASEADD_SECURED_REG },
};

static struct twl_mapping twl6030_map[] = {
	/*
	 * NOTE:  don't change this table without updating the
	 * <linux/i2c/twl.h> defines for TWL4030_MODULE_*
	 * so they continue to match the order in this table.
	 */
	{ SUB_CHIP_ID1, TWL6030_BASEADD_USB },
	{ SUB_CHIP_ID3, TWL6030_BASEADD_AUDIO },
	{ SUB_CHIP_ID2, TWL6030_BASEADD_DIEID },
	{ SUB_CHIP_ID2, TWL6030_BASEADD_RSV },
	{ SUB_CHIP_ID1, TWL6030_BASEADD_PIH },

	{ SUB_CHIP_ID2, TWL6030_BASEADD_RSV },
	{ SUB_CHIP_ID2, TWL6030_BASEADD_RSV },
	{ SUB_CHIP_ID1, TWL6030_BASEADD_GPADC_CTRL },
	{ SUB_CHIP_ID2, TWL6030_BASEADD_RSV },
	{ SUB_CHIP_ID2, TWL6030_BASEADD_RSV },

	{ SUB_CHIP_ID1, TWL6030_BASEADD_CHARGER },
	{ SUB_CHIP_ID1, TWL6030_BASEADD_GASGAUGE },
	{ SUB_CHIP_ID1, TWL6030_BASEADD_PWM },
	{ SUB_CHIP_ID0, TWL6030_BASEADD_ZERO },
	{ SUB_CHIP_ID1, TWL6030_BASEADD_ZERO },

	{ SUB_CHIP_ID2, TWL6030_BASEADD_ZERO },
	{ SUB_CHIP_ID2, TWL6030_BASEADD_ZERO },
	{ SUB_CHIP_ID2, TWL6030_BASEADD_RSV },
	{ SUB_CHIP_ID2, TWL6030_BASEADD_RSV },
	{ SUB_CHIP_ID2, TWL6030_BASEADD_RSV },
	{ SUB_CHIP_ID0, TWL6030_BASEADD_PM_MASTER },
	{ SUB_CHIP_ID0, TWL6030_BASEADD_PM_SLAVE_MISC },

	{ SUB_CHIP_ID0, TWL6030_BASEADD_RTC },
	{ SUB_CHIP_ID0, TWL6030_BASEADD_MEM },
	{ SUB_CHIP_ID1, TWL6025_BASEADD_CHARGER },
};

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

/* Exported Functions */

/**
 * twl_i2c_write - Writes a n bit register in TWL4030/TWL5030/TWL60X0
 * @mod_no: module number
 * @value: an array of num_bytes+1 containing data to write
 * @reg: register address (just offset will do)
 * @num_bytes: number of bytes to transfer
 *
 * IMPORTANT: for 'value' parameter: Allocate value num_bytes+1 and
 * valid data starts at Offset 1.
 *
 * Returns the result of operation - 0 is success
 */
int twl_i2c_write(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
{
	int ret;
	int sid;
	struct twl_client *twl;
	struct i2c_msg *msg;

	if (unlikely(mod_no > TWL_MODULE_LAST)) {
		pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
		return -EPERM;
	}
	sid = twl_map[mod_no].sid;
	twl = &twl_modules[sid];

	if (unlikely(!inuse)) {
		pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
		return -EPERM;
	}
	mutex_lock(&twl->xfer_lock);
	/*
	 * [MSG1]: fill the register address data
	 * fill the data Tx buffer
	 */
	msg = &twl->xfer_msg[0];
	msg->addr = twl->address;
	msg->len = num_bytes + 1;
	msg->flags = 0;
	msg->buf = value;
	/* over write the first byte of buffer with the register address */
	*value = twl_map[mod_no].base + reg;
	ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 1);
	mutex_unlock(&twl->xfer_lock);

	/* i2c_transfer returns number of messages transferred */
	if (ret != 1) {
		pr_err("%s: i2c_write failed to transfer all messages\n",
			DRIVER_NAME);
		if (ret < 0)
			return ret;
		else
			return -EIO;
	} else {
		return 0;
	}
}
EXPORT_SYMBOL(twl_i2c_write);

/**
 * twl_i2c_read - Reads a n bit register in TWL4030/TWL5030/TWL60X0
 * @mod_no: module number
 * @value: an array of num_bytes containing data to be read
 * @reg: register address (just offset will do)
 * @num_bytes: number of bytes to transfer
 *
 * Returns result of operation - num_bytes is success else failure.
 */
int twl_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
{
	int ret;
	u8 val;
	int sid;
	struct twl_client *twl;
	struct i2c_msg *msg;

	if (unlikely(mod_no > TWL_MODULE_LAST)) {
		pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
		return -EPERM;
	}
	sid = twl_map[mod_no].sid;
	twl = &twl_modules[sid];

	if (unlikely(!inuse)) {
		pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
		return -EPERM;
	}
	mutex_lock(&twl->xfer_lock);
	/* [MSG1] fill the register address data */
	msg = &twl->xfer_msg[0];
	msg->addr = twl->address;
	msg->len = 1;
	msg->flags = 0;	/* Read the register value */
	val = twl_map[mod_no].base + reg;
	msg->buf = &val;
	/* [MSG2] fill the data rx buffer */
	msg = &twl->xfer_msg[1];
	msg->addr = twl->address;
	msg->flags = I2C_M_RD;	/* Read the register value */
	msg->len = num_bytes;	/* only n bytes */
	msg->buf = value;
	ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 2);
	mutex_unlock(&twl->xfer_lock);

	/* i2c_transfer returns number of messages transferred */
	if (ret != 2) {
		pr_err("%s: i2c_read failed to transfer all messages\n",
			DRIVER_NAME);
		if (ret < 0)
			return ret;
		else
			return -EIO;
	} else {
		return 0;
	}
}
EXPORT_SYMBOL(twl_i2c_read);

/**
 * twl_i2c_write_u8 - Writes a 8 bit register in TWL4030/TWL5030/TWL60X0
 * @mod_no: module number
 * @value: the value to be written 8 bit
 * @reg: register address (just offset will do)
 *
 * Returns result of operation - 0 is success
 */
int twl_i2c_write_u8(u8 mod_no, u8 value, u8 reg)
{

	/* 2 bytes offset 1 contains the data offset 0 is used by i2c_write */
	u8 temp_buffer[2] = { 0 };
	/* offset 1 contains the data */
	temp_buffer[1] = value;
	return twl_i2c_write(mod_no, temp_buffer, reg, 1);
}
EXPORT_SYMBOL(twl_i2c_write_u8);

/**
 * twl_i2c_read_u8 - Reads a 8 bit register from TWL4030/TWL5030/TWL60X0
 * @mod_no: module number
 * @value: the value read 8 bit
 * @reg: register address (just offset will do)
 *
 * Returns result of operation - 0 is success
 */
int twl_i2c_read_u8(u8 mod_no, u8 *value, u8 reg)
{
	return twl_i2c_read(mod_no, value, reg, 1);
}
EXPORT_SYMBOL(twl_i2c_read_u8);

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

/**
 * twl_read_idcode_register - API to read the IDCODE register.
 *
 * Unlocks the IDCODE register and read the 32 bit value.
 */
static int twl_read_idcode_register(void)
{
	int err;

	err = twl_i2c_write_u8(TWL4030_MODULE_INTBR, TWL_EEPROM_R_UNLOCK,
						REG_UNLOCK_TEST_REG);
	if (err) {
		pr_err("TWL4030 Unable to unlock IDCODE registers -%d\n", err);
		goto fail;
	}

	err = twl_i2c_read(TWL4030_MODULE_INTBR, (u8 *)(&twl_idcode),
						REG_IDCODE_7_0, 4);
	if (err) {
		pr_err("TWL4030: unable to read IDCODE -%d\n", err);
		goto fail;
	}

	err = twl_i2c_write_u8(TWL4030_MODULE_INTBR, 0x0, REG_UNLOCK_TEST_REG);
	if (err)
		pr_err("TWL4030 Unable to relock IDCODE registers -%d\n", err);
fail:
	return err;
}

/**
 * twl_get_type - API to get TWL Si type.
 *
 * Api to get the TWL Si type from IDCODE value.
 */
int twl_get_type(void)
{
	return TWL_SIL_TYPE(twl_idcode);
}
EXPORT_SYMBOL_GPL(twl_get_type);

/**
 * twl_get_version - API to get TWL Si version.
 *
 * Api to get the TWL Si version from IDCODE value.
 */
int twl_get_version(void)
{
	return TWL_SIL_REV(twl_idcode);
}
EXPORT_SYMBOL_GPL(twl_get_version);

static struct device *
add_numbered_child(unsigned chip, const char *name, int num,
		void *pdata, unsigned pdata_len,
		bool can_wakeup, int irq0, int irq1)
{
	struct platform_device	*pdev;
	struct twl_client	*twl = &twl_modules[chip];
	int			status;

	pdev = platform_device_alloc(name, num);
	if (!pdev) {
		dev_dbg(&twl->client->dev, "can't alloc dev\n");
		status = -ENOMEM;
		goto err;
	}

	device_init_wakeup(&pdev->dev, can_wakeup);
	pdev->dev.parent = &twl->client->dev;

	if (pdata) {
		status = platform_device_add_data(pdev, pdata, pdata_len);
		if (status < 0) {
			dev_dbg(&pdev->dev, "can't add platform_data\n");
			goto err;
		}
	}

	if (irq0) {
		struct resource r[2] = {
			{ .start = irq0, .flags = IORESOURCE_IRQ, },
			{ .start = irq1, .flags = IORESOURCE_IRQ, },
		};

		status = platform_device_add_resources(pdev, r, irq1 ? 2 : 1);
		if (status < 0) {
			dev_dbg(&pdev->dev, "can't add irqs\n");
			goto err;
		}
	}

	status = platform_device_add(pdev);

err:
	if (status < 0) {
		platform_device_put(pdev);
		dev_err(&twl->client->dev, "can't add %s dev\n", name);
		return ERR_PTR(status);
	}
	return &pdev->dev;
}

static inline struct device *add_child(unsigned chip, const char *name,
		void *pdata, unsigned pdata_len,
		bool can_wakeup, int irq0, int irq1)
{
	return add_numbered_child(chip, name, -1, pdata, pdata_len,
		can_wakeup, irq0, irq1);
}

static struct device *
add_regulator_linked(int num, struct regulator_init_data *pdata,
		struct regulator_consumer_supply *consumers,
		unsigned num_consumers, unsigned long features)
{
	unsigned sub_chip_id;
	/* regulator framework demands init_data ... */
	if (!pdata)
		return NULL;

	if (consumers) {
		pdata->consumer_supplies = consumers;
		pdata->num_consumer_supplies = num_consumers;
	}

	pdata->driver_data = (void *)features;

	/* NOTE:  we currently ignore regulator IRQs, e.g. for short circuits */
	sub_chip_id = twl_map[TWL_MODULE_PM_MASTER].sid;
	return add_numbered_child(sub_chip_id, "twl_reg", num,
		pdata, sizeof(*pdata), false, 0, 0);
}

static struct device *
add_regulator(int num, struct regulator_init_data *pdata,
		unsigned long features)
{
	return add_regulator_linked(num, pdata, NULL, 0, features);
}

/*
 * NOTE:  We know the first 8 IRQs after pdata->base_irq are
 * for the PIH, and the next are for the PWR_INT SIH, since
 * that's how twl_init_irq() sets things up.
 */

static int
add_children(struct twl4030_platform_data *pdata, unsigned long features)
{
	struct device	*child;
	unsigned sub_chip_id;

	if (twl_has_gpio() && pdata->gpio) {
		child = add_child(SUB_CHIP_ID1, "twl4030_gpio",
				pdata->gpio, sizeof(*pdata->gpio),
				false, pdata->irq_base + GPIO_INTR_OFFSET, 0);
		if (IS_ERR(child))
			return PTR_ERR(child);
	}

	if (twl_has_keypad() && pdata->keypad) {
		child = add_child(SUB_CHIP_ID2, "twl4030_keypad",
				pdata->keypad, sizeof(*pdata->keypad),
				true, pdata->irq_base + KEYPAD_INTR_OFFSET, 0);
		if (IS_ERR(child))
			return PTR_ERR(child);
	}

	if (twl_has_madc() && pdata->madc) {
		child = add_child(2, "twl4030_madc",
				pdata->madc, sizeof(*pdata->madc),
				true, pdata->irq_base + MADC_INTR_OFFSET, 0);
		if (IS_ERR(child))
			return PTR_ERR(child);
	}

	if (twl_has_rtc()) {
		/*
		 * REVISIT platform_data here currently might expose the
		 * "msecure" line ... but for now we just expect board
		 * setup to tell the chip "it's always ok to SET_TIME".
		 * Eventually, Linux might become more aware of such
		 * HW security concerns, and "least privilege".
		 */
		sub_chip_id = twl_map[TWL_MODULE_RTC].sid;
		child = add_child(sub_chip_id, "twl_rtc",
				NULL, 0,
				true, pdata->irq_base + RTC_INTR_OFFSET, 0);
		if (IS_ERR(child))
			return PTR_ERR(child);
	}

	if (twl_has_usb() && pdata->usb && twl_class_is_4030()) {

		static struct regulator_consumer_supply usb1v5 = {
			.supply =	"usb1v5",
		};
		static struct regulator_consumer_supply usb1v8 = {
			.supply =	"usb1v8",
		};
		static struct regulator_consumer_supply usb3v1 = {
			.supply =	"usb3v1",
		};

	/* First add the regulators so that they can be used by transceiver */
		if (twl_has_regulator()) {
			/* this is a template that gets copied */
			struct regulator_init_data usb_fixed = {
				.constraints.valid_modes_mask =
					REGULATOR_MODE_NORMAL
					| REGULATOR_MODE_STANDBY,
				.constraints.valid_ops_mask =
					REGULATOR_CHANGE_MODE
					| REGULATOR_CHANGE_STATUS,
			};

			child = add_regulator_linked(TWL4030_REG_VUSB1V5,
						      &usb_fixed, &usb1v5, 1,
						      features);
			if (IS_ERR(child))
				return PTR_ERR(child);

			child = add_regulator_linked(TWL4030_REG_VUSB1V8,
						      &usb_fixed, &usb1v8, 1,
						      features);
			if (IS_ERR(child))
				return PTR_ERR(child);

			child = add_regulator_linked(TWL4030_REG_VUSB3V1,
						      &usb_fixed, &usb3v1, 1,
						      features);
			if (IS_ERR(child))
				return PTR_ERR(child);

		}

		child = add_child(0, "twl4030_usb",
				pdata->usb, sizeof(*pdata->usb),
				true,
				/* irq0 = USB_PRES, irq1 = USB */
				pdata->irq_base + USB_PRES_INTR_OFFSET,
				pdata->irq_base + USB_INTR_OFFSET);

		if (IS_ERR(child))
			return PTR_ERR(child);

		/* we need to connect regulators to this transceiver */
		if (twl_has_regulator() && child) {
			usb1v5.dev = child;
			usb1v8.dev = child;
			usb3v1.dev = child;
		}
	}
	if (twl_has_usb() && pdata->usb && twl_class_is_6030()) {

		static struct regulator_consumer_supply usb3v3;
		int regulator;

		if (twl_has_regulator()) {
			/* this is a template that gets copied */
			struct regulator_init_data usb_fixed = {
				.constraints.valid_modes_mask =
					REGULATOR_MODE_NORMAL
					| REGULATOR_MODE_STANDBY,
				.constraints.valid_ops_mask =
					REGULATOR_CHANGE_MODE
					| REGULATOR_CHANGE_STATUS,
			};

			if (features & TWL6025_SUBCLASS) {
				usb3v3.supply =	"ldousb";
				regulator = TWL6025_REG_LDOUSB;
			} else {
				usb3v3.supply = "vusb";
				regulator = TWL6030_REG_VUSB;
			}
			child = add_regulator_linked(regulator, &usb_fixed,
							&usb3v3, 1,
							features);
			if (IS_ERR(child))
				return PTR_ERR(child);
		}

		pdata->usb->features = features;

		child = add_child(0, "twl6030_usb",
			pdata->usb, sizeof(*pdata->usb),
			true,
			/* irq1 = VBUS_PRES, irq0 = USB ID */
			pdata->irq_base + USBOTG_INTR_OFFSET,
			pdata->irq_base + USB_PRES_INTR_OFFSET);

		if (IS_ERR(child))
			return PTR_ERR(child);
		/* we need to connect regulators to this transceiver */
		if (twl_has_regulator() && child)
			usb3v3.dev = child;
	} else if (twl_has_regulator() && twl_class_is_6030()) {
		if (features & TWL6025_SUBCLASS)
			child = add_regulator(TWL6025_REG_LDOUSB,
						pdata->ldousb, features);
		else
			child = add_regulator(TWL6030_REG_VUSB,
						pdata->vusb, features);

			if (IS_ERR(child))
					return PTR_ERR(child);
	}

	if (twl_has_watchdog() && twl_class_is_4030()) {
		child = add_child(0, "twl4030_wdt", NULL, 0, false, 0, 0);
		if (IS_ERR(child))
			return PTR_ERR(child);
	}

	if (twl_has_pwrbutton() && twl_class_is_4030()) {
		child = add_child(1, "twl4030_pwrbutton",
				NULL, 0, true, pdata->irq_base + 8 + 0, 0);
		if (IS_ERR(child))
			return PTR_ERR(child);
	}

	if (twl_has_codec() && pdata->audio && twl_class_is_4030()) {
		sub_chip_id = twl_map[TWL_MODULE_AUDIO_VOICE].sid;
		child = add_child(sub_chip_id, "twl4030-audio",
				pdata->audio, sizeof(*pdata->audio),
				false, 0, 0);
		if (IS_ERR(child))
			return PTR_ERR(child);
	}

	if (twl_has_codec() && pdata->audio && twl_class_is_6030()) {
		sub_chip_id = twl_map[TWL_MODULE_AUDIO_VOICE].sid;
		child = add_child(sub_chip_id, "twl6040",
				pdata->audio, sizeof(*pdata->audio),
				false, 0, 0);
		if (IS_ERR(child))
			return PTR_ERR(child);
	}

	/* twl4030 regulators */
	if (twl_has_regulator() && twl_class_is_4030()) {
		child = add_regulator(TWL4030_REG_VPLL1, pdata->vpll1,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL4030_REG_VIO, pdata->vio,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL4030_REG_VDD1, pdata->vdd1,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL4030_REG_VDD2, pdata->vdd2,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL4030_REG_VMMC1, pdata->vmmc1,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL4030_REG_VDAC, pdata->vdac,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator((features & TWL4030_VAUX2)
					? TWL4030_REG_VAUX2_4030
					: TWL4030_REG_VAUX2,
				pdata->vaux2, features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL4030_REG_VINTANA1, pdata->vintana1,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL4030_REG_VINTANA2, pdata->vintana2,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL4030_REG_VINTDIG, pdata->vintdig,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);
	}

	/* maybe add LDOs that are omitted on cost-reduced parts */
	if (twl_has_regulator() && !(features & TPS_SUBSET)
	  && twl_class_is_4030()) {
		child = add_regulator(TWL4030_REG_VPLL2, pdata->vpll2,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL4030_REG_VMMC2, pdata->vmmc2,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL4030_REG_VSIM, pdata->vsim,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL4030_REG_VAUX1, pdata->vaux1,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL4030_REG_VAUX3, pdata->vaux3,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL4030_REG_VAUX4, pdata->vaux4,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);
	}

	/* twl6030 regulators */
	if (twl_has_regulator() && twl_class_is_6030() &&
			!(features & TWL6025_SUBCLASS)) {
		child = add_regulator(TWL6030_REG_VMMC, pdata->vmmc,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6030_REG_VPP, pdata->vpp,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6030_REG_VUSIM, pdata->vusim,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6030_REG_VCXIO, pdata->vcxio,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6030_REG_VDAC, pdata->vdac,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6030_REG_VAUX1_6030, pdata->vaux1,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6030_REG_VAUX2_6030, pdata->vaux2,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6030_REG_VAUX3_6030, pdata->vaux3,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6030_REG_CLK32KG, pdata->clk32kg,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);
	}

	/* 6030 and 6025 share this regulator */
	if (twl_has_regulator() && twl_class_is_6030()) {
		child = add_regulator(TWL6030_REG_VANA, pdata->vana,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);
	}

	/* twl6025 regulators */
	if (twl_has_regulator() && twl_class_is_6030() &&
			(features & TWL6025_SUBCLASS)) {
		child = add_regulator(TWL6025_REG_LDO5, pdata->ldo5,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6025_REG_LDO1, pdata->ldo1,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6025_REG_LDO7, pdata->ldo7,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6025_REG_LDO6, pdata->ldo6,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6025_REG_LDOLN, pdata->ldoln,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6025_REG_LDO2, pdata->ldo2,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6025_REG_LDO4, pdata->ldo4,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6025_REG_LDO3, pdata->ldo3,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6025_REG_SMPS3, pdata->smps3,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6025_REG_SMPS4, pdata->smps4,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

		child = add_regulator(TWL6025_REG_VIO, pdata->vio6025,
					features);
		if (IS_ERR(child))
			return PTR_ERR(child);

	}

	if (twl_has_bci() && pdata->bci &&
			!(features & (TPS_SUBSET | TWL5031))) {
		child = add_child(3, "twl4030_bci",
				pdata->bci, sizeof(*pdata->bci), false,
				/* irq0 = CHG_PRES, irq1 = BCI */
				pdata->irq_base + BCI_PRES_INTR_OFFSET,
				pdata->irq_base + BCI_INTR_OFFSET);
		if (IS_ERR(child))
			return PTR_ERR(child);
	}

	return 0;
}

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

/*
 * These three functions initialize the on-chip clock framework,
 * letting it generate the right frequencies for USB, MADC, and
 * other purposes.
 */
static inline int __init protect_pm_master(void)
{
	int e = 0;

	e = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0,
			TWL4030_PM_MASTER_PROTECT_KEY);
	return e;
}

static inline int __init unprotect_pm_master(void)
{
	int e = 0;

	e |= twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
			TWL4030_PM_MASTER_KEY_CFG1,
			TWL4030_PM_MASTER_PROTECT_KEY);
	e |= twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
			TWL4030_PM_MASTER_KEY_CFG2,
			TWL4030_PM_MASTER_PROTECT_KEY);

	return e;
}

static void clocks_init(struct device *dev,
			struct twl4030_clock_init_data *clock)
{
	int e = 0;
	struct clk *osc;
	u32 rate;
	u8 ctrl = HFCLK_FREQ_26_MHZ;

#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
	if (cpu_is_omap2430())
		osc = clk_get(dev, "osc_ck");
	else
		osc = clk_get(dev, "osc_sys_ck");

	if (IS_ERR(osc)) {
		printk(KERN_WARNING "Skipping twl internal clock init and "
				"using bootloader value (unknown osc rate)\n");
		return;
	}

	rate = clk_get_rate(osc);
	clk_put(osc);

#else
	/* REVISIT for non-OMAP systems, pass the clock rate from
	 * board init code, using platform_data.
	 */
	osc = ERR_PTR(-EIO);

	printk(KERN_WARNING "Skipping twl internal clock init and "
	       "using bootloader value (unknown osc rate)\n");

	return;
#endif

	switch (rate) {
	case 19200000:
		ctrl = HFCLK_FREQ_19p2_MHZ;
		break;
	case 26000000:
		ctrl = HFCLK_FREQ_26_MHZ;
		break;
	case 38400000:
		ctrl = HFCLK_FREQ_38p4_MHZ;
		break;
	}

	ctrl |= HIGH_PERF_SQ;
	if (clock && clock->ck32k_lowpwr_enable)
		ctrl |= CK32K_LOWPWR_EN;

	e |= unprotect_pm_master();
	/* effect->MADC+USB ck en */
	e |= twl_i2c_write_u8(TWL_MODULE_PM_MASTER, ctrl, R_CFG_BOOT);
	e |= protect_pm_master();

	if (e < 0)
		pr_err("%s: clock init err [%d]\n", DRIVER_NAME, e);
}

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

int twl4030_init_irq(int irq_num, unsigned irq_base, unsigned irq_end);
int twl4030_exit_irq(void);
int twl4030_init_chip_irq(const char *chip);
int twl6030_init_irq(int irq_num, unsigned irq_base, unsigned irq_end);
int twl6030_exit_irq(void);

static int twl_remove(struct i2c_client *client)
{
	unsigned i;
	int status;

	if (twl_class_is_4030())
		status = twl4030_exit_irq();
	else
		status = twl6030_exit_irq();

	if (status < 0)
		return status;

	for (i = 0; i < TWL_NUM_SLAVES; i++) {
		struct twl_client	*twl = &twl_modules[i];

		if (twl->client && twl->client != client)
			i2c_unregister_device(twl->client);
		twl_modules[i].client = NULL;
	}
	inuse = false;
	return 0;
}

/* NOTE:  this driver only handles a single twl4030/tps659x0 chip */
static int __devinit
twl_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	int				status;
	unsigned			i;
	struct twl4030_platform_data	*pdata = client->dev.platform_data;
	u8 temp;
	int ret = 0;

	if (!pdata) {
		dev_dbg(&client->dev, "no platform data?\n");
		return -EINVAL;
	}

	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C) == 0) {
		dev_dbg(&client->dev, "can't talk I2C?\n");
		return -EIO;
	}

	if (inuse) {
		dev_dbg(&client->dev, "driver is already in use\n");
		return -EBUSY;
	}

	for (i = 0; i < TWL_NUM_SLAVES; i++) {
		struct twl_client	*twl = &twl_modules[i];

		twl->address = client->addr + i;
		if (i == 0)
			twl->client = client;
		else {
			twl->client = i2c_new_dummy(client->adapter,
					twl->address);
			if (!twl->client) {
				dev_err(&client->dev,
					"can't attach client %d\n", i);
				status = -ENOMEM;
				goto fail;
			}
		}
		mutex_init(&twl->xfer_lock);
	}
	inuse = true;
	if ((id->driver_data) & TWL6030_CLASS) {
		twl_id = TWL6030_CLASS_ID;
		twl_map = &twl6030_map[0];
	} else {
		twl_id = TWL4030_CLASS_ID;
		twl_map = &twl4030_map[0];
	}

	/* setup clock framework */
	clocks_init(&client->dev, pdata->clock);

	/* read TWL IDCODE Register */
	if (twl_id == TWL4030_CLASS_ID) {
		ret = twl_read_idcode_register();
		WARN(ret < 0, "Error: reading twl_idcode register value\n");
	}

	/* load power event scripts */
	if (twl_has_power() && pdata->power)
		twl4030_power_init(pdata->power);

	/* Maybe init the T2 Interrupt subsystem */
	if (client->irq
			&& pdata->irq_base
			&& pdata->irq_end > pdata->irq_base) {
		if (twl_class_is_4030()) {
			twl4030_init_chip_irq(id->name);
			status = twl4030_init_irq(client->irq, pdata->irq_base,
			pdata->irq_end);
		} else {
			status = twl6030_init_irq(client->irq, pdata->irq_base,
			pdata->irq_end);
		}

		if (status < 0)
			goto fail;
	}

	/* Disable TWL4030/TWL5030 I2C Pull-up on I2C1 and I2C4(SR) interface.
	 * Program I2C_SCL_CTRL_PU(bit 0)=0, I2C_SDA_CTRL_PU (bit 2)=0,
	 * SR_I2C_SCL_CTRL_PU(bit 4)=0 and SR_I2C_SDA_CTRL_PU(bit 6)=0.
	 */

	if (twl_class_is_4030()) {
		twl_i2c_read_u8(TWL4030_MODULE_INTBR, &temp, REG_GPPUPDCTR1);
		temp &= ~(SR_I2C_SDA_CTRL_PU | SR_I2C_SCL_CTRL_PU | \
		I2C_SDA_CTRL_PU | I2C_SCL_CTRL_PU);
		twl_i2c_write_u8(TWL4030_MODULE_INTBR, temp, REG_GPPUPDCTR1);
	}

	status = add_children(pdata, id->driver_data);
fail:
	if (status < 0)
		twl_remove(client);
	return status;
}

static const struct i2c_device_id twl_ids[] = {
	{ "twl4030", TWL4030_VAUX2 },	/* "Triton 2" */
	{ "twl5030", 0 },		/* T2 updated */
	{ "twl5031", TWL5031 },		/* TWL5030 updated */
	{ "tps65950", 0 },		/* catalog version of twl5030 */
	{ "tps65930", TPS_SUBSET },	/* fewer LDOs and DACs; no charger */
	{ "tps65920", TPS_SUBSET },	/* fewer LDOs; no codec or charger */
	{ "tps65921", TPS_SUBSET },	/* fewer LDOs; no codec, no LED
					   and vibrator. Charger in USB module*/
	{ "twl6030", TWL6030_CLASS },	/* "Phoenix power chip" */
	{ "twl6025", TWL6030_CLASS | TWL6025_SUBCLASS }, /* "Phoenix lite" */
	{ /* end of list */ },
};
MODULE_DEVICE_TABLE(i2c, twl_ids);

/* One Client Driver , 4 Clients */
static struct i2c_driver twl_driver = {
	.driver.name	= DRIVER_NAME,
	.id_table	= twl_ids,
	.probe		= twl_probe,
	.remove		= twl_remove,
};

static int __init twl_init(void)
{
	return i2c_add_driver(&twl_driver);
}
subsys_initcall(twl_init);

static void __exit twl_exit(void)
{
	i2c_del_driver(&twl_driver);
}
module_exit(twl_exit);

MODULE_AUTHOR("Texas Instruments, Inc.");
MODULE_DESCRIPTION("I2C Core interface for TWL");
MODULE_LICENSE("GPL");