Free Electrons

Embedded Linux Experts

   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
/*
 * Copyright (C) 2004 Texas Instruments, Inc.
 *
 * Some parts based tps65010.c:
 * Copyright (C) 2004 Texas Instruments and
 * Copyright (C) 2004-2005 David Brownell
 *
 * Some parts based on tlv320aic24.c:
 * Copyright (C) by Kai Svahn <kai.svahn@nokia.com>
 *
 * Changes for interrupt handling and clean-up by
 * Tony Lindgren <tony@atomide.com> and Imre Deak <imre.deak@nokia.com>
 * Cleanup and generalized support for voltage setting by
 * Juha Yrjola
 * Added support for controlling VCORE and regulator sleep states,
 * Amit Kucheria <amit.kucheria@nokia.com>
 * Copyright (C) 2005, 2006 Nokia Corporation
 *
 * 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/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/slab.h>
#include <linux/mfd/menelaus.h>
#include <linux/gpio.h>

#include <asm/mach/irq.h>


#define DRIVER_NAME			"menelaus"

#define MENELAUS_I2C_ADDRESS		0x72

#define MENELAUS_REV			0x01
#define MENELAUS_VCORE_CTRL1		0x02
#define MENELAUS_VCORE_CTRL2		0x03
#define MENELAUS_VCORE_CTRL3		0x04
#define MENELAUS_VCORE_CTRL4		0x05
#define MENELAUS_VCORE_CTRL5		0x06
#define MENELAUS_DCDC_CTRL1		0x07
#define MENELAUS_DCDC_CTRL2		0x08
#define MENELAUS_DCDC_CTRL3		0x09
#define MENELAUS_LDO_CTRL1		0x0A
#define MENELAUS_LDO_CTRL2		0x0B
#define MENELAUS_LDO_CTRL3		0x0C
#define MENELAUS_LDO_CTRL4		0x0D
#define MENELAUS_LDO_CTRL5		0x0E
#define MENELAUS_LDO_CTRL6		0x0F
#define MENELAUS_LDO_CTRL7		0x10
#define MENELAUS_LDO_CTRL8		0x11
#define MENELAUS_SLEEP_CTRL1		0x12
#define MENELAUS_SLEEP_CTRL2		0x13
#define MENELAUS_DEVICE_OFF		0x14
#define MENELAUS_OSC_CTRL		0x15
#define MENELAUS_DETECT_CTRL		0x16
#define MENELAUS_INT_MASK1		0x17
#define MENELAUS_INT_MASK2		0x18
#define MENELAUS_INT_STATUS1		0x19
#define MENELAUS_INT_STATUS2		0x1A
#define MENELAUS_INT_ACK1		0x1B
#define MENELAUS_INT_ACK2		0x1C
#define MENELAUS_GPIO_CTRL		0x1D
#define MENELAUS_GPIO_IN		0x1E
#define MENELAUS_GPIO_OUT		0x1F
#define MENELAUS_BBSMS			0x20
#define MENELAUS_RTC_CTRL		0x21
#define MENELAUS_RTC_UPDATE		0x22
#define MENELAUS_RTC_SEC		0x23
#define MENELAUS_RTC_MIN		0x24
#define MENELAUS_RTC_HR			0x25
#define MENELAUS_RTC_DAY		0x26
#define MENELAUS_RTC_MON		0x27
#define MENELAUS_RTC_YR			0x28
#define MENELAUS_RTC_WKDAY		0x29
#define MENELAUS_RTC_AL_SEC		0x2A
#define MENELAUS_RTC_AL_MIN		0x2B
#define MENELAUS_RTC_AL_HR		0x2C
#define MENELAUS_RTC_AL_DAY		0x2D
#define MENELAUS_RTC_AL_MON		0x2E
#define MENELAUS_RTC_AL_YR		0x2F
#define MENELAUS_RTC_COMP_MSB		0x30
#define MENELAUS_RTC_COMP_LSB		0x31
#define MENELAUS_S1_PULL_EN		0x32
#define MENELAUS_S1_PULL_DIR		0x33
#define MENELAUS_S2_PULL_EN		0x34
#define MENELAUS_S2_PULL_DIR		0x35
#define MENELAUS_MCT_CTRL1		0x36
#define MENELAUS_MCT_CTRL2		0x37
#define MENELAUS_MCT_CTRL3		0x38
#define MENELAUS_MCT_PIN_ST		0x39
#define MENELAUS_DEBOUNCE1		0x3A

#define IH_MENELAUS_IRQS		12
#define MENELAUS_MMC_S1CD_IRQ		0	/* MMC slot 1 card change */
#define MENELAUS_MMC_S2CD_IRQ		1	/* MMC slot 2 card change */
#define MENELAUS_MMC_S1D1_IRQ		2	/* MMC DAT1 low in slot 1 */
#define MENELAUS_MMC_S2D1_IRQ		3	/* MMC DAT1 low in slot 2 */
#define MENELAUS_LOWBAT_IRQ		4	/* Low battery */
#define MENELAUS_HOTDIE_IRQ		5	/* Hot die detect */
#define MENELAUS_UVLO_IRQ		6	/* UVLO detect */
#define MENELAUS_TSHUT_IRQ		7	/* Thermal shutdown */
#define MENELAUS_RTCTMR_IRQ		8	/* RTC timer */
#define MENELAUS_RTCALM_IRQ		9	/* RTC alarm */
#define MENELAUS_RTCERR_IRQ		10	/* RTC error */
#define MENELAUS_PSHBTN_IRQ		11	/* Push button */
#define MENELAUS_RESERVED12_IRQ		12	/* Reserved */
#define MENELAUS_RESERVED13_IRQ		13	/* Reserved */
#define MENELAUS_RESERVED14_IRQ		14	/* Reserved */
#define MENELAUS_RESERVED15_IRQ		15	/* Reserved */

/* VCORE_CTRL1 register */
#define VCORE_CTRL1_BYP_COMP		(1 << 5)
#define VCORE_CTRL1_HW_NSW		(1 << 7)

/* GPIO_CTRL register */
#define GPIO_CTRL_SLOTSELEN		(1 << 5)
#define GPIO_CTRL_SLPCTLEN		(1 << 6)
#define GPIO1_DIR_INPUT			(1 << 0)
#define GPIO2_DIR_INPUT			(1 << 1)
#define GPIO3_DIR_INPUT			(1 << 2)

/* MCT_CTRL1 register */
#define MCT_CTRL1_S1_CMD_OD		(1 << 2)
#define MCT_CTRL1_S2_CMD_OD		(1 << 3)

/* MCT_CTRL2 register */
#define MCT_CTRL2_VS2_SEL_D0		(1 << 0)
#define MCT_CTRL2_VS2_SEL_D1		(1 << 1)
#define MCT_CTRL2_S1CD_BUFEN		(1 << 4)
#define MCT_CTRL2_S2CD_BUFEN		(1 << 5)
#define MCT_CTRL2_S1CD_DBEN		(1 << 6)
#define MCT_CTRL2_S2CD_BEN		(1 << 7)

/* MCT_CTRL3 register */
#define MCT_CTRL3_SLOT1_EN		(1 << 0)
#define MCT_CTRL3_SLOT2_EN		(1 << 1)
#define MCT_CTRL3_S1_AUTO_EN		(1 << 2)
#define MCT_CTRL3_S2_AUTO_EN		(1 << 3)

/* MCT_PIN_ST register */
#define MCT_PIN_ST_S1_CD_ST		(1 << 0)
#define MCT_PIN_ST_S2_CD_ST		(1 << 1)

static void menelaus_work(struct work_struct *_menelaus);

struct menelaus_chip {
	struct mutex		lock;
	struct i2c_client	*client;
	struct work_struct	work;
#ifdef CONFIG_RTC_DRV_TWL92330
	struct rtc_device	*rtc;
	u8			rtc_control;
	unsigned		uie:1;
#endif
	unsigned		vcore_hw_mode:1;
	u8			mask1, mask2;
	void			(*handlers[16])(struct menelaus_chip *);
	void			(*mmc_callback)(void *data, u8 mask);
	void			*mmc_callback_data;
};

static struct menelaus_chip *the_menelaus;

static int menelaus_write_reg(int reg, u8 value)
{
	int val = i2c_smbus_write_byte_data(the_menelaus->client, reg, value);

	if (val < 0) {
		pr_err(DRIVER_NAME ": write error");
		return val;
	}

	return 0;
}

static int menelaus_read_reg(int reg)
{
	int val = i2c_smbus_read_byte_data(the_menelaus->client, reg);

	if (val < 0)
		pr_err(DRIVER_NAME ": read error");

	return val;
}

static int menelaus_enable_irq(int irq)
{
	if (irq > 7) {
		irq -= 8;
		the_menelaus->mask2 &= ~(1 << irq);
		return menelaus_write_reg(MENELAUS_INT_MASK2,
				the_menelaus->mask2);
	} else {
		the_menelaus->mask1 &= ~(1 << irq);
		return menelaus_write_reg(MENELAUS_INT_MASK1,
				the_menelaus->mask1);
	}
}

static int menelaus_disable_irq(int irq)
{
	if (irq > 7) {
		irq -= 8;
		the_menelaus->mask2 |= (1 << irq);
		return menelaus_write_reg(MENELAUS_INT_MASK2,
				the_menelaus->mask2);
	} else {
		the_menelaus->mask1 |= (1 << irq);
		return menelaus_write_reg(MENELAUS_INT_MASK1,
				the_menelaus->mask1);
	}
}

static int menelaus_ack_irq(int irq)
{
	if (irq > 7)
		return menelaus_write_reg(MENELAUS_INT_ACK2, 1 << (irq - 8));
	else
		return menelaus_write_reg(MENELAUS_INT_ACK1, 1 << irq);
}

/* Adds a handler for an interrupt. Does not run in interrupt context */
static int menelaus_add_irq_work(int irq,
		void (*handler)(struct menelaus_chip *))
{
	int ret = 0;

	mutex_lock(&the_menelaus->lock);
	the_menelaus->handlers[irq] = handler;
	ret = menelaus_enable_irq(irq);
	mutex_unlock(&the_menelaus->lock);

	return ret;
}

/* Removes handler for an interrupt */
static int menelaus_remove_irq_work(int irq)
{
	int ret = 0;

	mutex_lock(&the_menelaus->lock);
	ret = menelaus_disable_irq(irq);
	the_menelaus->handlers[irq] = NULL;
	mutex_unlock(&the_menelaus->lock);

	return ret;
}

/*
 * Gets scheduled when a card detect interrupt happens. Note that in some cases
 * this line is wired to card cover switch rather than the card detect switch
 * in each slot. In this case the cards are not seen by menelaus.
 * FIXME: Add handling for D1 too
 */
static void menelaus_mmc_cd_work(struct menelaus_chip *menelaus_hw)
{
	int reg;
	unsigned char card_mask = 0;

	reg = menelaus_read_reg(MENELAUS_MCT_PIN_ST);
	if (reg < 0)
		return;

	if (!(reg & 0x1))
		card_mask |= MCT_PIN_ST_S1_CD_ST;

	if (!(reg & 0x2))
		card_mask |= MCT_PIN_ST_S2_CD_ST;

	if (menelaus_hw->mmc_callback)
		menelaus_hw->mmc_callback(menelaus_hw->mmc_callback_data,
					  card_mask);
}

/*
 * Toggles the MMC slots between open-drain and push-pull mode.
 */
int menelaus_set_mmc_opendrain(int slot, int enable)
{
	int ret, val;

	if (slot != 1 && slot != 2)
		return -EINVAL;
	mutex_lock(&the_menelaus->lock);
	ret = menelaus_read_reg(MENELAUS_MCT_CTRL1);
	if (ret < 0) {
		mutex_unlock(&the_menelaus->lock);
		return ret;
	}
	val = ret;
	if (slot == 1) {
		if (enable)
			val |= MCT_CTRL1_S1_CMD_OD;
		else
			val &= ~MCT_CTRL1_S1_CMD_OD;
	} else {
		if (enable)
			val |= MCT_CTRL1_S2_CMD_OD;
		else
			val &= ~MCT_CTRL1_S2_CMD_OD;
	}
	ret = menelaus_write_reg(MENELAUS_MCT_CTRL1, val);
	mutex_unlock(&the_menelaus->lock);

	return ret;
}
EXPORT_SYMBOL(menelaus_set_mmc_opendrain);

int menelaus_set_slot_sel(int enable)
{
	int ret;

	mutex_lock(&the_menelaus->lock);
	ret = menelaus_read_reg(MENELAUS_GPIO_CTRL);
	if (ret < 0)
		goto out;
	ret |= GPIO2_DIR_INPUT;
	if (enable)
		ret |= GPIO_CTRL_SLOTSELEN;
	else
		ret &= ~GPIO_CTRL_SLOTSELEN;
	ret = menelaus_write_reg(MENELAUS_GPIO_CTRL, ret);
out:
	mutex_unlock(&the_menelaus->lock);
	return ret;
}
EXPORT_SYMBOL(menelaus_set_slot_sel);

int menelaus_set_mmc_slot(int slot, int enable, int power, int cd_en)
{
	int ret, val;

	if (slot != 1 && slot != 2)
		return -EINVAL;
	if (power >= 3)
		return -EINVAL;

	mutex_lock(&the_menelaus->lock);

	ret = menelaus_read_reg(MENELAUS_MCT_CTRL2);
	if (ret < 0)
		goto out;
	val = ret;
	if (slot == 1) {
		if (cd_en)
			val |= MCT_CTRL2_S1CD_BUFEN | MCT_CTRL2_S1CD_DBEN;
		else
			val &= ~(MCT_CTRL2_S1CD_BUFEN | MCT_CTRL2_S1CD_DBEN);
	} else {
		if (cd_en)
			val |= MCT_CTRL2_S2CD_BUFEN | MCT_CTRL2_S2CD_BEN;
		else
			val &= ~(MCT_CTRL2_S2CD_BUFEN | MCT_CTRL2_S2CD_BEN);
	}
	ret = menelaus_write_reg(MENELAUS_MCT_CTRL2, val);
	if (ret < 0)
		goto out;

	ret = menelaus_read_reg(MENELAUS_MCT_CTRL3);
	if (ret < 0)
		goto out;
	val = ret;
	if (slot == 1) {
		if (enable)
			val |= MCT_CTRL3_SLOT1_EN;
		else
			val &= ~MCT_CTRL3_SLOT1_EN;
	} else {
		int b;

		if (enable)
			val |= MCT_CTRL3_SLOT2_EN;
		else
			val &= ~MCT_CTRL3_SLOT2_EN;
		b = menelaus_read_reg(MENELAUS_MCT_CTRL2);
		b &= ~(MCT_CTRL2_VS2_SEL_D0 | MCT_CTRL2_VS2_SEL_D1);
		b |= power;
		ret = menelaus_write_reg(MENELAUS_MCT_CTRL2, b);
		if (ret < 0)
			goto out;
	}
	/* Disable autonomous shutdown */
	val &= ~(MCT_CTRL3_S1_AUTO_EN | MCT_CTRL3_S2_AUTO_EN);
	ret = menelaus_write_reg(MENELAUS_MCT_CTRL3, val);
out:
	mutex_unlock(&the_menelaus->lock);
	return ret;
}
EXPORT_SYMBOL(menelaus_set_mmc_slot);

int menelaus_register_mmc_callback(void (*callback)(void *data, u8 card_mask),
				   void *data)
{
	int ret = 0;

	the_menelaus->mmc_callback_data = data;
	the_menelaus->mmc_callback = callback;
	ret = menelaus_add_irq_work(MENELAUS_MMC_S1CD_IRQ,
				    menelaus_mmc_cd_work);
	if (ret < 0)
		return ret;
	ret = menelaus_add_irq_work(MENELAUS_MMC_S2CD_IRQ,
				    menelaus_mmc_cd_work);
	if (ret < 0)
		return ret;
	ret = menelaus_add_irq_work(MENELAUS_MMC_S1D1_IRQ,
				    menelaus_mmc_cd_work);
	if (ret < 0)
		return ret;
	ret = menelaus_add_irq_work(MENELAUS_MMC_S2D1_IRQ,
				    menelaus_mmc_cd_work);

	return ret;
}
EXPORT_SYMBOL(menelaus_register_mmc_callback);

void menelaus_unregister_mmc_callback(void)
{
	menelaus_remove_irq_work(MENELAUS_MMC_S1CD_IRQ);
	menelaus_remove_irq_work(MENELAUS_MMC_S2CD_IRQ);
	menelaus_remove_irq_work(MENELAUS_MMC_S1D1_IRQ);
	menelaus_remove_irq_work(MENELAUS_MMC_S2D1_IRQ);

	the_menelaus->mmc_callback = NULL;
	the_menelaus->mmc_callback_data = NULL;
}
EXPORT_SYMBOL(menelaus_unregister_mmc_callback);

struct menelaus_vtg {
	const char *name;
	u8 vtg_reg;
	u8 vtg_shift;
	u8 vtg_bits;
	u8 mode_reg;
};

struct menelaus_vtg_value {
	u16 vtg;
	u16 val;
};

static int menelaus_set_voltage(const struct menelaus_vtg *vtg, int mV,
				int vtg_val, int mode)
{
	int val, ret;
	struct i2c_client *c = the_menelaus->client;

	mutex_lock(&the_menelaus->lock);

	ret = menelaus_read_reg(vtg->vtg_reg);
	if (ret < 0)
		goto out;
	val = ret & ~(((1 << vtg->vtg_bits) - 1) << vtg->vtg_shift);
	val |= vtg_val << vtg->vtg_shift;

	dev_dbg(&c->dev, "Setting voltage '%s'"
			 "to %d mV (reg 0x%02x, val 0x%02x)\n",
			vtg->name, mV, vtg->vtg_reg, val);

	ret = menelaus_write_reg(vtg->vtg_reg, val);
	if (ret < 0)
		goto out;
	ret = menelaus_write_reg(vtg->mode_reg, mode);
out:
	mutex_unlock(&the_menelaus->lock);
	if (ret == 0) {
		/* Wait for voltage to stabilize */
		msleep(1);
	}
	return ret;
}

static int menelaus_get_vtg_value(int vtg, const struct menelaus_vtg_value *tbl,
				  int n)
{
	int i;

	for (i = 0; i < n; i++, tbl++)
		if (tbl->vtg == vtg)
			return tbl->val;
	return -EINVAL;
}

/*
 * Vcore can be programmed in two ways:
 * SW-controlled: Required voltage is programmed into VCORE_CTRL1
 * HW-controlled: Required range (roof-floor) is programmed into VCORE_CTRL3
 * and VCORE_CTRL4
 *
 * Call correct 'set' function accordingly
 */

static const struct menelaus_vtg_value vcore_values[] = {
	{ 1000, 0 },
	{ 1025, 1 },
	{ 1050, 2 },
	{ 1075, 3 },
	{ 1100, 4 },
	{ 1125, 5 },
	{ 1150, 6 },
	{ 1175, 7 },
	{ 1200, 8 },
	{ 1225, 9 },
	{ 1250, 10 },
	{ 1275, 11 },
	{ 1300, 12 },
	{ 1325, 13 },
	{ 1350, 14 },
	{ 1375, 15 },
	{ 1400, 16 },
	{ 1425, 17 },
	{ 1450, 18 },
};

int menelaus_set_vcore_hw(unsigned int roof_mV, unsigned int floor_mV)
{
	int fval, rval, val, ret;
	struct i2c_client *c = the_menelaus->client;

	rval = menelaus_get_vtg_value(roof_mV, vcore_values,
				      ARRAY_SIZE(vcore_values));
	if (rval < 0)
		return -EINVAL;
	fval = menelaus_get_vtg_value(floor_mV, vcore_values,
				      ARRAY_SIZE(vcore_values));
	if (fval < 0)
		return -EINVAL;

	dev_dbg(&c->dev, "Setting VCORE FLOOR to %d mV and ROOF to %d mV\n",
	       floor_mV, roof_mV);

	mutex_lock(&the_menelaus->lock);
	ret = menelaus_write_reg(MENELAUS_VCORE_CTRL3, fval);
	if (ret < 0)
		goto out;
	ret = menelaus_write_reg(MENELAUS_VCORE_CTRL4, rval);
	if (ret < 0)
		goto out;
	if (!the_menelaus->vcore_hw_mode) {
		val = menelaus_read_reg(MENELAUS_VCORE_CTRL1);
		/* HW mode, turn OFF byte comparator */
		val |= (VCORE_CTRL1_HW_NSW | VCORE_CTRL1_BYP_COMP);
		ret = menelaus_write_reg(MENELAUS_VCORE_CTRL1, val);
		the_menelaus->vcore_hw_mode = 1;
	}
	msleep(1);
out:
	mutex_unlock(&the_menelaus->lock);
	return ret;
}

static const struct menelaus_vtg vmem_vtg = {
	.name = "VMEM",
	.vtg_reg = MENELAUS_LDO_CTRL1,
	.vtg_shift = 0,
	.vtg_bits = 2,
	.mode_reg = MENELAUS_LDO_CTRL3,
};

static const struct menelaus_vtg_value vmem_values[] = {
	{ 1500, 0 },
	{ 1800, 1 },
	{ 1900, 2 },
	{ 2500, 3 },
};

int menelaus_set_vmem(unsigned int mV)
{
	int val;

	if (mV == 0)
		return menelaus_set_voltage(&vmem_vtg, 0, 0, 0);

	val = menelaus_get_vtg_value(mV, vmem_values, ARRAY_SIZE(vmem_values));
	if (val < 0)
		return -EINVAL;
	return menelaus_set_voltage(&vmem_vtg, mV, val, 0x02);
}
EXPORT_SYMBOL(menelaus_set_vmem);

static const struct menelaus_vtg vio_vtg = {
	.name = "VIO",
	.vtg_reg = MENELAUS_LDO_CTRL1,
	.vtg_shift = 2,
	.vtg_bits = 2,
	.mode_reg = MENELAUS_LDO_CTRL4,
};

static const struct menelaus_vtg_value vio_values[] = {
	{ 1500, 0 },
	{ 1800, 1 },
	{ 2500, 2 },
	{ 2800, 3 },
};

int menelaus_set_vio(unsigned int mV)
{
	int val;

	if (mV == 0)
		return menelaus_set_voltage(&vio_vtg, 0, 0, 0);

	val = menelaus_get_vtg_value(mV, vio_values, ARRAY_SIZE(vio_values));
	if (val < 0)
		return -EINVAL;
	return menelaus_set_voltage(&vio_vtg, mV, val, 0x02);
}
EXPORT_SYMBOL(menelaus_set_vio);

static const struct menelaus_vtg_value vdcdc_values[] = {
	{ 1500, 0 },
	{ 1800, 1 },
	{ 2000, 2 },
	{ 2200, 3 },
	{ 2400, 4 },
	{ 2800, 5 },
	{ 3000, 6 },
	{ 3300, 7 },
};

static const struct menelaus_vtg vdcdc2_vtg = {
	.name = "VDCDC2",
	.vtg_reg = MENELAUS_DCDC_CTRL1,
	.vtg_shift = 0,
	.vtg_bits = 3,
	.mode_reg = MENELAUS_DCDC_CTRL2,
};

static const struct menelaus_vtg vdcdc3_vtg = {
	.name = "VDCDC3",
	.vtg_reg = MENELAUS_DCDC_CTRL1,
	.vtg_shift = 3,
	.vtg_bits = 3,
	.mode_reg = MENELAUS_DCDC_CTRL3,
};

int menelaus_set_vdcdc(int dcdc, unsigned int mV)
{
	const struct menelaus_vtg *vtg;
	int val;

	if (dcdc != 2 && dcdc != 3)
		return -EINVAL;
	if (dcdc == 2)
		vtg = &vdcdc2_vtg;
	else
		vtg = &vdcdc3_vtg;

	if (mV == 0)
		return menelaus_set_voltage(vtg, 0, 0, 0);

	val = menelaus_get_vtg_value(mV, vdcdc_values,
				     ARRAY_SIZE(vdcdc_values));
	if (val < 0)
		return -EINVAL;
	return menelaus_set_voltage(vtg, mV, val, 0x03);
}

static const struct menelaus_vtg_value vmmc_values[] = {
	{ 1850, 0 },
	{ 2800, 1 },
	{ 3000, 2 },
	{ 3100, 3 },
};

static const struct menelaus_vtg vmmc_vtg = {
	.name = "VMMC",
	.vtg_reg = MENELAUS_LDO_CTRL1,
	.vtg_shift = 6,
	.vtg_bits = 2,
	.mode_reg = MENELAUS_LDO_CTRL7,
};

int menelaus_set_vmmc(unsigned int mV)
{
	int val;

	if (mV == 0)
		return menelaus_set_voltage(&vmmc_vtg, 0, 0, 0);

	val = menelaus_get_vtg_value(mV, vmmc_values, ARRAY_SIZE(vmmc_values));
	if (val < 0)
		return -EINVAL;
	return menelaus_set_voltage(&vmmc_vtg, mV, val, 0x02);
}
EXPORT_SYMBOL(menelaus_set_vmmc);


static const struct menelaus_vtg_value vaux_values[] = {
	{ 1500, 0 },
	{ 1800, 1 },
	{ 2500, 2 },
	{ 2800, 3 },
};

static const struct menelaus_vtg vaux_vtg = {
	.name = "VAUX",
	.vtg_reg = MENELAUS_LDO_CTRL1,
	.vtg_shift = 4,
	.vtg_bits = 2,
	.mode_reg = MENELAUS_LDO_CTRL6,
};

int menelaus_set_vaux(unsigned int mV)
{
	int val;

	if (mV == 0)
		return menelaus_set_voltage(&vaux_vtg, 0, 0, 0);

	val = menelaus_get_vtg_value(mV, vaux_values, ARRAY_SIZE(vaux_values));
	if (val < 0)
		return -EINVAL;
	return menelaus_set_voltage(&vaux_vtg, mV, val, 0x02);
}
EXPORT_SYMBOL(menelaus_set_vaux);

int menelaus_get_slot_pin_states(void)
{
	return menelaus_read_reg(MENELAUS_MCT_PIN_ST);
}
EXPORT_SYMBOL(menelaus_get_slot_pin_states);

int menelaus_set_regulator_sleep(int enable, u32 val)
{
	int t, ret;
	struct i2c_client *c = the_menelaus->client;

	mutex_lock(&the_menelaus->lock);
	ret = menelaus_write_reg(MENELAUS_SLEEP_CTRL2, val);
	if (ret < 0)
		goto out;

	dev_dbg(&c->dev, "regulator sleep configuration: %02x\n", val);

	ret = menelaus_read_reg(MENELAUS_GPIO_CTRL);
	if (ret < 0)
		goto out;
	t = (GPIO_CTRL_SLPCTLEN | GPIO3_DIR_INPUT);
	if (enable)
		ret |= t;
	else
		ret &= ~t;
	ret = menelaus_write_reg(MENELAUS_GPIO_CTRL, ret);
out:
	mutex_unlock(&the_menelaus->lock);
	return ret;
}

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

/* Handles Menelaus interrupts. Does not run in interrupt context */
static void menelaus_work(struct work_struct *_menelaus)
{
	struct menelaus_chip *menelaus =
			container_of(_menelaus, struct menelaus_chip, work);
	void (*handler)(struct menelaus_chip *menelaus);

	while (1) {
		unsigned isr;

		isr = (menelaus_read_reg(MENELAUS_INT_STATUS2)
				& ~menelaus->mask2) << 8;
		isr |= menelaus_read_reg(MENELAUS_INT_STATUS1)
				& ~menelaus->mask1;
		if (!isr)
			break;

		while (isr) {
			int irq = fls(isr) - 1;
			isr &= ~(1 << irq);

			mutex_lock(&menelaus->lock);
			menelaus_disable_irq(irq);
			menelaus_ack_irq(irq);
			handler = menelaus->handlers[irq];
			if (handler)
				handler(menelaus);
			menelaus_enable_irq(irq);
			mutex_unlock(&menelaus->lock);
		}
	}
	enable_irq(menelaus->client->irq);
}

/*
 * We cannot use I2C in interrupt context, so we just schedule work.
 */
static irqreturn_t menelaus_irq(int irq, void *_menelaus)
{
	struct menelaus_chip *menelaus = _menelaus;

	disable_irq_nosync(irq);
	(void)schedule_work(&menelaus->work);

	return IRQ_HANDLED;
}

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

/*
 * The RTC needs to be set once, then it runs on backup battery power.
 * It supports alarms, including system wake alarms (from some modes);
 * and 1/second IRQs if requested.
 */
#ifdef CONFIG_RTC_DRV_TWL92330

#define RTC_CTRL_RTC_EN		(1 << 0)
#define RTC_CTRL_AL_EN		(1 << 1)
#define RTC_CTRL_MODE12		(1 << 2)
#define RTC_CTRL_EVERY_MASK	(3 << 3)
#define RTC_CTRL_EVERY_SEC	(0 << 3)
#define RTC_CTRL_EVERY_MIN	(1 << 3)
#define RTC_CTRL_EVERY_HR	(2 << 3)
#define RTC_CTRL_EVERY_DAY	(3 << 3)

#define RTC_UPDATE_EVERY	0x08

#define RTC_HR_PM		(1 << 7)

static void menelaus_to_time(char *regs, struct rtc_time *t)
{
	t->tm_sec = bcd2bin(regs[0]);
	t->tm_min = bcd2bin(regs[1]);
	if (the_menelaus->rtc_control & RTC_CTRL_MODE12) {
		t->tm_hour = bcd2bin(regs[2] & 0x1f) - 1;
		if (regs[2] & RTC_HR_PM)
			t->tm_hour += 12;
	} else
		t->tm_hour = bcd2bin(regs[2] & 0x3f);
	t->tm_mday = bcd2bin(regs[3]);
	t->tm_mon = bcd2bin(regs[4]) - 1;
	t->tm_year = bcd2bin(regs[5]) + 100;
}

static int time_to_menelaus(struct rtc_time *t, int regnum)
{
	int	hour, status;

	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_sec));
	if (status < 0)
		goto fail;

	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_min));
	if (status < 0)
		goto fail;

	if (the_menelaus->rtc_control & RTC_CTRL_MODE12) {
		hour = t->tm_hour + 1;
		if (hour > 12)
			hour = RTC_HR_PM | bin2bcd(hour - 12);
		else
			hour = bin2bcd(hour);
	} else
		hour = bin2bcd(t->tm_hour);
	status = menelaus_write_reg(regnum++, hour);
	if (status < 0)
		goto fail;

	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_mday));
	if (status < 0)
		goto fail;

	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_mon + 1));
	if (status < 0)
		goto fail;

	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_year - 100));
	if (status < 0)
		goto fail;

	return 0;
fail:
	dev_err(&the_menelaus->client->dev, "rtc write reg %02x, err %d\n",
			--regnum, status);
	return status;
}

static int menelaus_read_time(struct device *dev, struct rtc_time *t)
{
	struct i2c_msg	msg[2];
	char		regs[7];
	int		status;

	/* block read date and time registers */
	regs[0] = MENELAUS_RTC_SEC;

	msg[0].addr = MENELAUS_I2C_ADDRESS;
	msg[0].flags = 0;
	msg[0].len = 1;
	msg[0].buf = regs;

	msg[1].addr = MENELAUS_I2C_ADDRESS;
	msg[1].flags = I2C_M_RD;
	msg[1].len = sizeof(regs);
	msg[1].buf = regs;

	status = i2c_transfer(the_menelaus->client->adapter, msg, 2);
	if (status != 2) {
		dev_err(dev, "%s error %d\n", "read", status);
		return -EIO;
	}

	menelaus_to_time(regs, t);
	t->tm_wday = bcd2bin(regs[6]);

	return 0;
}

static int menelaus_set_time(struct device *dev, struct rtc_time *t)
{
	int		status;

	/* write date and time registers */
	status = time_to_menelaus(t, MENELAUS_RTC_SEC);
	if (status < 0)
		return status;
	status = menelaus_write_reg(MENELAUS_RTC_WKDAY, bin2bcd(t->tm_wday));
	if (status < 0) {
		dev_err(&the_menelaus->client->dev, "rtc write reg %02x "
				"err %d\n", MENELAUS_RTC_WKDAY, status);
		return status;
	}

	/* now commit the write */
	status = menelaus_write_reg(MENELAUS_RTC_UPDATE, RTC_UPDATE_EVERY);
	if (status < 0)
		dev_err(&the_menelaus->client->dev, "rtc commit time, err %d\n",
				status);

	return 0;
}

static int menelaus_read_alarm(struct device *dev, struct rtc_wkalrm *w)
{
	struct i2c_msg	msg[2];
	char		regs[6];
	int		status;

	/* block read alarm registers */
	regs[0] = MENELAUS_RTC_AL_SEC;

	msg[0].addr = MENELAUS_I2C_ADDRESS;
	msg[0].flags = 0;
	msg[0].len = 1;
	msg[0].buf = regs;

	msg[1].addr = MENELAUS_I2C_ADDRESS;
	msg[1].flags = I2C_M_RD;
	msg[1].len = sizeof(regs);
	msg[1].buf = regs;

	status = i2c_transfer(the_menelaus->client->adapter, msg, 2);
	if (status != 2) {
		dev_err(dev, "%s error %d\n", "alarm read", status);
		return -EIO;
	}

	menelaus_to_time(regs, &w->time);

	w->enabled = !!(the_menelaus->rtc_control & RTC_CTRL_AL_EN);

	/* NOTE we *could* check if actually pending... */
	w->pending = 0;

	return 0;
}

static int menelaus_set_alarm(struct device *dev, struct rtc_wkalrm *w)
{
	int		status;

	if (the_menelaus->client->irq <= 0 && w->enabled)
		return -ENODEV;

	/* clear previous alarm enable */
	if (the_menelaus->rtc_control & RTC_CTRL_AL_EN) {
		the_menelaus->rtc_control &= ~RTC_CTRL_AL_EN;
		status = menelaus_write_reg(MENELAUS_RTC_CTRL,
				the_menelaus->rtc_control);
		if (status < 0)
			return status;
	}

	/* write alarm registers */
	status = time_to_menelaus(&w->time, MENELAUS_RTC_AL_SEC);
	if (status < 0)
		return status;

	/* enable alarm if requested */
	if (w->enabled) {
		the_menelaus->rtc_control |= RTC_CTRL_AL_EN;
		status = menelaus_write_reg(MENELAUS_RTC_CTRL,
				the_menelaus->rtc_control);
	}

	return status;
}

#ifdef CONFIG_RTC_INTF_DEV

static void menelaus_rtc_update_work(struct menelaus_chip *m)
{
	/* report 1/sec update */
	rtc_update_irq(m->rtc, 1, RTC_IRQF | RTC_UF);
}

static int menelaus_ioctl(struct device *dev, unsigned cmd, unsigned long arg)
{
	int	status;

	if (the_menelaus->client->irq <= 0)
		return -ENOIOCTLCMD;

	switch (cmd) {
	/* alarm IRQ */
	case RTC_AIE_ON:
		if (the_menelaus->rtc_control & RTC_CTRL_AL_EN)
			return 0;
		the_menelaus->rtc_control |= RTC_CTRL_AL_EN;
		break;
	case RTC_AIE_OFF:
		if (!(the_menelaus->rtc_control & RTC_CTRL_AL_EN))
			return 0;
		the_menelaus->rtc_control &= ~RTC_CTRL_AL_EN;
		break;
	/* 1/second "update" IRQ */
	case RTC_UIE_ON:
		if (the_menelaus->uie)
			return 0;
		status = menelaus_remove_irq_work(MENELAUS_RTCTMR_IRQ);
		status = menelaus_add_irq_work(MENELAUS_RTCTMR_IRQ,
				menelaus_rtc_update_work);
		if (status == 0)
			the_menelaus->uie = 1;
		return status;
	case RTC_UIE_OFF:
		if (!the_menelaus->uie)
			return 0;
		status = menelaus_remove_irq_work(MENELAUS_RTCTMR_IRQ);
		if (status == 0)
			the_menelaus->uie = 0;
		return status;
	default:
		return -ENOIOCTLCMD;
	}
	return menelaus_write_reg(MENELAUS_RTC_CTRL, the_menelaus->rtc_control);
}

#else
#define menelaus_ioctl	NULL
#endif

/* REVISIT no compensation register support ... */

static const struct rtc_class_ops menelaus_rtc_ops = {
	.ioctl			= menelaus_ioctl,
	.read_time		= menelaus_read_time,
	.set_time		= menelaus_set_time,
	.read_alarm		= menelaus_read_alarm,
	.set_alarm		= menelaus_set_alarm,
};

static void menelaus_rtc_alarm_work(struct menelaus_chip *m)
{
	/* report alarm */
	rtc_update_irq(m->rtc, 1, RTC_IRQF | RTC_AF);

	/* then disable it; alarms are oneshot */
	the_menelaus->rtc_control &= ~RTC_CTRL_AL_EN;
	menelaus_write_reg(MENELAUS_RTC_CTRL, the_menelaus->rtc_control);
}

static inline void menelaus_rtc_init(struct menelaus_chip *m)
{
	int	alarm = (m->client->irq > 0);

	/* assume 32KDETEN pin is pulled high */
	if (!(menelaus_read_reg(MENELAUS_OSC_CTRL) & 0x80)) {
		dev_dbg(&m->client->dev, "no 32k oscillator\n");
		return;
	}

	/* support RTC alarm; it can issue wakeups */
	if (alarm) {
		if (menelaus_add_irq_work(MENELAUS_RTCALM_IRQ,
				menelaus_rtc_alarm_work) < 0) {
			dev_err(&m->client->dev, "can't handle RTC alarm\n");
			return;
		}
		device_init_wakeup(&m->client->dev, 1);
	}

	/* be sure RTC is enabled; allow 1/sec irqs; leave 12hr mode alone */
	m->rtc_control = menelaus_read_reg(MENELAUS_RTC_CTRL);
	if (!(m->rtc_control & RTC_CTRL_RTC_EN)
			|| (m->rtc_control & RTC_CTRL_AL_EN)
			|| (m->rtc_control & RTC_CTRL_EVERY_MASK)) {
		if (!(m->rtc_control & RTC_CTRL_RTC_EN)) {
			dev_warn(&m->client->dev, "rtc clock needs setting\n");
			m->rtc_control |= RTC_CTRL_RTC_EN;
		}
		m->rtc_control &= ~RTC_CTRL_EVERY_MASK;
		m->rtc_control &= ~RTC_CTRL_AL_EN;
		menelaus_write_reg(MENELAUS_RTC_CTRL, m->rtc_control);
	}

	m->rtc = rtc_device_register(DRIVER_NAME,
			&m->client->dev,
			&menelaus_rtc_ops, THIS_MODULE);
	if (IS_ERR(m->rtc)) {
		if (alarm) {
			menelaus_remove_irq_work(MENELAUS_RTCALM_IRQ);
			device_init_wakeup(&m->client->dev, 0);
		}
		dev_err(&m->client->dev, "can't register RTC: %d\n",
				(int) PTR_ERR(m->rtc));
		the_menelaus->rtc = NULL;
	}
}

#else

static inline void menelaus_rtc_init(struct menelaus_chip *m)
{
	/* nothing */
}

#endif

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

static struct i2c_driver menelaus_i2c_driver;

static int menelaus_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct menelaus_chip	*menelaus;
	int			rev = 0;
	int			err = 0;
	struct menelaus_platform_data *menelaus_pdata =
					dev_get_platdata(&client->dev);

	if (the_menelaus) {
		dev_dbg(&client->dev, "only one %s for now\n",
				DRIVER_NAME);
		return -ENODEV;
	}

	menelaus = devm_kzalloc(&client->dev, sizeof(*menelaus), GFP_KERNEL);
	if (!menelaus)
		return -ENOMEM;

	i2c_set_clientdata(client, menelaus);

	the_menelaus = menelaus;
	menelaus->client = client;

	/* If a true probe check the device */
	rev = menelaus_read_reg(MENELAUS_REV);
	if (rev < 0) {
		pr_err(DRIVER_NAME ": device not found");
		return -ENODEV;
	}

	/* Ack and disable all Menelaus interrupts */
	menelaus_write_reg(MENELAUS_INT_ACK1, 0xff);
	menelaus_write_reg(MENELAUS_INT_ACK2, 0xff);
	menelaus_write_reg(MENELAUS_INT_MASK1, 0xff);
	menelaus_write_reg(MENELAUS_INT_MASK2, 0xff);
	menelaus->mask1 = 0xff;
	menelaus->mask2 = 0xff;

	/* Set output buffer strengths */
	menelaus_write_reg(MENELAUS_MCT_CTRL1, 0x73);

	if (client->irq > 0) {
		err = request_irq(client->irq, menelaus_irq, 0,
				  DRIVER_NAME, menelaus);
		if (err) {
			dev_dbg(&client->dev,  "can't get IRQ %d, err %d\n",
					client->irq, err);
			return err;
		}
	}

	mutex_init(&menelaus->lock);
	INIT_WORK(&menelaus->work, menelaus_work);

	pr_info("Menelaus rev %d.%d\n", rev >> 4, rev & 0x0f);

	err = menelaus_read_reg(MENELAUS_VCORE_CTRL1);
	if (err < 0)
		goto fail;
	if (err & VCORE_CTRL1_HW_NSW)
		menelaus->vcore_hw_mode = 1;
	else
		menelaus->vcore_hw_mode = 0;

	if (menelaus_pdata != NULL && menelaus_pdata->late_init != NULL) {
		err = menelaus_pdata->late_init(&client->dev);
		if (err < 0)
			goto fail;
	}

	menelaus_rtc_init(menelaus);

	return 0;
fail:
	free_irq(client->irq, menelaus);
	flush_work(&menelaus->work);
	return err;
}

static int menelaus_remove(struct i2c_client *client)
{
	struct menelaus_chip	*menelaus = i2c_get_clientdata(client);

	free_irq(client->irq, menelaus);
	flush_work(&menelaus->work);
	the_menelaus = NULL;
	return 0;
}

static const struct i2c_device_id menelaus_id[] = {
	{ "menelaus", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, menelaus_id);

static struct i2c_driver menelaus_i2c_driver = {
	.driver = {
		.name		= DRIVER_NAME,
	},
	.probe		= menelaus_probe,
	.remove		= menelaus_remove,
	.id_table	= menelaus_id,
};

module_i2c_driver(menelaus_i2c_driver);

MODULE_AUTHOR("Texas Instruments, Inc. (and others)");
MODULE_DESCRIPTION("I2C interface for Menelaus.");
MODULE_LICENSE("GPL");