aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/i2c/chips/menelaus.c
blob: 176126d3a01d3054318347cff48dfce8dc2805a1 (plain) (tree)
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










































                                                                          

                         

                          


                                                  







































































































                                                                              
                                                    










                                                                      
                                                   



























































































































































































































































































































































































































































































































































































































































































































































































                                                                                
                                                                         

























































































































































































































                                                                                

                                                         
























                                                                  
                                                         


















                                                                           
                                                                            













































                                                                          





                                                   





                                                    
                                      







                                                   
                                                                     


















                                                                  
/*
 * 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 <asm/mach/irq.h>

#include <mach/gpio.h>
#include <mach/menelaus.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 */

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 |= (1 << 0);

	if (!(reg & 0x2))
		card_mask |= (1 << 1);

	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 |= 1 << 2;
		else
			val &= ~(1 << 2);
	} else {
		if (enable)
			val |= 1 << 3;
		else
			val &= ~(1 << 3);
	}
	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 |= 0x02;
	if (enable)
		ret |= 1 << 5;
	else
		ret &= ~(1 << 5);
	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 |= (1 << 4) | (1 << 6);
		else
			val &= ~((1 << 4) | (1 << 6));
	} else {
		if (cd_en)
			val |= (1 << 5) | (1 << 7);
		else
			val &= ~((1 << 5) | (1 << 7));
	}
	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 |= 1 << 0;
		else
			val &= ~(1 << 0);
	} else {
		int b;

		if (enable)
			ret |= 1 << 1;
		else
			ret &= ~(1 << 1);
		b = menelaus_read_reg(MENELAUS_MCT_CTRL2);
		b &= ~0x03;
		b |= power;
		ret = menelaus_write_reg(MENELAUS_MCT_CTRL2, b);
		if (ret < 0)
			goto out;
	}
	/* Disable autonomous shutdown */
	val &= ~(0x03 << 2);
	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 = 0;
}
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);
	if (vtg == 0)
		goto set_voltage;

	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;
set_voltage:
	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_sw(unsigned int mV)
{
	int val, ret;
	struct i2c_client *c = the_menelaus->client;

	val = menelaus_get_vtg_value(mV, vcore_values,
				     ARRAY_SIZE(vcore_values));
	if (val < 0)
		return -EINVAL;

	dev_dbg(&c->dev, "Setting VCORE to %d mV (val 0x%02x)\n", mV, val);

	/* Set SW mode and the voltage in one go. */
	mutex_lock(&the_menelaus->lock);
	ret = menelaus_write_reg(MENELAUS_VCORE_CTRL1, val);
	if (ret == 0)
		the_menelaus->vcore_hw_mode = 0;
	mutex_unlock(&the_menelaus->lock);
	msleep(1);

	return ret;
}

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 |= ((1 << 7) | (1 << 5));
		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 = ((1 << 6) | 0x04);
	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 */
	local_irq_disable();
	rtc_update_irq(m->rtc, 1, RTC_IRQF | RTC_UF);
	local_irq_enable();
}

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 */
	local_irq_disable();
	rtc_update_irq(m->rtc, 1, RTC_IRQF | RTC_AF);
	local_irq_enable();

	/* 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, val;
	int			err = 0;
	struct menelaus_platform_data *menelaus_pdata =
					client->dev.platform_data;

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

	menelaus = kzalloc(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");
		err = -ENODEV;
		goto fail1;
	}

	/* 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, IRQF_DISABLED,
				  DRIVER_NAME, menelaus);
		if (err) {
			dev_dbg(&client->dev,  "can't get IRQ %d, err %d\n",
					client->irq, err);
			goto fail1;
		}
	}

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

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

	val = menelaus_read_reg(MENELAUS_VCORE_CTRL1);
	if (val < 0)
		goto fail2;
	if (val & (1 << 7))
		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 fail2;
	}

	menelaus_rtc_init(menelaus);

	return 0;
fail2:
	free_irq(client->irq, menelaus);
	flush_scheduled_work();
fail1:
	kfree(menelaus);
	return err;
}

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

	free_irq(client->irq, menelaus);
	kfree(menelaus);
	i2c_set_clientdata(client, NULL);
	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		= __exit_p(menelaus_remove),
	.id_table	= menelaus_id,
};

static int __init menelaus_init(void)
{
	int res;

	res = i2c_add_driver(&menelaus_i2c_driver);
	if (res < 0) {
		pr_err(DRIVER_NAME ": driver registration failed\n");
		return res;
	}

	return 0;
}

static void __exit menelaus_exit(void)
{
	i2c_del_driver(&menelaus_i2c_driver);

	/* FIXME: Shutdown menelaus parts that can be shut down */
}

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

module_init(menelaus_init);
module_exit(menelaus_exit);