summaryrefslogtreecommitdiff
path: root/drivers/rtc/rtc-rv3029c2.c
blob: dc1bda62095e68608b3fd5f3d7ec31c7ec7198e1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Micro Crystal RV-3029 / RV-3049 rtc class driver
 *
 * Author: Gregory Hermant <gregory.hermant@calao-systems.com>
 *         Michael Buesch <m@bues.ch>
 *
 * based on previously existing rtc class drivers
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/spi/spi.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/regmap.h>

/* Register map */
/* control section */
#define RV3029_ONOFF_CTRL		0x00
#define RV3029_ONOFF_CTRL_WE		BIT(0)
#define RV3029_ONOFF_CTRL_TE		BIT(1)
#define RV3029_ONOFF_CTRL_TAR		BIT(2)
#define RV3029_ONOFF_CTRL_EERE		BIT(3)
#define RV3029_ONOFF_CTRL_SRON		BIT(4)
#define RV3029_ONOFF_CTRL_TD0		BIT(5)
#define RV3029_ONOFF_CTRL_TD1		BIT(6)
#define RV3029_ONOFF_CTRL_CLKINT	BIT(7)
#define RV3029_IRQ_CTRL			0x01
#define RV3029_IRQ_CTRL_AIE		BIT(0)
#define RV3029_IRQ_CTRL_TIE		BIT(1)
#define RV3029_IRQ_CTRL_V1IE		BIT(2)
#define RV3029_IRQ_CTRL_V2IE		BIT(3)
#define RV3029_IRQ_CTRL_SRIE		BIT(4)
#define RV3029_IRQ_FLAGS		0x02
#define RV3029_IRQ_FLAGS_AF		BIT(0)
#define RV3029_IRQ_FLAGS_TF		BIT(1)
#define RV3029_IRQ_FLAGS_V1IF		BIT(2)
#define RV3029_IRQ_FLAGS_V2IF		BIT(3)
#define RV3029_IRQ_FLAGS_SRF		BIT(4)
#define RV3029_STATUS			0x03
#define RV3029_STATUS_VLOW1		BIT(2)
#define RV3029_STATUS_VLOW2		BIT(3)
#define RV3029_STATUS_SR		BIT(4)
#define RV3029_STATUS_PON		BIT(5)
#define RV3029_STATUS_EEBUSY		BIT(7)
#define RV3029_RST_CTRL			0x04
#define RV3029_RST_CTRL_SYSR		BIT(4)
#define RV3029_CONTROL_SECTION_LEN	0x05

/* watch section */
#define RV3029_W_SEC			0x08
#define RV3029_W_MINUTES		0x09
#define RV3029_W_HOURS			0x0A
#define RV3029_REG_HR_12_24		BIT(6) /* 24h/12h mode */
#define RV3029_REG_HR_PM		BIT(5) /* PM/AM bit in 12h mode */
#define RV3029_W_DATE			0x0B
#define RV3029_W_DAYS			0x0C
#define RV3029_W_MONTHS			0x0D
#define RV3029_W_YEARS			0x0E
#define RV3029_WATCH_SECTION_LEN	0x07

/* alarm section */
#define RV3029_A_SC			0x10
#define RV3029_A_MN			0x11
#define RV3029_A_HR			0x12
#define RV3029_A_DT			0x13
#define RV3029_A_DW			0x14
#define RV3029_A_MO			0x15
#define RV3029_A_YR			0x16
#define RV3029_A_AE_X			BIT(7)
#define RV3029_ALARM_SECTION_LEN	0x07

/* timer section */
#define RV3029_TIMER_LOW		0x18
#define RV3029_TIMER_HIGH		0x19

/* temperature section */
#define RV3029_TEMP_PAGE		0x20

/* eeprom data section */
#define RV3029_E2P_EEDATA1		0x28
#define RV3029_E2P_EEDATA2		0x29
#define RV3029_E2PDATA_SECTION_LEN	0x02

/* eeprom control section */
#define RV3029_CONTROL_E2P_EECTRL	0x30
#define RV3029_EECTRL_THP		BIT(0) /* temp scan interval */
#define RV3029_EECTRL_THE		BIT(1) /* thermometer enable */
#define RV3029_EECTRL_FD0		BIT(2) /* CLKOUT */
#define RV3029_EECTRL_FD1		BIT(3) /* CLKOUT */
#define RV3029_TRICKLE_1K		BIT(4) /* 1.5K resistance */
#define RV3029_TRICKLE_5K		BIT(5) /* 5K   resistance */
#define RV3029_TRICKLE_20K		BIT(6) /* 20K  resistance */
#define RV3029_TRICKLE_80K		BIT(7) /* 80K  resistance */
#define RV3029_TRICKLE_MASK		(RV3029_TRICKLE_1K |\
					 RV3029_TRICKLE_5K |\
					 RV3029_TRICKLE_20K |\
					 RV3029_TRICKLE_80K)
#define RV3029_TRICKLE_SHIFT		4
#define RV3029_CONTROL_E2P_XOFFS	0x31 /* XTAL offset */
#define RV3029_CONTROL_E2P_XOFFS_SIGN	BIT(7) /* Sign: 1->pos, 0->neg */
#define RV3029_CONTROL_E2P_QCOEF	0x32 /* XTAL temp drift coef */
#define RV3029_CONTROL_E2P_TURNOVER	0x33 /* XTAL turnover temp (in *C) */
#define RV3029_CONTROL_E2P_TOV_MASK	0x3F /* XTAL turnover temp mask */

/* user ram section */
#define RV3029_RAM_PAGE			0x38
#define RV3029_RAM_SECTION_LEN		8

struct rv3029_data {
	struct device		*dev;
	struct rtc_device	*rtc;
	struct regmap		*regmap;
	int irq;
};

static int rv3029_eeprom_busywait(struct rv3029_data *rv3029)
{
	unsigned int sr;
	int i, ret;

	for (i = 100; i > 0; i--) {
		ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
		if (ret < 0)
			break;
		if (!(sr & RV3029_STATUS_EEBUSY))
			break;
		usleep_range(1000, 10000);
	}
	if (i <= 0) {
		dev_err(rv3029->dev, "EEPROM busy wait timeout.\n");
		return -ETIMEDOUT;
	}

	return ret;
}

static int rv3029_eeprom_exit(struct rv3029_data *rv3029)
{
	/* Re-enable eeprom refresh */
	return regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,
				  RV3029_ONOFF_CTRL_EERE,
				  RV3029_ONOFF_CTRL_EERE);
}

static int rv3029_eeprom_enter(struct rv3029_data *rv3029)
{
	unsigned int sr;
	int ret;

	/* Check whether we are in the allowed voltage range. */
	ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
	if (ret < 0)
		return ret;
	if (sr & RV3029_STATUS_VLOW2)
		return -ENODEV;
	if (sr & RV3029_STATUS_VLOW1) {
		/* We clear the bits and retry once just in case
		 * we had a brown out in early startup.
		 */
		ret = regmap_update_bits(rv3029->regmap, RV3029_STATUS,
					 RV3029_STATUS_VLOW1, 0);
		if (ret < 0)
			return ret;
		usleep_range(1000, 10000);
		ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
		if (ret < 0)
			return ret;
		if (sr & RV3029_STATUS_VLOW1) {
			dev_err(rv3029->dev,
				"Supply voltage is too low to safely access the EEPROM.\n");
			return -ENODEV;
		}
	}

	/* Disable eeprom refresh. */
	ret = regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,
				 RV3029_ONOFF_CTRL_EERE, 0);
	if (ret < 0)
		return ret;

	/* Wait for any previous eeprom accesses to finish. */
	ret = rv3029_eeprom_busywait(rv3029);
	if (ret < 0)
		rv3029_eeprom_exit(rv3029);

	return ret;
}

static int rv3029_eeprom_read(struct rv3029_data *rv3029, u8 reg,
			      u8 buf[], size_t len)
{
	int ret, err;

	err = rv3029_eeprom_enter(rv3029);
	if (err < 0)
		return err;

	ret = regmap_bulk_read(rv3029->regmap, reg, buf, len);

	err = rv3029_eeprom_exit(rv3029);
	if (err < 0)
		return err;

	return ret;
}

static int rv3029_eeprom_write(struct rv3029_data *rv3029, u8 reg,
			       u8 const buf[], size_t len)
{
	unsigned int tmp;
	int ret, err;
	size_t i;

	err = rv3029_eeprom_enter(rv3029);
	if (err < 0)
		return err;

	for (i = 0; i < len; i++, reg++) {
		ret = regmap_read(rv3029->regmap, reg, &tmp);
		if (ret < 0)
			break;
		if (tmp != buf[i]) {
			tmp = buf[i];
			ret = regmap_write(rv3029->regmap, reg, tmp);
			if (ret < 0)
				break;
		}
		ret = rv3029_eeprom_busywait(rv3029);
		if (ret < 0)
			break;
	}

	err = rv3029_eeprom_exit(rv3029);
	if (err < 0)
		return err;

	return ret;
}

static int rv3029_eeprom_update_bits(struct rv3029_data *rv3029,
				     u8 reg, u8 mask, u8 set)
{
	u8 buf;
	int ret;

	ret = rv3029_eeprom_read(rv3029, reg, &buf, 1);
	if (ret < 0)
		return ret;
	buf &= ~mask;
	buf |= set & mask;
	ret = rv3029_eeprom_write(rv3029, reg, &buf, 1);
	if (ret < 0)
		return ret;

	return 0;
}

static irqreturn_t rv3029_handle_irq(int irq, void *dev_id)
{
	struct device *dev = dev_id;
	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
	struct mutex *lock = &rv3029->rtc->ops_lock;
	unsigned int flags, controls;
	unsigned long events = 0;
	int ret;

	mutex_lock(lock);

	ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
	if (ret) {
		dev_warn(dev, "Read IRQ Control Register error %d\n", ret);
		mutex_unlock(lock);
		return IRQ_NONE;
	}

	ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);
	if (ret) {
		dev_warn(dev, "Read IRQ Flags Register error %d\n", ret);
		mutex_unlock(lock);
		return IRQ_NONE;
	}

	if (flags & RV3029_IRQ_FLAGS_AF) {
		flags &= ~RV3029_IRQ_FLAGS_AF;
		controls &= ~RV3029_IRQ_CTRL_AIE;
		events |= RTC_AF;
	}

	if (events) {
		rtc_update_irq(rv3029->rtc, 1, events);
		regmap_write(rv3029->regmap, RV3029_IRQ_FLAGS, flags);
		regmap_write(rv3029->regmap, RV3029_IRQ_CTRL, controls);
	}
	mutex_unlock(lock);

	return IRQ_HANDLED;
}

static int rv3029_read_time(struct device *dev, struct rtc_time *tm)
{
	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
	unsigned int sr;
	int ret;
	u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, };

	ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
	if (ret < 0)
		return ret;

	if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON))
		return -EINVAL;

	ret = regmap_bulk_read(rv3029->regmap, RV3029_W_SEC, regs,
			       RV3029_WATCH_SECTION_LEN);
	if (ret < 0)
		return ret;

	tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]);
	tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]);

	/* HR field has a more complex interpretation */
	{
		const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC];

		if (_hr & RV3029_REG_HR_12_24) {
			/* 12h format */
			tm->tm_hour = bcd2bin(_hr & 0x1f);
			if (_hr & RV3029_REG_HR_PM)	/* PM flag set */
				tm->tm_hour += 12;
		} else /* 24h format */
			tm->tm_hour = bcd2bin(_hr & 0x3f);
	}

	tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]);
	tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1;
	tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 100;
	tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1;

	return 0;
}

static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
	struct rtc_time *const tm = &alarm->time;
	unsigned int controls, flags;
	int ret;
	u8 regs[8];

	ret = regmap_bulk_read(rv3029->regmap, RV3029_A_SC, regs,
			       RV3029_ALARM_SECTION_LEN);
	if (ret < 0)
		return ret;

	ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
	if (ret)
		return ret;

	ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);
	if (ret < 0)
		return ret;

	tm->tm_sec = bcd2bin(regs[RV3029_A_SC - RV3029_A_SC] & 0x7f);
	tm->tm_min = bcd2bin(regs[RV3029_A_MN - RV3029_A_SC] & 0x7f);
	tm->tm_hour = bcd2bin(regs[RV3029_A_HR - RV3029_A_SC] & 0x3f);
	tm->tm_mday = bcd2bin(regs[RV3029_A_DT - RV3029_A_SC] & 0x3f);
	tm->tm_mon = bcd2bin(regs[RV3029_A_MO - RV3029_A_SC] & 0x1f) - 1;
	tm->tm_year = bcd2bin(regs[RV3029_A_YR - RV3029_A_SC] & 0x7f) + 100;
	tm->tm_wday = bcd2bin(regs[RV3029_A_DW - RV3029_A_SC] & 0x07) - 1;

	alarm->enabled = !!(controls & RV3029_IRQ_CTRL_AIE);
	alarm->pending = (flags & RV3029_IRQ_FLAGS_AF) && alarm->enabled;

	return 0;
}

static int rv3029_alarm_irq_enable(struct device *dev, unsigned int enable)
{
	struct rv3029_data *rv3029 = dev_get_drvdata(dev);

	return regmap_update_bits(rv3029->regmap, RV3029_IRQ_CTRL,
				  RV3029_IRQ_CTRL_AIE,
				  enable ? RV3029_IRQ_CTRL_AIE : 0);
}

static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
	struct rtc_time *const tm = &alarm->time;
	int ret;
	u8 regs[8];

	/* Activate all the alarms with AE_x bit */
	regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X;
	regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X;
	regs[RV3029_A_HR - RV3029_A_SC] = (bin2bcd(tm->tm_hour) & 0x3f)
		| RV3029_A_AE_X;
	regs[RV3029_A_DT - RV3029_A_SC] = (bin2bcd(tm->tm_mday) & 0x3f)
		| RV3029_A_AE_X;
	regs[RV3029_A_MO - RV3029_A_SC] = (bin2bcd(tm->tm_mon + 1) & 0x1f)
		| RV3029_A_AE_X;
	regs[RV3029_A_DW - RV3029_A_SC] = (bin2bcd(tm->tm_wday + 1) & 0x7)
		| RV3029_A_AE_X;
	regs[RV3029_A_YR - RV3029_A_SC] = (bin2bcd(tm->tm_year - 100))
		| RV3029_A_AE_X;

	/* Write the alarm */
	ret = regmap_bulk_write(rv3029->regmap, RV3029_A_SC, regs,
				RV3029_ALARM_SECTION_LEN);
	if (ret < 0)
		return ret;

	return rv3029_alarm_irq_enable(dev, alarm->enabled);
}

static int rv3029_set_time(struct device *dev, struct rtc_time *tm)
{
	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
	u8 regs[8];
	int ret;

	regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);
	regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);
	regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);
	regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);
	regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);
	regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;
	regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 100);

	ret = regmap_bulk_write(rv3029->regmap, RV3029_W_SEC, regs,
				RV3029_WATCH_SECTION_LEN);
	if (ret < 0)
		return ret;

	/* clear PON and VLOW2 bits */
	return regmap_update_bits(rv3029->regmap, RV3029_STATUS,
				  RV3029_STATUS_PON | RV3029_STATUS_VLOW2, 0);
}

static int rv3029_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
	unsigned long vl = 0;
	int sr, ret = 0;

	switch (cmd) {
	case RTC_VL_READ:
		ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
		if (ret < 0)
			return ret;

		if (sr & RV3029_STATUS_VLOW1)
			vl = RTC_VL_ACCURACY_LOW;

		if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON))
			vl |= RTC_VL_DATA_INVALID;

		return put_user(vl, (unsigned int __user *)arg);

	case RTC_VL_CLR:
		return regmap_update_bits(rv3029->regmap, RV3029_STATUS,
					  RV3029_STATUS_VLOW1, 0);

	default:
		return -ENOIOCTLCMD;
	}
}

static int rv3029_nvram_write(void *priv, unsigned int offset, void *val,
			      size_t bytes)
{
	return regmap_bulk_write(priv, RV3029_RAM_PAGE + offset, val, bytes);
}

static int rv3029_nvram_read(void *priv, unsigned int offset, void *val,
			     size_t bytes)
{
	return regmap_bulk_read(priv, RV3029_RAM_PAGE + offset, val, bytes);
}

static const struct rv3029_trickle_tab_elem {
	u32 r;		/* resistance in ohms */
	u8 conf;	/* trickle config bits */
} rv3029_trickle_tab[] = {
	{
		.r	= 1076,
		.conf	= RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
			  RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
	}, {
		.r	= 1091,
		.conf	= RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
			  RV3029_TRICKLE_20K,
	}, {
		.r	= 1137,
		.conf	= RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
			  RV3029_TRICKLE_80K,
	}, {
		.r	= 1154,
		.conf	= RV3029_TRICKLE_1K | RV3029_TRICKLE_5K,
	}, {
		.r	= 1371,
		.conf	= RV3029_TRICKLE_1K | RV3029_TRICKLE_20K |
			  RV3029_TRICKLE_80K,
	}, {
		.r	= 1395,
		.conf	= RV3029_TRICKLE_1K | RV3029_TRICKLE_20K,
	}, {
		.r	= 1472,
		.conf	= RV3029_TRICKLE_1K | RV3029_TRICKLE_80K,
	}, {
		.r	= 1500,
		.conf	= RV3029_TRICKLE_1K,
	}, {
		.r	= 3810,
		.conf	= RV3029_TRICKLE_5K | RV3029_TRICKLE_20K |
			  RV3029_TRICKLE_80K,
	}, {
		.r	= 4000,
		.conf	= RV3029_TRICKLE_5K | RV3029_TRICKLE_20K,
	}, {
		.r	= 4706,
		.conf	= RV3029_TRICKLE_5K | RV3029_TRICKLE_80K,
	}, {
		.r	= 5000,
		.conf	= RV3029_TRICKLE_5K,
	}, {
		.r	= 16000,
		.conf	= RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
	}, {
		.r	= 20000,
		.conf	= RV3029_TRICKLE_20K,
	}, {
		.r	= 80000,
		.conf	= RV3029_TRICKLE_80K,
	},
};

static void rv3029_trickle_config(struct device *dev)
{
	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
	struct device_node *of_node = dev->of_node;
	const struct rv3029_trickle_tab_elem *elem;
	int i, err;
	u32 ohms;
	u8 trickle_set_bits;

	if (!of_node)
		return;

	/* Configure the trickle charger. */
	err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms);
	if (err) {
		/* Disable trickle charger. */
		trickle_set_bits = 0;
	} else {
		/* Enable trickle charger. */
		for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) {
			elem = &rv3029_trickle_tab[i];
			if (elem->r >= ohms)
				break;
		}
		trickle_set_bits = elem->conf;
		dev_info(dev,
			 "Trickle charger enabled at %d ohms resistance.\n",
			 elem->r);
	}
	err = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,
					RV3029_TRICKLE_MASK,
					trickle_set_bits);
	if (err < 0)
		dev_err(dev, "Failed to update trickle charger config\n");
}

#ifdef CONFIG_RTC_DRV_RV3029_HWMON

static int rv3029_read_temp(struct rv3029_data *rv3029, int *temp_mC)
{
	unsigned int temp;
	int ret;

	ret = regmap_read(rv3029->regmap, RV3029_TEMP_PAGE, &temp);
	if (ret < 0)
		return ret;

	*temp_mC = ((int)temp - 60) * 1000;

	return 0;
}

static ssize_t rv3029_hwmon_show_temp(struct device *dev,
				      struct device_attribute *attr,
				      char *buf)
{
	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
	int ret, temp_mC;

	ret = rv3029_read_temp(rv3029, &temp_mC);
	if (ret < 0)
		return ret;

	return sprintf(buf, "%d\n", temp_mC);
}

static ssize_t rv3029_hwmon_set_update_interval(struct device *dev,
						struct device_attribute *attr,
						const char *buf,
						size_t count)
{
	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
	unsigned int th_set_bits = 0;
	unsigned long interval_ms;
	int ret;

	ret = kstrtoul(buf, 10, &interval_ms);
	if (ret < 0)
		return ret;

	if (interval_ms != 0) {
		th_set_bits |= RV3029_EECTRL_THE;
		if (interval_ms >= 16000)
			th_set_bits |= RV3029_EECTRL_THP;
	}
	ret = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,
					RV3029_EECTRL_THE | RV3029_EECTRL_THP,
					th_set_bits);
	if (ret < 0)
		return ret;

	return count;
}

static ssize_t rv3029_hwmon_show_update_interval(struct device *dev,
						 struct device_attribute *attr,
						 char *buf)
{
	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
	int ret, interval_ms;
	u8 eectrl;

	ret = rv3029_eeprom_read(rv3029, RV3029_CONTROL_E2P_EECTRL,
				 &eectrl, 1);
	if (ret < 0)
		return ret;

	if (eectrl & RV3029_EECTRL_THE) {
		if (eectrl & RV3029_EECTRL_THP)
			interval_ms = 16000;
		else
			interval_ms = 1000;
	} else {
		interval_ms = 0;
	}

	return sprintf(buf, "%d\n", interval_ms);
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp,
			  NULL, 0);
static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
			  rv3029_hwmon_show_update_interval,
			  rv3029_hwmon_set_update_interval, 0);

static struct attribute *rv3029_hwmon_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_update_interval.dev_attr.attr,
	NULL,
};
ATTRIBUTE_GROUPS(rv3029_hwmon);

static void rv3029_hwmon_register(struct device *dev, const char *name)
{
	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
	struct device *hwmon_dev;

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, name, rv3029,
							   rv3029_hwmon_groups);
	if (IS_ERR(hwmon_dev)) {
		dev_warn(dev, "unable to register hwmon device %ld\n",
			 PTR_ERR(hwmon_dev));
	}
}

#else /* CONFIG_RTC_DRV_RV3029_HWMON */

static void rv3029_hwmon_register(struct device *dev, const char *name)
{
}

#endif /* CONFIG_RTC_DRV_RV3029_HWMON */

static struct rtc_class_ops rv3029_rtc_ops = {
	.read_time	= rv3029_read_time,
	.set_time	= rv3029_set_time,
	.ioctl		= rv3029_ioctl,
};

static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
			const char *name)
{
	struct rv3029_data *rv3029;
	struct nvmem_config nvmem_cfg = {
		.name = "rv3029_nvram",
		.word_size = 1,
		.stride = 1,
		.size = RV3029_RAM_SECTION_LEN,
		.type = NVMEM_TYPE_BATTERY_BACKED,
		.reg_read = rv3029_nvram_read,
		.reg_write = rv3029_nvram_write,
	};
	int rc = 0;

	rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL);
	if (!rv3029)
		return -ENOMEM;

	rv3029->regmap = regmap;
	rv3029->irq = irq;
	rv3029->dev = dev;
	dev_set_drvdata(dev, rv3029);

	rv3029_trickle_config(dev);
	rv3029_hwmon_register(dev, name);

	rv3029->rtc = devm_rtc_allocate_device(dev);
	if (IS_ERR(rv3029->rtc))
		return PTR_ERR(rv3029->rtc);

	if (rv3029->irq > 0) {
		rc = devm_request_threaded_irq(dev, rv3029->irq,
					       NULL, rv3029_handle_irq,
					       IRQF_TRIGGER_LOW | IRQF_ONESHOT,
					       "rv3029", dev);
		if (rc) {
			dev_warn(dev, "unable to request IRQ, alarms disabled\n");
			rv3029->irq = 0;
		} else {
			rv3029_rtc_ops.read_alarm = rv3029_read_alarm;
			rv3029_rtc_ops.set_alarm = rv3029_set_alarm;
			rv3029_rtc_ops.alarm_irq_enable = rv3029_alarm_irq_enable;
		}
	}

	rv3029->rtc->ops = &rv3029_rtc_ops;
	rv3029->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
	rv3029->rtc->range_max = RTC_TIMESTAMP_END_2079;

	rc = devm_rtc_register_device(rv3029->rtc);
	if (rc)
		return rc;

	nvmem_cfg.priv = rv3029->regmap;
	devm_rtc_nvmem_register(rv3029->rtc, &nvmem_cfg);

	return 0;
}

static const struct regmap_range rv3029_holes_range[] = {
	regmap_reg_range(0x05, 0x07),
	regmap_reg_range(0x0f, 0x0f),
	regmap_reg_range(0x17, 0x17),
	regmap_reg_range(0x1a, 0x1f),
	regmap_reg_range(0x21, 0x27),
	regmap_reg_range(0x34, 0x37),
};

static const struct regmap_access_table rv3029_regs = {
	.no_ranges =	rv3029_holes_range,
	.n_no_ranges =	ARRAY_SIZE(rv3029_holes_range),
};

static const struct regmap_config config = {
	.reg_bits = 8,
	.val_bits = 8,
	.rd_table = &rv3029_regs,
	.wr_table = &rv3029_regs,
	.max_register = 0x3f,
};

#if IS_ENABLED(CONFIG_I2C)

static int rv3029_i2c_probe(struct i2c_client *client,
			    const struct i2c_device_id *id)
{
	struct regmap *regmap;
	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK |
				     I2C_FUNC_SMBUS_BYTE)) {
		dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n");
		return -ENODEV;
	}

	regmap = devm_regmap_init_i2c(client, &config);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	return rv3029_probe(&client->dev, regmap, client->irq, client->name);
}

static const struct i2c_device_id rv3029_id[] = {
	{ "rv3029", 0 },
	{ "rv3029c2", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, rv3029_id);

static const struct of_device_id rv3029_of_match[] = {
	{ .compatible = "microcrystal,rv3029" },
	{ }
};
MODULE_DEVICE_TABLE(of, rv3029_of_match);

static struct i2c_driver rv3029_driver = {
	.driver = {
		.name = "rv3029",
		.of_match_table = of_match_ptr(rv3029_of_match),
	},
	.probe		= rv3029_i2c_probe,
	.id_table	= rv3029_id,
};

static int __init rv3029_register_driver(void)
{
	return i2c_add_driver(&rv3029_driver);
}

static void rv3029_unregister_driver(void)
{
	i2c_del_driver(&rv3029_driver);
}

#else

static int __init rv3029_register_driver(void)
{
	return 0;
}

static void rv3029_unregister_driver(void)
{
}

#endif

#if IS_ENABLED(CONFIG_SPI_MASTER)

static int rv3049_probe(struct spi_device *spi)
{
	struct regmap *regmap;

	regmap = devm_regmap_init_spi(spi, &config);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	return rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049");
}

static struct spi_driver rv3049_driver = {
	.driver = {
		.name    = "rv3049",
	},
	.probe   = rv3049_probe,
};

static int __init rv3049_register_driver(void)
{
	return spi_register_driver(&rv3049_driver);
}

static void __exit rv3049_unregister_driver(void)
{
	spi_unregister_driver(&rv3049_driver);
}

#else

static int __init rv3049_register_driver(void)
{
	return 0;
}

static void __exit rv3049_unregister_driver(void)
{
}

#endif

static int __init rv30x9_init(void)
{
	int ret;

	ret = rv3029_register_driver();
	if (ret)
		return ret;

	ret = rv3049_register_driver();
	if (ret)
		rv3029_unregister_driver();

	return ret;
}
module_init(rv30x9_init)

static void __exit rv30x9_exit(void)
{
	rv3049_unregister_driver();
	rv3029_unregister_driver();
}
module_exit(rv30x9_exit)

MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
MODULE_AUTHOR("Michael Buesch <m@bues.ch>");
MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:rv3049");