summaryrefslogtreecommitdiff
path: root/drivers/regulator/helpers.c
blob: e4bb09bbd3fa6e63d78ba8ab68c2c63d6ac2c25b (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
// SPDX-License-Identifier: GPL-2.0-or-later
//
// helpers.c  --  Voltage/Current Regulator framework helper functions.
//
// Copyright 2007, 2008 Wolfson Microelectronics PLC.
// Copyright 2008 SlimLogic Ltd.

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/driver.h>
#include <linux/module.h>

#include "internal.h"

/**
 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
 *
 * @rdev: regulator to operate on
 *
 * Regulators that use regmap for their register I/O can set the
 * enable_reg and enable_mask fields in their descriptor and then use
 * this as their is_enabled operation, saving some code.
 */
int regulator_is_enabled_regmap(struct regulator_dev *rdev)
{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
	if (ret != 0)
		return ret;

	val &= rdev->desc->enable_mask;

	if (rdev->desc->enable_is_inverted) {
		if (rdev->desc->enable_val)
			return val != rdev->desc->enable_val;
		return val == 0;
	} else {
		if (rdev->desc->enable_val)
			return val == rdev->desc->enable_val;
		return val != 0;
	}
}
EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);

/**
 * regulator_enable_regmap - standard enable() for regmap users
 *
 * @rdev: regulator to operate on
 *
 * Regulators that use regmap for their register I/O can set the
 * enable_reg and enable_mask fields in their descriptor and then use
 * this as their enable() operation, saving some code.
 */
int regulator_enable_regmap(struct regulator_dev *rdev)
{
	unsigned int val;

	if (rdev->desc->enable_is_inverted) {
		val = rdev->desc->disable_val;
	} else {
		val = rdev->desc->enable_val;
		if (!val)
			val = rdev->desc->enable_mask;
	}

	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
				  rdev->desc->enable_mask, val);
}
EXPORT_SYMBOL_GPL(regulator_enable_regmap);

/**
 * regulator_disable_regmap - standard disable() for regmap users
 *
 * @rdev: regulator to operate on
 *
 * Regulators that use regmap for their register I/O can set the
 * enable_reg and enable_mask fields in their descriptor and then use
 * this as their disable() operation, saving some code.
 */
int regulator_disable_regmap(struct regulator_dev *rdev)
{
	unsigned int val;

	if (rdev->desc->enable_is_inverted) {
		val = rdev->desc->enable_val;
		if (!val)
			val = rdev->desc->enable_mask;
	} else {
		val = rdev->desc->disable_val;
	}

	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
				  rdev->desc->enable_mask, val);
}
EXPORT_SYMBOL_GPL(regulator_disable_regmap);

static int regulator_range_selector_to_index(struct regulator_dev *rdev,
					     unsigned int rval)
{
	int i;

	if (!rdev->desc->linear_range_selectors)
		return -EINVAL;

	rval &= rdev->desc->vsel_range_mask;

	for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
		if (rdev->desc->linear_range_selectors[i] == rval)
			return i;
	}
	return -EINVAL;
}

/**
 * regulator_get_voltage_sel_pickable_regmap - pickable range get_voltage_sel
 *
 * @rdev: regulator to operate on
 *
 * Regulators that use regmap for their register I/O and use pickable
 * ranges can set the vsel_reg, vsel_mask, vsel_range_reg and vsel_range_mask
 * fields in their descriptor and then use this as their get_voltage_vsel
 * operation, saving some code.
 */
int regulator_get_voltage_sel_pickable_regmap(struct regulator_dev *rdev)
{
	unsigned int r_val;
	int range;
	unsigned int val;
	int ret;
	unsigned int voltages = 0;
	const struct linear_range *r = rdev->desc->linear_ranges;

	if (!r)
		return -EINVAL;

	ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
	if (ret != 0)
		return ret;

	ret = regmap_read(rdev->regmap, rdev->desc->vsel_range_reg, &r_val);
	if (ret != 0)
		return ret;

	val &= rdev->desc->vsel_mask;
	val >>= ffs(rdev->desc->vsel_mask) - 1;

	range = regulator_range_selector_to_index(rdev, r_val);
	if (range < 0)
		return -EINVAL;

	voltages = linear_range_values_in_range_array(r, range);

	return val + voltages;
}
EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_pickable_regmap);

/**
 * regulator_set_voltage_sel_pickable_regmap - pickable range set_voltage_sel
 *
 * @rdev: regulator to operate on
 * @sel: Selector to set
 *
 * Regulators that use regmap for their register I/O and use pickable
 * ranges can set the vsel_reg, vsel_mask, vsel_range_reg and vsel_range_mask
 * fields in their descriptor and then use this as their set_voltage_vsel
 * operation, saving some code.
 */
int regulator_set_voltage_sel_pickable_regmap(struct regulator_dev *rdev,
					      unsigned int sel)
{
	unsigned int range;
	int ret, i;
	unsigned int voltages_in_range = 0;

	for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
		const struct linear_range *r;

		r = &rdev->desc->linear_ranges[i];
		voltages_in_range = linear_range_values_in_range(r);

		if (sel < voltages_in_range)
			break;
		sel -= voltages_in_range;
	}

	if (i == rdev->desc->n_linear_ranges)
		return -EINVAL;

	sel <<= ffs(rdev->desc->vsel_mask) - 1;
	sel += rdev->desc->linear_ranges[i].min_sel;

	range = rdev->desc->linear_range_selectors[i];

	if (rdev->desc->vsel_reg == rdev->desc->vsel_range_reg) {
		ret = regmap_update_bits(rdev->regmap,
					 rdev->desc->vsel_reg,
					 rdev->desc->vsel_range_mask |
					 rdev->desc->vsel_mask, sel | range);
	} else {
		ret = regmap_update_bits(rdev->regmap,
					 rdev->desc->vsel_range_reg,
					 rdev->desc->vsel_range_mask, range);
		if (ret)
			return ret;

		ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
				  rdev->desc->vsel_mask, sel);
	}

	if (ret)
		return ret;

	if (rdev->desc->apply_bit)
		ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
					 rdev->desc->apply_bit,
					 rdev->desc->apply_bit);
	return ret;
}
EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_pickable_regmap);

/**
 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
 *
 * @rdev: regulator to operate on
 *
 * Regulators that use regmap for their register I/O can set the
 * vsel_reg and vsel_mask fields in their descriptor and then use this
 * as their get_voltage_vsel operation, saving some code.
 */
int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
	if (ret != 0)
		return ret;

	val &= rdev->desc->vsel_mask;
	val >>= ffs(rdev->desc->vsel_mask) - 1;

	return val;
}
EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);

/**
 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
 *
 * @rdev: regulator to operate on
 * @sel: Selector to set
 *
 * Regulators that use regmap for their register I/O can set the
 * vsel_reg and vsel_mask fields in their descriptor and then use this
 * as their set_voltage_vsel operation, saving some code.
 */
int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
{
	int ret;

	sel <<= ffs(rdev->desc->vsel_mask) - 1;

	ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
				  rdev->desc->vsel_mask, sel);
	if (ret)
		return ret;

	if (rdev->desc->apply_bit)
		ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
					 rdev->desc->apply_bit,
					 rdev->desc->apply_bit);
	return ret;
}
EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);

/**
 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
 *
 * @rdev: Regulator to operate on
 * @min_uV: Lower bound for voltage
 * @max_uV: Upper bound for voltage
 *
 * Drivers implementing set_voltage_sel() and list_voltage() can use
 * this as their map_voltage() operation.  It will find a suitable
 * voltage by calling list_voltage() until it gets something in bounds
 * for the requested voltages.
 */
int regulator_map_voltage_iterate(struct regulator_dev *rdev,
				  int min_uV, int max_uV)
{
	int best_val = INT_MAX;
	int selector = 0;
	int i, ret;

	/* Find the smallest voltage that falls within the specified
	 * range.
	 */
	for (i = 0; i < rdev->desc->n_voltages; i++) {
		ret = rdev->desc->ops->list_voltage(rdev, i);
		if (ret < 0)
			continue;

		if (ret < best_val && ret >= min_uV && ret <= max_uV) {
			best_val = ret;
			selector = i;
		}
	}

	if (best_val != INT_MAX)
		return selector;
	else
		return -EINVAL;
}
EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);

/**
 * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list
 *
 * @rdev: Regulator to operate on
 * @min_uV: Lower bound for voltage
 * @max_uV: Upper bound for voltage
 *
 * Drivers that have ascendant voltage list can use this as their
 * map_voltage() operation.
 */
int regulator_map_voltage_ascend(struct regulator_dev *rdev,
				 int min_uV, int max_uV)
{
	int i, ret;

	for (i = 0; i < rdev->desc->n_voltages; i++) {
		ret = rdev->desc->ops->list_voltage(rdev, i);
		if (ret < 0)
			continue;

		if (ret > max_uV)
			break;

		if (ret >= min_uV && ret <= max_uV)
			return i;
	}

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend);

/**
 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
 *
 * @rdev: Regulator to operate on
 * @min_uV: Lower bound for voltage
 * @max_uV: Upper bound for voltage
 *
 * Drivers providing min_uV and uV_step in their regulator_desc can
 * use this as their map_voltage() operation.
 */
int regulator_map_voltage_linear(struct regulator_dev *rdev,
				 int min_uV, int max_uV)
{
	int ret, voltage;

	/* Allow uV_step to be 0 for fixed voltage */
	if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
		if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
			return 0;
		else
			return -EINVAL;
	}

	if (!rdev->desc->uV_step) {
		BUG_ON(!rdev->desc->uV_step);
		return -EINVAL;
	}

	if (min_uV < rdev->desc->min_uV)
		min_uV = rdev->desc->min_uV;

	ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
	if (ret < 0)
		return ret;

	ret += rdev->desc->linear_min_sel;

	/* Map back into a voltage to verify we're still in bounds */
	voltage = rdev->desc->ops->list_voltage(rdev, ret);
	if (voltage < min_uV || voltage > max_uV)
		return -EINVAL;

	return ret;
}
EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);

/**
 * regulator_map_voltage_linear_range - map_voltage() for multiple linear ranges
 *
 * @rdev: Regulator to operate on
 * @min_uV: Lower bound for voltage
 * @max_uV: Upper bound for voltage
 *
 * Drivers providing linear_ranges in their descriptor can use this as
 * their map_voltage() callback.
 */
int regulator_map_voltage_linear_range(struct regulator_dev *rdev,
				       int min_uV, int max_uV)
{
	const struct linear_range *range;
	int ret = -EINVAL;
	unsigned int sel;
	bool found;
	int voltage, i;

	if (!rdev->desc->n_linear_ranges) {
		BUG_ON(!rdev->desc->n_linear_ranges);
		return -EINVAL;
	}

	for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
		range = &rdev->desc->linear_ranges[i];

		ret = linear_range_get_selector_high(range, min_uV, &sel,
						     &found);
		if (ret)
			continue;
		ret = sel;

		/*
		 * Map back into a voltage to verify we're still in bounds.
		 * If we are not, then continue checking rest of the ranges.
		 */
		voltage = rdev->desc->ops->list_voltage(rdev, sel);
		if (voltage >= min_uV && voltage <= max_uV)
			break;
	}

	if (i == rdev->desc->n_linear_ranges)
		return -EINVAL;

	return ret;
}
EXPORT_SYMBOL_GPL(regulator_map_voltage_linear_range);

/**
 * regulator_map_voltage_pickable_linear_range - map_voltage, pickable ranges
 *
 * @rdev: Regulator to operate on
 * @min_uV: Lower bound for voltage
 * @max_uV: Upper bound for voltage
 *
 * Drivers providing pickable linear_ranges in their descriptor can use
 * this as their map_voltage() callback.
 */
int regulator_map_voltage_pickable_linear_range(struct regulator_dev *rdev,
						int min_uV, int max_uV)
{
	const struct linear_range *range;
	int ret = -EINVAL;
	int voltage, i;
	unsigned int selector = 0;

	if (!rdev->desc->n_linear_ranges) {
		BUG_ON(!rdev->desc->n_linear_ranges);
		return -EINVAL;
	}

	for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
		int linear_max_uV;
		bool found;
		unsigned int sel;

		range = &rdev->desc->linear_ranges[i];
		linear_max_uV = linear_range_get_max_value(range);

		if (!(min_uV <= linear_max_uV && max_uV >= range->min)) {
			selector += linear_range_values_in_range(range);
			continue;
		}

		ret = linear_range_get_selector_high(range, min_uV, &sel,
						     &found);
		if (ret) {
			selector += linear_range_values_in_range(range);
			continue;
		}

		ret = selector + sel - range->min_sel;

		voltage = rdev->desc->ops->list_voltage(rdev, ret);

		/*
		 * Map back into a voltage to verify we're still in bounds.
		 * We may have overlapping voltage ranges. Hence we don't
		 * exit but retry until we have checked all ranges.
		 */
		if (voltage < min_uV || voltage > max_uV)
			selector += linear_range_values_in_range(range);
		else
			break;
	}

	if (i == rdev->desc->n_linear_ranges)
		return -EINVAL;

	return ret;
}
EXPORT_SYMBOL_GPL(regulator_map_voltage_pickable_linear_range);

/**
 * regulator_list_voltage_linear - List voltages with simple calculation
 *
 * @rdev: Regulator device
 * @selector: Selector to convert into a voltage
 *
 * Regulators with a simple linear mapping between voltages and
 * selectors can set min_uV and uV_step in the regulator descriptor
 * and then use this function as their list_voltage() operation,
 */
int regulator_list_voltage_linear(struct regulator_dev *rdev,
				  unsigned int selector)
{
	if (selector >= rdev->desc->n_voltages)
		return -EINVAL;
	if (selector < rdev->desc->linear_min_sel)
		return 0;

	selector -= rdev->desc->linear_min_sel;

	return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
}
EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);

/**
 * regulator_list_voltage_pickable_linear_range - pickable range list voltages
 *
 * @rdev: Regulator device
 * @selector: Selector to convert into a voltage
 *
 * list_voltage() operation, intended to be used by drivers utilizing pickable
 * ranges helpers.
 */
int regulator_list_voltage_pickable_linear_range(struct regulator_dev *rdev,
						 unsigned int selector)
{
	const struct linear_range *range;
	int i;
	unsigned int all_sels = 0;

	if (!rdev->desc->n_linear_ranges) {
		BUG_ON(!rdev->desc->n_linear_ranges);
		return -EINVAL;
	}

	for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
		unsigned int sel_indexes;

		range = &rdev->desc->linear_ranges[i];

		sel_indexes = linear_range_values_in_range(range) - 1;

		if (all_sels + sel_indexes >= selector) {
			selector -= all_sels;
			/*
			 * As we see here, pickable ranges work only as
			 * long as the first selector for each pickable
			 * range is 0, and the each subsequent range for
			 * this 'pick' follow immediately at next unused
			 * selector (Eg. there is no gaps between ranges).
			 * I think this is fine but it probably should be
			 * documented. OTOH, whole pickable range stuff
			 * might benefit from some documentation
			 */
			return range->min + (range->step * selector);
		}

		all_sels += (sel_indexes + 1);
	}

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(regulator_list_voltage_pickable_linear_range);

/**
 * regulator_desc_list_voltage_linear_range - List voltages for linear ranges
 *
 * @desc: Regulator desc for regulator which volatges are to be listed
 * @selector: Selector to convert into a voltage
 *
 * Regulators with a series of simple linear mappings between voltages
 * and selectors who have set linear_ranges in the regulator descriptor
 * can use this function prior regulator registration to list voltages.
 * This is useful when voltages need to be listed during device-tree
 * parsing.
 */
int regulator_desc_list_voltage_linear_range(const struct regulator_desc *desc,
					     unsigned int selector)
{
	unsigned int val;
	int ret;

	BUG_ON(!desc->n_linear_ranges);

	ret = linear_range_get_value_array(desc->linear_ranges,
					   desc->n_linear_ranges, selector,
					   &val);
	if (ret)
		return ret;

	return val;
}
EXPORT_SYMBOL_GPL(regulator_desc_list_voltage_linear_range);

/**
 * regulator_list_voltage_linear_range - List voltages for linear ranges
 *
 * @rdev: Regulator device
 * @selector: Selector to convert into a voltage
 *
 * Regulators with a series of simple linear mappings between voltages
 * and selectors can set linear_ranges in the regulator descriptor and
 * then use this function as their list_voltage() operation,
 */
int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
					unsigned int selector)
{
	return regulator_desc_list_voltage_linear_range(rdev->desc, selector);
}
EXPORT_SYMBOL_GPL(regulator_list_voltage_linear_range);

/**
 * regulator_list_voltage_table - List voltages with table based mapping
 *
 * @rdev: Regulator device
 * @selector: Selector to convert into a voltage
 *
 * Regulators with table based mapping between voltages and
 * selectors can set volt_table in the regulator descriptor
 * and then use this function as their list_voltage() operation.
 */
int regulator_list_voltage_table(struct regulator_dev *rdev,
				 unsigned int selector)
{
	if (!rdev->desc->volt_table) {
		BUG_ON(!rdev->desc->volt_table);
		return -EINVAL;
	}

	if (selector >= rdev->desc->n_voltages)
		return -EINVAL;

	return rdev->desc->volt_table[selector];
}
EXPORT_SYMBOL_GPL(regulator_list_voltage_table);

/**
 * regulator_set_bypass_regmap - Default set_bypass() using regmap
 *
 * @rdev: device to operate on.
 * @enable: state to set.
 */
int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
{
	unsigned int val;

	if (enable) {
		val = rdev->desc->bypass_val_on;
		if (!val)
			val = rdev->desc->bypass_mask;
	} else {
		val = rdev->desc->bypass_val_off;
	}

	return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
				  rdev->desc->bypass_mask, val);
}
EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);

/**
 * regulator_set_soft_start_regmap - Default set_soft_start() using regmap
 *
 * @rdev: device to operate on.
 */
int regulator_set_soft_start_regmap(struct regulator_dev *rdev)
{
	unsigned int val;

	val = rdev->desc->soft_start_val_on;
	if (!val)
		val = rdev->desc->soft_start_mask;

	return regmap_update_bits(rdev->regmap, rdev->desc->soft_start_reg,
				  rdev->desc->soft_start_mask, val);
}
EXPORT_SYMBOL_GPL(regulator_set_soft_start_regmap);

/**
 * regulator_set_pull_down_regmap - Default set_pull_down() using regmap
 *
 * @rdev: device to operate on.
 */
int regulator_set_pull_down_regmap(struct regulator_dev *rdev)
{
	unsigned int val;

	val = rdev->desc->pull_down_val_on;
	if (!val)
		val = rdev->desc->pull_down_mask;

	return regmap_update_bits(rdev->regmap, rdev->desc->pull_down_reg,
				  rdev->desc->pull_down_mask, val);
}
EXPORT_SYMBOL_GPL(regulator_set_pull_down_regmap);

/**
 * regulator_get_bypass_regmap - Default get_bypass() using regmap
 *
 * @rdev: device to operate on.
 * @enable: current state.
 */
int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable)
{
	unsigned int val;
	unsigned int val_on = rdev->desc->bypass_val_on;
	int ret;

	ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
	if (ret != 0)
		return ret;

	if (!val_on)
		val_on = rdev->desc->bypass_mask;

	*enable = (val & rdev->desc->bypass_mask) == val_on;

	return 0;
}
EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);

/**
 * regulator_set_active_discharge_regmap - Default set_active_discharge()
 *					   using regmap
 *
 * @rdev: device to operate on.
 * @enable: state to set, 0 to disable and 1 to enable.
 */
int regulator_set_active_discharge_regmap(struct regulator_dev *rdev,
					  bool enable)
{
	unsigned int val;

	if (enable)
		val = rdev->desc->active_discharge_on;
	else
		val = rdev->desc->active_discharge_off;

	return regmap_update_bits(rdev->regmap,
				  rdev->desc->active_discharge_reg,
				  rdev->desc->active_discharge_mask, val);
}
EXPORT_SYMBOL_GPL(regulator_set_active_discharge_regmap);

/**
 * regulator_set_current_limit_regmap - set_current_limit for regmap users
 *
 * @rdev: regulator to operate on
 * @min_uA: Lower bound for current limit
 * @max_uA: Upper bound for current limit
 *
 * Regulators that use regmap for their register I/O can set curr_table,
 * csel_reg and csel_mask fields in their descriptor and then use this
 * as their set_current_limit operation, saving some code.
 */
int regulator_set_current_limit_regmap(struct regulator_dev *rdev,
				       int min_uA, int max_uA)
{
	unsigned int n_currents = rdev->desc->n_current_limits;
	int i, sel = -1;

	if (n_currents == 0)
		return -EINVAL;

	if (rdev->desc->curr_table) {
		const unsigned int *curr_table = rdev->desc->curr_table;
		bool ascend = curr_table[n_currents - 1] > curr_table[0];

		/* search for closest to maximum */
		if (ascend) {
			for (i = n_currents - 1; i >= 0; i--) {
				if (min_uA <= curr_table[i] &&
				    curr_table[i] <= max_uA) {
					sel = i;
					break;
				}
			}
		} else {
			for (i = 0; i < n_currents; i++) {
				if (min_uA <= curr_table[i] &&
				    curr_table[i] <= max_uA) {
					sel = i;
					break;
				}
			}
		}
	}

	if (sel < 0)
		return -EINVAL;

	sel <<= ffs(rdev->desc->csel_mask) - 1;

	return regmap_update_bits(rdev->regmap, rdev->desc->csel_reg,
				  rdev->desc->csel_mask, sel);
}
EXPORT_SYMBOL_GPL(regulator_set_current_limit_regmap);

/**
 * regulator_get_current_limit_regmap - get_current_limit for regmap users
 *
 * @rdev: regulator to operate on
 *
 * Regulators that use regmap for their register I/O can set the
 * csel_reg and csel_mask fields in their descriptor and then use this
 * as their get_current_limit operation, saving some code.
 */
int regulator_get_current_limit_regmap(struct regulator_dev *rdev)
{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, rdev->desc->csel_reg, &val);
	if (ret != 0)
		return ret;

	val &= rdev->desc->csel_mask;
	val >>= ffs(rdev->desc->csel_mask) - 1;

	if (rdev->desc->curr_table) {
		if (val >= rdev->desc->n_current_limits)
			return -EINVAL;

		return rdev->desc->curr_table[val];
	}

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(regulator_get_current_limit_regmap);

/**
 * regulator_bulk_set_supply_names - initialize the 'supply' fields in an array
 *                                   of regulator_bulk_data structs
 *
 * @consumers: array of regulator_bulk_data entries to initialize
 * @supply_names: array of supply name strings
 * @num_supplies: number of supply names to initialize
 *
 * Note: the 'consumers' array must be the size of 'num_supplies'.
 */
void regulator_bulk_set_supply_names(struct regulator_bulk_data *consumers,
				     const char *const *supply_names,
				     unsigned int num_supplies)
{
	unsigned int i;

	for (i = 0; i < num_supplies; i++)
		consumers[i].supply = supply_names[i];
}
EXPORT_SYMBOL_GPL(regulator_bulk_set_supply_names);

/**
 * regulator_is_equal - test whether two regulators are the same
 *
 * @reg1: first regulator to operate on
 * @reg2: second regulator to operate on
 */
bool regulator_is_equal(struct regulator *reg1, struct regulator *reg2)
{
	return reg1->rdev == reg2->rdev;
}
EXPORT_SYMBOL_GPL(regulator_is_equal);