aboutsummaryrefslogtreecommitdiff
path: root/drivers/regulator/wm831x-ldo.c
blob: aa1f8b3fbe16c7a6e1683b537db9721e77c56b0d (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
/*
 * wm831x-ldo.c  --  LDO driver for the WM831x series
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>

#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/regulator.h>
#include <linux/mfd/wm831x/pdata.h>

#define WM831X_LDO_MAX_NAME 9

#define WM831X_LDO_CONTROL       0
#define WM831X_LDO_ON_CONTROL    1
#define WM831X_LDO_SLEEP_CONTROL 2

#define WM831X_ALIVE_LDO_ON_CONTROL    0
#define WM831X_ALIVE_LDO_SLEEP_CONTROL 1

struct wm831x_ldo {
	char name[WM831X_LDO_MAX_NAME];
	char supply_name[WM831X_LDO_MAX_NAME];
	struct regulator_desc desc;
	int base;
	struct wm831x *wm831x;
	struct regulator_dev *regulator;
};

/*
 * Shared
 */

static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
{
	struct wm831x_ldo *ldo = data;

	regulator_notifier_call_chain(ldo->regulator,
				      REGULATOR_EVENT_UNDER_VOLTAGE,
				      NULL);

	return IRQ_HANDLED;
}

/*
 * General purpose LDOs
 */

#define WM831X_GP_LDO_SELECTOR_LOW 0xe
#define WM831X_GP_LDO_MAX_SELECTOR 0x1f

static int wm831x_gp_ldo_list_voltage(struct regulator_dev *rdev,
				      unsigned int selector)
{
	/* 0.9-1.6V in 50mV steps */
	if (selector <= WM831X_GP_LDO_SELECTOR_LOW)
		return 900000 + (selector * 50000);
	/* 1.7-3.3V in 100mV steps */
	if (selector <= WM831X_GP_LDO_MAX_SELECTOR)
		return 1600000 + ((selector - WM831X_GP_LDO_SELECTOR_LOW)
				  * 100000);
	return -EINVAL;
}

static int wm831x_gp_ldo_set_voltage_int(struct regulator_dev *rdev, int reg,
					 int min_uV, int max_uV,
					 unsigned *selector)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = ldo->wm831x;
	int vsel, ret;

	if (min_uV < 900000)
		vsel = 0;
	else if (min_uV < 1700000)
		vsel = ((min_uV - 900000) / 50000);
	else
		vsel = ((min_uV - 1700000) / 100000)
			+ WM831X_GP_LDO_SELECTOR_LOW + 1;

	ret = wm831x_gp_ldo_list_voltage(rdev, vsel);
	if (ret < 0)
		return ret;
	if (ret < min_uV || ret > max_uV)
		return -EINVAL;

	*selector = vsel;

	return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, vsel);
}

static int wm831x_gp_ldo_set_voltage(struct regulator_dev *rdev,
				     int min_uV, int max_uV,
				     unsigned *selector)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	int reg = ldo->base + WM831X_LDO_ON_CONTROL;

	return wm831x_gp_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
					     selector);
}

static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
					     int uV)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
	unsigned int selector;

	return wm831x_gp_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
}

static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = ldo->wm831x;
	int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
	int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
	int ret;

	ret = wm831x_reg_read(wm831x, on_reg);
	if (ret < 0)
		return ret;

	if (!(ret & WM831X_LDO1_ON_MODE))
		return REGULATOR_MODE_NORMAL;

	ret = wm831x_reg_read(wm831x, ctrl_reg);
	if (ret < 0)
		return ret;

	if (ret & WM831X_LDO1_LP_MODE)
		return REGULATOR_MODE_STANDBY;
	else
		return REGULATOR_MODE_IDLE;
}

static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev,
				  unsigned int mode)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = ldo->wm831x;
	int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
	int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
	int ret;


	switch (mode) {
	case REGULATOR_MODE_NORMAL:
		ret = wm831x_set_bits(wm831x, on_reg,
				      WM831X_LDO1_ON_MODE, 0);
		if (ret < 0)
			return ret;
		break;

	case REGULATOR_MODE_IDLE:
		ret = wm831x_set_bits(wm831x, ctrl_reg,
				      WM831X_LDO1_LP_MODE, 0);
		if (ret < 0)
			return ret;

		ret = wm831x_set_bits(wm831x, on_reg,
				      WM831X_LDO1_ON_MODE,
				      WM831X_LDO1_ON_MODE);
		if (ret < 0)
			return ret;
		break;

	case REGULATOR_MODE_STANDBY:
		ret = wm831x_set_bits(wm831x, ctrl_reg,
				      WM831X_LDO1_LP_MODE,
				      WM831X_LDO1_LP_MODE);
		if (ret < 0)
			return ret;

		ret = wm831x_set_bits(wm831x, on_reg,
				      WM831X_LDO1_ON_MODE,
				      WM831X_LDO1_ON_MODE);
		if (ret < 0)
			return ret;
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = ldo->wm831x;
	int mask = 1 << rdev_get_id(rdev);
	int ret;

	/* Is the regulator on? */
	ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
	if (ret < 0)
		return ret;
	if (!(ret & mask))
		return REGULATOR_STATUS_OFF;

	/* Is it reporting under voltage? */
	ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
	if (ret & mask)
		return REGULATOR_STATUS_ERROR;

	ret = wm831x_gp_ldo_get_mode(rdev);
	if (ret < 0)
		return ret;
	else
		return regulator_mode_to_status(ret);
}

static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev,
						   int input_uV,
						   int output_uV, int load_uA)
{
	if (load_uA < 20000)
		return REGULATOR_MODE_STANDBY;
	if (load_uA < 50000)
		return REGULATOR_MODE_IDLE;
	return REGULATOR_MODE_NORMAL;
}


static struct regulator_ops wm831x_gp_ldo_ops = {
	.list_voltage = wm831x_gp_ldo_list_voltage,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage = wm831x_gp_ldo_set_voltage,
	.set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage,
	.get_mode = wm831x_gp_ldo_get_mode,
	.set_mode = wm831x_gp_ldo_set_mode,
	.get_status = wm831x_gp_ldo_get_status,
	.get_optimum_mode = wm831x_gp_ldo_get_optimum_mode,

	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
};

static __devinit int wm831x_gp_ldo_probe(struct platform_device *pdev)
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
	struct regulator_config config = { };
	int id;
	struct wm831x_ldo *ldo;
	struct resource *res;
	int ret, irq;

	if (pdata && pdata->wm831x_num)
		id = (pdata->wm831x_num * 10) + 1;
	else
		id = 0;
	id = pdev->id - id;

	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
	if (ldo == NULL) {
		dev_err(&pdev->dev, "Unable to allocate private data\n");
		return -ENOMEM;
	}

	ldo->wm831x = wm831x;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "No I/O resource\n");
		ret = -EINVAL;
		goto err;
	}
	ldo->base = res->start;

	snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
	ldo->desc.name = ldo->name;

	snprintf(ldo->supply_name, sizeof(ldo->supply_name),
		 "LDO%dVDD", id + 1);
	ldo->desc.supply_name = ldo->supply_name;

	ldo->desc.id = id;
	ldo->desc.type = REGULATOR_VOLTAGE;
	ldo->desc.n_voltages = WM831X_GP_LDO_MAX_SELECTOR + 1;
	ldo->desc.ops = &wm831x_gp_ldo_ops;
	ldo->desc.owner = THIS_MODULE;
	ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
	ldo->desc.vsel_mask = WM831X_LDO1_ON_VSEL_MASK;
	ldo->desc.enable_reg = WM831X_LDO_ENABLE;
	ldo->desc.enable_mask = 1 << id;

	config.dev = pdev->dev.parent;
	if (pdata)
		config.init_data = pdata->ldo[id];
	config.driver_data = ldo;
	config.regmap = wm831x->regmap;

	ldo->regulator = regulator_register(&ldo->desc, &config);
	if (IS_ERR(ldo->regulator)) {
		ret = PTR_ERR(ldo->regulator);
		dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
			id + 1, ret);
		goto err;
	}

	irq = platform_get_irq_byname(pdev, "UV");
	ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
				   IRQF_TRIGGER_RISING, ldo->name,
				   ldo);
	if (ret != 0) {
		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
			irq, ret);
		goto err_regulator;
	}

	platform_set_drvdata(pdev, ldo);

	return 0;

err_regulator:
	regulator_unregister(ldo->regulator);
err:
	return ret;
}

static __devexit int wm831x_gp_ldo_remove(struct platform_device *pdev)
{
	struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);

	free_irq(platform_get_irq_byname(pdev, "UV"), ldo);
	regulator_unregister(ldo->regulator);

	return 0;
}

static struct platform_driver wm831x_gp_ldo_driver = {
	.probe = wm831x_gp_ldo_probe,
	.remove = __devexit_p(wm831x_gp_ldo_remove),
	.driver		= {
		.name	= "wm831x-ldo",
		.owner	= THIS_MODULE,
	},
};

/*
 * Analogue LDOs
 */


#define WM831X_ALDO_SELECTOR_LOW 0xc
#define WM831X_ALDO_MAX_SELECTOR 0x1f

static int wm831x_aldo_list_voltage(struct regulator_dev *rdev,
				      unsigned int selector)
{
	/* 1-1.6V in 50mV steps */
	if (selector <= WM831X_ALDO_SELECTOR_LOW)
		return 1000000 + (selector * 50000);
	/* 1.7-3.5V in 100mV steps */
	if (selector <= WM831X_ALDO_MAX_SELECTOR)
		return 1600000 + ((selector - WM831X_ALDO_SELECTOR_LOW)
				  * 100000);
	return -EINVAL;
}

static int wm831x_aldo_set_voltage_int(struct regulator_dev *rdev, int reg,
				       int min_uV, int max_uV,
				       unsigned *selector)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = ldo->wm831x;
	int vsel, ret;

	if (min_uV < 1000000)
		vsel = 0;
	else if (min_uV < 1700000)
		vsel = ((min_uV - 1000000) / 50000);
	else
		vsel = ((min_uV - 1700000) / 100000)
			+ WM831X_ALDO_SELECTOR_LOW + 1;

	ret = wm831x_aldo_list_voltage(rdev, vsel);
	if (ret < 0)
		return ret;
	if (ret < min_uV || ret > max_uV)
		return -EINVAL;

	*selector = vsel;

	return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, vsel);
}

static int wm831x_aldo_set_voltage(struct regulator_dev *rdev,
				   int min_uV, int max_uV, unsigned *selector)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	int reg = ldo->base + WM831X_LDO_ON_CONTROL;

	return wm831x_aldo_set_voltage_int(rdev, reg, min_uV, max_uV,
					   selector);
}

static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
					     int uV)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
	unsigned int selector;

	return wm831x_aldo_set_voltage_int(rdev, reg, uV, uV, &selector);
}

static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = ldo->wm831x;
	int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
	int ret;

	ret = wm831x_reg_read(wm831x, on_reg);
	if (ret < 0)
		return 0;

	if (ret & WM831X_LDO7_ON_MODE)
		return REGULATOR_MODE_IDLE;
	else
		return REGULATOR_MODE_NORMAL;
}

static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
				  unsigned int mode)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = ldo->wm831x;
	int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
	int ret;


	switch (mode) {
	case REGULATOR_MODE_NORMAL:
		ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0);
		if (ret < 0)
			return ret;
		break;

	case REGULATOR_MODE_IDLE:
		ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE,
				      WM831X_LDO7_ON_MODE);
		if (ret < 0)
			return ret;
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static int wm831x_aldo_get_status(struct regulator_dev *rdev)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = ldo->wm831x;
	int mask = 1 << rdev_get_id(rdev);
	int ret;

	/* Is the regulator on? */
	ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
	if (ret < 0)
		return ret;
	if (!(ret & mask))
		return REGULATOR_STATUS_OFF;

	/* Is it reporting under voltage? */
	ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
	if (ret & mask)
		return REGULATOR_STATUS_ERROR;

	ret = wm831x_aldo_get_mode(rdev);
	if (ret < 0)
		return ret;
	else
		return regulator_mode_to_status(ret);
}

static struct regulator_ops wm831x_aldo_ops = {
	.list_voltage = wm831x_aldo_list_voltage,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage = wm831x_aldo_set_voltage,
	.set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
	.get_mode = wm831x_aldo_get_mode,
	.set_mode = wm831x_aldo_set_mode,
	.get_status = wm831x_aldo_get_status,

	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
};

static __devinit int wm831x_aldo_probe(struct platform_device *pdev)
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
	struct regulator_config config = { };
	int id;
	struct wm831x_ldo *ldo;
	struct resource *res;
	int ret, irq;

	if (pdata && pdata->wm831x_num)
		id = (pdata->wm831x_num * 10) + 1;
	else
		id = 0;
	id = pdev->id - id;

	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
	if (ldo == NULL) {
		dev_err(&pdev->dev, "Unable to allocate private data\n");
		return -ENOMEM;
	}

	ldo->wm831x = wm831x;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "No I/O resource\n");
		ret = -EINVAL;
		goto err;
	}
	ldo->base = res->start;

	snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
	ldo->desc.name = ldo->name;

	snprintf(ldo->supply_name, sizeof(ldo->supply_name),
		 "LDO%dVDD", id + 1);
	ldo->desc.supply_name = ldo->supply_name;

	ldo->desc.id = id;
	ldo->desc.type = REGULATOR_VOLTAGE;
	ldo->desc.n_voltages = WM831X_ALDO_MAX_SELECTOR + 1;
	ldo->desc.ops = &wm831x_aldo_ops;
	ldo->desc.owner = THIS_MODULE;
	ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
	ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK;
	ldo->desc.enable_reg = WM831X_LDO_ENABLE;
	ldo->desc.enable_mask = 1 << id;

	config.dev = pdev->dev.parent;
	if (pdata)
		config.init_data = pdata->ldo[id];
	config.driver_data = ldo;
	config.regmap = wm831x->regmap;

	ldo->regulator = regulator_register(&ldo->desc, &config);
	if (IS_ERR(ldo->regulator)) {
		ret = PTR_ERR(ldo->regulator);
		dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
			id + 1, ret);
		goto err;
	}

	irq = platform_get_irq_byname(pdev, "UV");
	ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
				   IRQF_TRIGGER_RISING, ldo->name, ldo);
	if (ret != 0) {
		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
			irq, ret);
		goto err_regulator;
	}

	platform_set_drvdata(pdev, ldo);

	return 0;

err_regulator:
	regulator_unregister(ldo->regulator);
err:
	return ret;
}

static __devexit int wm831x_aldo_remove(struct platform_device *pdev)
{
	struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

	free_irq(platform_get_irq_byname(pdev, "UV"), ldo);
	regulator_unregister(ldo->regulator);

	return 0;
}

static struct platform_driver wm831x_aldo_driver = {
	.probe = wm831x_aldo_probe,
	.remove = __devexit_p(wm831x_aldo_remove),
	.driver		= {
		.name	= "wm831x-aldo",
		.owner	= THIS_MODULE,
	},
};

/*
 * Alive LDO
 */

#define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf

static int wm831x_alive_ldo_set_voltage_int(struct regulator_dev *rdev,
					    int reg,
					    int min_uV, int max_uV,
					    unsigned *selector)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = ldo->wm831x;
	int vsel, ret;

	vsel = (min_uV - 800000) / 50000;

	ret = regulator_list_voltage_linear(rdev, vsel);
	if (ret < 0)
		return ret;
	if (ret < min_uV || ret > max_uV)
		return -EINVAL;

	*selector = vsel;

	return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, vsel);
}

static int wm831x_alive_ldo_set_voltage(struct regulator_dev *rdev,
					int min_uV, int max_uV,
					unsigned *selector)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;

	return wm831x_alive_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
						selector);
}

static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
					     int uV)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	int reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
	unsigned selector;

	return wm831x_alive_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
}

static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = ldo->wm831x;
	int mask = 1 << rdev_get_id(rdev);
	int ret;

	/* Is the regulator on? */
	ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
	if (ret < 0)
		return ret;
	if (ret & mask)
		return REGULATOR_STATUS_ON;
	else
		return REGULATOR_STATUS_OFF;
}

static struct regulator_ops wm831x_alive_ldo_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage = wm831x_alive_ldo_set_voltage,
	.set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
	.get_status = wm831x_alive_ldo_get_status,

	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
};

static __devinit int wm831x_alive_ldo_probe(struct platform_device *pdev)
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
	struct regulator_config config = { };
	int id;
	struct wm831x_ldo *ldo;
	struct resource *res;
	int ret;

	if (pdata && pdata->wm831x_num)
		id = (pdata->wm831x_num * 10) + 1;
	else
		id = 0;
	id = pdev->id - id;


	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
	if (ldo == NULL) {
		dev_err(&pdev->dev, "Unable to allocate private data\n");
		return -ENOMEM;
	}

	ldo->wm831x = wm831x;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "No I/O resource\n");
		ret = -EINVAL;
		goto err;
	}
	ldo->base = res->start;

	snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
	ldo->desc.name = ldo->name;

	snprintf(ldo->supply_name, sizeof(ldo->supply_name),
		 "LDO%dVDD", id + 1);
	ldo->desc.supply_name = ldo->supply_name;

	ldo->desc.id = id;
	ldo->desc.type = REGULATOR_VOLTAGE;
	ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
	ldo->desc.ops = &wm831x_alive_ldo_ops;
	ldo->desc.owner = THIS_MODULE;
	ldo->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
	ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK;
	ldo->desc.enable_reg = WM831X_LDO_ENABLE;
	ldo->desc.enable_mask = 1 << id;
	ldo->desc.min_uV = 800000;
	ldo->desc.uV_step = 50000;

	config.dev = pdev->dev.parent;
	if (pdata)
		config.init_data = pdata->ldo[id];
	config.driver_data = ldo;
	config.regmap = wm831x->regmap;

	ldo->regulator = regulator_register(&ldo->desc, &config);
	if (IS_ERR(ldo->regulator)) {
		ret = PTR_ERR(ldo->regulator);
		dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
			id + 1, ret);
		goto err;
	}

	platform_set_drvdata(pdev, ldo);

	return 0;

err:
	return ret;
}

static __devexit int wm831x_alive_ldo_remove(struct platform_device *pdev)
{
	struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

	regulator_unregister(ldo->regulator);

	return 0;
}

static struct platform_driver wm831x_alive_ldo_driver = {
	.probe = wm831x_alive_ldo_probe,
	.remove = __devexit_p(wm831x_alive_ldo_remove),
	.driver		= {
		.name	= "wm831x-alive-ldo",
		.owner	= THIS_MODULE,
	},
};

static int __init wm831x_ldo_init(void)
{
	int ret;

	ret = platform_driver_register(&wm831x_gp_ldo_driver);
	if (ret != 0)
		pr_err("Failed to register WM831x GP LDO driver: %d\n", ret);

	ret = platform_driver_register(&wm831x_aldo_driver);
	if (ret != 0)
		pr_err("Failed to register WM831x ALDO driver: %d\n", ret);

	ret = platform_driver_register(&wm831x_alive_ldo_driver);
	if (ret != 0)
		pr_err("Failed to register WM831x alive LDO driver: %d\n",
		       ret);

	return 0;
}
subsys_initcall(wm831x_ldo_init);

static void __exit wm831x_ldo_exit(void)
{
	platform_driver_unregister(&wm831x_alive_ldo_driver);
	platform_driver_unregister(&wm831x_aldo_driver);
	platform_driver_unregister(&wm831x_gp_ldo_driver);
}
module_exit(wm831x_ldo_exit);

/* Module information */
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("WM831x LDO driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-ldo");
MODULE_ALIAS("platform:wm831x-aldo");
MODULE_ALIAS("platform:wm831x-aliveldo");