summaryrefslogtreecommitdiff
path: root/drivers/power/supply/wm831x_power.c
blob: d56e499ac59fb19e268cce89e48488fd835cf5a8 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * PMU driver for Wolfson Microelectronics wm831x PMICs
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/usb/phy.h>

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

struct wm831x_power {
	struct wm831x *wm831x;
	struct power_supply *wall;
	struct power_supply *usb;
	struct power_supply *battery;
	struct power_supply_desc wall_desc;
	struct power_supply_desc usb_desc;
	struct power_supply_desc battery_desc;
	char wall_name[20];
	char usb_name[20];
	char battery_name[20];
	bool have_battery;
	struct usb_phy *usb_phy;
	struct notifier_block usb_notify;
};

static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
				     union power_supply_propval *val)
{
	int ret;

	ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
	if (ret < 0)
		return ret;

	if (ret & supply)
		val->intval = 1;
	else
		val->intval = 0;

	return 0;
}

static int wm831x_power_read_voltage(struct wm831x *wm831x,
				     enum wm831x_auxadc src,
				     union power_supply_propval *val)
{
	int ret;

	ret = wm831x_auxadc_read_uv(wm831x, src);
	if (ret >= 0)
		val->intval = ret;

	return ret;
}

/*********************************************************************
 *		WALL Power
 *********************************************************************/
static int wm831x_wall_get_prop(struct power_supply *psy,
				enum power_supply_property psp,
				union power_supply_propval *val)
{
	struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent);
	struct wm831x *wm831x = wm831x_power->wm831x;
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		ret = wm831x_power_check_online(wm831x, WM831X_PWR_WALL, val);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_WALL, val);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static enum power_supply_property wm831x_wall_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
};

/*********************************************************************
 *		USB Power
 *********************************************************************/
static int wm831x_usb_get_prop(struct power_supply *psy,
			       enum power_supply_property psp,
			       union power_supply_propval *val)
{
	struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent);
	struct wm831x *wm831x = wm831x_power->wm831x;
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		ret = wm831x_power_check_online(wm831x, WM831X_PWR_USB, val);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_USB, val);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static enum power_supply_property wm831x_usb_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
};

/* In milliamps */
static const unsigned int wm831x_usb_limits[] = {
	0,
	2,
	100,
	500,
	900,
	1500,
	1800,
	550,
};

static int wm831x_usb_limit_change(struct notifier_block *nb,
				   unsigned long limit, void *data)
{
	struct wm831x_power *wm831x_power = container_of(nb,
							 struct wm831x_power,
							 usb_notify);
	unsigned int i, best;

	/* Find the highest supported limit */
	best = 0;
	for (i = 0; i < ARRAY_SIZE(wm831x_usb_limits); i++) {
		if (limit >= wm831x_usb_limits[i] &&
		    wm831x_usb_limits[best] < wm831x_usb_limits[i])
			best = i;
	}

	dev_dbg(wm831x_power->wm831x->dev,
		"Limiting USB current to %umA", wm831x_usb_limits[best]);

	wm831x_set_bits(wm831x_power->wm831x, WM831X_POWER_STATE,
		        WM831X_USB_ILIM_MASK, best);

	return 0;
}

/*********************************************************************
 *		Battery properties
 *********************************************************************/

struct chg_map {
	int val;
	int reg_val;
};

static struct chg_map trickle_ilims[] = {
	{  50, 0 << WM831X_CHG_TRKL_ILIM_SHIFT },
	{ 100, 1 << WM831X_CHG_TRKL_ILIM_SHIFT },
	{ 150, 2 << WM831X_CHG_TRKL_ILIM_SHIFT },
	{ 200, 3 << WM831X_CHG_TRKL_ILIM_SHIFT },
};

static struct chg_map vsels[] = {
	{ 4050, 0 << WM831X_CHG_VSEL_SHIFT },
	{ 4100, 1 << WM831X_CHG_VSEL_SHIFT },
	{ 4150, 2 << WM831X_CHG_VSEL_SHIFT },
	{ 4200, 3 << WM831X_CHG_VSEL_SHIFT },
};

static struct chg_map fast_ilims[] = {
	{    0,  0 << WM831X_CHG_FAST_ILIM_SHIFT },
	{   50,  1 << WM831X_CHG_FAST_ILIM_SHIFT },
	{  100,  2 << WM831X_CHG_FAST_ILIM_SHIFT },
	{  150,  3 << WM831X_CHG_FAST_ILIM_SHIFT },
	{  200,  4 << WM831X_CHG_FAST_ILIM_SHIFT },
	{  250,  5 << WM831X_CHG_FAST_ILIM_SHIFT },
	{  300,  6 << WM831X_CHG_FAST_ILIM_SHIFT },
	{  350,  7 << WM831X_CHG_FAST_ILIM_SHIFT },
	{  400,  8 << WM831X_CHG_FAST_ILIM_SHIFT },
	{  450,  9 << WM831X_CHG_FAST_ILIM_SHIFT },
	{  500, 10 << WM831X_CHG_FAST_ILIM_SHIFT },
	{  600, 11 << WM831X_CHG_FAST_ILIM_SHIFT },
	{  700, 12 << WM831X_CHG_FAST_ILIM_SHIFT },
	{  800, 13 << WM831X_CHG_FAST_ILIM_SHIFT },
	{  900, 14 << WM831X_CHG_FAST_ILIM_SHIFT },
	{ 1000, 15 << WM831X_CHG_FAST_ILIM_SHIFT },
};

static struct chg_map eoc_iterms[] = {
	{ 20, 0 << WM831X_CHG_ITERM_SHIFT },
	{ 30, 1 << WM831X_CHG_ITERM_SHIFT },
	{ 40, 2 << WM831X_CHG_ITERM_SHIFT },
	{ 50, 3 << WM831X_CHG_ITERM_SHIFT },
	{ 60, 4 << WM831X_CHG_ITERM_SHIFT },
	{ 70, 5 << WM831X_CHG_ITERM_SHIFT },
	{ 80, 6 << WM831X_CHG_ITERM_SHIFT },
	{ 90, 7 << WM831X_CHG_ITERM_SHIFT },
};

static struct chg_map chg_times[] = {
	{  60,  0 << WM831X_CHG_TIME_SHIFT },
	{  90,  1 << WM831X_CHG_TIME_SHIFT },
	{ 120,  2 << WM831X_CHG_TIME_SHIFT },
	{ 150,  3 << WM831X_CHG_TIME_SHIFT },
	{ 180,  4 << WM831X_CHG_TIME_SHIFT },
	{ 210,  5 << WM831X_CHG_TIME_SHIFT },
	{ 240,  6 << WM831X_CHG_TIME_SHIFT },
	{ 270,  7 << WM831X_CHG_TIME_SHIFT },
	{ 300,  8 << WM831X_CHG_TIME_SHIFT },
	{ 330,  9 << WM831X_CHG_TIME_SHIFT },
	{ 360, 10 << WM831X_CHG_TIME_SHIFT },
	{ 390, 11 << WM831X_CHG_TIME_SHIFT },
	{ 420, 12 << WM831X_CHG_TIME_SHIFT },
	{ 450, 13 << WM831X_CHG_TIME_SHIFT },
	{ 480, 14 << WM831X_CHG_TIME_SHIFT },
	{ 510, 15 << WM831X_CHG_TIME_SHIFT },
};

static void wm831x_battery_apply_config(struct wm831x *wm831x,
				       struct chg_map *map, int count, int val,
				       int *reg, const char *name,
				       const char *units)
{
	int i;

	for (i = 0; i < count; i++)
		if (val == map[i].val)
			break;
	if (i == count) {
		dev_err(wm831x->dev, "Invalid %s %d%s\n",
			name, val, units);
	} else {
		*reg |= map[i].reg_val;
		dev_dbg(wm831x->dev, "Set %s of %d%s\n", name, val, units);
	}
}

static void wm831x_config_battery(struct wm831x *wm831x)
{
	struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
	struct wm831x_battery_pdata *pdata;
	int ret, reg1, reg2;

	if (!wm831x_pdata || !wm831x_pdata->battery) {
		dev_warn(wm831x->dev,
			 "No battery charger configuration\n");
		return;
	}

	pdata = wm831x_pdata->battery;

	reg1 = 0;
	reg2 = 0;

	if (!pdata->enable) {
		dev_info(wm831x->dev, "Battery charger disabled\n");
		return;
	}

	reg1 |= WM831X_CHG_ENA;
	if (pdata->off_mask)
		reg2 |= WM831X_CHG_OFF_MSK;
	if (pdata->fast_enable)
		reg1 |= WM831X_CHG_FAST;

	wm831x_battery_apply_config(wm831x, trickle_ilims,
				   ARRAY_SIZE(trickle_ilims),
				   pdata->trickle_ilim, &reg2,
				   "trickle charge current limit", "mA");

	wm831x_battery_apply_config(wm831x, vsels, ARRAY_SIZE(vsels),
				   pdata->vsel, &reg2,
				   "target voltage", "mV");

	wm831x_battery_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims),
				   pdata->fast_ilim, &reg2,
				   "fast charge current limit", "mA");

	wm831x_battery_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms),
				   pdata->eoc_iterm, &reg1,
				   "end of charge current threshold", "mA");

	wm831x_battery_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times),
				   pdata->timeout, &reg2,
				   "charger timeout", "min");

	ret = wm831x_reg_unlock(wm831x);
	if (ret != 0) {
		dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
		return;
	}

	ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_1,
			      WM831X_CHG_ENA_MASK |
			      WM831X_CHG_FAST_MASK |
			      WM831X_CHG_ITERM_MASK,
			      reg1);
	if (ret != 0)
		dev_err(wm831x->dev, "Failed to set charger control 1: %d\n",
			ret);

	ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_2,
			      WM831X_CHG_OFF_MSK |
			      WM831X_CHG_TIME_MASK |
			      WM831X_CHG_FAST_ILIM_MASK |
			      WM831X_CHG_TRKL_ILIM_MASK |
			      WM831X_CHG_VSEL_MASK,
			      reg2);
	if (ret != 0)
		dev_err(wm831x->dev, "Failed to set charger control 2: %d\n",
			ret);

	wm831x_reg_lock(wm831x);
}

static int wm831x_bat_check_status(struct wm831x *wm831x, int *status)
{
	int ret;

	ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
	if (ret < 0)
		return ret;

	if (ret & WM831X_PWR_SRC_BATT) {
		*status = POWER_SUPPLY_STATUS_DISCHARGING;
		return 0;
	}

	ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
	if (ret < 0)
		return ret;

	switch (ret & WM831X_CHG_STATE_MASK) {
	case WM831X_CHG_STATE_OFF:
		*status = POWER_SUPPLY_STATUS_NOT_CHARGING;
		break;
	case WM831X_CHG_STATE_TRICKLE:
	case WM831X_CHG_STATE_FAST:
		*status = POWER_SUPPLY_STATUS_CHARGING;
		break;

	default:
		*status = POWER_SUPPLY_STATUS_UNKNOWN;
		break;
	}

	return 0;
}

static int wm831x_bat_check_type(struct wm831x *wm831x, int *type)
{
	int ret;

	ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
	if (ret < 0)
		return ret;

	switch (ret & WM831X_CHG_STATE_MASK) {
	case WM831X_CHG_STATE_TRICKLE:
	case WM831X_CHG_STATE_TRICKLE_OT:
		*type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
		break;
	case WM831X_CHG_STATE_FAST:
	case WM831X_CHG_STATE_FAST_OT:
		*type = POWER_SUPPLY_CHARGE_TYPE_FAST;
		break;
	default:
		*type = POWER_SUPPLY_CHARGE_TYPE_NONE;
		break;
	}

	return 0;
}

static int wm831x_bat_check_health(struct wm831x *wm831x, int *health)
{
	int ret;

	ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
	if (ret < 0)
		return ret;

	if (ret & WM831X_BATT_HOT_STS) {
		*health = POWER_SUPPLY_HEALTH_OVERHEAT;
		return 0;
	}

	if (ret & WM831X_BATT_COLD_STS) {
		*health = POWER_SUPPLY_HEALTH_COLD;
		return 0;
	}

	if (ret & WM831X_BATT_OV_STS) {
		*health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
		return 0;
	}

	switch (ret & WM831X_CHG_STATE_MASK) {
	case WM831X_CHG_STATE_TRICKLE_OT:
	case WM831X_CHG_STATE_FAST_OT:
		*health = POWER_SUPPLY_HEALTH_OVERHEAT;
		break;
	case WM831X_CHG_STATE_DEFECTIVE:
		*health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
		break;
	default:
		*health = POWER_SUPPLY_HEALTH_GOOD;
		break;
	}

	return 0;
}

static int wm831x_bat_get_prop(struct power_supply *psy,
			       enum power_supply_property psp,
			       union power_supply_propval *val)
{
	struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent);
	struct wm831x *wm831x = wm831x_power->wm831x;
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = wm831x_bat_check_status(wm831x, &val->intval);
		break;
	case POWER_SUPPLY_PROP_ONLINE:
		ret = wm831x_power_check_online(wm831x, WM831X_PWR_SRC_BATT,
						val);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_BATT, val);
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		ret = wm831x_bat_check_health(wm831x, &val->intval);
		break;
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		ret = wm831x_bat_check_type(wm831x, &val->intval);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static enum power_supply_property wm831x_bat_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
};

static const char *wm831x_bat_irqs[] = {
	"BATT HOT",
	"BATT COLD",
	"BATT FAIL",
	"OV",
	"END",
	"TO",
	"MODE",
	"START",
};

static irqreturn_t wm831x_bat_irq(int irq, void *data)
{
	struct wm831x_power *wm831x_power = data;
	struct wm831x *wm831x = wm831x_power->wm831x;

	dev_dbg(wm831x->dev, "Battery status changed: %d\n", irq);

	/* The battery charger is autonomous so we don't need to do
	 * anything except kick user space */
	if (wm831x_power->have_battery)
		power_supply_changed(wm831x_power->battery);

	return IRQ_HANDLED;
}


/*********************************************************************
 *		Initialisation
 *********************************************************************/

static irqreturn_t wm831x_syslo_irq(int irq, void *data)
{
	struct wm831x_power *wm831x_power = data;
	struct wm831x *wm831x = wm831x_power->wm831x;

	/* Not much we can actually *do* but tell people for
	 * posterity, we're probably about to run out of power. */
	dev_crit(wm831x->dev, "SYSVDD under voltage\n");

	return IRQ_HANDLED;
}

static irqreturn_t wm831x_pwr_src_irq(int irq, void *data)
{
	struct wm831x_power *wm831x_power = data;
	struct wm831x *wm831x = wm831x_power->wm831x;

	dev_dbg(wm831x->dev, "Power source changed\n");

	/* Just notify for everything - little harm in overnotifying. */
	if (wm831x_power->have_battery)
		power_supply_changed(wm831x_power->battery);
	power_supply_changed(wm831x_power->usb);
	power_supply_changed(wm831x_power->wall);

	return IRQ_HANDLED;
}

static int wm831x_power_probe(struct platform_device *pdev)
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
	struct wm831x_power *power;
	int ret, irq, i;

	power = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_power),
			     GFP_KERNEL);
	if (power == NULL)
		return -ENOMEM;

	power->wm831x = wm831x;
	platform_set_drvdata(pdev, power);

	if (wm831x_pdata && wm831x_pdata->wm831x_num) {
		snprintf(power->wall_name, sizeof(power->wall_name),
			 "wm831x-wall.%d", wm831x_pdata->wm831x_num);
		snprintf(power->battery_name, sizeof(power->wall_name),
			 "wm831x-battery.%d", wm831x_pdata->wm831x_num);
		snprintf(power->usb_name, sizeof(power->wall_name),
			 "wm831x-usb.%d", wm831x_pdata->wm831x_num);
	} else {
		snprintf(power->wall_name, sizeof(power->wall_name),
			 "wm831x-wall");
		snprintf(power->battery_name, sizeof(power->wall_name),
			 "wm831x-battery");
		snprintf(power->usb_name, sizeof(power->wall_name),
			 "wm831x-usb");
	}

	/* We ignore configuration failures since we can still read back
	 * the status without enabling the charger.
	 */
	wm831x_config_battery(wm831x);

	power->wall_desc.name = power->wall_name;
	power->wall_desc.type = POWER_SUPPLY_TYPE_MAINS;
	power->wall_desc.properties = wm831x_wall_props;
	power->wall_desc.num_properties = ARRAY_SIZE(wm831x_wall_props);
	power->wall_desc.get_property = wm831x_wall_get_prop;
	power->wall = devm_power_supply_register(&pdev->dev,
						 &power->wall_desc,
						 NULL);
	if (IS_ERR(power->wall)) {
		ret = PTR_ERR(power->wall);
		goto err;
	}

	power->usb_desc.name = power->usb_name,
	power->usb_desc.type = POWER_SUPPLY_TYPE_USB;
	power->usb_desc.properties = wm831x_usb_props;
	power->usb_desc.num_properties = ARRAY_SIZE(wm831x_usb_props);
	power->usb_desc.get_property = wm831x_usb_get_prop;
	power->usb = devm_power_supply_register(&pdev->dev,
						&power->usb_desc,
						NULL);
	if (IS_ERR(power->usb)) {
		ret = PTR_ERR(power->usb);
		goto err_wall;
	}

	ret = wm831x_reg_read(wm831x, WM831X_CHARGER_CONTROL_1);
	if (ret < 0)
		goto err_wall;
	power->have_battery = ret & WM831X_CHG_ENA;

	if (power->have_battery) {
		power->battery_desc.name = power->battery_name;
		power->battery_desc.properties = wm831x_bat_props;
		power->battery_desc.num_properties = ARRAY_SIZE(wm831x_bat_props);
		power->battery_desc.get_property = wm831x_bat_get_prop;
		power->battery_desc.use_for_apm = 1;
		power->battery = devm_power_supply_register(&pdev->dev,
							    &power->battery_desc,
							    NULL);
		if (IS_ERR(power->battery)) {
			ret = PTR_ERR(power->battery);
			goto err_usb;
		}
	}

	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
	ret = request_threaded_irq(irq, NULL, wm831x_syslo_irq,
				   IRQF_TRIGGER_RISING | IRQF_ONESHOT, "System power low",
				   power);
	if (ret != 0) {
		dev_err(&pdev->dev, "Failed to request SYSLO IRQ %d: %d\n",
			irq, ret);
		goto err_battery;
	}

	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC"));
	ret = request_threaded_irq(irq, NULL, wm831x_pwr_src_irq,
				   IRQF_TRIGGER_RISING | IRQF_ONESHOT, "Power source",
				   power);
	if (ret != 0) {
		dev_err(&pdev->dev, "Failed to request PWR SRC IRQ %d: %d\n",
			irq, ret);
		goto err_syslo;
	}

	for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
		irq = wm831x_irq(wm831x,
				 platform_get_irq_byname(pdev,
							 wm831x_bat_irqs[i]));
		ret = request_threaded_irq(irq, NULL, wm831x_bat_irq,
					   IRQF_TRIGGER_RISING | IRQF_ONESHOT,
					   wm831x_bat_irqs[i],
					   power);
		if (ret != 0) {
			dev_err(&pdev->dev,
				"Failed to request %s IRQ %d: %d\n",
				wm831x_bat_irqs[i], irq, ret);
			goto err_bat_irq;
		}
	}

	power->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "phys", 0);
	ret = PTR_ERR_OR_ZERO(power->usb_phy);

	switch (ret) {
	case 0:
		power->usb_notify.notifier_call = wm831x_usb_limit_change;
		ret = usb_register_notifier(power->usb_phy, &power->usb_notify);
		if (ret) {
			dev_err(&pdev->dev, "Failed to register notifier: %d\n",
				ret);
			goto err_bat_irq;
		}
		break;
	case -EINVAL:
	case -ENODEV:
		/* ignore missing usb-phy, it's optional */
		power->usb_phy = NULL;
		ret = 0;
		break;
	default:
		dev_err(&pdev->dev, "Failed to find USB phy: %d\n", ret);
		fallthrough;
	case -EPROBE_DEFER:
		goto err_bat_irq;
	}

	return ret;

err_bat_irq:
	--i;
	for (; i >= 0; i--) {
		irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
		free_irq(irq, power);
	}
	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC"));
	free_irq(irq, power);
err_syslo:
	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
	free_irq(irq, power);
err_battery:
err_usb:
err_wall:
err:
	return ret;
}

static void wm831x_power_remove(struct platform_device *pdev)
{
	struct wm831x_power *wm831x_power = platform_get_drvdata(pdev);
	struct wm831x *wm831x = wm831x_power->wm831x;
	int irq, i;

	if (wm831x_power->usb_phy) {
		usb_unregister_notifier(wm831x_power->usb_phy,
					&wm831x_power->usb_notify);
	}

	for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
		irq = wm831x_irq(wm831x, 
				 platform_get_irq_byname(pdev,
							 wm831x_bat_irqs[i]));
		free_irq(irq, wm831x_power);
	}

	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC"));
	free_irq(irq, wm831x_power);

	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
	free_irq(irq, wm831x_power);
}

static struct platform_driver wm831x_power_driver = {
	.probe = wm831x_power_probe,
	.remove_new = wm831x_power_remove,
	.driver = {
		.name = "wm831x-power",
	},
};

module_platform_driver(wm831x_power_driver);

MODULE_DESCRIPTION("Power supply driver for WM831x PMICs");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-power");