summaryrefslogtreecommitdiffstats
path: root/drivers/power/supply/ucs1002_power.c
blob: 7970843a4f480d70999cf54449360aedf85f9598 (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Driver for UCS1002 Programmable USB Port Power Controller
 *
 * Copyright (C) 2019 Zodiac Inflight Innovations
 */
#include <linux/bits.h>
#include <linux/freezer.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>

/* UCS1002 Registers */
#define UCS1002_REG_CURRENT_MEASUREMENT	0x00

/*
 * The Total Accumulated Charge registers store the total accumulated
 * charge delivered from the VS source to a portable device. The total
 * value is calculated using four registers, from 01h to 04h. The bit
 * weighting of the registers is given in mA/hrs.
 */
#define UCS1002_REG_TOTAL_ACC_CHARGE	0x01

/* Other Status Register */
#define UCS1002_REG_OTHER_STATUS	0x0f
#  define F_ADET_PIN			BIT(4)
#  define F_CHG_ACT			BIT(3)

/* Interrupt Status */
#define UCS1002_REG_INTERRUPT_STATUS	0x10
#  define F_ERR				BIT(7)
#  define F_DISCHARGE_ERR		BIT(6)
#  define F_RESET			BIT(5)
#  define F_MIN_KEEP_OUT		BIT(4)
#  define F_TSD				BIT(3)
#  define F_OVER_VOLT			BIT(2)
#  define F_BACK_VOLT			BIT(1)
#  define F_OVER_ILIM			BIT(0)

/* Pin Status Register */
#define UCS1002_REG_PIN_STATUS		0x14
#  define UCS1002_PWR_STATE_MASK	0x03
#  define F_PWR_EN_PIN			BIT(6)
#  define F_M2_PIN			BIT(5)
#  define F_M1_PIN			BIT(4)
#  define F_EM_EN_PIN			BIT(3)
#  define F_SEL_PIN			BIT(2)
#  define F_ACTIVE_MODE_MASK		GENMASK(5, 3)
#  define F_ACTIVE_MODE_PASSTHROUGH	F_M2_PIN
#  define F_ACTIVE_MODE_DEDICATED	F_EM_EN_PIN
#  define F_ACTIVE_MODE_BC12_DCP	(F_M2_PIN | F_EM_EN_PIN)
#  define F_ACTIVE_MODE_BC12_SDP	F_M1_PIN
#  define F_ACTIVE_MODE_BC12_CDP	(F_M1_PIN | F_M2_PIN | F_EM_EN_PIN)

/* General Configuration Register */
#define UCS1002_REG_GENERAL_CFG		0x15
#  define F_RATION_EN			BIT(3)

/* Emulation Configuration Register */
#define UCS1002_REG_EMU_CFG		0x16

/* Switch Configuration Register */
#define UCS1002_REG_SWITCH_CFG		0x17
#  define F_PIN_IGNORE			BIT(7)
#  define F_EM_EN_SET			BIT(5)
#  define F_M2_SET			BIT(4)
#  define F_M1_SET			BIT(3)
#  define F_S0_SET			BIT(2)
#  define F_PWR_EN_SET			BIT(1)
#  define F_LATCH_SET			BIT(0)
#  define V_SET_ACTIVE_MODE_MASK	GENMASK(5, 3)
#  define V_SET_ACTIVE_MODE_PASSTHROUGH	F_M2_SET
#  define V_SET_ACTIVE_MODE_DEDICATED	F_EM_EN_SET
#  define V_SET_ACTIVE_MODE_BC12_DCP	(F_M2_SET | F_EM_EN_SET)
#  define V_SET_ACTIVE_MODE_BC12_SDP	F_M1_SET
#  define V_SET_ACTIVE_MODE_BC12_CDP	(F_M1_SET | F_M2_SET | F_EM_EN_SET)

/* Current Limit Register */
#define UCS1002_REG_ILIMIT		0x19
#  define UCS1002_ILIM_SW_MASK		GENMASK(3, 0)

/* Product ID */
#define UCS1002_REG_PRODUCT_ID		0xfd
#  define UCS1002_PRODUCT_ID		0x4e

/* Manufacture name */
#define UCS1002_MANUFACTURER		"SMSC"

struct ucs1002_info {
	struct power_supply *charger;
	struct i2c_client *client;
	struct regmap *regmap;
	struct regulator_desc *regulator_descriptor;
	struct regulator_dev *rdev;
	bool present;
	bool output_disable;
	struct delayed_work health_poll;
	int health;

};

static enum power_supply_property ucs1002_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CURRENT_MAX,
	POWER_SUPPLY_PROP_PRESENT, /* the presence of PED */
	POWER_SUPPLY_PROP_MANUFACTURER,
	POWER_SUPPLY_PROP_USB_TYPE,
	POWER_SUPPLY_PROP_HEALTH,
};

static int ucs1002_get_online(struct ucs1002_info *info,
			      union power_supply_propval *val)
{
	unsigned int reg;
	int ret;

	ret = regmap_read(info->regmap, UCS1002_REG_OTHER_STATUS, &reg);
	if (ret)
		return ret;

	val->intval = !!(reg & F_CHG_ACT);

	return 0;
}

static int ucs1002_get_charge(struct ucs1002_info *info,
			      union power_supply_propval *val)
{
	/*
	 * To fit within 32 bits some values are rounded (uA/h)
	 *
	 * For Total Accumulated Charge Middle Low Byte register, addr
	 * 03h, byte 2
	 *
	 *   B0: 0.01084 mA/h rounded to 11 uA/h
	 *   B1: 0.02169 mA/h rounded to 22 uA/h
	 *   B2: 0.04340 mA/h rounded to 43 uA/h
	 *   B3: 0.08676 mA/h rounded to 87 uA/h
	 *   B4: 0.17350 mA/h rounded to 173 uÁ/h
	 *
	 * For Total Accumulated Charge Low Byte register, addr 04h,
	 * byte 3
	 *
	 *   B6: 0.00271 mA/h rounded to 3 uA/h
	 *   B7: 0.005422 mA/h rounded to 5 uA/h
	 */
	static const int bit_weights_uAh[BITS_PER_TYPE(u32)] = {
		/*
		 * Bit corresponding to low byte (offset 0x04)
		 * B0 B1 B2 B3 B4 B5 B6 B7
		 */
		0, 0, 0, 0, 0, 0, 3, 5,
		/*
		 * Bit corresponding to middle low byte (offset 0x03)
		 * B0 B1 B2 B3 B4 B5 B6 B7
		 */
		11, 22, 43, 87, 173, 347, 694, 1388,
		/*
		 * Bit corresponding to middle high byte (offset 0x02)
		 * B0 B1 B2 B3 B4 B5 B6 B7
		 */
		2776, 5552, 11105, 22210, 44420, 88840, 177700, 355400,
		/*
		 * Bit corresponding to high byte (offset 0x01)
		 * B0 B1 B2 B3 B4 B5 B6 B7
		 */
		710700, 1421000, 2843000, 5685000, 11371000, 22742000,
		45484000, 90968000,
	};
	unsigned long total_acc_charger;
	unsigned int reg;
	int i, ret;

	ret = regmap_bulk_read(info->regmap, UCS1002_REG_TOTAL_ACC_CHARGE,
			       &reg, sizeof(u32));
	if (ret)
		return ret;

	total_acc_charger = be32_to_cpu(reg); /* BE as per offsets above */
	val->intval = 0;

	for_each_set_bit(i, &total_acc_charger, ARRAY_SIZE(bit_weights_uAh))
		val->intval += bit_weights_uAh[i];

	return 0;
}

static int ucs1002_get_current(struct ucs1002_info *info,
			       union power_supply_propval *val)
{
	/*
	 * The Current Measurement register stores the measured
	 * current value delivered to the portable device. The range
	 * is from 9.76 mA to 2.5 A.
	 */
	static const int bit_weights_uA[BITS_PER_TYPE(u8)] = {
		9760, 19500, 39000, 78100, 156200, 312300, 624600, 1249300,
	};
	unsigned long current_measurement;
	unsigned int reg;
	int i, ret;

	ret = regmap_read(info->regmap, UCS1002_REG_CURRENT_MEASUREMENT, &reg);
	if (ret)
		return ret;

	current_measurement = reg;
	val->intval = 0;

	for_each_set_bit(i, &current_measurement, ARRAY_SIZE(bit_weights_uA))
		val->intval += bit_weights_uA[i];

	return 0;
}

/*
 * The Current Limit register stores the maximum current used by the
 * port switch. The range is from 500mA to 2.5 A.
 */
static const u32 ucs1002_current_limit_uA[] = {
	500000, 900000, 1000000, 1200000, 1500000, 1800000, 2000000, 2500000,
};

static int ucs1002_get_max_current(struct ucs1002_info *info,
				   union power_supply_propval *val)
{
	unsigned int reg;
	int ret;

	if (info->output_disable) {
		val->intval = 0;
		return 0;
	}

	ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, &reg);
	if (ret)
		return ret;

	val->intval = ucs1002_current_limit_uA[reg & UCS1002_ILIM_SW_MASK];

	return 0;
}

static int ucs1002_set_max_current(struct ucs1002_info *info, u32 val)
{
	unsigned int reg;
	int ret, idx;

	if (val == 0) {
		info->output_disable = true;
		regulator_disable_regmap(info->rdev);
		return 0;
	}

	for (idx = 0; idx < ARRAY_SIZE(ucs1002_current_limit_uA); idx++) {
		if (val == ucs1002_current_limit_uA[idx])
			break;
	}

	if (idx == ARRAY_SIZE(ucs1002_current_limit_uA))
		return -EINVAL;

	ret = regmap_write(info->regmap, UCS1002_REG_ILIMIT, idx);
	if (ret)
		return ret;
	/*
	 * Any current limit setting exceeding the one set via ILIM
	 * pin will be rejected, so we read out freshly changed limit
	 * to make sure that it took effect.
	 */
	ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, &reg);
	if (ret)
		return ret;

	if (reg != idx)
		return -EINVAL;

	info->output_disable = false;

	if (info->rdev && info->rdev->use_count &&
	    !regulator_is_enabled_regmap(info->rdev))
		regulator_enable_regmap(info->rdev);

	return 0;
}

static enum power_supply_usb_type ucs1002_usb_types[] = {
	POWER_SUPPLY_USB_TYPE_PD,
	POWER_SUPPLY_USB_TYPE_SDP,
	POWER_SUPPLY_USB_TYPE_DCP,
	POWER_SUPPLY_USB_TYPE_CDP,
	POWER_SUPPLY_USB_TYPE_UNKNOWN,
};

static int ucs1002_set_usb_type(struct ucs1002_info *info, int val)
{
	unsigned int mode;

	if (val < 0 || val >= ARRAY_SIZE(ucs1002_usb_types))
		return -EINVAL;

	switch (ucs1002_usb_types[val]) {
	case POWER_SUPPLY_USB_TYPE_PD:
		mode = V_SET_ACTIVE_MODE_DEDICATED;
		break;
	case POWER_SUPPLY_USB_TYPE_SDP:
		mode = V_SET_ACTIVE_MODE_BC12_SDP;
		break;
	case POWER_SUPPLY_USB_TYPE_DCP:
		mode = V_SET_ACTIVE_MODE_BC12_DCP;
		break;
	case POWER_SUPPLY_USB_TYPE_CDP:
		mode = V_SET_ACTIVE_MODE_BC12_CDP;
		break;
	default:
		return -EINVAL;
	}

	return regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG,
				  V_SET_ACTIVE_MODE_MASK, mode);
}

static int ucs1002_get_usb_type(struct ucs1002_info *info,
				union power_supply_propval *val)
{
	enum power_supply_usb_type type;
	unsigned int reg;
	int ret;

	ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, &reg);
	if (ret)
		return ret;

	switch (reg & F_ACTIVE_MODE_MASK) {
	default:
		type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
		break;
	case F_ACTIVE_MODE_DEDICATED:
		type = POWER_SUPPLY_USB_TYPE_PD;
		break;
	case F_ACTIVE_MODE_BC12_SDP:
		type = POWER_SUPPLY_USB_TYPE_SDP;
		break;
	case F_ACTIVE_MODE_BC12_DCP:
		type = POWER_SUPPLY_USB_TYPE_DCP;
		break;
	case F_ACTIVE_MODE_BC12_CDP:
		type = POWER_SUPPLY_USB_TYPE_CDP;
		break;
	}

	val->intval = type;

	return 0;
}

static int ucs1002_get_property(struct power_supply *psy,
				enum power_supply_property psp,
				union power_supply_propval *val)
{
	struct ucs1002_info *info = power_supply_get_drvdata(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		return ucs1002_get_online(info, val);
	case POWER_SUPPLY_PROP_CHARGE_NOW:
		return ucs1002_get_charge(info, val);
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		return ucs1002_get_current(info, val);
	case POWER_SUPPLY_PROP_CURRENT_MAX:
		return ucs1002_get_max_current(info, val);
	case POWER_SUPPLY_PROP_USB_TYPE:
		return ucs1002_get_usb_type(info, val);
	case POWER_SUPPLY_PROP_HEALTH:
		val->intval = info->health;
		return 0;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = info->present;
		return 0;
	case POWER_SUPPLY_PROP_MANUFACTURER:
		val->strval = UCS1002_MANUFACTURER;
		return 0;
	default:
		return -EINVAL;
	}
}

static int ucs1002_set_property(struct power_supply *psy,
				enum power_supply_property psp,
				const union power_supply_propval *val)
{
	struct ucs1002_info *info = power_supply_get_drvdata(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_CURRENT_MAX:
		return ucs1002_set_max_current(info, val->intval);
	case POWER_SUPPLY_PROP_USB_TYPE:
		return ucs1002_set_usb_type(info, val->intval);
	default:
		return -EINVAL;
	}
}

static int ucs1002_property_is_writeable(struct power_supply *psy,
					 enum power_supply_property psp)
{
	switch (psp) {
	case POWER_SUPPLY_PROP_CURRENT_MAX:
	case POWER_SUPPLY_PROP_USB_TYPE:
		return true;
	default:
		return false;
	}
}

static const struct power_supply_desc ucs1002_charger_desc = {
	.name			= "ucs1002",
	.type			= POWER_SUPPLY_TYPE_USB,
	.usb_types		= ucs1002_usb_types,
	.num_usb_types		= ARRAY_SIZE(ucs1002_usb_types),
	.get_property		= ucs1002_get_property,
	.set_property		= ucs1002_set_property,
	.property_is_writeable	= ucs1002_property_is_writeable,
	.properties		= ucs1002_props,
	.num_properties		= ARRAY_SIZE(ucs1002_props),
};

static void ucs1002_health_poll(struct work_struct *work)
{
	struct ucs1002_info *info = container_of(work, struct ucs1002_info,
						 health_poll.work);
	int ret;
	u32 reg;

	ret = regmap_read(info->regmap, UCS1002_REG_INTERRUPT_STATUS, &reg);
	if (ret)
		return;

	/* bad health and no status change, just schedule us again in a while */
	if ((reg & F_ERR) && info->health != POWER_SUPPLY_HEALTH_GOOD) {
		schedule_delayed_work(&info->health_poll,
				      msecs_to_jiffies(2000));
		return;
	}

	if (reg & F_TSD)
		info->health = POWER_SUPPLY_HEALTH_OVERHEAT;
	else if (reg & (F_OVER_VOLT | F_BACK_VOLT))
		info->health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
	else if (reg & F_OVER_ILIM)
		info->health = POWER_SUPPLY_HEALTH_OVERCURRENT;
	else if (reg & (F_DISCHARGE_ERR | F_MIN_KEEP_OUT))
		info->health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
	else
		info->health = POWER_SUPPLY_HEALTH_GOOD;

	sysfs_notify(&info->charger->dev.kobj, NULL, "health");
}

static irqreturn_t ucs1002_charger_irq(int irq, void *data)
{
	int ret, regval;
	bool present;
	struct ucs1002_info *info = data;

	present = info->present;

	ret = regmap_read(info->regmap, UCS1002_REG_OTHER_STATUS, &regval);
	if (ret)
		return IRQ_HANDLED;

	/* update attached status */
	info->present = regval & F_ADET_PIN;

	/* notify the change */
	if (present != info->present)
		power_supply_changed(info->charger);

	return IRQ_HANDLED;
}

static irqreturn_t ucs1002_alert_irq(int irq, void *data)
{
	struct ucs1002_info *info = data;

	mod_delayed_work(system_wq, &info->health_poll, 0);

	return IRQ_HANDLED;
}

static int ucs1002_regulator_enable(struct regulator_dev *rdev)
{
	struct ucs1002_info *info = rdev_get_drvdata(rdev);

	/*
	 * If the output is disabled due to 0 maximum current, just pretend the
	 * enable did work. The regulator will be enabled as soon as we get a
	 * a non-zero maximum current budget.
	 */
	if (info->output_disable)
		return 0;

	return regulator_enable_regmap(rdev);
}

static const struct regulator_ops ucs1002_regulator_ops = {
	.is_enabled	= regulator_is_enabled_regmap,
	.enable		= ucs1002_regulator_enable,
	.disable	= regulator_disable_regmap,
};

static const struct regulator_desc ucs1002_regulator_descriptor = {
	.name		= "ucs1002-vbus",
	.ops		= &ucs1002_regulator_ops,
	.type		= REGULATOR_VOLTAGE,
	.owner		= THIS_MODULE,
	.enable_reg	= UCS1002_REG_SWITCH_CFG,
	.enable_mask	= F_PWR_EN_SET,
	.enable_val	= F_PWR_EN_SET,
	.fixed_uV	= 5000000,
	.n_voltages	= 1,
};

static int ucs1002_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct power_supply_config charger_config = {};
	const struct regmap_config regmap_config = {
		.reg_bits = 8,
		.val_bits = 8,
	};
	struct regulator_config regulator_config = {};
	int irq_a_det, irq_alert, ret;
	struct ucs1002_info *info;
	unsigned int regval;

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

	info->regmap = devm_regmap_init_i2c(client, &regmap_config);
	ret = PTR_ERR_OR_ZERO(info->regmap);
	if (ret) {
		dev_err(dev, "Regmap initialization failed: %d\n", ret);
		return ret;
	}

	info->client = client;

	irq_a_det = of_irq_get_byname(dev->of_node, "a_det");
	irq_alert = of_irq_get_byname(dev->of_node, "alert");

	charger_config.of_node = dev->of_node;
	charger_config.drv_data = info;

	ret = regmap_read(info->regmap, UCS1002_REG_PRODUCT_ID, &regval);
	if (ret) {
		dev_err(dev, "Failed to read product ID: %d\n", ret);
		return ret;
	}

	if (regval != UCS1002_PRODUCT_ID) {
		dev_err(dev,
			"Product ID does not match (0x%02x != 0x%02x)\n",
			regval, UCS1002_PRODUCT_ID);
		return -ENODEV;
	}

	/* Enable charge rationing by default */
	ret = regmap_update_bits(info->regmap, UCS1002_REG_GENERAL_CFG,
				 F_RATION_EN, F_RATION_EN);
	if (ret) {
		dev_err(dev, "Failed to read general config: %d\n", ret);
		return ret;
	}

	/*
	 * Ignore the M1, M2, PWR_EN, and EM_EN pin states. Set active
	 * mode selection to BC1.2 CDP.
	 */
	ret = regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG,
				 V_SET_ACTIVE_MODE_MASK | F_PIN_IGNORE,
				 V_SET_ACTIVE_MODE_BC12_CDP | F_PIN_IGNORE);
	if (ret) {
		dev_err(dev, "Failed to configure default mode: %d\n", ret);
		return ret;
	}
	/*
	 * Be safe and set initial current limit to 500mA
	 */
	ret = ucs1002_set_max_current(info, 500000);
	if (ret) {
		dev_err(dev, "Failed to set max current default: %d\n", ret);
		return ret;
	}

	info->charger = devm_power_supply_register(dev, &ucs1002_charger_desc,
						   &charger_config);
	ret = PTR_ERR_OR_ZERO(info->charger);
	if (ret) {
		dev_err(dev, "Failed to register power supply: %d\n", ret);
		return ret;
	}

	ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, &regval);
	if (ret) {
		dev_err(dev, "Failed to read pin status: %d\n", ret);
		return ret;
	}

	info->regulator_descriptor =
		devm_kmemdup(dev, &ucs1002_regulator_descriptor,
			     sizeof(ucs1002_regulator_descriptor),
			     GFP_KERNEL);
	if (!info->regulator_descriptor)
		return -ENOMEM;

	info->regulator_descriptor->enable_is_inverted = !(regval & F_SEL_PIN);

	regulator_config.dev = dev;
	regulator_config.of_node = dev->of_node;
	regulator_config.regmap = info->regmap;
	regulator_config.driver_data = info;

	info->rdev = devm_regulator_register(dev, info->regulator_descriptor,
				       &regulator_config);
	ret = PTR_ERR_OR_ZERO(info->rdev);
	if (ret) {
		dev_err(dev, "Failed to register VBUS regulator: %d\n", ret);
		return ret;
	}

	info->health = POWER_SUPPLY_HEALTH_GOOD;
	INIT_DELAYED_WORK(&info->health_poll, ucs1002_health_poll);

	if (irq_a_det > 0) {
		ret = devm_request_threaded_irq(dev, irq_a_det, NULL,
						ucs1002_charger_irq,
						IRQF_ONESHOT,
						"ucs1002-a_det", info);
		if (ret) {
			dev_err(dev, "Failed to request A_DET threaded irq: %d\n",
				ret);
			return ret;
		}
	}

	if (irq_alert > 0) {
		ret = devm_request_irq(dev, irq_alert, ucs1002_alert_irq,
				       0,"ucs1002-alert", info);
		if (ret) {
			dev_err(dev, "Failed to request ALERT threaded irq: %d\n",
				ret);
			return ret;
		}
	}

	return 0;
}

static const struct of_device_id ucs1002_of_match[] = {
	{ .compatible = "microchip,ucs1002", },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ucs1002_of_match);

static struct i2c_driver ucs1002_driver = {
	.driver = {
		   .name = "ucs1002",
		   .of_match_table = ucs1002_of_match,
	},
	.probe = ucs1002_probe,
};
module_i2c_driver(ucs1002_driver);

MODULE_DESCRIPTION("Microchip UCS1002 Programmable USB Port Power Controller");
MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
MODULE_LICENSE("GPL");