Bootlin logo

Elixir Cross Referencer

  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
/*
 * max14577_charger.c - Battery charger driver for the Maxim 14577/77836
 *
 * Copyright (C) 2013,2014 Samsung Electronics
 * Krzysztof Kozlowski <krzk@kernel.org>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/max14577-private.h>
#include <linux/mfd/max14577.h>

struct max14577_charger {
	struct device		*dev;
	struct max14577		*max14577;
	struct power_supply	*charger;

	struct max14577_charger_platform_data	*pdata;
};

/*
 * Helper function for mapping values of STATUS2/CHGTYP register on max14577
 * and max77836 chipsets to enum maxim_muic_charger_type.
 */
static enum max14577_muic_charger_type maxim_get_charger_type(
		enum maxim_device_type dev_type, u8 val) {
	switch (val) {
	case MAX14577_CHARGER_TYPE_NONE:
	case MAX14577_CHARGER_TYPE_USB:
	case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
	case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
	case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
	case MAX14577_CHARGER_TYPE_SPECIAL_1A:
		return val;
	case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
	case MAX14577_CHARGER_TYPE_RESERVED:
		if (dev_type == MAXIM_DEVICE_TYPE_MAX77836)
			val |= 0x8;
		return val;
	default:
		WARN_ONCE(1, "max14577: Unsupported chgtyp register value 0x%02x", val);
		return val;
	}
}

static int max14577_get_charger_state(struct max14577_charger *chg, int *val)
{
	struct regmap *rmap = chg->max14577->regmap;
	int ret;
	u8 reg_data;

	/*
	 * Charging occurs only if:
	 *  - CHGCTRL2/MBCHOSTEN == 1
	 *  - STATUS2/CGMBC == 1
	 *
	 * TODO:
	 *  - handle FULL after Top-off timer (EOC register may be off
	 *    and the charger won't be charging although MBCHOSTEN is on)
	 *  - handle properly dead-battery charging (respect timer)
	 *  - handle timers (fast-charge and prequal) /MBCCHGERR/
	 */
	ret = max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
	if (ret < 0)
		goto out;

	if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) {
		*val = POWER_SUPPLY_STATUS_DISCHARGING;
		goto out;
	}

	ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
	if (ret < 0)
		goto out;

	if (reg_data & STATUS3_CGMBC_MASK) {
		/* Charger or USB-cable is connected */
		if (reg_data & STATUS3_EOC_MASK)
			*val = POWER_SUPPLY_STATUS_FULL;
		else
			*val = POWER_SUPPLY_STATUS_CHARGING;
		goto out;
	}

	*val = POWER_SUPPLY_STATUS_DISCHARGING;

out:
	return ret;
}

/*
 * Supported charge types:
 *  - POWER_SUPPLY_CHARGE_TYPE_NONE
 *  - POWER_SUPPLY_CHARGE_TYPE_FAST
 */
static int max14577_get_charge_type(struct max14577_charger *chg, int *val)
{
	int ret, charging;

	/*
	 * TODO: CHARGE_TYPE_TRICKLE (VCHGR_RC or EOC)?
	 * As spec says:
	 * [after reaching EOC interrupt]
	 * "When the battery is fully charged, the 30-minute (typ)
	 *  top-off timer starts. The device continues to trickle
	 *  charge the battery until the top-off timer runs out."
	 */
	ret = max14577_get_charger_state(chg, &charging);
	if (ret < 0)
		return ret;

	if (charging == POWER_SUPPLY_STATUS_CHARGING)
		*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
	else
		*val = POWER_SUPPLY_CHARGE_TYPE_NONE;

	return 0;
}

static int max14577_get_online(struct max14577_charger *chg, int *val)
{
	struct regmap *rmap = chg->max14577->regmap;
	u8 reg_data;
	int ret;
	enum max14577_muic_charger_type chg_type;

	ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
	if (ret < 0)
		return ret;

	reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
	chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
	switch (chg_type) {
	case MAX14577_CHARGER_TYPE_USB:
	case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
	case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
	case MAX14577_CHARGER_TYPE_SPECIAL_1A:
	case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
	case MAX77836_CHARGER_TYPE_SPECIAL_BIAS:
		*val = 1;
		break;
	case MAX14577_CHARGER_TYPE_NONE:
	case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
	case MAX14577_CHARGER_TYPE_RESERVED:
	case MAX77836_CHARGER_TYPE_RESERVED:
	default:
		*val = 0;
	}

	return 0;
}

/*
 * Supported health statuses:
 *  - POWER_SUPPLY_HEALTH_DEAD
 *  - POWER_SUPPLY_HEALTH_OVERVOLTAGE
 *  - POWER_SUPPLY_HEALTH_GOOD
 */
static int max14577_get_battery_health(struct max14577_charger *chg, int *val)
{
	struct regmap *rmap = chg->max14577->regmap;
	int ret;
	u8 reg_data;
	enum max14577_muic_charger_type chg_type;

	ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
	if (ret < 0)
		goto out;

	reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
	chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
	if (chg_type == MAX14577_CHARGER_TYPE_DEAD_BATTERY) {
		*val = POWER_SUPPLY_HEALTH_DEAD;
		goto out;
	}

	ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
	if (ret < 0)
		goto out;

	if (reg_data & STATUS3_OVP_MASK) {
		*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
		goto out;
	}

	/* Not dead, not overvoltage */
	*val = POWER_SUPPLY_HEALTH_GOOD;

out:
	return ret;
}

/*
 * Always returns 1.
 * The max14577 chip doesn't report any status of battery presence.
 * Lets assume that it will always be used with some battery.
 */
static int max14577_get_present(struct max14577_charger *chg, int *val)
{
	*val = 1;

	return 0;
}

static int max14577_set_fast_charge_timer(struct max14577_charger *chg,
		unsigned long hours)
{
	u8 reg_data;

	switch (hours) {
	case 5 ... 7:
		reg_data = hours - 3;
		break;
	case 0:
		/* Disable */
		reg_data = 0x7;
		break;
	default:
		dev_err(chg->dev, "Wrong value for Fast-Charge Timer: %lu\n",
				hours);
		return -EINVAL;
	}
	reg_data <<= CHGCTRL1_TCHW_SHIFT;

	return max14577_update_reg(chg->max14577->regmap,
			MAX14577_REG_CHGCTRL1, CHGCTRL1_TCHW_MASK, reg_data);
}

static int max14577_init_constant_voltage(struct max14577_charger *chg,
		unsigned int uvolt)
{
	u8 reg_data;

	if (uvolt < MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN ||
			uvolt > MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
		return -EINVAL;

	if (uvolt == 4200000)
		reg_data = 0x0;
	else if (uvolt == MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
		reg_data = 0x1f;
	else if (uvolt <= 4280000) {
		unsigned int val = uvolt;

		val -= MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN;
		val /= MAXIM_CHARGER_CONSTANT_VOLTAGE_STEP;
		if (uvolt <= 4180000)
			reg_data = 0x1 + val;
		else
			reg_data = val; /* Fix for gap between 4.18V and 4.22V */
	} else
		return -EINVAL;

	reg_data <<= CHGCTRL3_MBCCVWRC_SHIFT;

	return max14577_write_reg(chg->max14577->regmap,
			MAX14577_CHG_REG_CHG_CTRL3, reg_data);
}

static int max14577_init_eoc(struct max14577_charger *chg,
		unsigned int uamp)
{
	unsigned int current_bits = 0xf;
	u8 reg_data;

	switch (chg->max14577->dev_type) {
	case MAXIM_DEVICE_TYPE_MAX77836:
		if (uamp < 5000)
			return -EINVAL; /* Requested current is too low */

		if (uamp >= 7500 && uamp < 10000)
			current_bits = 0x0;
		else if (uamp <= 50000) {
			/* <5000, 7499> and <10000, 50000> */
			current_bits = uamp / 5000;
		} else {
			uamp = min(uamp, 100000U) - 50000U;
			current_bits = 0xa + uamp / 10000;
		}
		break;

	case MAXIM_DEVICE_TYPE_MAX14577:
	default:
		if (uamp < MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN)
			return -EINVAL; /* Requested current is too low */

		uamp = min(uamp, MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
		uamp -= MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN;
		current_bits = uamp / MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP;
		break;
	}

	reg_data = current_bits << CHGCTRL5_EOCS_SHIFT;

	return max14577_update_reg(chg->max14577->regmap,
			MAX14577_CHG_REG_CHG_CTRL5, CHGCTRL5_EOCS_MASK,
			reg_data);
}

static int max14577_init_fast_charge(struct max14577_charger *chg,
		unsigned int uamp)
{
	u8 reg_data;
	int ret;
	const struct maxim_charger_current *limits =
		&maxim_charger_currents[chg->max14577->dev_type];

	ret = maxim_charger_calc_reg_current(limits, uamp, uamp, &reg_data);
	if (ret) {
		dev_err(chg->dev, "Wrong value for fast charge: %u\n", uamp);
		return ret;
	}

	return max14577_update_reg(chg->max14577->regmap,
			MAX14577_CHG_REG_CHG_CTRL4,
			CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
			reg_data);
}

/*
 * Sets charger registers to proper and safe default values.
 * Some of these values are equal to defaults in MAX14577E
 * data sheet but there are minor differences.
 */
static int max14577_charger_reg_init(struct max14577_charger *chg)
{
	struct regmap *rmap = chg->max14577->regmap;
	u8 reg_data;
	int ret;

	/*
	 * Charger-Type Manual Detection, default off (set CHGTYPMAN to 0)
	 * Charger-Detection Enable, default on (set CHGDETEN to 1)
	 * Combined mask of CHGDETEN and CHGTYPMAN will zero the CHGTYPMAN bit
	 */
	reg_data = 0x1 << CDETCTRL1_CHGDETEN_SHIFT;
	max14577_update_reg(rmap, MAX14577_REG_CDETCTRL1,
			CDETCTRL1_CHGDETEN_MASK | CDETCTRL1_CHGTYPMAN_MASK,
			reg_data);

	/*
	 * Wall-Adapter Rapid Charge, default on
	 * Battery-Charger, default on
	 */
	reg_data = 0x1 << CHGCTRL2_VCHGR_RC_SHIFT;
	reg_data |= 0x1 << CHGCTRL2_MBCHOSTEN_SHIFT;
	max14577_write_reg(rmap, MAX14577_REG_CHGCTRL2, reg_data);

	/* Auto Charging Stop, default off */
	reg_data = 0x0 << CHGCTRL6_AUTOSTOP_SHIFT;
	max14577_write_reg(rmap, MAX14577_REG_CHGCTRL6, reg_data);

	ret = max14577_init_constant_voltage(chg, chg->pdata->constant_uvolt);
	if (ret)
		return ret;

	ret = max14577_init_eoc(chg, chg->pdata->eoc_uamp);
	if (ret)
		return ret;

	ret = max14577_init_fast_charge(chg, chg->pdata->fast_charge_uamp);
	if (ret)
		return ret;

	ret = max14577_set_fast_charge_timer(chg,
			MAXIM_CHARGER_FAST_CHARGE_TIMER_DEFAULT);
	if (ret)
		return ret;

	/* Initialize Overvoltage-Protection Threshold */
	switch (chg->pdata->ovp_uvolt) {
	case 7500000:
		reg_data = 0x0;
		break;
	case 6000000:
	case 6500000:
	case 7000000:
		reg_data = 0x1 + (chg->pdata->ovp_uvolt - 6000000) / 500000;
		break;
	default:
		dev_err(chg->dev, "Wrong value for OVP: %u\n",
				chg->pdata->ovp_uvolt);
		return -EINVAL;
	}
	reg_data <<= CHGCTRL7_OTPCGHCVS_SHIFT;
	max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data);

	return 0;
}

/* Support property from charger */
static enum power_supply_property max14577_charger_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static const char * const model_names[] = {
	[MAXIM_DEVICE_TYPE_UNKNOWN]	= "MAX14577-like",
	[MAXIM_DEVICE_TYPE_MAX14577]	= "MAX14577",
	[MAXIM_DEVICE_TYPE_MAX77836]	= "MAX77836",
};
static const char *manufacturer = "Maxim Integrated";

static int max14577_charger_get_property(struct power_supply *psy,
			    enum power_supply_property psp,
			    union power_supply_propval *val)
{
	struct max14577_charger *chg = power_supply_get_drvdata(psy);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = max14577_get_charger_state(chg, &val->intval);
		break;
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		ret = max14577_get_charge_type(chg, &val->intval);
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		ret = max14577_get_battery_health(chg, &val->intval);
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		ret = max14577_get_present(chg, &val->intval);
		break;
	case POWER_SUPPLY_PROP_ONLINE:
		ret = max14577_get_online(chg, &val->intval);
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
		BUILD_BUG_ON(ARRAY_SIZE(model_names) != MAXIM_DEVICE_TYPE_NUM);
		val->strval = model_names[chg->max14577->dev_type];
		break;
	case POWER_SUPPLY_PROP_MANUFACTURER:
		val->strval = manufacturer;
		break;
	default:
		return -EINVAL;
	}

	return ret;
}

static const struct power_supply_desc max14577_charger_desc = {
	.name = "max14577-charger",
	.type = POWER_SUPPLY_TYPE_BATTERY,
	.properties = max14577_charger_props,
	.num_properties = ARRAY_SIZE(max14577_charger_props),
	.get_property = max14577_charger_get_property,
};

#ifdef CONFIG_OF
static struct max14577_charger_platform_data *max14577_charger_dt_init(
		struct platform_device *pdev)
{
	struct max14577_charger_platform_data *pdata;
	struct device_node *np = pdev->dev.of_node;
	int ret;

	if (!np) {
		dev_err(&pdev->dev, "No charger OF node\n");
		return ERR_PTR(-EINVAL);
	}

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	ret = of_property_read_u32(np, "maxim,constant-uvolt",
			&pdata->constant_uvolt);
	if (ret) {
		dev_err(&pdev->dev, "Cannot parse maxim,constant-uvolt field from DT\n");
		return ERR_PTR(ret);
	}

	ret = of_property_read_u32(np, "maxim,fast-charge-uamp",
			&pdata->fast_charge_uamp);
	if (ret) {
		dev_err(&pdev->dev, "Cannot parse maxim,fast-charge-uamp field from DT\n");
		return ERR_PTR(ret);
	}

	ret = of_property_read_u32(np, "maxim,eoc-uamp", &pdata->eoc_uamp);
	if (ret) {
		dev_err(&pdev->dev, "Cannot parse maxim,eoc-uamp field from DT\n");
		return ERR_PTR(ret);
	}

	ret = of_property_read_u32(np, "maxim,ovp-uvolt", &pdata->ovp_uvolt);
	if (ret) {
		dev_err(&pdev->dev, "Cannot parse maxim,ovp-uvolt field from DT\n");
		return ERR_PTR(ret);
	}

	return pdata;
}
#else /* CONFIG_OF */
static struct max14577_charger_platform_data *max14577_charger_dt_init(
		struct platform_device *pdev)
{
	return NULL;
}
#endif /* CONFIG_OF */

static ssize_t show_fast_charge_timer(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct max14577_charger *chg = dev_get_drvdata(dev);
	u8 reg_data;
	int ret;
	unsigned int val;

	ret = max14577_read_reg(chg->max14577->regmap, MAX14577_REG_CHGCTRL1,
			&reg_data);
	if (ret)
		return ret;

	reg_data &= CHGCTRL1_TCHW_MASK;
	reg_data >>= CHGCTRL1_TCHW_SHIFT;
	switch (reg_data) {
	case 0x2 ... 0x4:
		val = reg_data + 3;
		break;
	case 0x7:
		val = 0;
		break;
	default:
		val = 5;
		break;
	}

	return scnprintf(buf, PAGE_SIZE, "%u\n", val);
}

static ssize_t store_fast_charge_timer(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct max14577_charger *chg = dev_get_drvdata(dev);
	unsigned long val;
	int ret;

	ret = kstrtoul(buf, 10, &val);
	if (ret)
		return ret;

	ret = max14577_set_fast_charge_timer(chg, val);
	if (ret)
		return ret;

	return count;
}

static DEVICE_ATTR(fast_charge_timer, S_IRUGO | S_IWUSR,
		show_fast_charge_timer, store_fast_charge_timer);

static int max14577_charger_probe(struct platform_device *pdev)
{
	struct max14577_charger *chg;
	struct power_supply_config psy_cfg = {};
	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
	int ret;

	chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
	if (!chg)
		return -ENOMEM;

	platform_set_drvdata(pdev, chg);
	chg->dev = &pdev->dev;
	chg->max14577 = max14577;

	chg->pdata = max14577_charger_dt_init(pdev);
	if (IS_ERR_OR_NULL(chg->pdata))
		return PTR_ERR(chg->pdata);

	ret = max14577_charger_reg_init(chg);
	if (ret)
		return ret;

	ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer);
	if (ret) {
		dev_err(&pdev->dev, "failed: create sysfs entry\n");
		return ret;
	}

	psy_cfg.drv_data = chg;
	chg->charger = power_supply_register(&pdev->dev, &max14577_charger_desc,
						&psy_cfg);
	if (IS_ERR(chg->charger)) {
		dev_err(&pdev->dev, "failed: power supply register\n");
		ret = PTR_ERR(chg->charger);
		goto err;
	}

	/* Check for valid values for charger */
	BUILD_BUG_ON(MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN +
			MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP * 0xf !=
			MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
	return 0;

err:
	device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);

	return ret;
}

static int max14577_charger_remove(struct platform_device *pdev)
{
	struct max14577_charger *chg = platform_get_drvdata(pdev);

	device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
	power_supply_unregister(chg->charger);

	return 0;
}

static const struct platform_device_id max14577_charger_id[] = {
	{ "max14577-charger", MAXIM_DEVICE_TYPE_MAX14577, },
	{ "max77836-charger", MAXIM_DEVICE_TYPE_MAX77836, },
	{ }
};
MODULE_DEVICE_TABLE(platform, max14577_charger_id);

static struct platform_driver max14577_charger_driver = {
	.driver = {
		.name	= "max14577-charger",
	},
	.probe		= max14577_charger_probe,
	.remove		= max14577_charger_remove,
	.id_table	= max14577_charger_id,
};
module_platform_driver(max14577_charger_driver);

MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
MODULE_DESCRIPTION("Maxim 14577/77836 charger driver");
MODULE_LICENSE("GPL");