summaryrefslogtreecommitdiff
path: root/drivers/rtc/rtc-isl12057.c
blob: 3ec73ad7f2d89686757e38611f665e8a6b4585d8 (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
/*
 * rtc-isl12057 - Driver for Intersil ISL12057 I2C Real Time Clock
 *
 * Copyright (C) 2013, Arnaud EBALARD <arno@natisbad.org>
 *
 * This work is largely based on Intersil ISL1208 driver developed by
 * Hebert Valerio Riedel <hvr@gnu.org>.
 *
 * Detailed datasheet on which this development is based is available here:
 *
 *  http://natisbad.org/NAS2/refs/ISL12057.pdf
 *
 * 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/mutex.h>
#include <linux/rtc.h>
#include <linux/i2c.h>
#include <linux/bcd.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regmap.h>

#define DRV_NAME "rtc-isl12057"

/* RTC section */
#define ISL12057_REG_RTC_SC	0x00	/* Seconds */
#define ISL12057_REG_RTC_MN	0x01	/* Minutes */
#define ISL12057_REG_RTC_HR	0x02	/* Hours */
#define ISL12057_REG_RTC_HR_PM	BIT(5)	/* AM/PM bit in 12h format */
#define ISL12057_REG_RTC_HR_MIL BIT(6)	/* 24h/12h format */
#define ISL12057_REG_RTC_DW	0x03	/* Day of the Week */
#define ISL12057_REG_RTC_DT	0x04	/* Date */
#define ISL12057_REG_RTC_MO	0x05	/* Month */
#define ISL12057_REG_RTC_MO_CEN	BIT(7)	/* Century bit */
#define ISL12057_REG_RTC_YR	0x06	/* Year */
#define ISL12057_RTC_SEC_LEN	7

/* Alarm 1 section */
#define ISL12057_REG_A1_SC	0x07	/* Alarm 1 Seconds */
#define ISL12057_REG_A1_MN	0x08	/* Alarm 1 Minutes */
#define ISL12057_REG_A1_HR	0x09	/* Alarm 1 Hours */
#define ISL12057_REG_A1_HR_PM	BIT(5)	/* AM/PM bit in 12h format */
#define ISL12057_REG_A1_HR_MIL	BIT(6)	/* 24h/12h format */
#define ISL12057_REG_A1_DWDT	0x0A	/* Alarm 1 Date / Day of the week */
#define ISL12057_REG_A1_DWDT_B	BIT(6)	/* DW / DT selection bit */
#define ISL12057_A1_SEC_LEN	4

/* Alarm 2 section */
#define ISL12057_REG_A2_MN	0x0B	/* Alarm 2 Minutes */
#define ISL12057_REG_A2_HR	0x0C	/* Alarm 2 Hours */
#define ISL12057_REG_A2_DWDT	0x0D	/* Alarm 2 Date / Day of the week */
#define ISL12057_A2_SEC_LEN	3

/* Control/Status registers */
#define ISL12057_REG_INT	0x0E
#define ISL12057_REG_INT_A1IE	BIT(0)	/* Alarm 1 interrupt enable bit */
#define ISL12057_REG_INT_A2IE	BIT(1)	/* Alarm 2 interrupt enable bit */
#define ISL12057_REG_INT_INTCN	BIT(2)	/* Interrupt control enable bit */
#define ISL12057_REG_INT_RS1	BIT(3)	/* Freq out control bit 1 */
#define ISL12057_REG_INT_RS2	BIT(4)	/* Freq out control bit 2 */
#define ISL12057_REG_INT_EOSC	BIT(7)	/* Oscillator enable bit */

#define ISL12057_REG_SR		0x0F
#define ISL12057_REG_SR_A1F	BIT(0)	/* Alarm 1 interrupt bit */
#define ISL12057_REG_SR_A2F	BIT(1)	/* Alarm 2 interrupt bit */
#define ISL12057_REG_SR_OSF	BIT(7)	/* Oscillator failure bit */

/* Register memory map length */
#define ISL12057_MEM_MAP_LEN	0x10

struct isl12057_rtc_data {
	struct rtc_device *rtc;
	struct regmap *regmap;
	struct mutex lock;
	int irq;
};

static void isl12057_rtc_regs_to_tm(struct rtc_time *tm, u8 *regs)
{
	tm->tm_sec = bcd2bin(regs[ISL12057_REG_RTC_SC]);
	tm->tm_min = bcd2bin(regs[ISL12057_REG_RTC_MN]);

	if (regs[ISL12057_REG_RTC_HR] & ISL12057_REG_RTC_HR_MIL) { /* AM/PM */
		tm->tm_hour = bcd2bin(regs[ISL12057_REG_RTC_HR] & 0x1f);
		if (regs[ISL12057_REG_RTC_HR] & ISL12057_REG_RTC_HR_PM)
			tm->tm_hour += 12;
	} else {					    /* 24 hour mode */
		tm->tm_hour = bcd2bin(regs[ISL12057_REG_RTC_HR] & 0x3f);
	}

	tm->tm_mday = bcd2bin(regs[ISL12057_REG_RTC_DT]);
	tm->tm_wday = bcd2bin(regs[ISL12057_REG_RTC_DW]) - 1; /* starts at 1 */
	tm->tm_mon  = bcd2bin(regs[ISL12057_REG_RTC_MO] & 0x1f) - 1; /* ditto */
	tm->tm_year = bcd2bin(regs[ISL12057_REG_RTC_YR]) + 100;

	/* Check if years register has overflown from 99 to 00 */
	if (regs[ISL12057_REG_RTC_MO] & ISL12057_REG_RTC_MO_CEN)
		tm->tm_year += 100;
}

static int isl12057_rtc_tm_to_regs(u8 *regs, struct rtc_time *tm)
{
	u8 century_bit;

	/*
	 * The clock has an 8 bit wide bcd-coded register for the year.
	 * It also has a century bit encoded in MO flag which provides
	 * information about overflow of year register from 99 to 00.
	 * tm_year is an offset from 1900 and we are interested in the
	 * 2000-2199 range, so any value less than 100 or larger than
	 * 299 is invalid.
	 */
	if (tm->tm_year < 100 || tm->tm_year > 299)
		return -EINVAL;

	century_bit = (tm->tm_year > 199) ? ISL12057_REG_RTC_MO_CEN : 0;

	regs[ISL12057_REG_RTC_SC] = bin2bcd(tm->tm_sec);
	regs[ISL12057_REG_RTC_MN] = bin2bcd(tm->tm_min);
	regs[ISL12057_REG_RTC_HR] = bin2bcd(tm->tm_hour); /* 24-hour format */
	regs[ISL12057_REG_RTC_DT] = bin2bcd(tm->tm_mday);
	regs[ISL12057_REG_RTC_MO] = bin2bcd(tm->tm_mon + 1) | century_bit;
	regs[ISL12057_REG_RTC_YR] = bin2bcd(tm->tm_year % 100);
	regs[ISL12057_REG_RTC_DW] = bin2bcd(tm->tm_wday + 1);

	return 0;
}

/*
 * Try and match register bits w/ fixed null values to see whether we
 * are dealing with an ISL12057. Note: this function is called early
 * during init and hence does need mutex protection.
 */
static int isl12057_i2c_validate_chip(struct regmap *regmap)
{
	u8 regs[ISL12057_MEM_MAP_LEN];
	static const u8 mask[ISL12057_MEM_MAP_LEN] = { 0x80, 0x80, 0x80, 0xf8,
						       0xc0, 0x60, 0x00, 0x00,
						       0x00, 0x00, 0x00, 0x00,
						       0x00, 0x00, 0x60, 0x7c };
	int ret, i;

	ret = regmap_bulk_read(regmap, 0, regs, ISL12057_MEM_MAP_LEN);
	if (ret)
		return ret;

	for (i = 0; i < ISL12057_MEM_MAP_LEN; ++i) {
		if (regs[i] & mask[i])	/* check if bits are cleared */
			return -ENODEV;
	}

	return 0;
}

static int _isl12057_rtc_clear_alarm(struct device *dev)
{
	struct isl12057_rtc_data *data = dev_get_drvdata(dev);
	int ret;

	ret = regmap_update_bits(data->regmap, ISL12057_REG_SR,
				 ISL12057_REG_SR_A1F, 0);
	if (ret)
		dev_err(dev, "%s: clearing alarm failed (%d)\n", __func__, ret);

	return ret;
}

static int _isl12057_rtc_update_alarm(struct device *dev, int enable)
{
	struct isl12057_rtc_data *data = dev_get_drvdata(dev);
	int ret;

	ret = regmap_update_bits(data->regmap, ISL12057_REG_INT,
				 ISL12057_REG_INT_A1IE,
				 enable ? ISL12057_REG_INT_A1IE : 0);
	if (ret)
		dev_err(dev, "%s: changing alarm interrupt flag failed (%d)\n",
			__func__, ret);

	return ret;
}

/*
 * Note: as we only read from device and do not perform any update, there is
 * no need for an equivalent function which would try and get driver's main
 * lock. Here, it is safe for everyone if we just use regmap internal lock
 * on the device when reading.
 */
static int _isl12057_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct isl12057_rtc_data *data = dev_get_drvdata(dev);
	u8 regs[ISL12057_RTC_SEC_LEN];
	unsigned int sr;
	int ret;

	ret = regmap_read(data->regmap, ISL12057_REG_SR, &sr);
	if (ret) {
		dev_err(dev, "%s: unable to read oscillator status flag (%d)\n",
			__func__, ret);
		goto out;
	} else {
		if (sr & ISL12057_REG_SR_OSF) {
			ret = -ENODATA;
			goto out;
		}
	}

	ret = regmap_bulk_read(data->regmap, ISL12057_REG_RTC_SC, regs,
			       ISL12057_RTC_SEC_LEN);
	if (ret)
		dev_err(dev, "%s: unable to read RTC time section (%d)\n",
			__func__, ret);

out:
	if (ret)
		return ret;

	isl12057_rtc_regs_to_tm(tm, regs);

	return rtc_valid_tm(tm);
}

static int isl12057_rtc_update_alarm(struct device *dev, int enable)
{
	struct isl12057_rtc_data *data = dev_get_drvdata(dev);
	int ret;

	mutex_lock(&data->lock);
	ret = _isl12057_rtc_update_alarm(dev, enable);
	mutex_unlock(&data->lock);

	return ret;
}

static int isl12057_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	struct isl12057_rtc_data *data = dev_get_drvdata(dev);
	struct rtc_time rtc_tm, *alarm_tm = &alarm->time;
	unsigned long rtc_secs, alarm_secs;
	u8 regs[ISL12057_A1_SEC_LEN];
	unsigned int ir;
	int ret;

	mutex_lock(&data->lock);
	ret = regmap_bulk_read(data->regmap, ISL12057_REG_A1_SC, regs,
			       ISL12057_A1_SEC_LEN);
	if (ret) {
		dev_err(dev, "%s: reading alarm section failed (%d)\n",
			__func__, ret);
		goto err_unlock;
	}

	alarm_tm->tm_sec  = bcd2bin(regs[0] & 0x7f);
	alarm_tm->tm_min  = bcd2bin(regs[1] & 0x7f);
	alarm_tm->tm_hour = bcd2bin(regs[2] & 0x3f);
	alarm_tm->tm_mday = bcd2bin(regs[3] & 0x3f);
	alarm_tm->tm_wday = -1;

	/*
	 * The alarm section does not store year/month. We use the ones in rtc
	 * section as a basis and increment month and then year if needed to get
	 * alarm after current time.
	 */
	ret = _isl12057_rtc_read_time(dev, &rtc_tm);
	if (ret)
		goto err_unlock;

	alarm_tm->tm_year = rtc_tm.tm_year;
	alarm_tm->tm_mon = rtc_tm.tm_mon;

	ret = rtc_tm_to_time(&rtc_tm, &rtc_secs);
	if (ret)
		goto err_unlock;

	ret = rtc_tm_to_time(alarm_tm, &alarm_secs);
	if (ret)
		goto err_unlock;

	if (alarm_secs < rtc_secs) {
		if (alarm_tm->tm_mon == 11) {
			alarm_tm->tm_mon = 0;
			alarm_tm->tm_year += 1;
		} else {
			alarm_tm->tm_mon += 1;
		}
	}

	ret = regmap_read(data->regmap, ISL12057_REG_INT, &ir);
	if (ret) {
		dev_err(dev, "%s: reading alarm interrupt flag failed (%d)\n",
			__func__, ret);
		goto err_unlock;
	}

	alarm->enabled = !!(ir & ISL12057_REG_INT_A1IE);

err_unlock:
	mutex_unlock(&data->lock);

	return ret;
}

static int isl12057_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	struct isl12057_rtc_data *data = dev_get_drvdata(dev);
	struct rtc_time *alarm_tm = &alarm->time;
	unsigned long rtc_secs, alarm_secs;
	u8 regs[ISL12057_A1_SEC_LEN];
	struct rtc_time rtc_tm;
	int ret, enable = 1;

	mutex_lock(&data->lock);
	ret = _isl12057_rtc_read_time(dev, &rtc_tm);
	if (ret)
		goto err_unlock;

	ret = rtc_tm_to_time(&rtc_tm, &rtc_secs);
	if (ret)
		goto err_unlock;

	ret = rtc_tm_to_time(alarm_tm, &alarm_secs);
	if (ret)
		goto err_unlock;

	/* If alarm time is before current time, disable the alarm */
	if (!alarm->enabled || alarm_secs <= rtc_secs) {
		enable = 0;
	} else {
		/*
		 * Chip only support alarms up to one month in the future. Let's
		 * return an error if we get something after that limit.
		 * Comparison is done by incrementing rtc_tm month field by one
		 * and checking alarm value is still below.
		 */
		if (rtc_tm.tm_mon == 11) { /* handle year wrapping */
			rtc_tm.tm_mon = 0;
			rtc_tm.tm_year += 1;
		} else {
			rtc_tm.tm_mon += 1;
		}

		ret = rtc_tm_to_time(&rtc_tm, &rtc_secs);
		if (ret)
			goto err_unlock;

		if (alarm_secs > rtc_secs) {
			dev_err(dev, "%s: max for alarm is one month (%d)\n",
				__func__, ret);
			ret = -EINVAL;
			goto err_unlock;
		}
	}

	/* Disable the alarm before modifying it */
	ret = _isl12057_rtc_update_alarm(dev, 0);
	if (ret < 0) {
		dev_err(dev, "%s: unable to disable the alarm (%d)\n",
			__func__, ret);
		goto err_unlock;
	}

	/* Program alarm registers */
	regs[0] = bin2bcd(alarm_tm->tm_sec) & 0x7f;
	regs[1] = bin2bcd(alarm_tm->tm_min) & 0x7f;
	regs[2] = bin2bcd(alarm_tm->tm_hour) & 0x3f;
	regs[3] = bin2bcd(alarm_tm->tm_mday) & 0x3f;

	ret = regmap_bulk_write(data->regmap, ISL12057_REG_A1_SC, regs,
				ISL12057_A1_SEC_LEN);
	if (ret < 0) {
		dev_err(dev, "%s: writing alarm section failed (%d)\n",
			__func__, ret);
		goto err_unlock;
	}

	/* Enable or disable alarm */
	ret = _isl12057_rtc_update_alarm(dev, enable);

err_unlock:
	mutex_unlock(&data->lock);

	return ret;
}

static int isl12057_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct isl12057_rtc_data *data = dev_get_drvdata(dev);
	u8 regs[ISL12057_RTC_SEC_LEN];
	int ret;

	ret = isl12057_rtc_tm_to_regs(regs, tm);
	if (ret)
		return ret;

	mutex_lock(&data->lock);
	ret = regmap_bulk_write(data->regmap, ISL12057_REG_RTC_SC, regs,
				ISL12057_RTC_SEC_LEN);
	if (ret) {
		dev_err(dev, "%s: unable to write RTC time section (%d)\n",
			__func__, ret);
		goto out;
	}

	/*
	 * Now that RTC time has been updated, let's clear oscillator
	 * failure flag, if needed.
	 */
	ret = regmap_update_bits(data->regmap, ISL12057_REG_SR,
				 ISL12057_REG_SR_OSF, 0);
	if (ret < 0)
		dev_err(dev, "%s: unable to clear osc. failure bit (%d)\n",
			__func__, ret);

out:
	mutex_unlock(&data->lock);

	return ret;
}

/*
 * Check current RTC status and enable/disable what needs to be. Return 0 if
 * everything went ok and a negative value upon error. Note: this function
 * is called early during init and hence does need mutex protection.
 */
static int isl12057_check_rtc_status(struct device *dev, struct regmap *regmap)
{
	int ret;

	/* Enable oscillator if not already running */
	ret = regmap_update_bits(regmap, ISL12057_REG_INT,
				 ISL12057_REG_INT_EOSC, 0);
	if (ret < 0) {
		dev_err(dev, "%s: unable to enable oscillator (%d)\n",
			__func__, ret);
		return ret;
	}

	/* Clear alarm bit if needed */
	ret = regmap_update_bits(regmap, ISL12057_REG_SR,
				 ISL12057_REG_SR_A1F, 0);
	if (ret < 0) {
		dev_err(dev, "%s: unable to clear alarm bit (%d)\n",
			__func__, ret);
		return ret;
	}

	return 0;
}

static int isl12057_rtc_alarm_irq_enable(struct device *dev,
					 unsigned int enable)
{
	struct isl12057_rtc_data *rtc_data = dev_get_drvdata(dev);
	int ret = -ENOTTY;

	if (rtc_data->irq)
		ret = isl12057_rtc_update_alarm(dev, enable);

	return ret;
}

static irqreturn_t isl12057_rtc_interrupt(int irq, void *data)
{
	struct i2c_client *client = data;
	struct isl12057_rtc_data *rtc_data = dev_get_drvdata(&client->dev);
	struct rtc_device *rtc = rtc_data->rtc;
	int ret, handled = IRQ_NONE;
	unsigned int sr;

	ret = regmap_read(rtc_data->regmap, ISL12057_REG_SR, &sr);
	if (!ret && (sr & ISL12057_REG_SR_A1F)) {
		dev_dbg(&client->dev, "RTC alarm!\n");

		rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);

		/* Acknowledge and disable the alarm */
		_isl12057_rtc_clear_alarm(&client->dev);
		_isl12057_rtc_update_alarm(&client->dev, 0);

		handled = IRQ_HANDLED;
	}

	return handled;
}

static const struct rtc_class_ops rtc_ops = {
	.read_time = _isl12057_rtc_read_time,
	.set_time = isl12057_rtc_set_time,
	.read_alarm = isl12057_rtc_read_alarm,
	.set_alarm = isl12057_rtc_set_alarm,
	.alarm_irq_enable = isl12057_rtc_alarm_irq_enable,
};

static struct regmap_config isl12057_rtc_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static int isl12057_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct isl12057_rtc_data *data;
	struct regmap *regmap;
	int ret;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
				     I2C_FUNC_SMBUS_BYTE_DATA |
				     I2C_FUNC_SMBUS_I2C_BLOCK))
		return -ENODEV;

	regmap = devm_regmap_init_i2c(client, &isl12057_rtc_regmap_config);
	if (IS_ERR(regmap)) {
		ret = PTR_ERR(regmap);
		dev_err(dev, "%s: regmap allocation failed (%d)\n",
			__func__, ret);
		return ret;
	}

	ret = isl12057_i2c_validate_chip(regmap);
	if (ret)
		return ret;

	ret = isl12057_check_rtc_status(dev, regmap);
	if (ret)
		return ret;

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

	mutex_init(&data->lock);
	data->regmap = regmap;
	dev_set_drvdata(dev, data);

	if (client->irq > 0) {
		ret = devm_request_threaded_irq(dev, client->irq, NULL,
						isl12057_rtc_interrupt,
						IRQF_SHARED|IRQF_ONESHOT,
						DRV_NAME, client);
		if (!ret)
			data->irq = client->irq;
		else
			dev_err(dev, "%s: irq %d unavailable (%d)\n", __func__,
				client->irq, ret);
	}

	device_init_wakeup(dev, !!data->irq);

	data->rtc = devm_rtc_device_register(dev, DRV_NAME, &rtc_ops,
					     THIS_MODULE);
	ret = PTR_ERR_OR_ZERO(data->rtc);
	if (ret) {
		dev_err(dev, "%s: unable to register RTC device (%d)\n",
			__func__, ret);
		goto err;
	}

	/* We cannot support UIE mode if we do not have an IRQ line */
	if (!data->irq)
		data->rtc->uie_unsupported = 1;

err:
	return ret;
}

static int isl12057_remove(struct i2c_client *client)
{
	struct isl12057_rtc_data *rtc_data = dev_get_drvdata(&client->dev);

	if (rtc_data->irq)
		device_init_wakeup(&client->dev, false);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int isl12057_rtc_suspend(struct device *dev)
{
	struct isl12057_rtc_data *rtc_data = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		return enable_irq_wake(rtc_data->irq);

	return 0;
}

static int isl12057_rtc_resume(struct device *dev)
{
	struct isl12057_rtc_data *rtc_data = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		return disable_irq_wake(rtc_data->irq);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(isl12057_rtc_pm_ops, isl12057_rtc_suspend,
			 isl12057_rtc_resume);

#ifdef CONFIG_OF
static const struct of_device_id isl12057_dt_match[] = {
	{ .compatible = "isl,isl12057" },
	{ },
};
#endif

static const struct i2c_device_id isl12057_id[] = {
	{ "isl12057", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, isl12057_id);

static struct i2c_driver isl12057_driver = {
	.driver = {
		.name = DRV_NAME,
		.owner = THIS_MODULE,
		.pm = &isl12057_rtc_pm_ops,
		.of_match_table = of_match_ptr(isl12057_dt_match),
	},
	.probe	  = isl12057_probe,
	.remove	  = isl12057_remove,
	.id_table = isl12057_id,
};
module_i2c_driver(isl12057_driver);

MODULE_AUTHOR("Arnaud EBALARD <arno@natisbad.org>");
MODULE_DESCRIPTION("Intersil ISL12057 RTC driver");
MODULE_LICENSE("GPL");