1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Real Time Clock driver for AB-RTCMC-32.768kHz-EOZ9 chip.
4  * Copyright (C) 2019 Orolia
5  *
6  */
7 
8 #include <linux/module.h>
9 #include <linux/rtc.h>
10 #include <linux/i2c.h>
11 #include <linux/bcd.h>
12 #include <linux/of.h>
13 #include <linux/regmap.h>
14 #include <linux/bitfield.h>
15 #include <linux/hwmon.h>
16 #include <linux/hwmon-sysfs.h>
17 
18 #define ABEOZ9_REG_CTRL1		0x00
19 #define ABEOZ9_REG_CTRL1_MASK		GENMASK(7, 0)
20 #define ABEOZ9_REG_CTRL1_WE		BIT(0)
21 #define ABEOZ9_REG_CTRL1_TE		BIT(1)
22 #define ABEOZ9_REG_CTRL1_TAR		BIT(2)
23 #define ABEOZ9_REG_CTRL1_EERE		BIT(3)
24 #define ABEOZ9_REG_CTRL1_SRON		BIT(4)
25 #define ABEOZ9_REG_CTRL1_TD0		BIT(5)
26 #define ABEOZ9_REG_CTRL1_TD1		BIT(6)
27 #define ABEOZ9_REG_CTRL1_CLKINT		BIT(7)
28 
29 #define ABEOZ9_REG_CTRL_INT		0x01
30 #define ABEOZ9_REG_CTRL_INT_AIE		BIT(0)
31 #define ABEOZ9_REG_CTRL_INT_TIE		BIT(1)
32 #define ABEOZ9_REG_CTRL_INT_V1IE	BIT(2)
33 #define ABEOZ9_REG_CTRL_INT_V2IE	BIT(3)
34 #define ABEOZ9_REG_CTRL_INT_SRIE	BIT(4)
35 
36 #define ABEOZ9_REG_CTRL_INT_FLAG	0x02
37 #define ABEOZ9_REG_CTRL_INT_FLAG_AF	BIT(0)
38 #define ABEOZ9_REG_CTRL_INT_FLAG_TF	BIT(1)
39 #define ABEOZ9_REG_CTRL_INT_FLAG_V1IF	BIT(2)
40 #define ABEOZ9_REG_CTRL_INT_FLAG_V2IF	BIT(3)
41 #define ABEOZ9_REG_CTRL_INT_FLAG_SRF	BIT(4)
42 
43 #define ABEOZ9_REG_CTRL_STATUS		0x03
44 #define ABEOZ9_REG_CTRL_STATUS_V1F	BIT(2)
45 #define ABEOZ9_REG_CTRL_STATUS_V2F	BIT(3)
46 #define ABEOZ9_REG_CTRL_STATUS_SR	BIT(4)
47 #define ABEOZ9_REG_CTRL_STATUS_PON	BIT(5)
48 #define ABEOZ9_REG_CTRL_STATUS_EEBUSY	BIT(7)
49 
50 #define ABEOZ9_REG_SEC			0x08
51 #define ABEOZ9_REG_MIN			0x09
52 #define ABEOZ9_REG_HOURS		0x0A
53 #define ABEOZ9_HOURS_PM			BIT(6)
54 #define ABEOZ9_REG_DAYS			0x0B
55 #define ABEOZ9_REG_WEEKDAYS		0x0C
56 #define ABEOZ9_REG_MONTHS		0x0D
57 #define ABEOZ9_REG_YEARS		0x0E
58 
59 #define ABEOZ9_SEC_LEN			7
60 
61 #define ABEOZ9_REG_ALARM_SEC		0x10
62 #define ABEOZ9_BIT_ALARM_SEC		GENMASK(6, 0)
63 #define ABEOZ9_REG_ALARM_MIN		0x11
64 #define ABEOZ9_BIT_ALARM_MIN		GENMASK(6, 0)
65 #define ABEOZ9_REG_ALARM_HOURS		0x12
66 #define ABEOZ9_BIT_ALARM_HOURS_PM	BIT(5)
67 #define ABEOZ9_BIT_ALARM_HOURS		GENMASK(4, 0)
68 #define ABEOZ9_REG_ALARM_DAYS		0x13
69 #define ABEOZ9_BIT_ALARM_DAYS		GENMASK(5, 0)
70 #define ABEOZ9_REG_ALARM_WEEKDAYS	0x14
71 #define ABEOZ9_BIT_ALARM_WEEKDAYS	GENMASK(2, 0)
72 #define ABEOZ9_REG_ALARM_MONTHS		0x15
73 #define ABEOZ9_BIT_ALARM_MONTHS		GENMASK(4, 0)
74 #define ABEOZ9_REG_ALARM_YEARS		0x16
75 
76 #define ABEOZ9_ALARM_LEN		7
77 #define ABEOZ9_BIT_ALARM_AE		BIT(7)
78 
79 #define ABEOZ9_REG_REG_TEMP		0x20
80 #define ABEOZ953_TEMP_MAX		120
81 #define ABEOZ953_TEMP_MIN		-60
82 
83 #define ABEOZ9_REG_EEPROM		0x30
84 #define ABEOZ9_REG_EEPROM_MASK		GENMASK(8, 0)
85 #define ABEOZ9_REG_EEPROM_THP		BIT(0)
86 #define ABEOZ9_REG_EEPROM_THE		BIT(1)
87 #define ABEOZ9_REG_EEPROM_FD0		BIT(2)
88 #define ABEOZ9_REG_EEPROM_FD1		BIT(3)
89 #define ABEOZ9_REG_EEPROM_R1K		BIT(4)
90 #define ABEOZ9_REG_EEPROM_R5K		BIT(5)
91 #define ABEOZ9_REG_EEPROM_R20K		BIT(6)
92 #define ABEOZ9_REG_EEPROM_R80K		BIT(7)
93 
94 struct abeoz9_rtc_data {
95 	struct rtc_device *rtc;
96 	struct regmap *regmap;
97 	struct device *hwmon_dev;
98 };
99 
abeoz9_check_validity(struct device * dev)100 static int abeoz9_check_validity(struct device *dev)
101 {
102 	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
103 	struct regmap *regmap = data->regmap;
104 	int ret;
105 	int val;
106 
107 	ret = regmap_read(regmap, ABEOZ9_REG_CTRL_STATUS, &val);
108 	if (ret < 0) {
109 		dev_err(dev,
110 			"unable to get CTRL_STATUS register (%d)\n", ret);
111 		return ret;
112 	}
113 
114 	if (val & ABEOZ9_REG_CTRL_STATUS_PON) {
115 		dev_warn(dev, "power-on reset detected, date is invalid\n");
116 		return -EINVAL;
117 	}
118 
119 	if (val & ABEOZ9_REG_CTRL_STATUS_V1F) {
120 		dev_warn(dev,
121 			 "voltage drops below VLOW1 threshold, date is invalid\n");
122 		return -EINVAL;
123 	}
124 
125 	if ((val & ABEOZ9_REG_CTRL_STATUS_V2F)) {
126 		dev_warn(dev,
127 			 "voltage drops below VLOW2 threshold, date is invalid\n");
128 		return -EINVAL;
129 	}
130 
131 	return 0;
132 }
133 
abeoz9_reset_validity(struct regmap * regmap)134 static int abeoz9_reset_validity(struct regmap *regmap)
135 {
136 	return regmap_update_bits(regmap, ABEOZ9_REG_CTRL_STATUS,
137 				  ABEOZ9_REG_CTRL_STATUS_V1F |
138 				  ABEOZ9_REG_CTRL_STATUS_V2F |
139 				  ABEOZ9_REG_CTRL_STATUS_PON,
140 				  0);
141 }
142 
abeoz9_rtc_get_time(struct device * dev,struct rtc_time * tm)143 static int abeoz9_rtc_get_time(struct device *dev, struct rtc_time *tm)
144 {
145 	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
146 	u8 regs[ABEOZ9_SEC_LEN];
147 	int ret;
148 
149 	ret = abeoz9_check_validity(dev);
150 	if (ret)
151 		return ret;
152 
153 	ret = regmap_bulk_read(data->regmap, ABEOZ9_REG_SEC,
154 			       regs,
155 			       sizeof(regs));
156 	if (ret) {
157 		dev_err(dev, "reading RTC time failed (%d)\n", ret);
158 		return ret;
159 	}
160 
161 	tm->tm_sec = bcd2bin(regs[ABEOZ9_REG_SEC - ABEOZ9_REG_SEC] & 0x7F);
162 	tm->tm_min = bcd2bin(regs[ABEOZ9_REG_MIN - ABEOZ9_REG_SEC] & 0x7F);
163 
164 	if (regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & ABEOZ9_HOURS_PM) {
165 		tm->tm_hour =
166 			bcd2bin(regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & 0x1f);
167 		if (regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & ABEOZ9_HOURS_PM)
168 			tm->tm_hour += 12;
169 	} else {
170 		tm->tm_hour = bcd2bin(regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC]);
171 	}
172 
173 	tm->tm_mday = bcd2bin(regs[ABEOZ9_REG_DAYS - ABEOZ9_REG_SEC]);
174 	tm->tm_wday = bcd2bin(regs[ABEOZ9_REG_WEEKDAYS - ABEOZ9_REG_SEC]);
175 	tm->tm_mon  = bcd2bin(regs[ABEOZ9_REG_MONTHS - ABEOZ9_REG_SEC]) - 1;
176 	tm->tm_year = bcd2bin(regs[ABEOZ9_REG_YEARS - ABEOZ9_REG_SEC]) + 100;
177 
178 	return ret;
179 }
180 
abeoz9_rtc_set_time(struct device * dev,struct rtc_time * tm)181 static int abeoz9_rtc_set_time(struct device *dev, struct rtc_time *tm)
182 {
183 	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
184 	struct regmap *regmap = data->regmap;
185 	u8 regs[ABEOZ9_SEC_LEN];
186 	int ret;
187 
188 	regs[ABEOZ9_REG_SEC - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_sec);
189 	regs[ABEOZ9_REG_MIN - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_min);
190 	regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_hour);
191 	regs[ABEOZ9_REG_DAYS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_mday);
192 	regs[ABEOZ9_REG_WEEKDAYS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_wday);
193 	regs[ABEOZ9_REG_MONTHS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_mon + 1);
194 	regs[ABEOZ9_REG_YEARS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_year - 100);
195 
196 	ret = regmap_bulk_write(data->regmap, ABEOZ9_REG_SEC,
197 				regs,
198 				sizeof(regs));
199 
200 	if (ret) {
201 		dev_err(dev, "set RTC time failed (%d)\n", ret);
202 		return ret;
203 	}
204 
205 	return abeoz9_reset_validity(regmap);
206 }
207 
abeoz9_rtc_read_alarm(struct device * dev,struct rtc_wkalrm * alarm)208 static int abeoz9_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
209 {
210 	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
211 	struct regmap *regmap = data->regmap;
212 	u8 regs[ABEOZ9_ALARM_LEN];
213 	u8 val[2];
214 	int ret;
215 
216 	ret = abeoz9_check_validity(dev);
217 	if (ret)
218 		return ret;
219 
220 	ret = regmap_bulk_read(regmap, ABEOZ9_REG_CTRL_INT, val, sizeof(val));
221 	if (ret)
222 		return ret;
223 
224 	alarm->enabled = val[0] & ABEOZ9_REG_CTRL_INT_AIE;
225 	alarm->pending = val[1] & ABEOZ9_REG_CTRL_INT_FLAG_AF;
226 
227 	ret = regmap_bulk_read(regmap, ABEOZ9_REG_ALARM_SEC, regs, sizeof(regs));
228 	if (ret)
229 		return ret;
230 
231 	alarm->time.tm_sec = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_SEC, regs[0]));
232 	alarm->time.tm_min = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_MIN, regs[1]));
233 	alarm->time.tm_hour = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_HOURS, regs[2]));
234 	if (FIELD_GET(ABEOZ9_BIT_ALARM_HOURS_PM, regs[2]))
235 		alarm->time.tm_hour += 12;
236 
237 	alarm->time.tm_mday = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_DAYS, regs[3]));
238 
239 	return 0;
240 }
241 
abeoz9_rtc_alarm_irq_enable(struct device * dev,u32 enable)242 static int abeoz9_rtc_alarm_irq_enable(struct device *dev, u32 enable)
243 {
244 	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
245 
246 	return regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT,
247 				  ABEOZ9_REG_CTRL_INT_AIE,
248 				  FIELD_PREP(ABEOZ9_REG_CTRL_INT_AIE, enable));
249 }
250 
abeoz9_rtc_set_alarm(struct device * dev,struct rtc_wkalrm * alarm)251 static int abeoz9_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
252 {
253 	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
254 	u8 regs[ABEOZ9_ALARM_LEN] = {0};
255 	int ret;
256 
257 	ret = regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG,
258 				 ABEOZ9_REG_CTRL_INT_FLAG_AF, 0);
259 	if (ret)
260 		return ret;
261 
262 	regs[0] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_SEC,
263 						   bin2bcd(alarm->time.tm_sec));
264 	regs[1] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_MIN,
265 						   bin2bcd(alarm->time.tm_min));
266 	regs[2] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_HOURS,
267 						   bin2bcd(alarm->time.tm_hour));
268 	regs[3] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_DAYS,
269 						   bin2bcd(alarm->time.tm_mday));
270 
271 	ret = regmap_bulk_write(data->regmap, ABEOZ9_REG_ALARM_SEC, regs,
272 				sizeof(regs));
273 	if (ret)
274 		return ret;
275 
276 	return abeoz9_rtc_alarm_irq_enable(dev, alarm->enabled);
277 }
278 
abeoz9_rtc_irq(int irq,void * dev)279 static irqreturn_t abeoz9_rtc_irq(int irq, void *dev)
280 {
281 	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
282 	unsigned int val;
283 	int ret;
284 
285 	ret = regmap_read(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG, &val);
286 	if (ret)
287 		return IRQ_NONE;
288 
289 	if (!FIELD_GET(ABEOZ9_REG_CTRL_INT_FLAG_AF, val))
290 		return IRQ_NONE;
291 
292 	regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG,
293 			   ABEOZ9_REG_CTRL_INT_FLAG_AF, 0);
294 
295 	rtc_update_irq(data->rtc, 1, RTC_IRQF | RTC_AF);
296 
297 	return IRQ_HANDLED;
298 }
299 
abeoz9_trickle_parse_dt(struct device_node * node)300 static int abeoz9_trickle_parse_dt(struct device_node *node)
301 {
302 	u32 ohms = 0;
303 
304 	if (of_property_read_u32(node, "trickle-resistor-ohms", &ohms))
305 		return 0;
306 
307 	switch (ohms) {
308 	case 1000:
309 		return ABEOZ9_REG_EEPROM_R1K;
310 	case 5000:
311 		return ABEOZ9_REG_EEPROM_R5K;
312 	case 20000:
313 		return ABEOZ9_REG_EEPROM_R20K;
314 	case 80000:
315 		return ABEOZ9_REG_EEPROM_R80K;
316 	default:
317 		return 0;
318 	}
319 }
320 
abeoz9_rtc_setup(struct device * dev,struct device_node * node)321 static int abeoz9_rtc_setup(struct device *dev, struct device_node *node)
322 {
323 	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
324 	struct regmap *regmap = data->regmap;
325 	int ret;
326 
327 	/* Enable Self Recovery, Clock for Watch and EEPROM refresh functions */
328 	ret = regmap_update_bits(regmap, ABEOZ9_REG_CTRL1,
329 				 ABEOZ9_REG_CTRL1_MASK,
330 				 ABEOZ9_REG_CTRL1_WE |
331 				 ABEOZ9_REG_CTRL1_EERE |
332 				 ABEOZ9_REG_CTRL1_SRON);
333 	if (ret < 0) {
334 		dev_err(dev, "unable to set CTRL_1 register (%d)\n", ret);
335 		return ret;
336 	}
337 
338 	ret = regmap_write(regmap, ABEOZ9_REG_CTRL_INT, 0);
339 	if (ret < 0) {
340 		dev_err(dev,
341 			"unable to set control CTRL_INT register (%d)\n",
342 			ret);
343 		return ret;
344 	}
345 
346 	ret = regmap_write(regmap, ABEOZ9_REG_CTRL_INT_FLAG, 0);
347 	if (ret < 0) {
348 		dev_err(dev,
349 			"unable to set control CTRL_INT_FLAG register (%d)\n",
350 			ret);
351 		return ret;
352 	}
353 
354 	ret = abeoz9_trickle_parse_dt(node);
355 
356 	/* Enable built-in termometer */
357 	ret |= ABEOZ9_REG_EEPROM_THE;
358 
359 	ret = regmap_update_bits(regmap, ABEOZ9_REG_EEPROM,
360 				 ABEOZ9_REG_EEPROM_MASK,
361 				 ret);
362 	if (ret < 0) {
363 		dev_err(dev, "unable to set EEPROM register (%d)\n", ret);
364 		return ret;
365 	}
366 
367 	return ret;
368 }
369 
370 static const struct rtc_class_ops rtc_ops = {
371 	.read_time = abeoz9_rtc_get_time,
372 	.set_time = abeoz9_rtc_set_time,
373 	.read_alarm = abeoz9_rtc_read_alarm,
374 	.set_alarm = abeoz9_rtc_set_alarm,
375 	.alarm_irq_enable = abeoz9_rtc_alarm_irq_enable,
376 };
377 
378 static const struct regmap_config abeoz9_rtc_regmap_config = {
379 	.reg_bits = 8,
380 	.val_bits = 8,
381 	.max_register = 0x3f,
382 };
383 
384 #if IS_REACHABLE(CONFIG_HWMON)
385 
abeoz9z3_temp_read(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long * temp)386 static int abeoz9z3_temp_read(struct device *dev,
387 			      enum hwmon_sensor_types type,
388 			      u32 attr, int channel, long *temp)
389 {
390 	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
391 	struct regmap *regmap = data->regmap;
392 	int ret;
393 	unsigned int val;
394 
395 	ret = regmap_read(regmap, ABEOZ9_REG_CTRL_STATUS, &val);
396 	if (ret < 0)
397 		return ret;
398 
399 	if ((val & ABEOZ9_REG_CTRL_STATUS_V1F) ||
400 	    (val & ABEOZ9_REG_CTRL_STATUS_V2F)) {
401 		dev_err(dev,
402 			"thermometer might be disabled due to low voltage\n");
403 		return -EINVAL;
404 	}
405 
406 	switch (attr) {
407 	case hwmon_temp_input:
408 		ret = regmap_read(regmap, ABEOZ9_REG_REG_TEMP, &val);
409 		if (ret < 0)
410 			return ret;
411 		*temp = 1000 * (val + ABEOZ953_TEMP_MIN);
412 		return 0;
413 	case hwmon_temp_max:
414 		*temp = 1000 * ABEOZ953_TEMP_MAX;
415 		return 0;
416 	case hwmon_temp_min:
417 		*temp = 1000 * ABEOZ953_TEMP_MIN;
418 		return 0;
419 	default:
420 		return -EOPNOTSUPP;
421 	}
422 }
423 
abeoz9_is_visible(const void * data,enum hwmon_sensor_types type,u32 attr,int channel)424 static umode_t abeoz9_is_visible(const void *data,
425 				 enum hwmon_sensor_types type,
426 				 u32 attr, int channel)
427 {
428 	switch (attr) {
429 	case hwmon_temp_input:
430 	case hwmon_temp_max:
431 	case hwmon_temp_min:
432 		return 0444;
433 	default:
434 		return 0;
435 	}
436 }
437 
438 static const u32 abeoz9_chip_config[] = {
439 	HWMON_C_REGISTER_TZ,
440 	0
441 };
442 
443 static const struct hwmon_channel_info abeoz9_chip = {
444 	.type = hwmon_chip,
445 	.config = abeoz9_chip_config,
446 };
447 
448 static const u32 abeoz9_temp_config[] = {
449 	HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN,
450 	0
451 };
452 
453 static const struct hwmon_channel_info abeoz9_temp = {
454 	.type = hwmon_temp,
455 	.config = abeoz9_temp_config,
456 };
457 
458 static const struct hwmon_channel_info *abeoz9_info[] = {
459 	&abeoz9_chip,
460 	&abeoz9_temp,
461 	NULL
462 };
463 
464 static const struct hwmon_ops abeoz9_hwmon_ops = {
465 	.is_visible = abeoz9_is_visible,
466 	.read = abeoz9z3_temp_read,
467 };
468 
469 static const struct hwmon_chip_info abeoz9_chip_info = {
470 	.ops = &abeoz9_hwmon_ops,
471 	.info = abeoz9_info,
472 };
473 
abeoz9_hwmon_register(struct device * dev,struct abeoz9_rtc_data * data)474 static void abeoz9_hwmon_register(struct device *dev,
475 				  struct abeoz9_rtc_data *data)
476 {
477 	data->hwmon_dev =
478 		devm_hwmon_device_register_with_info(dev,
479 						     "abeoz9",
480 						     data,
481 						     &abeoz9_chip_info,
482 						     NULL);
483 	if (IS_ERR(data->hwmon_dev)) {
484 		dev_warn(dev, "unable to register hwmon device %ld\n",
485 			 PTR_ERR(data->hwmon_dev));
486 	}
487 }
488 
489 #else
490 
abeoz9_hwmon_register(struct device * dev,struct abeoz9_rtc_data * data)491 static void abeoz9_hwmon_register(struct device *dev,
492 				  struct abeoz9_rtc_data *data)
493 {
494 }
495 
496 #endif
497 
abeoz9_probe(struct i2c_client * client,const struct i2c_device_id * id)498 static int abeoz9_probe(struct i2c_client *client,
499 			const struct i2c_device_id *id)
500 {
501 	struct abeoz9_rtc_data *data = NULL;
502 	struct device *dev = &client->dev;
503 	struct regmap *regmap;
504 	int ret;
505 
506 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
507 				     I2C_FUNC_SMBUS_BYTE_DATA |
508 				     I2C_FUNC_SMBUS_I2C_BLOCK))
509 		return -ENODEV;
510 
511 	regmap = devm_regmap_init_i2c(client, &abeoz9_rtc_regmap_config);
512 	if (IS_ERR(regmap)) {
513 		ret = PTR_ERR(regmap);
514 		dev_err(dev, "regmap allocation failed: %d\n", ret);
515 		return ret;
516 	}
517 
518 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
519 	if (!data)
520 		return -ENOMEM;
521 
522 	data->regmap = regmap;
523 	dev_set_drvdata(dev, data);
524 
525 	ret = abeoz9_rtc_setup(dev, client->dev.of_node);
526 	if (ret)
527 		return ret;
528 
529 	data->rtc = devm_rtc_allocate_device(dev);
530 	ret = PTR_ERR_OR_ZERO(data->rtc);
531 	if (ret)
532 		return ret;
533 
534 	data->rtc->ops = &rtc_ops;
535 	data->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
536 	data->rtc->range_max = RTC_TIMESTAMP_END_2099;
537 	clear_bit(RTC_FEATURE_ALARM, data->rtc->features);
538 
539 	if (client->irq > 0) {
540 		ret = devm_request_threaded_irq(dev, client->irq, NULL,
541 						abeoz9_rtc_irq,
542 						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
543 						dev_name(dev), dev);
544 		if (ret) {
545 			dev_err(dev, "failed to request alarm irq\n");
546 			return ret;
547 		}
548 	} else {
549 		clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, data->rtc->features);
550 	}
551 
552 	if (client->irq > 0 || device_property_read_bool(dev, "wakeup-source")) {
553 		ret = device_init_wakeup(dev, true);
554 		set_bit(RTC_FEATURE_ALARM, data->rtc->features);
555 	}
556 
557 	ret = devm_rtc_register_device(data->rtc);
558 	if (ret)
559 		return ret;
560 
561 	abeoz9_hwmon_register(dev, data);
562 	return 0;
563 }
564 
565 #ifdef CONFIG_OF
566 static const struct of_device_id abeoz9_dt_match[] = {
567 	{ .compatible = "abracon,abeoz9" },
568 	{ },
569 };
570 MODULE_DEVICE_TABLE(of, abeoz9_dt_match);
571 #endif
572 
573 static const struct i2c_device_id abeoz9_id[] = {
574 	{ "abeoz9", 0 },
575 	{ }
576 };
577 
578 static struct i2c_driver abeoz9_driver = {
579 	.driver = {
580 		.name = "rtc-ab-eoz9",
581 		.of_match_table = of_match_ptr(abeoz9_dt_match),
582 	},
583 	.probe	  = abeoz9_probe,
584 	.id_table = abeoz9_id,
585 };
586 
587 module_i2c_driver(abeoz9_driver);
588 
589 MODULE_AUTHOR("Artem Panfilov <panfilov.artyom@gmail.com>");
590 MODULE_DESCRIPTION("Abracon AB-RTCMC-32.768kHz-EOZ9 RTC driver");
591 MODULE_LICENSE("GPL");
592