rtc-ab-eoz9.c

  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(5, 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
 94struct abeoz9_rtc_data {
 95	struct rtc_device *rtc;
 96	struct regmap *regmap;
 97	struct device *hwmon_dev;
 98};
 99
100static 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
134static 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
143static 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
181static 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
208static 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
235	alarm->time.tm_mday = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_DAYS, regs[3]));
236
237	return 0;
238}
239
240static int abeoz9_rtc_alarm_irq_enable(struct device *dev, u32 enable)
241{
242	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
243
244	return regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT,
245				  ABEOZ9_REG_CTRL_INT_AIE,
246				  FIELD_PREP(ABEOZ9_REG_CTRL_INT_AIE, enable));
247}
248
249static int abeoz9_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
250{
251	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
252	u8 regs[ABEOZ9_ALARM_LEN] = {0};
253	int ret;
254
255	ret = regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG,
256				 ABEOZ9_REG_CTRL_INT_FLAG_AF, 0);
257	if (ret)
258		return ret;
259
260	regs[0] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_SEC,
261						   bin2bcd(alarm->time.tm_sec));
262	regs[1] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_MIN,
263						   bin2bcd(alarm->time.tm_min));
264	regs[2] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_HOURS,
265						   bin2bcd(alarm->time.tm_hour));
266	regs[3] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_DAYS,
267						   bin2bcd(alarm->time.tm_mday));
268
269	ret = regmap_bulk_write(data->regmap, ABEOZ9_REG_ALARM_SEC, regs,
270				sizeof(regs));
271	if (ret)
272		return ret;
273
274	return abeoz9_rtc_alarm_irq_enable(dev, alarm->enabled);
275}
276
277static irqreturn_t abeoz9_rtc_irq(int irq, void *dev)
278{
279	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
280	unsigned int val;
281	int ret;
282
283	ret = regmap_read(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG, &val);
284	if (ret)
285		return IRQ_NONE;
286
287	if (!FIELD_GET(ABEOZ9_REG_CTRL_INT_FLAG_AF, val))
288		return IRQ_NONE;
289
290	regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG,
291			   ABEOZ9_REG_CTRL_INT_FLAG_AF, 0);
292
293	rtc_update_irq(data->rtc, 1, RTC_IRQF | RTC_AF);
294
295	return IRQ_HANDLED;
296}
297
298static int abeoz9_trickle_parse_dt(struct device_node *node)
299{
300	u32 ohms = 0;
301
302	if (of_property_read_u32(node, "trickle-resistor-ohms", &ohms))
303		return 0;
304
305	switch (ohms) {
306	case 1000:
307		return ABEOZ9_REG_EEPROM_R1K;
308	case 5000:
309		return ABEOZ9_REG_EEPROM_R5K;
310	case 20000:
311		return ABEOZ9_REG_EEPROM_R20K;
312	case 80000:
313		return ABEOZ9_REG_EEPROM_R80K;
314	default:
315		return 0;
316	}
317}
318
319static int abeoz9_rtc_setup(struct device *dev, struct device_node *node)
320{
321	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
322	struct regmap *regmap = data->regmap;
323	int ret;
324
325	/* Enable Self Recovery, Clock for Watch and EEPROM refresh functions */
326	ret = regmap_update_bits(regmap, ABEOZ9_REG_CTRL1,
327				 ABEOZ9_REG_CTRL1_MASK,
328				 ABEOZ9_REG_CTRL1_WE |
329				 ABEOZ9_REG_CTRL1_EERE |
330				 ABEOZ9_REG_CTRL1_SRON);
331	if (ret < 0) {
332		dev_err(dev, "unable to set CTRL_1 register (%d)\n", ret);
333		return ret;
334	}
335
336	ret = regmap_write(regmap, ABEOZ9_REG_CTRL_INT, 0);
337	if (ret < 0) {
338		dev_err(dev,
339			"unable to set control CTRL_INT register (%d)\n",
340			ret);
341		return ret;
342	}
343
344	ret = regmap_write(regmap, ABEOZ9_REG_CTRL_INT_FLAG, 0);
345	if (ret < 0) {
346		dev_err(dev,
347			"unable to set control CTRL_INT_FLAG register (%d)\n",
348			ret);
349		return ret;
350	}
351
352	ret = abeoz9_trickle_parse_dt(node);
353
354	/* Enable built-in termometer */
355	ret |= ABEOZ9_REG_EEPROM_THE;
356
357	ret = regmap_update_bits(regmap, ABEOZ9_REG_EEPROM,
358				 ABEOZ9_REG_EEPROM_MASK,
359				 ret);
360	if (ret < 0) {
361		dev_err(dev, "unable to set EEPROM register (%d)\n", ret);
362		return ret;
363	}
364
365	return ret;
366}
367
368static const struct rtc_class_ops rtc_ops = {
369	.read_time = abeoz9_rtc_get_time,
370	.set_time = abeoz9_rtc_set_time,
371	.read_alarm = abeoz9_rtc_read_alarm,
372	.set_alarm = abeoz9_rtc_set_alarm,
373	.alarm_irq_enable = abeoz9_rtc_alarm_irq_enable,
374};
375
376static const struct regmap_config abeoz9_rtc_regmap_config = {
377	.reg_bits = 8,
378	.val_bits = 8,
379	.max_register = 0x3f,
380};
381
382#if IS_REACHABLE(CONFIG_HWMON)
383
384static int abeoz9z3_temp_read(struct device *dev,
385			      enum hwmon_sensor_types type,
386			      u32 attr, int channel, long *temp)
387{
388	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
389	struct regmap *regmap = data->regmap;
390	int ret;
391	unsigned int val;
392
393	ret = regmap_read(regmap, ABEOZ9_REG_CTRL_STATUS, &val);
394	if (ret < 0)
395		return ret;
396
397	switch (attr) {
398	case hwmon_temp_input:
399		ret = regmap_read(regmap, ABEOZ9_REG_REG_TEMP, &val);
400		if (ret < 0)
401			return ret;
402		*temp = 1000 * (val + ABEOZ953_TEMP_MIN);
403		return 0;
404	case hwmon_temp_max:
405		*temp = 1000 * ABEOZ953_TEMP_MAX;
406		return 0;
407	case hwmon_temp_min:
408		*temp = 1000 * ABEOZ953_TEMP_MIN;
409		return 0;
410	default:
411		return -EOPNOTSUPP;
412	}
413}
414
415static umode_t abeoz9_is_visible(const void *data,
416				 enum hwmon_sensor_types type,
417				 u32 attr, int channel)
418{
419	switch (attr) {
420	case hwmon_temp_input:
421	case hwmon_temp_max:
422	case hwmon_temp_min:
423		return 0444;
424	default:
425		return 0;
426	}
427}
428
429static const struct hwmon_channel_info * const abeoz9_info[] = {
430	HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
431	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN),
432	NULL
433};
434
435static const struct hwmon_ops abeoz9_hwmon_ops = {
436	.is_visible = abeoz9_is_visible,
437	.read = abeoz9z3_temp_read,
438};
439
440static const struct hwmon_chip_info abeoz9_chip_info = {
441	.ops = &abeoz9_hwmon_ops,
442	.info = abeoz9_info,
443};
444
445static void abeoz9_hwmon_register(struct device *dev,
446				  struct abeoz9_rtc_data *data)
447{
448	data->hwmon_dev =
449		devm_hwmon_device_register_with_info(dev,
450						     "abeoz9",
451						     data,
452						     &abeoz9_chip_info,
453						     NULL);
454	if (IS_ERR(data->hwmon_dev)) {
455		dev_warn(dev, "unable to register hwmon device %ld\n",
456			 PTR_ERR(data->hwmon_dev));
457	}
458}
459
460#else
461
462static void abeoz9_hwmon_register(struct device *dev,
463				  struct abeoz9_rtc_data *data)
464{
465}
466
467#endif
468
469static int abeoz9_probe(struct i2c_client *client)
470{
471	struct abeoz9_rtc_data *data = NULL;
472	struct device *dev = &client->dev;
473	struct regmap *regmap;
474	int ret;
475
476	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
477				     I2C_FUNC_SMBUS_BYTE_DATA |
478				     I2C_FUNC_SMBUS_I2C_BLOCK))
479		return -ENODEV;
480
481	regmap = devm_regmap_init_i2c(client, &abeoz9_rtc_regmap_config);
482	if (IS_ERR(regmap)) {
483		ret = PTR_ERR(regmap);
484		dev_err(dev, "regmap allocation failed: %d\n", ret);
485		return ret;
486	}
487
488	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
489	if (!data)
490		return -ENOMEM;
491
492	data->regmap = regmap;
493	dev_set_drvdata(dev, data);
494
495	ret = abeoz9_rtc_setup(dev, client->dev.of_node);
496	if (ret)
497		return ret;
498
499	data->rtc = devm_rtc_allocate_device(dev);
500	ret = PTR_ERR_OR_ZERO(data->rtc);
501	if (ret)
502		return ret;
503
504	data->rtc->ops = &rtc_ops;
505	data->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
506	data->rtc->range_max = RTC_TIMESTAMP_END_2099;
507	clear_bit(RTC_FEATURE_ALARM, data->rtc->features);
508
509	if (client->irq > 0) {
510		unsigned long irqflags = IRQF_TRIGGER_LOW;
511
512		if (dev_fwnode(&client->dev))
513			irqflags = 0;
514
515		ret = devm_request_threaded_irq(dev, client->irq, NULL,
516						abeoz9_rtc_irq,
517						irqflags | IRQF_ONESHOT,
518						dev_name(dev), dev);
519		if (ret) {
520			dev_err(dev, "failed to request alarm irq\n");
521			return ret;
522		}
523	} else {
524		clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, data->rtc->features);
525	}
526
527	if (client->irq > 0 || device_property_read_bool(dev, "wakeup-source")) {
528		ret = device_init_wakeup(dev, true);
529		set_bit(RTC_FEATURE_ALARM, data->rtc->features);
530	}
531
532	ret = devm_rtc_register_device(data->rtc);
533	if (ret)
534		return ret;
535
536	abeoz9_hwmon_register(dev, data);
537	return 0;
538}
539
540#ifdef CONFIG_OF
541static const struct of_device_id abeoz9_dt_match[] = {
542	{ .compatible = "abracon,abeoz9" },
543	{ },
544};
545MODULE_DEVICE_TABLE(of, abeoz9_dt_match);
546#endif
547
548static const struct i2c_device_id abeoz9_id[] = {
549	{ "abeoz9" },
550	{ }
551};
552
553static struct i2c_driver abeoz9_driver = {
554	.driver = {
555		.name = "rtc-ab-eoz9",
556		.of_match_table = of_match_ptr(abeoz9_dt_match),
557	},
558	.probe = abeoz9_probe,
559	.id_table = abeoz9_id,
560};
561
562module_i2c_driver(abeoz9_driver);
563
564MODULE_AUTHOR("Artem Panfilov <panfilov.artyom@gmail.com>");
565MODULE_DESCRIPTION("Abracon AB-RTCMC-32.768kHz-EOZ9 RTC driver");
566MODULE_LICENSE("GPL");