[mirror_ubuntu-jammy-kernel.git] / drivers / rtc / rtc-pcf85363.c

/*
 * drivers/rtc/rtc-pcf85363.c
 *
 * Driver for NXP PCF85363 real-time clock.
 *
 * Copyright (C) 2017 Eric Nelson
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Based loosely on rtc-8583 by Russell King, Wolfram Sang and Juergen Beisert
 */
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/rtc.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/bcd.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regmap.h>

/*
 * Date/Time registers
 */
#define DT_100THS	0x00
#define DT_SECS		0x01
#define DT_MINUTES	0x02
#define DT_HOURS	0x03
#define DT_DAYS		0x04
#define DT_WEEKDAYS	0x05
#define DT_MONTHS	0x06
#define DT_YEARS	0x07

/*
 * Alarm registers
 */
#define DT_SECOND_ALM1	0x08
#define DT_MINUTE_ALM1	0x09
#define DT_HOUR_ALM1	0x0a
#define DT_DAY_ALM1	0x0b
#define DT_MONTH_ALM1	0x0c
#define DT_MINUTE_ALM2	0x0d
#define DT_HOUR_ALM2	0x0e
#define DT_WEEKDAY_ALM2	0x0f
#define DT_ALARM_EN	0x10

/*
 * Time stamp registers
 */
#define DT_TIMESTAMP1	0x11
#define DT_TIMESTAMP2	0x17
#define DT_TIMESTAMP3	0x1d
#define DT_TS_MODE	0x23

/*
 * control registers
 */
#define CTRL_OFFSET	0x24
#define CTRL_OSCILLATOR	0x25
#define CTRL_BATTERY	0x26
#define CTRL_PIN_IO	0x27
#define CTRL_FUNCTION	0x28
#define CTRL_INTA_EN	0x29
#define CTRL_INTB_EN	0x2a
#define CTRL_FLAGS	0x2b
#define CTRL_RAMBYTE	0x2c
#define CTRL_WDOG	0x2d
#define CTRL_STOP_EN	0x2e
#define CTRL_RESETS	0x2f
#define CTRL_RAM	0x40

#define ALRM_SEC_A1E	BIT(0)
#define ALRM_MIN_A1E	BIT(1)
#define ALRM_HR_A1E	BIT(2)
#define ALRM_DAY_A1E	BIT(3)
#define ALRM_MON_A1E	BIT(4)
#define ALRM_MIN_A2E	BIT(5)
#define ALRM_HR_A2E	BIT(6)
#define ALRM_DAY_A2E	BIT(7)

#define INT_WDIE	BIT(0)
#define INT_BSIE	BIT(1)
#define INT_TSRIE	BIT(2)
#define INT_A2IE	BIT(3)
#define INT_A1IE	BIT(4)
#define INT_OIE		BIT(5)
#define INT_PIE		BIT(6)
#define INT_ILP		BIT(7)

#define FLAGS_TSR1F	BIT(0)
#define FLAGS_TSR2F	BIT(1)
#define FLAGS_TSR3F	BIT(2)
#define FLAGS_BSF	BIT(3)
#define FLAGS_WDF	BIT(4)
#define FLAGS_A1F	BIT(5)
#define FLAGS_A2F	BIT(6)
#define FLAGS_PIF	BIT(7)

#define PIN_IO_INTAPM	GENMASK(1, 0)
#define PIN_IO_INTA_CLK	0
#define PIN_IO_INTA_BAT	1
#define PIN_IO_INTA_OUT	2
#define PIN_IO_INTA_HIZ	3

#define STOP_EN_STOP	BIT(0)

#define RESET_CPR	0xa4

#define NVRAM_SIZE	0x40

static struct i2c_driver pcf85363_driver;

struct pcf85363 {
	struct device		*dev;
	struct rtc_device	*rtc;
	struct regmap		*regmap;
};

static int pcf85363_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
	unsigned char buf[DT_YEARS + 1];
	int ret, len = sizeof(buf);

	/* read the RTC date and time registers all at once */
	ret = regmap_bulk_read(pcf85363->regmap, DT_100THS, buf, len);
	if (ret) {
		dev_err(dev, "%s: error %d\n", __func__, ret);
		return ret;
	}

	tm->tm_year = bcd2bin(buf[DT_YEARS]);
	/* adjust for 1900 base of rtc_time */
	tm->tm_year += 100;

	tm->tm_wday = buf[DT_WEEKDAYS] & 7;
	buf[DT_SECS] &= 0x7F;
	tm->tm_sec = bcd2bin(buf[DT_SECS]);
	buf[DT_MINUTES] &= 0x7F;
	tm->tm_min = bcd2bin(buf[DT_MINUTES]);
	tm->tm_hour = bcd2bin(buf[DT_HOURS]);
	tm->tm_mday = bcd2bin(buf[DT_DAYS]);
	tm->tm_mon = bcd2bin(buf[DT_MONTHS]) - 1;

	return 0;
}

static int pcf85363_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
	unsigned char tmp[11];
	unsigned char *buf = &tmp[2];
	int ret;

	tmp[0] = STOP_EN_STOP;
	tmp[1] = RESET_CPR;

	buf[DT_100THS] = 0;
	buf[DT_SECS] = bin2bcd(tm->tm_sec);
	buf[DT_MINUTES] = bin2bcd(tm->tm_min);
	buf[DT_HOURS] = bin2bcd(tm->tm_hour);
	buf[DT_DAYS] = bin2bcd(tm->tm_mday);
	buf[DT_WEEKDAYS] = tm->tm_wday;
	buf[DT_MONTHS] = bin2bcd(tm->tm_mon + 1);
	buf[DT_YEARS] = bin2bcd(tm->tm_year % 100);

	ret = regmap_bulk_write(pcf85363->regmap, CTRL_STOP_EN,
				tmp, sizeof(tmp));
	if (ret)
		return ret;

	return regmap_write(pcf85363->regmap, CTRL_STOP_EN, 0);
}

static int pcf85363_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
	unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
	unsigned int val;
	int ret;

	ret = regmap_bulk_read(pcf85363->regmap, DT_SECOND_ALM1, buf,
			       sizeof(buf));
	if (ret)
		return ret;

	alrm->time.tm_sec = bcd2bin(buf[0]);
	alrm->time.tm_min = bcd2bin(buf[1]);
	alrm->time.tm_hour = bcd2bin(buf[2]);
	alrm->time.tm_mday = bcd2bin(buf[3]);
	alrm->time.tm_mon = bcd2bin(buf[4]) - 1;

	ret = regmap_read(pcf85363->regmap, CTRL_INTA_EN, &val);
	if (ret)
		return ret;

	alrm->enabled =  !!(val & INT_A1IE);

	return 0;
}

static int _pcf85363_rtc_alarm_irq_enable(struct pcf85363 *pcf85363, unsigned
					  int enabled)
{
	unsigned int alarm_flags = ALRM_SEC_A1E | ALRM_MIN_A1E | ALRM_HR_A1E |
				   ALRM_DAY_A1E | ALRM_MON_A1E;
	int ret;

	ret = regmap_update_bits(pcf85363->regmap, DT_ALARM_EN, alarm_flags,
				 enabled ? alarm_flags : 0);
	if (ret)
		return ret;

	ret = regmap_update_bits(pcf85363->regmap, CTRL_INTA_EN,
				 INT_A1IE, enabled ? INT_A1IE : 0);

	if (ret || enabled)
		return ret;

	/* clear current flags */
	return regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
}

static int pcf85363_rtc_alarm_irq_enable(struct device *dev,
					 unsigned int enabled)
{
	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);

	return _pcf85363_rtc_alarm_irq_enable(pcf85363, enabled);
}

static int pcf85363_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
	unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
	int ret;

	buf[0] = bin2bcd(alrm->time.tm_sec);
	buf[1] = bin2bcd(alrm->time.tm_min);
	buf[2] = bin2bcd(alrm->time.tm_hour);
	buf[3] = bin2bcd(alrm->time.tm_mday);
	buf[4] = bin2bcd(alrm->time.tm_mon + 1);

	/*
	 * Disable the alarm interrupt before changing the value to avoid
	 * spurious interrupts
	 */
	ret = _pcf85363_rtc_alarm_irq_enable(pcf85363, 0);
	if (ret)
		return ret;

	ret = regmap_bulk_write(pcf85363->regmap, DT_SECOND_ALM1, buf,
				sizeof(buf));
	if (ret)
		return ret;

	return _pcf85363_rtc_alarm_irq_enable(pcf85363, alrm->enabled);
}

static irqreturn_t pcf85363_rtc_handle_irq(int irq, void *dev_id)
{
	struct pcf85363 *pcf85363 = i2c_get_clientdata(dev_id);
	unsigned int flags;
	int err;

	err = regmap_read(pcf85363->regmap, CTRL_FLAGS, &flags);
	if (err)
		return IRQ_NONE;

	if (flags & FLAGS_A1F) {
		rtc_update_irq(pcf85363->rtc, 1, RTC_IRQF | RTC_AF);
		regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
		return IRQ_HANDLED;
	}

	return IRQ_NONE;
}

static const struct rtc_class_ops rtc_ops = {
	.read_time	= pcf85363_rtc_read_time,
	.set_time	= pcf85363_rtc_set_time,
};

static const struct rtc_class_ops rtc_ops_alarm = {
	.read_time	= pcf85363_rtc_read_time,
	.set_time	= pcf85363_rtc_set_time,
	.read_alarm	= pcf85363_rtc_read_alarm,
	.set_alarm	= pcf85363_rtc_set_alarm,
	.alarm_irq_enable = pcf85363_rtc_alarm_irq_enable,
};

static int pcf85363_nvram_read(void *priv, unsigned int offset, void *val,
			       size_t bytes)
{
	struct pcf85363 *pcf85363 = priv;

	return regmap_bulk_read(pcf85363->regmap, CTRL_RAM + offset,
				val, bytes);
}

static int pcf85363_nvram_write(void *priv, unsigned int offset, void *val,
				size_t bytes)
{
	struct pcf85363 *pcf85363 = priv;

	return regmap_bulk_write(pcf85363->regmap, CTRL_RAM + offset,
				 val, bytes);
}

static const struct regmap_config regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0x7f,
};

static int pcf85363_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct pcf85363 *pcf85363;
	struct nvmem_config nvmem_cfg = {
		.name = "pcf85363-",
		.word_size = 1,
		.stride = 1,
		.size = NVRAM_SIZE,
		.reg_read = pcf85363_nvram_read,
		.reg_write = pcf85363_nvram_write,
	};
	int ret;

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

	pcf85363 = devm_kzalloc(&client->dev, sizeof(struct pcf85363),
				GFP_KERNEL);
	if (!pcf85363)
		return -ENOMEM;

	pcf85363->regmap = devm_regmap_init_i2c(client, &regmap_config);
	if (IS_ERR(pcf85363->regmap)) {
		dev_err(&client->dev, "regmap allocation failed\n");
		return PTR_ERR(pcf85363->regmap);
	}

	pcf85363->dev = &client->dev;
	i2c_set_clientdata(client, pcf85363);

	pcf85363->rtc = devm_rtc_allocate_device(pcf85363->dev);
	if (IS_ERR(pcf85363->rtc))
		return PTR_ERR(pcf85363->rtc);

	pcf85363->rtc->ops = &rtc_ops;

	if (client->irq > 0) {
		regmap_write(pcf85363->regmap, CTRL_FLAGS, 0);
		regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO,
				   PIN_IO_INTA_OUT, PIN_IO_INTAPM);
		ret = devm_request_threaded_irq(pcf85363->dev, client->irq,
						NULL, pcf85363_rtc_handle_irq,
						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
						"pcf85363", client);
		if (ret)
			dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
		else
			pcf85363->rtc->ops = &rtc_ops_alarm;
	}

	ret = rtc_register_device(pcf85363->rtc);

	nvmem_cfg.priv = pcf85363;
	rtc_nvmem_register(pcf85363->rtc, &nvmem_cfg);

	return ret;
}

static const struct of_device_id dev_ids[] = {
	{ .compatible = "nxp,pcf85363" },
	{}
};
MODULE_DEVICE_TABLE(of, dev_ids);

static struct i2c_driver pcf85363_driver = {
	.driver	= {
		.name	= "pcf85363",
		.of_match_table = of_match_ptr(dev_ids),
	},
	.probe	= pcf85363_probe,
};

module_i2c_driver(pcf85363_driver);

MODULE_AUTHOR("Eric Nelson");
MODULE_DESCRIPTION("pcf85363 I2C RTC driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
a9687aa2 EN	1	/*
	2	* drivers/rtc/rtc-pcf85363.c
	3	*
	4	* Driver for NXP PCF85363 real-time clock.
	5	*
	6	* Copyright (C) 2017 Eric Nelson
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	* Based loosely on rtc-8583 by Russell King, Wolfram Sang and Juergen Beisert
	13	*/
	14	#include <linux/module.h>
	15	#include <linux/i2c.h>
	16	#include <linux/slab.h>
	17	#include <linux/rtc.h>
	18	#include <linux/init.h>
	19	#include <linux/err.h>
	20	#include <linux/errno.h>
	21	#include <linux/bcd.h>
	22	#include <linux/of.h>
	23	#include <linux/of_device.h>
	24	#include <linux/regmap.h>
	25
	26	/*
	27	* Date/Time registers
	28	*/
	29	#define DT_100THS 0x00
	30	#define DT_SECS 0x01
	31	#define DT_MINUTES 0x02
	32	#define DT_HOURS 0x03
	33	#define DT_DAYS 0x04
	34	#define DT_WEEKDAYS 0x05
	35	#define DT_MONTHS 0x06
	36	#define DT_YEARS 0x07
	37
	38	/*
	39	* Alarm registers
	40	*/
	41	#define DT_SECOND_ALM1 0x08
	42	#define DT_MINUTE_ALM1 0x09
	43	#define DT_HOUR_ALM1 0x0a
	44	#define DT_DAY_ALM1 0x0b
	45	#define DT_MONTH_ALM1 0x0c
	46	#define DT_MINUTE_ALM2 0x0d
	47	#define DT_HOUR_ALM2 0x0e
	48	#define DT_WEEKDAY_ALM2 0x0f
	49	#define DT_ALARM_EN 0x10
	50
	51	/*
	52	* Time stamp registers
	53	*/
	54	#define DT_TIMESTAMP1 0x11
	55	#define DT_TIMESTAMP2 0x17
	56	#define DT_TIMESTAMP3 0x1d
	57	#define DT_TS_MODE 0x23
	58
	59	/*
	60	* control registers
	61	*/
	62	#define CTRL_OFFSET 0x24
	63	#define CTRL_OSCILLATOR 0x25
	64	#define CTRL_BATTERY 0x26
65	#define CTRL_PIN_IO 0x27
66	#define CTRL_FUNCTION 0x28
67	#define CTRL_INTA_EN 0x29
68	#define CTRL_INTB_EN 0x2a
69	#define CTRL_FLAGS 0x2b
70	#define CTRL_RAMBYTE 0x2c
71	#define CTRL_WDOG 0x2d
72	#define CTRL_STOP_EN 0x2e
73	#define CTRL_RESETS 0x2f
74	#define CTRL_RAM 0x40
75
e5aac267 AB	76	#define ALRM_SEC_A1E BIT(0)
	77	#define ALRM_MIN_A1E BIT(1)
	78	#define ALRM_HR_A1E BIT(2)
	79	#define ALRM_DAY_A1E BIT(3)
	80	#define ALRM_MON_A1E BIT(4)
	81	#define ALRM_MIN_A2E BIT(5)
	82	#define ALRM_HR_A2E BIT(6)
	83	#define ALRM_DAY_A2E BIT(7)
	84
	85	#define INT_WDIE BIT(0)
	86	#define INT_BSIE BIT(1)
	87	#define INT_TSRIE BIT(2)
	88	#define INT_A2IE BIT(3)
	89	#define INT_A1IE BIT(4)
	90	#define INT_OIE BIT(5)
	91	#define INT_PIE BIT(6)
	92	#define INT_ILP BIT(7)
	93
	94	#define FLAGS_TSR1F BIT(0)
	95	#define FLAGS_TSR2F BIT(1)
	96	#define FLAGS_TSR3F BIT(2)
	97	#define FLAGS_BSF BIT(3)
	98	#define FLAGS_WDF BIT(4)
	99	#define FLAGS_A1F BIT(5)
	100	#define FLAGS_A2F BIT(6)
	101	#define FLAGS_PIF BIT(7)
	102
	103	#define PIN_IO_INTAPM GENMASK(1, 0)
	104	#define PIN_IO_INTA_CLK 0
	105	#define PIN_IO_INTA_BAT 1
	106	#define PIN_IO_INTA_OUT 2
	107	#define PIN_IO_INTA_HIZ 3
	108
188306ac AB	109	#define STOP_EN_STOP BIT(0)
	110
	111	#define RESET_CPR 0xa4
	112
a9687aa2 EN	113	#define NVRAM_SIZE 0x40
	114
	115	static struct i2c_driver pcf85363_driver;
	116
	117	struct pcf85363 {
	118	struct device *dev;
	119	struct rtc_device *rtc;
a9687aa2 EN	120	struct regmap *regmap;
	121	};
	122
	123	static int pcf85363_rtc_read_time(struct device dev, struct rtc_time tm)
	124	{
	125	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
	126	unsigned char buf[DT_YEARS + 1];
	127	int ret, len = sizeof(buf);
	128
	129	/* read the RTC date and time registers all at once */
	130	ret = regmap_bulk_read(pcf85363->regmap, DT_100THS, buf, len);
	131	if (ret) {
	132	dev_err(dev, "%s: error %d\n", __func__, ret);
	133	return ret;
	134	}
	135
	136	tm->tm_year = bcd2bin(buf[DT_YEARS]);
	137	/* adjust for 1900 base of rtc_time */
	138	tm->tm_year += 100;
	139
	140	tm->tm_wday = buf[DT_WEEKDAYS] & 7;
	141	buf[DT_SECS] &= 0x7F;
	142	tm->tm_sec = bcd2bin(buf[DT_SECS]);
	143	buf[DT_MINUTES] &= 0x7F;
	144	tm->tm_min = bcd2bin(buf[DT_MINUTES]);
	145	tm->tm_hour = bcd2bin(buf[DT_HOURS]);
	146	tm->tm_mday = bcd2bin(buf[DT_DAYS]);
	147	tm->tm_mon = bcd2bin(buf[DT_MONTHS]) - 1;
	148
	149	return 0;
	150	}
	151
	152	static int pcf85363_rtc_set_time(struct device dev, struct rtc_time tm)
	153	{
	154	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
188306ac AB	155	unsigned char tmp[11];
	156	unsigned char *buf = &tmp[2];
	157	int ret;
	158
	159	tmp[0] = STOP_EN_STOP;
	160	tmp[1] = RESET_CPR;
a9687aa2 EN	161
	162	buf[DT_100THS] = 0;
	163	buf[DT_SECS] = bin2bcd(tm->tm_sec);
	164	buf[DT_MINUTES] = bin2bcd(tm->tm_min);
	165	buf[DT_HOURS] = bin2bcd(tm->tm_hour);
	166	buf[DT_DAYS] = bin2bcd(tm->tm_mday);
	167	buf[DT_WEEKDAYS] = tm->tm_wday;
	168	buf[DT_MONTHS] = bin2bcd(tm->tm_mon + 1);
	169	buf[DT_YEARS] = bin2bcd(tm->tm_year % 100);
	170
188306ac AB	171	ret = regmap_bulk_write(pcf85363->regmap, CTRL_STOP_EN,
	172	tmp, sizeof(tmp));
	173	if (ret)
	174	return ret;
	175
	176	return regmap_write(pcf85363->regmap, CTRL_STOP_EN, 0);
a9687aa2 EN	177	}
a9687aa2 EN	178
e5aac267 AB	179	static int pcf85363_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	180	{
	181	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
	182	unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
	183	unsigned int val;
	184	int ret;
	185
	186	ret = regmap_bulk_read(pcf85363->regmap, DT_SECOND_ALM1, buf,
	187	sizeof(buf));
	188	if (ret)
	189	return ret;
	190
	191	alrm->time.tm_sec = bcd2bin(buf[0]);
	192	alrm->time.tm_min = bcd2bin(buf[1]);
	193	alrm->time.tm_hour = bcd2bin(buf[2]);
	194	alrm->time.tm_mday = bcd2bin(buf[3]);
	195	alrm->time.tm_mon = bcd2bin(buf[4]) - 1;
	196
	197	ret = regmap_read(pcf85363->regmap, CTRL_INTA_EN, &val);
	198	if (ret)
	199	return ret;
	200
	201	alrm->enabled = !!(val & INT_A1IE);
	202
	203	return 0;
	204	}
	205
	206	static int _pcf85363_rtc_alarm_irq_enable(struct pcf85363 *pcf85363, unsigned
	207	int enabled)
	208	{
	209	unsigned int alarm_flags = ALRM_SEC_A1E \| ALRM_MIN_A1E \| ALRM_HR_A1E \|
	210	ALRM_DAY_A1E \| ALRM_MON_A1E;
	211	int ret;
	212
	213	ret = regmap_update_bits(pcf85363->regmap, DT_ALARM_EN, alarm_flags,
	214	enabled ? alarm_flags : 0);
	215	if (ret)
	216	return ret;
	217
	218	ret = regmap_update_bits(pcf85363->regmap, CTRL_INTA_EN,
	219	INT_A1IE, enabled ? INT_A1IE : 0);
	220
	221	if (ret \|\| enabled)
	222	return ret;
	223
	224	/* clear current flags */
	225	return regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
	226	}
	227
	228	static int pcf85363_rtc_alarm_irq_enable(struct device *dev,
	229	unsigned int enabled)
	230	{
	231	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
	232
	233	return _pcf85363_rtc_alarm_irq_enable(pcf85363, enabled);
	234	}
	235
	236	static int pcf85363_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	237	{
	238	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
	239	unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
	240	int ret;
	241
	242	buf[0] = bin2bcd(alrm->time.tm_sec);
243	buf[1] = bin2bcd(alrm->time.tm_min);
244	buf[2] = bin2bcd(alrm->time.tm_hour);
245	buf[3] = bin2bcd(alrm->time.tm_mday);
246	buf[4] = bin2bcd(alrm->time.tm_mon + 1);
247
248	/*
249	* Disable the alarm interrupt before changing the value to avoid
250	* spurious interrupts
251	*/
252	ret = _pcf85363_rtc_alarm_irq_enable(pcf85363, 0);
253	if (ret)
254	return ret;
255
256	ret = regmap_bulk_write(pcf85363->regmap, DT_SECOND_ALM1, buf,
257	sizeof(buf));
258	if (ret)
259	return ret;
260
261	return _pcf85363_rtc_alarm_irq_enable(pcf85363, alrm->enabled);
262	}
263
264	static irqreturn_t pcf85363_rtc_handle_irq(int irq, void *dev_id)
265	{
266	struct pcf85363 *pcf85363 = i2c_get_clientdata(dev_id);
267	unsigned int flags;
268	int err;
269
270	err = regmap_read(pcf85363->regmap, CTRL_FLAGS, &flags);
271	if (err)
272	return IRQ_NONE;
273
274	if (flags & FLAGS_A1F) {
275	rtc_update_irq(pcf85363->rtc, 1, RTC_IRQF \| RTC_AF);
276	regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
277	return IRQ_HANDLED;
278	}
279
280	return IRQ_NONE;
281	}
282
a9687aa2 EN	283	static const struct rtc_class_ops rtc_ops = {
	284	.read_time = pcf85363_rtc_read_time,
	285	.set_time = pcf85363_rtc_set_time,
	286	};
	287
e5aac267 AB	288	static const struct rtc_class_ops rtc_ops_alarm = {
	289	.read_time = pcf85363_rtc_read_time,
	290	.set_time = pcf85363_rtc_set_time,
	291	.read_alarm = pcf85363_rtc_read_alarm,
	292	.set_alarm = pcf85363_rtc_set_alarm,
	293	.alarm_irq_enable = pcf85363_rtc_alarm_irq_enable,
	294	};
	295
a9687aa2 EN	296	static int pcf85363_nvram_read(void priv, unsigned int offset, void val,
	297	size_t bytes)
	298	{
	299	struct pcf85363 *pcf85363 = priv;
	300
	301	return regmap_bulk_read(pcf85363->regmap, CTRL_RAM + offset,
	302	val, bytes);
	303	}
	304
	305	static int pcf85363_nvram_write(void priv, unsigned int offset, void val,
	306	size_t bytes)
	307	{
	308	struct pcf85363 *pcf85363 = priv;
	309
	310	return regmap_bulk_write(pcf85363->regmap, CTRL_RAM + offset,
	311	val, bytes);
	312	}
	313
	314	static const struct regmap_config regmap_config = {
	315	.reg_bits = 8,
	316	.val_bits = 8,
c57849dd	317	.max_register = 0x7f,
a9687aa2 EN	318	};
	319
	320	static int pcf85363_probe(struct i2c_client *client,
	321	const struct i2c_device_id *id)
	322	{
	323	struct pcf85363 *pcf85363;
0e7a412f AB	324	struct nvmem_config nvmem_cfg = {
	325	.name = "pcf85363-",
	326	.word_size = 1,
	327	.stride = 1,
	328	.size = NVRAM_SIZE,
	329	.reg_read = pcf85363_nvram_read,
	330	.reg_write = pcf85363_nvram_write,
	331	};
24849d17	332	int ret;
a9687aa2 EN	333
	334	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
	335	return -ENODEV;
	336
	337	pcf85363 = devm_kzalloc(&client->dev, sizeof(struct pcf85363),
	338	GFP_KERNEL);
	339	if (!pcf85363)
	340	return -ENOMEM;
	341
	342	pcf85363->regmap = devm_regmap_init_i2c(client, &regmap_config);
	343	if (IS_ERR(pcf85363->regmap)) {
	344	dev_err(&client->dev, "regmap allocation failed\n");
	345	return PTR_ERR(pcf85363->regmap);
	346	}
	347
	348	pcf85363->dev = &client->dev;
	349	i2c_set_clientdata(client, pcf85363);
	350
	351	pcf85363->rtc = devm_rtc_allocate_device(pcf85363->dev);
	352	if (IS_ERR(pcf85363->rtc))
	353	return PTR_ERR(pcf85363->rtc);
	354
a9687aa2 EN	355	pcf85363->rtc->ops = &rtc_ops;
a9687aa2 EN	356
e5aac267 AB	357	if (client->irq > 0) {
	358	regmap_write(pcf85363->regmap, CTRL_FLAGS, 0);
	359	regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO,
	360	PIN_IO_INTA_OUT, PIN_IO_INTAPM);
	361	ret = devm_request_threaded_irq(pcf85363->dev, client->irq,
	362	NULL, pcf85363_rtc_handle_irq,
	363	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	364	"pcf85363", client);
	365	if (ret)
	366	dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
	367	else
	368	pcf85363->rtc->ops = &rtc_ops_alarm;
	369	}
	370
24849d17 AB	371	ret = rtc_register_device(pcf85363->rtc);
24849d17 AB	372
0e7a412f AB	373	nvmem_cfg.priv = pcf85363;
0e7a412f AB	374	rtc_nvmem_register(pcf85363->rtc, &nvmem_cfg);
24849d17 AB	375
24849d17 AB	376	return ret;
a9687aa2 EN	377	}
	378
	379	static const struct of_device_id dev_ids[] = {
	380	{ .compatible = "nxp,pcf85363" },
	381	{}
	382	};
	383	MODULE_DEVICE_TABLE(of, dev_ids);
	384
	385	static struct i2c_driver pcf85363_driver = {
	386	.driver = {
	387	.name = "pcf85363",
	388	.of_match_table = of_match_ptr(dev_ids),
	389	},
	390	.probe = pcf85363_probe,
	391	};
	392
	393	module_i2c_driver(pcf85363_driver);
	394
	395	MODULE_AUTHOR("Eric Nelson");
	396	MODULE_DESCRIPTION("pcf85363 I2C RTC driver");
	397	MODULE_LICENSE("GPL");