[linux.git] / drivers / rtc / rtc-s35390a.c

/*
 * Seiko Instruments S-35390A RTC Driver
 *
 * Copyright (c) 2007 Byron Bradley
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/i2c.h>
#include <linux/bitrev.h>
#include <linux/bcd.h>
#include <linux/slab.h>

#define S35390A_CMD_STATUS1	0
#define S35390A_CMD_STATUS2	1
#define S35390A_CMD_TIME1	2
#define S35390A_CMD_TIME2	3
#define S35390A_CMD_INT2_REG1	5

#define S35390A_BYTE_YEAR	0
#define S35390A_BYTE_MONTH	1
#define S35390A_BYTE_DAY	2
#define S35390A_BYTE_WDAY	3
#define S35390A_BYTE_HOURS	4
#define S35390A_BYTE_MINS	5
#define S35390A_BYTE_SECS	6

#define S35390A_ALRM_BYTE_WDAY	0
#define S35390A_ALRM_BYTE_HOURS	1
#define S35390A_ALRM_BYTE_MINS	2

#define S35390A_FLAG_POC	0x01
#define S35390A_FLAG_BLD	0x02
#define S35390A_FLAG_24H	0x40
#define S35390A_FLAG_RESET	0x80
#define S35390A_FLAG_TEST	0x01

#define S35390A_INT2_MODE_MASK		0xF0

#define S35390A_INT2_MODE_NOINTR	0x00
#define S35390A_INT2_MODE_FREQ		0x10
#define S35390A_INT2_MODE_ALARM		0x40
#define S35390A_INT2_MODE_PMIN_EDG	0x20

static const struct i2c_device_id s35390a_id[] = {
	{ "s35390a", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, s35390a_id);

struct s35390a {
	struct i2c_client *client[8];
	struct rtc_device *rtc;
	int twentyfourhour;
};

static int s35390a_set_reg(struct s35390a *s35390a, int reg, char *buf, int len)
{
	struct i2c_client *client = s35390a->client[reg];
	struct i2c_msg msg[] = {
		{
			.addr = client->addr,
			.len = len,
			.buf = buf
		},
	};

	if ((i2c_transfer(client->adapter, msg, 1)) != 1)
		return -EIO;

	return 0;
}

static int s35390a_get_reg(struct s35390a *s35390a, int reg, char *buf, int len)
{
	struct i2c_client *client = s35390a->client[reg];
	struct i2c_msg msg[] = {
		{
			.addr = client->addr,
			.flags = I2C_M_RD,
			.len = len,
			.buf = buf
		},
	};

	if ((i2c_transfer(client->adapter, msg, 1)) != 1)
		return -EIO;

	return 0;
}

static int s35390a_reset(struct s35390a *s35390a)
{
	char buf[1];

	if (s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, buf, sizeof(buf)) < 0)
		return -EIO;

	if (!(buf[0] & (S35390A_FLAG_POC | S35390A_FLAG_BLD)))
		return 0;

	buf[0] |= (S35390A_FLAG_RESET | S35390A_FLAG_24H);
	buf[0] &= 0xf0;
	return s35390a_set_reg(s35390a, S35390A_CMD_STATUS1, buf, sizeof(buf));
}

static int s35390a_disable_test_mode(struct s35390a *s35390a)
{
	char buf[1];

	if (s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, buf, sizeof(buf)) < 0)
		return -EIO;

	if (!(buf[0] & S35390A_FLAG_TEST))
		return 0;

	buf[0] &= ~S35390A_FLAG_TEST;
	return s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, buf, sizeof(buf));
}

static char s35390a_hr2reg(struct s35390a *s35390a, int hour)
{
	if (s35390a->twentyfourhour)
		return bin2bcd(hour);

	if (hour < 12)
		return bin2bcd(hour);

	return 0x40 | bin2bcd(hour - 12);
}

static int s35390a_reg2hr(struct s35390a *s35390a, char reg)
{
	unsigned hour;

	if (s35390a->twentyfourhour)
		return bcd2bin(reg & 0x3f);

	hour = bcd2bin(reg & 0x3f);
	if (reg & 0x40)
		hour += 12;

	return hour;
}

static int s35390a_set_datetime(struct i2c_client *client, struct rtc_time *tm)
{
	struct s35390a	*s35390a = i2c_get_clientdata(client);
	int i, err;
	char buf[7];

	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d mday=%d, "
		"mon=%d, year=%d, wday=%d\n", __func__, tm->tm_sec,
		tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year,
		tm->tm_wday);

	buf[S35390A_BYTE_YEAR] = bin2bcd(tm->tm_year - 100);
	buf[S35390A_BYTE_MONTH] = bin2bcd(tm->tm_mon + 1);
	buf[S35390A_BYTE_DAY] = bin2bcd(tm->tm_mday);
	buf[S35390A_BYTE_WDAY] = bin2bcd(tm->tm_wday);
	buf[S35390A_BYTE_HOURS] = s35390a_hr2reg(s35390a, tm->tm_hour);
	buf[S35390A_BYTE_MINS] = bin2bcd(tm->tm_min);
	buf[S35390A_BYTE_SECS] = bin2bcd(tm->tm_sec);

	/* This chip expects the bits of each byte to be in reverse order */
	for (i = 0; i < 7; ++i)
		buf[i] = bitrev8(buf[i]);

	err = s35390a_set_reg(s35390a, S35390A_CMD_TIME1, buf, sizeof(buf));

	return err;
}

static int s35390a_get_datetime(struct i2c_client *client, struct rtc_time *tm)
{
	struct s35390a *s35390a = i2c_get_clientdata(client);
	char buf[7];
	int i, err;

	err = s35390a_get_reg(s35390a, S35390A_CMD_TIME1, buf, sizeof(buf));
	if (err < 0)
		return err;

	/* This chip returns the bits of each byte in reverse order */
	for (i = 0; i < 7; ++i)
		buf[i] = bitrev8(buf[i]);

	tm->tm_sec = bcd2bin(buf[S35390A_BYTE_SECS]);
	tm->tm_min = bcd2bin(buf[S35390A_BYTE_MINS]);
	tm->tm_hour = s35390a_reg2hr(s35390a, buf[S35390A_BYTE_HOURS]);
	tm->tm_wday = bcd2bin(buf[S35390A_BYTE_WDAY]);
	tm->tm_mday = bcd2bin(buf[S35390A_BYTE_DAY]);
	tm->tm_mon = bcd2bin(buf[S35390A_BYTE_MONTH]) - 1;
	tm->tm_year = bcd2bin(buf[S35390A_BYTE_YEAR]) + 100;

	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, mday=%d, "
		"mon=%d, year=%d, wday=%d\n", __func__, tm->tm_sec,
		tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year,
		tm->tm_wday);

	return rtc_valid_tm(tm);
}

static int s35390a_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alm)
{
	struct s35390a *s35390a = i2c_get_clientdata(client);
	char buf[3], sts = 0;
	int err, i;

	dev_dbg(&client->dev, "%s: alm is secs=%d, mins=%d, hours=%d mday=%d, "\
		"mon=%d, year=%d, wday=%d\n", __func__, alm->time.tm_sec,
		alm->time.tm_min, alm->time.tm_hour, alm->time.tm_mday,
		alm->time.tm_mon, alm->time.tm_year, alm->time.tm_wday);

	/* disable interrupt */
	err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
	if (err < 0)
		return err;

	/* clear pending interrupt, if any */
	err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, &sts, sizeof(sts));
	if (err < 0)
		return err;

	if (alm->enabled)
		sts = S35390A_INT2_MODE_ALARM;
	else
		sts = S35390A_INT2_MODE_NOINTR;

	/* This chip expects the bits of each byte to be in reverse order */
	sts = bitrev8(sts);

	/* set interupt mode*/
	err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
	if (err < 0)
		return err;

	if (alm->time.tm_wday != -1)
		buf[S35390A_ALRM_BYTE_WDAY] = bin2bcd(alm->time.tm_wday) | 0x80;

	buf[S35390A_ALRM_BYTE_HOURS] = s35390a_hr2reg(s35390a,
			alm->time.tm_hour) | 0x80;
	buf[S35390A_ALRM_BYTE_MINS] = bin2bcd(alm->time.tm_min) | 0x80;

	if (alm->time.tm_hour >= 12)
		buf[S35390A_ALRM_BYTE_HOURS] |= 0x40;

	for (i = 0; i < 3; ++i)
		buf[i] = bitrev8(buf[i]);

	err = s35390a_set_reg(s35390a, S35390A_CMD_INT2_REG1, buf,
								sizeof(buf));

	return err;
}

static int s35390a_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alm)
{
	struct s35390a *s35390a = i2c_get_clientdata(client);
	char buf[3], sts;
	int i, err;

	err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
	if (err < 0)
		return err;

	if (bitrev8(sts) != S35390A_INT2_MODE_ALARM)
		return -EINVAL;

	err = s35390a_get_reg(s35390a, S35390A_CMD_INT2_REG1, buf, sizeof(buf));
	if (err < 0)
		return err;

	/* This chip returns the bits of each byte in reverse order */
	for (i = 0; i < 3; ++i) {
		buf[i] = bitrev8(buf[i]);
		buf[i] &= ~0x80;
	}

	alm->time.tm_wday = bcd2bin(buf[S35390A_ALRM_BYTE_WDAY]);
	alm->time.tm_hour = s35390a_reg2hr(s35390a,
						buf[S35390A_ALRM_BYTE_HOURS]);
	alm->time.tm_min = bcd2bin(buf[S35390A_ALRM_BYTE_MINS]);

	dev_dbg(&client->dev, "%s: alm is mins=%d, hours=%d, wday=%d\n",
			__func__, alm->time.tm_min, alm->time.tm_hour,
			alm->time.tm_wday);

	return 0;
}

static int s35390a_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	return s35390a_read_alarm(to_i2c_client(dev), alm);
}

static int s35390a_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	return s35390a_set_alarm(to_i2c_client(dev), alm);
}

static int s35390a_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	return s35390a_get_datetime(to_i2c_client(dev), tm);
}

static int s35390a_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	return s35390a_set_datetime(to_i2c_client(dev), tm);
}

static const struct rtc_class_ops s35390a_rtc_ops = {
	.read_time	= s35390a_rtc_read_time,
	.set_time	= s35390a_rtc_set_time,
	.set_alarm	= s35390a_rtc_set_alarm,
	.read_alarm	= s35390a_rtc_read_alarm,

};

static struct i2c_driver s35390a_driver;

static int s35390a_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	int err;
	unsigned int i;
	struct s35390a *s35390a;
	struct rtc_time tm;
	char buf[1];

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		err = -ENODEV;
		goto exit;
	}

	s35390a = kzalloc(sizeof(struct s35390a), GFP_KERNEL);
	if (!s35390a) {
		err = -ENOMEM;
		goto exit;
	}

	s35390a->client[0] = client;
	i2c_set_clientdata(client, s35390a);

	/* This chip uses multiple addresses, use dummy devices for them */
	for (i = 1; i < 8; ++i) {
		s35390a->client[i] = i2c_new_dummy(client->adapter,
					client->addr + i);
		if (!s35390a->client[i]) {
			dev_err(&client->dev, "Address %02x unavailable\n",
						client->addr + i);
			err = -EBUSY;
			goto exit_dummy;
		}
	}

	err = s35390a_reset(s35390a);
	if (err < 0) {
		dev_err(&client->dev, "error resetting chip\n");
		goto exit_dummy;
	}

	err = s35390a_disable_test_mode(s35390a);
	if (err < 0) {
		dev_err(&client->dev, "error disabling test mode\n");
		goto exit_dummy;
	}

	err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, buf, sizeof(buf));
	if (err < 0) {
		dev_err(&client->dev, "error checking 12/24 hour mode\n");
		goto exit_dummy;
	}
	if (buf[0] & S35390A_FLAG_24H)
		s35390a->twentyfourhour = 1;
	else
		s35390a->twentyfourhour = 0;

	if (s35390a_get_datetime(client, &tm) < 0)
		dev_warn(&client->dev, "clock needs to be set\n");

	device_set_wakeup_capable(&client->dev, 1);

	s35390a->rtc = rtc_device_register(s35390a_driver.driver.name,
				&client->dev, &s35390a_rtc_ops, THIS_MODULE);

	if (IS_ERR(s35390a->rtc)) {
		err = PTR_ERR(s35390a->rtc);
		goto exit_dummy;
	}
	return 0;

exit_dummy:
	for (i = 1; i < 8; ++i)
		if (s35390a->client[i])
			i2c_unregister_device(s35390a->client[i]);
	kfree(s35390a);

exit:
	return err;
}

static int s35390a_remove(struct i2c_client *client)
{
	unsigned int i;

	struct s35390a *s35390a = i2c_get_clientdata(client);
	for (i = 1; i < 8; ++i)
		if (s35390a->client[i])
			i2c_unregister_device(s35390a->client[i]);

	rtc_device_unregister(s35390a->rtc);
	kfree(s35390a);

	return 0;
}

static struct i2c_driver s35390a_driver = {
	.driver		= {
		.name	= "rtc-s35390a",
	},
	.probe		= s35390a_probe,
	.remove		= s35390a_remove,
	.id_table	= s35390a_id,
};

module_i2c_driver(s35390a_driver);

MODULE_AUTHOR("Byron Bradley <[email protected]>");
MODULE_DESCRIPTION("S35390A RTC driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
c46288b0 BB	1	/*
	2	* Seiko Instruments S-35390A RTC Driver
	3	*
	4	* Copyright (c) 2007 Byron Bradley
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/rtc.h>
	14	#include <linux/i2c.h>
	15	#include <linux/bitrev.h>
	16	#include <linux/bcd.h>
	17	#include <linux/slab.h>
	18
	19	#define S35390A_CMD_STATUS1 0
	20	#define S35390A_CMD_STATUS2 1
	21	#define S35390A_CMD_TIME1 2
542dd33a ML	22	#define S35390A_CMD_TIME2 3
542dd33a ML	23	#define S35390A_CMD_INT2_REG1 5
c46288b0 BB	24
	25	#define S35390A_BYTE_YEAR 0
	26	#define S35390A_BYTE_MONTH 1
	27	#define S35390A_BYTE_DAY 2
	28	#define S35390A_BYTE_WDAY 3
	29	#define S35390A_BYTE_HOURS 4
	30	#define S35390A_BYTE_MINS 5
	31	#define S35390A_BYTE_SECS 6
	32
542dd33a ML	33	#define S35390A_ALRM_BYTE_WDAY 0
	34	#define S35390A_ALRM_BYTE_HOURS 1
	35	#define S35390A_ALRM_BYTE_MINS 2
	36
c46288b0 BB	37	#define S35390A_FLAG_POC 0x01
	38	#define S35390A_FLAG_BLD 0x02
	39	#define S35390A_FLAG_24H 0x40
	40	#define S35390A_FLAG_RESET 0x80
	41	#define S35390A_FLAG_TEST 0x01
	42
542dd33a ML	43	#define S35390A_INT2_MODE_MASK 0xF0
	44
	45	#define S35390A_INT2_MODE_NOINTR 0x00
	46	#define S35390A_INT2_MODE_FREQ 0x10
	47	#define S35390A_INT2_MODE_ALARM 0x40
	48	#define S35390A_INT2_MODE_PMIN_EDG 0x20
	49
3760f736 JD	50	static const struct i2c_device_id s35390a_id[] = {
	51	{ "s35390a", 0 },
	52	{ }
	53	};
	54	MODULE_DEVICE_TABLE(i2c, s35390a_id);
	55
c46288b0 BB	56	struct s35390a {
	57	struct i2c_client *client[8];
	58	struct rtc_device *rtc;
	59	int twentyfourhour;
	60	};
	61
	62	static int s35390a_set_reg(struct s35390a s35390a, int reg, char buf, int len)
	63	{
	64	struct i2c_client *client = s35390a->client[reg];
	65	struct i2c_msg msg[] = {
65659f63 S	66	{
	67	.addr = client->addr,
	68	.len = len,
	69	.buf = buf
	70	},
c46288b0 BB	71	};
	72
	73	if ((i2c_transfer(client->adapter, msg, 1)) != 1)
	74	return -EIO;
	75
	76	return 0;
	77	}
	78
	79	static int s35390a_get_reg(struct s35390a s35390a, int reg, char buf, int len)
	80	{
	81	struct i2c_client *client = s35390a->client[reg];
	82	struct i2c_msg msg[] = {
65659f63 S	83	{
	84	.addr = client->addr,
	85	.flags = I2C_M_RD,
	86	.len = len,
	87	.buf = buf
	88	},
c46288b0 BB	89	};
	90
	91	if ((i2c_transfer(client->adapter, msg, 1)) != 1)
	92	return -EIO;
	93
	94	return 0;
	95	}
	96
	97	static int s35390a_reset(struct s35390a *s35390a)
	98	{
	99	char buf[1];
	100
	101	if (s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, buf, sizeof(buf)) < 0)
	102	return -EIO;
	103
	104	if (!(buf[0] & (S35390A_FLAG_POC \| S35390A_FLAG_BLD)))
	105	return 0;
	106
	107	buf[0] \|= (S35390A_FLAG_RESET \| S35390A_FLAG_24H);
	108	buf[0] &= 0xf0;
	109	return s35390a_set_reg(s35390a, S35390A_CMD_STATUS1, buf, sizeof(buf));
	110	}
	111
	112	static int s35390a_disable_test_mode(struct s35390a *s35390a)
	113	{
	114	char buf[1];
	115
	116	if (s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, buf, sizeof(buf)) < 0)
	117	return -EIO;
	118
	119	if (!(buf[0] & S35390A_FLAG_TEST))
	120	return 0;
	121
	122	buf[0] &= ~S35390A_FLAG_TEST;
	123	return s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, buf, sizeof(buf));
	124	}
	125
	126	static char s35390a_hr2reg(struct s35390a *s35390a, int hour)
	127	{
	128	if (s35390a->twentyfourhour)
fe20ba70	129	return bin2bcd(hour);
c46288b0 BB	130
c46288b0 BB	131	if (hour < 12)
fe20ba70	132	return bin2bcd(hour);
c46288b0	133
fe20ba70	134	return 0x40 \| bin2bcd(hour - 12);
c46288b0 BB	135	}
	136
	137	static int s35390a_reg2hr(struct s35390a *s35390a, char reg)
	138	{
	139	unsigned hour;
	140
	141	if (s35390a->twentyfourhour)
fe20ba70	142	return bcd2bin(reg & 0x3f);
c46288b0	143
fe20ba70	144	hour = bcd2bin(reg & 0x3f);
c46288b0 BB	145	if (reg & 0x40)
	146	hour += 12;
	147
	148	return hour;
	149	}
	150
	151	static int s35390a_set_datetime(struct i2c_client client, struct rtc_time tm)
	152	{
	153	struct s35390a *s35390a = i2c_get_clientdata(client);
	154	int i, err;
	155	char buf[7];
	156
	157	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d mday=%d, "
	158	"mon=%d, year=%d, wday=%d\n", __func__, tm->tm_sec,
	159	tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year,
	160	tm->tm_wday);
	161
fe20ba70 AB	162	buf[S35390A_BYTE_YEAR] = bin2bcd(tm->tm_year - 100);
	163	buf[S35390A_BYTE_MONTH] = bin2bcd(tm->tm_mon + 1);
	164	buf[S35390A_BYTE_DAY] = bin2bcd(tm->tm_mday);
	165	buf[S35390A_BYTE_WDAY] = bin2bcd(tm->tm_wday);
c46288b0	166	buf[S35390A_BYTE_HOURS] = s35390a_hr2reg(s35390a, tm->tm_hour);
fe20ba70 AB	167	buf[S35390A_BYTE_MINS] = bin2bcd(tm->tm_min);
fe20ba70 AB	168	buf[S35390A_BYTE_SECS] = bin2bcd(tm->tm_sec);
c46288b0 BB	169
	170	/* This chip expects the bits of each byte to be in reverse order */
	171	for (i = 0; i < 7; ++i)
	172	buf[i] = bitrev8(buf[i]);
	173
	174	err = s35390a_set_reg(s35390a, S35390A_CMD_TIME1, buf, sizeof(buf));
	175
	176	return err;
	177	}
	178
	179	static int s35390a_get_datetime(struct i2c_client client, struct rtc_time tm)
	180	{
	181	struct s35390a *s35390a = i2c_get_clientdata(client);
	182	char buf[7];
	183	int i, err;
	184
	185	err = s35390a_get_reg(s35390a, S35390A_CMD_TIME1, buf, sizeof(buf));
	186	if (err < 0)
	187	return err;
	188
	189	/* This chip returns the bits of each byte in reverse order */
	190	for (i = 0; i < 7; ++i)
	191	buf[i] = bitrev8(buf[i]);
	192
fe20ba70 AB	193	tm->tm_sec = bcd2bin(buf[S35390A_BYTE_SECS]);
fe20ba70 AB	194	tm->tm_min = bcd2bin(buf[S35390A_BYTE_MINS]);
c46288b0	195	tm->tm_hour = s35390a_reg2hr(s35390a, buf[S35390A_BYTE_HOURS]);
fe20ba70 AB	196	tm->tm_wday = bcd2bin(buf[S35390A_BYTE_WDAY]);
	197	tm->tm_mday = bcd2bin(buf[S35390A_BYTE_DAY]);
	198	tm->tm_mon = bcd2bin(buf[S35390A_BYTE_MONTH]) - 1;
	199	tm->tm_year = bcd2bin(buf[S35390A_BYTE_YEAR]) + 100;
c46288b0 BB	200
	201	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, mday=%d, "
	202	"mon=%d, year=%d, wday=%d\n", __func__, tm->tm_sec,
	203	tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year,
	204	tm->tm_wday);
	205
	206	return rtc_valid_tm(tm);
	207	}
	208
542dd33a ML	209	static int s35390a_set_alarm(struct i2c_client client, struct rtc_wkalrm alm)
	210	{
	211	struct s35390a *s35390a = i2c_get_clientdata(client);
	212	char buf[3], sts = 0;
	213	int err, i;
	214
	215	dev_dbg(&client->dev, "%s: alm is secs=%d, mins=%d, hours=%d mday=%d, "\
	216	"mon=%d, year=%d, wday=%d\n", __func__, alm->time.tm_sec,
	217	alm->time.tm_min, alm->time.tm_hour, alm->time.tm_mday,
	218	alm->time.tm_mon, alm->time.tm_year, alm->time.tm_wday);
	219
	220	/* disable interrupt */
	221	err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
	222	if (err < 0)
	223	return err;
	224
	225	/* clear pending interrupt, if any */
	226	err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, &sts, sizeof(sts));
	227	if (err < 0)
	228	return err;
	229
	230	if (alm->enabled)
	231	sts = S35390A_INT2_MODE_ALARM;
	232	else
	233	sts = S35390A_INT2_MODE_NOINTR;
	234
	235	/* This chip expects the bits of each byte to be in reverse order */
	236	sts = bitrev8(sts);
	237
	238	/* set interupt mode*/
	239	err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
	240	if (err < 0)
	241	return err;
	242
	243	if (alm->time.tm_wday != -1)
	244	buf[S35390A_ALRM_BYTE_WDAY] = bin2bcd(alm->time.tm_wday) \| 0x80;
	245
	246	buf[S35390A_ALRM_BYTE_HOURS] = s35390a_hr2reg(s35390a,
	247	alm->time.tm_hour) \| 0x80;
	248	buf[S35390A_ALRM_BYTE_MINS] = bin2bcd(alm->time.tm_min) \| 0x80;
	249
	250	if (alm->time.tm_hour >= 12)
	251	buf[S35390A_ALRM_BYTE_HOURS] \|= 0x40;
	252
	253	for (i = 0; i < 3; ++i)
	254	buf[i] = bitrev8(buf[i]);
	255
	256	err = s35390a_set_reg(s35390a, S35390A_CMD_INT2_REG1, buf,
	257	sizeof(buf));
	258
	259	return err;
	260	}
	261
	262	static int s35390a_read_alarm(struct i2c_client client, struct rtc_wkalrm alm)
	263	{
	264	struct s35390a *s35390a = i2c_get_clientdata(client);
	265	char buf[3], sts;
	266	int i, err;
	267
	268	err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
	269	if (err < 0)
	270	return err;
	271
	272	if (bitrev8(sts) != S35390A_INT2_MODE_ALARM)
273	return -EINVAL;
274
275	err = s35390a_get_reg(s35390a, S35390A_CMD_INT2_REG1, buf, sizeof(buf));
276	if (err < 0)
277	return err;
278
279	/* This chip returns the bits of each byte in reverse order */
280	for (i = 0; i < 3; ++i) {
281	buf[i] = bitrev8(buf[i]);
282	buf[i] &= ~0x80;
283	}
284
285	alm->time.tm_wday = bcd2bin(buf[S35390A_ALRM_BYTE_WDAY]);
286	alm->time.tm_hour = s35390a_reg2hr(s35390a,
287	buf[S35390A_ALRM_BYTE_HOURS]);
288	alm->time.tm_min = bcd2bin(buf[S35390A_ALRM_BYTE_MINS]);
289
290	dev_dbg(&client->dev, "%s: alm is mins=%d, hours=%d, wday=%d\n",
291	__func__, alm->time.tm_min, alm->time.tm_hour,
292	alm->time.tm_wday);
293
294	return 0;
295	}
296
297	static int s35390a_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
298	{
299	return s35390a_read_alarm(to_i2c_client(dev), alm);
300	}
301
302	static int s35390a_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
303	{
304	return s35390a_set_alarm(to_i2c_client(dev), alm);
305	}
306
c46288b0 BB	307	static int s35390a_rtc_read_time(struct device dev, struct rtc_time tm)
	308	{
	309	return s35390a_get_datetime(to_i2c_client(dev), tm);
	310	}
	311
	312	static int s35390a_rtc_set_time(struct device dev, struct rtc_time tm)
	313	{
	314	return s35390a_set_datetime(to_i2c_client(dev), tm);
	315	}
	316
	317	static const struct rtc_class_ops s35390a_rtc_ops = {
	318	.read_time = s35390a_rtc_read_time,
	319	.set_time = s35390a_rtc_set_time,
542dd33a ML	320	.set_alarm = s35390a_rtc_set_alarm,
	321	.read_alarm = s35390a_rtc_read_alarm,
	322
c46288b0 BB	323	};
	324
	325	static struct i2c_driver s35390a_driver;
	326
d2653e92 JD	327	static int s35390a_probe(struct i2c_client *client,
d2653e92 JD	328	const struct i2c_device_id *id)
c46288b0 BB	329	{
	330	int err;
	331	unsigned int i;
	332	struct s35390a *s35390a;
	333	struct rtc_time tm;
	334	char buf[1];
	335
	336	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	337	err = -ENODEV;
	338	goto exit;
	339	}
	340
	341	s35390a = kzalloc(sizeof(struct s35390a), GFP_KERNEL);
	342	if (!s35390a) {
	343	err = -ENOMEM;
	344	goto exit;
	345	}
	346
	347	s35390a->client[0] = client;
	348	i2c_set_clientdata(client, s35390a);
	349
	350	/* This chip uses multiple addresses, use dummy devices for them */
	351	for (i = 1; i < 8; ++i) {
	352	s35390a->client[i] = i2c_new_dummy(client->adapter,
60b129d7	353	client->addr + i);
c46288b0 BB	354	if (!s35390a->client[i]) {
	355	dev_err(&client->dev, "Address %02x unavailable\n",
	356	client->addr + i);
	357	err = -EBUSY;
	358	goto exit_dummy;
	359	}
	360	}
	361
	362	err = s35390a_reset(s35390a);
	363	if (err < 0) {
	364	dev_err(&client->dev, "error resetting chip\n");
	365	goto exit_dummy;
	366	}
	367
	368	err = s35390a_disable_test_mode(s35390a);
	369	if (err < 0) {
	370	dev_err(&client->dev, "error disabling test mode\n");
	371	goto exit_dummy;
	372	}
	373
	374	err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, buf, sizeof(buf));
	375	if (err < 0) {
	376	dev_err(&client->dev, "error checking 12/24 hour mode\n");
	377	goto exit_dummy;
	378	}
	379	if (buf[0] & S35390A_FLAG_24H)
	380	s35390a->twentyfourhour = 1;
	381	else
	382	s35390a->twentyfourhour = 0;
	383
	384	if (s35390a_get_datetime(client, &tm) < 0)
	385	dev_warn(&client->dev, "clock needs to be set\n");
	386
542dd33a ML	387	device_set_wakeup_capable(&client->dev, 1);
542dd33a ML	388
c46288b0 BB	389	s35390a->rtc = rtc_device_register(s35390a_driver.driver.name,
	390	&client->dev, &s35390a_rtc_ops, THIS_MODULE);
	391
	392	if (IS_ERR(s35390a->rtc)) {
	393	err = PTR_ERR(s35390a->rtc);
	394	goto exit_dummy;
	395	}
	396	return 0;
	397
	398	exit_dummy:
	399	for (i = 1; i < 8; ++i)
	400	if (s35390a->client[i])
	401	i2c_unregister_device(s35390a->client[i]);
	402	kfree(s35390a);
c46288b0 BB	403
	404	exit:
	405	return err;
	406	}
	407
	408	static int s35390a_remove(struct i2c_client *client)
	409	{
	410	unsigned int i;
	411
	412	struct s35390a *s35390a = i2c_get_clientdata(client);
	413	for (i = 1; i < 8; ++i)
	414	if (s35390a->client[i])
	415	i2c_unregister_device(s35390a->client[i]);
	416
	417	rtc_device_unregister(s35390a->rtc);
	418	kfree(s35390a);
c46288b0 BB	419
	420	return 0;
	421	}
	422
	423	static struct i2c_driver s35390a_driver = {
	424	.driver = {
	425	.name = "rtc-s35390a",
	426	},
	427	.probe = s35390a_probe,
	428	.remove = s35390a_remove,
3760f736	429	.id_table = s35390a_id,
c46288b0 BB	430	};
c46288b0 BB	431
0abc9201	432	module_i2c_driver(s35390a_driver);
c46288b0 BB	433
	434	MODULE_AUTHOR("Byron Bradley <[email protected]>");
	435	MODULE_DESCRIPTION("S35390A RTC driver");
	436	MODULE_LICENSE("GPL");