/*
 * rtc-fm3130.c - RTC driver for Ramtron FM3130 I2C chip.
 *
 *  Copyright (C) 2008 Sergey Lapin
 *  Based on ds1307 driver by James Chapman and David Brownell
 *
 * 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.
 */

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

#define FM3130_RTC_CONTROL	(0x0)
#define FM3130_CAL_CONTROL	(0x1)
#define FM3130_RTC_SECONDS	(0x2)
#define FM3130_RTC_MINUTES	(0x3)
#define FM3130_RTC_HOURS	(0x4)
#define FM3130_RTC_DAY		(0x5)
#define FM3130_RTC_DATE		(0x6)
#define FM3130_RTC_MONTHS	(0x7)
#define FM3130_RTC_YEARS	(0x8)

#define FM3130_ALARM_SECONDS	(0x9)
#define FM3130_ALARM_MINUTES	(0xa)
#define FM3130_ALARM_HOURS	(0xb)
#define FM3130_ALARM_DATE	(0xc)
#define FM3130_ALARM_MONTHS	(0xd)
#define FM3130_ALARM_WP_CONTROL	(0xe)

#define FM3130_CAL_CONTROL_BIT_nOSCEN (1 << 7) /* Osciallator enabled */
#define FM3130_RTC_CONTROL_BIT_LB (1 << 7) /* Low battery */
#define FM3130_RTC_CONTROL_BIT_AF (1 << 6) /* Alarm flag */
#define FM3130_RTC_CONTROL_BIT_CF (1 << 5) /* Century overflow */
#define FM3130_RTC_CONTROL_BIT_POR (1 << 4) /* Power on reset */
#define FM3130_RTC_CONTROL_BIT_AEN (1 << 3) /* Alarm enable */
#define FM3130_RTC_CONTROL_BIT_CAL (1 << 2) /* Calibration mode */
#define FM3130_RTC_CONTROL_BIT_WRITE (1 << 1) /* W=1 -> write mode W=0 normal */
#define FM3130_RTC_CONTROL_BIT_READ (1 << 0) /* R=1 -> read mode R=0 normal */

#define FM3130_CLOCK_REGS 7
#define FM3130_ALARM_REGS 5

struct fm3130 {
	u8			reg_addr_time;
	u8 			reg_addr_alarm;
	u8			regs[15];
	struct i2c_msg		msg[4];
	struct i2c_client	*client;
	struct rtc_device	*rtc;
	int			data_valid;
	int			alarm;
};
static const struct i2c_device_id fm3130_id[] = {
	{ "fm3130-rtc", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, fm3130_id);

#define FM3130_MODE_NORMAL		0
#define FM3130_MODE_WRITE		1
#define FM3130_MODE_READ		2

static void fm3130_rtc_mode(struct device *dev, int mode)
{
	struct fm3130 *fm3130 = dev_get_drvdata(dev);

	fm3130->regs[FM3130_RTC_CONTROL] =
		i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
	switch (mode) {
	case FM3130_MODE_NORMAL:
		fm3130->regs[FM3130_RTC_CONTROL] &=
			~(FM3130_RTC_CONTROL_BIT_WRITE |
			FM3130_RTC_CONTROL_BIT_READ);
		break;
	case FM3130_MODE_WRITE:
		fm3130->regs[FM3130_RTC_CONTROL] |= FM3130_RTC_CONTROL_BIT_WRITE;
		break;
	case FM3130_MODE_READ:
		fm3130->regs[FM3130_RTC_CONTROL] |= FM3130_RTC_CONTROL_BIT_READ;
		break;
	default:
		dev_dbg(dev, "invalid mode %d\n", mode);
		break;
	}
	/* Checking for alarm */
	if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AF) {
		fm3130->alarm = 1;
		fm3130->regs[FM3130_RTC_CONTROL] &= ~FM3130_RTC_CONTROL_BIT_AF;
	}
	i2c_smbus_write_byte_data(fm3130->client,
		 FM3130_RTC_CONTROL, fm3130->regs[FM3130_RTC_CONTROL]);
}

static int fm3130_get_time(struct device *dev, struct rtc_time *t)
{
	struct fm3130 *fm3130 = dev_get_drvdata(dev);
	int		tmp;

	if (!fm3130->data_valid) {
		/* We have invalid data in RTC, probably due
		to battery faults or other problems. Return EIO
		for now, it will allow us to set data later insted
		of error during probing which disables device */
		return -EIO;
	}
	fm3130_rtc_mode(dev, FM3130_MODE_READ);

	/* read the RTC date and time registers all at once */
	tmp = i2c_transfer(to_i2c_adapter(fm3130->client->dev.parent),
			fm3130->msg, 2);
	if (tmp != 2) {
		dev_err(dev, "%s error %d\n", "read", tmp);
		return -EIO;
	}

	fm3130_rtc_mode(dev, FM3130_MODE_NORMAL);

	dev_dbg(dev, "%s: %02x %02x %02x %02x %02x %02x %02x %02x"
			"%02x %02x %02x %02x %02x %02x %02x\n",
			"read",
			fm3130->regs[0], fm3130->regs[1],
			fm3130->regs[2], fm3130->regs[3],
			fm3130->regs[4], fm3130->regs[5],
			fm3130->regs[6], fm3130->regs[7],
			fm3130->regs[8], fm3130->regs[9],
			fm3130->regs[0xa], fm3130->regs[0xb],
			fm3130->regs[0xc], fm3130->regs[0xd],
			fm3130->regs[0xe]);

	t->tm_sec = BCD2BIN(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
	t->tm_min = BCD2BIN(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
	tmp = fm3130->regs[FM3130_RTC_HOURS] & 0x3f;
	t->tm_hour = BCD2BIN(tmp);
	t->tm_wday = BCD2BIN(fm3130->regs[FM3130_RTC_DAY] & 0x07) - 1;
	t->tm_mday = BCD2BIN(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
	tmp = fm3130->regs[FM3130_RTC_MONTHS] & 0x1f;
	t->tm_mon = BCD2BIN(tmp) - 1;

	/* assume 20YY not 19YY, and ignore CF bit */
	t->tm_year = BCD2BIN(fm3130->regs[FM3130_RTC_YEARS]) + 100;

	dev_dbg(dev, "%s secs=%d, mins=%d, "
		"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
		"read", t->tm_sec, t->tm_min,
		t->tm_hour, t->tm_mday,
		t->tm_mon, t->tm_year, t->tm_wday);

	/* initial clock setting can be undefined */
	return rtc_valid_tm(t);
}


static int fm3130_set_time(struct device *dev, struct rtc_time *t)
{
	struct fm3130 *fm3130 = dev_get_drvdata(dev);
	int		tmp, i;
	u8		*buf = fm3130->regs;

	dev_dbg(dev, "%s secs=%d, mins=%d, "
		"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
		"write", t->tm_sec, t->tm_min,
		t->tm_hour, t->tm_mday,
		t->tm_mon, t->tm_year, t->tm_wday);

	/* first register addr */
	buf[FM3130_RTC_SECONDS] = BIN2BCD(t->tm_sec);
	buf[FM3130_RTC_MINUTES] = BIN2BCD(t->tm_min);
	buf[FM3130_RTC_HOURS] = BIN2BCD(t->tm_hour);
	buf[FM3130_RTC_DAY] = BIN2BCD(t->tm_wday + 1);
	buf[FM3130_RTC_DATE] = BIN2BCD(t->tm_mday);
	buf[FM3130_RTC_MONTHS] = BIN2BCD(t->tm_mon + 1);

	/* assume 20YY not 19YY */
	tmp = t->tm_year - 100;
	buf[FM3130_RTC_YEARS] = BIN2BCD(tmp);

	dev_dbg(dev, "%s: %02x %02x %02x %02x %02x %02x %02x"
		"%02x %02x %02x %02x %02x %02x %02x %02x\n",
		"write", buf[0], buf[1], buf[2], buf[3],
		buf[4], buf[5], buf[6], buf[7],
		buf[8], buf[9], buf[0xa], buf[0xb],
		buf[0xc], buf[0xd], buf[0xe]);

	fm3130_rtc_mode(dev, FM3130_MODE_WRITE);

	/* Writing time registers, we don't support multibyte transfers */
	for (i = 0; i < FM3130_CLOCK_REGS; i++) {
		i2c_smbus_write_byte_data(fm3130->client,
					FM3130_RTC_SECONDS + i,
					fm3130->regs[FM3130_RTC_SECONDS + i]);
	}

	fm3130_rtc_mode(dev, FM3130_MODE_NORMAL);

	/* We assume here that data are valid once written */
	if (!fm3130->data_valid)
		fm3130->data_valid = 1;
	return 0;
}

static int fm3130_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct fm3130 *fm3130 = dev_get_drvdata(dev);
	int tmp;
	struct rtc_time *tm = &alrm->time;
	/* read the RTC alarm registers all at once */
	tmp = i2c_transfer(to_i2c_adapter(fm3130->client->dev.parent),
			&fm3130->msg[2], 2);
	if (tmp != 2) {
		dev_err(dev, "%s error %d\n", "read", tmp);
		return -EIO;
	}
	dev_dbg(dev, "alarm read %02x %02x %02x %02x %02x\n",
			fm3130->regs[FM3130_ALARM_SECONDS],
			fm3130->regs[FM3130_ALARM_MINUTES],
			fm3130->regs[FM3130_ALARM_HOURS],
			fm3130->regs[FM3130_ALARM_DATE],
			fm3130->regs[FM3130_ALARM_MONTHS]);


	tm->tm_sec	= BCD2BIN(fm3130->regs[FM3130_ALARM_SECONDS] & 0x7F);
	tm->tm_min	= BCD2BIN(fm3130->regs[FM3130_ALARM_MINUTES] & 0x7F);
	tm->tm_hour	= BCD2BIN(fm3130->regs[FM3130_ALARM_HOURS] & 0x3F);
	tm->tm_mday	= BCD2BIN(fm3130->regs[FM3130_ALARM_DATE] & 0x3F);
	tm->tm_mon	= BCD2BIN(fm3130->regs[FM3130_ALARM_MONTHS] & 0x1F);
	if (tm->tm_mon > 0)
		tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
	dev_dbg(dev, "%s secs=%d, mins=%d, "
		"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
		"read alarm", tm->tm_sec, tm->tm_min,
		tm->tm_hour, tm->tm_mday,
		tm->tm_mon, tm->tm_year, tm->tm_wday);

	return 0;
}

static int fm3130_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct fm3130 *fm3130 = dev_get_drvdata(dev);
	struct rtc_time *tm = &alrm->time;
	int i;

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

	if (tm->tm_sec != -1)
		fm3130->regs[FM3130_ALARM_SECONDS] =
			BIN2BCD(tm->tm_sec) | 0x80;

	if (tm->tm_min != -1)
		fm3130->regs[FM3130_ALARM_MINUTES] =
			BIN2BCD(tm->tm_min) | 0x80;

	if (tm->tm_hour != -1)
		fm3130->regs[FM3130_ALARM_HOURS] =
			BIN2BCD(tm->tm_hour) | 0x80;

	if (tm->tm_mday != -1)
		fm3130->regs[FM3130_ALARM_DATE] =
			BIN2BCD(tm->tm_mday) | 0x80;

	if (tm->tm_mon != -1)
		fm3130->regs[FM3130_ALARM_MONTHS] =
			BIN2BCD(tm->tm_mon + 1) | 0x80;

	dev_dbg(dev, "alarm write %02x %02x %02x %02x %02x\n",
			fm3130->regs[FM3130_ALARM_SECONDS],
			fm3130->regs[FM3130_ALARM_MINUTES],
			fm3130->regs[FM3130_ALARM_HOURS],
			fm3130->regs[FM3130_ALARM_DATE],
			fm3130->regs[FM3130_ALARM_MONTHS]);
	/* Writing time registers, we don't support multibyte transfers */
	for (i = 0; i < FM3130_ALARM_REGS; i++) {
		i2c_smbus_write_byte_data(fm3130->client,
					FM3130_ALARM_SECONDS + i,
					fm3130->regs[FM3130_ALARM_SECONDS + i]);
	}
	fm3130->regs[FM3130_RTC_CONTROL] =
		i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
	/* Checking for alarm */
	if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AF) {
		fm3130->alarm = 1;
		fm3130->regs[FM3130_RTC_CONTROL] &= ~FM3130_RTC_CONTROL_BIT_AF;
	}
	if (alrm->enabled) {
		i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL,
			(fm3130->regs[FM3130_RTC_CONTROL] &
				~(FM3130_RTC_CONTROL_BIT_CAL)) |
					FM3130_RTC_CONTROL_BIT_AEN);
	} else {
		i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL,
			fm3130->regs[FM3130_RTC_CONTROL] &
				~(FM3130_RTC_CONTROL_BIT_AEN));
	}
	return 0;
}

static const struct rtc_class_ops fm3130_rtc_ops = {
	.read_time	= fm3130_get_time,
	.set_time	= fm3130_set_time,
	.read_alarm	= fm3130_read_alarm,
	.set_alarm	= fm3130_set_alarm,
};

static struct i2c_driver fm3130_driver;

static int __devinit fm3130_probe(struct i2c_client *client,
				  const struct i2c_device_id *id)
{
	struct fm3130		*fm3130;
	int			err = -ENODEV;
	int			tmp;
	struct i2c_adapter	*adapter = to_i2c_adapter(client->dev.parent);

	if (!i2c_check_functionality(adapter,
			I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
		return -EIO;

	fm3130 = kzalloc(sizeof(struct fm3130), GFP_KERNEL);

	if (!fm3130)
		return -ENOMEM;

	fm3130->client = client;
	i2c_set_clientdata(client, fm3130);
	fm3130->reg_addr_time = FM3130_RTC_SECONDS;
	fm3130->reg_addr_alarm = FM3130_ALARM_SECONDS;

	/* Messages to read time */
	fm3130->msg[0].addr = client->addr;
	fm3130->msg[0].flags = 0;
	fm3130->msg[0].len = 1;
	fm3130->msg[0].buf = &fm3130->reg_addr_time;

	fm3130->msg[1].addr = client->addr;
	fm3130->msg[1].flags = I2C_M_RD;
	fm3130->msg[1].len = FM3130_CLOCK_REGS;
	fm3130->msg[1].buf = &fm3130->regs[FM3130_RTC_SECONDS];

	/* Messages to read alarm */
	fm3130->msg[2].addr = client->addr;
	fm3130->msg[2].flags = 0;
	fm3130->msg[2].len = 1;
	fm3130->msg[2].buf = &fm3130->reg_addr_alarm;

	fm3130->msg[3].addr = client->addr;
	fm3130->msg[3].flags = I2C_M_RD;
	fm3130->msg[3].len = FM3130_ALARM_REGS;
	fm3130->msg[3].buf = &fm3130->regs[FM3130_ALARM_SECONDS];

	fm3130->data_valid = 0;

	tmp = i2c_transfer(adapter, fm3130->msg, 4);
	if (tmp != 4) {
		pr_debug("read error %d\n", tmp);
		err = -EIO;
		goto exit_free;
	}

	fm3130->regs[FM3130_RTC_CONTROL] =
		i2c_smbus_read_byte_data(client, FM3130_RTC_CONTROL);
	fm3130->regs[FM3130_CAL_CONTROL] =
		i2c_smbus_read_byte_data(client, FM3130_CAL_CONTROL);

	/* Checking for alarm */
	if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AF) {
		fm3130->alarm = 1;
		fm3130->regs[FM3130_RTC_CONTROL] &= ~FM3130_RTC_CONTROL_BIT_AF;
	}

	/* Disabling calibration mode */
	if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_CAL)
		i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
			fm3130->regs[FM3130_RTC_CONTROL] &
				~(FM3130_RTC_CONTROL_BIT_CAL));
		dev_warn(&client->dev, "Disabling calibration mode!\n");

	/* Disabling read and write modes */
	if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_WRITE ||
	    fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_READ)
		i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
			fm3130->regs[FM3130_RTC_CONTROL] &
				~(FM3130_RTC_CONTROL_BIT_READ |
					FM3130_RTC_CONTROL_BIT_WRITE));
		dev_warn(&client->dev, "Disabling READ or WRITE mode!\n");

	/* oscillator off?  turn it on, so clock can tick. */
	if (fm3130->regs[FM3130_CAL_CONTROL] & FM3130_CAL_CONTROL_BIT_nOSCEN)
		i2c_smbus_write_byte_data(client, FM3130_CAL_CONTROL,
			fm3130->regs[FM3130_CAL_CONTROL] &
				~(FM3130_CAL_CONTROL_BIT_nOSCEN));

	/* oscillator fault?  clear flag, and warn */
	if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_LB)
		dev_warn(&client->dev, "Low battery!\n");

	/* oscillator fault?  clear flag, and warn */
	if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_POR) {
		i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
			fm3130->regs[FM3130_RTC_CONTROL] &
				~FM3130_RTC_CONTROL_BIT_POR);
		dev_warn(&client->dev, "SET TIME!\n");
	}
	/* ACS is controlled by alarm */
	i2c_smbus_write_byte_data(client, FM3130_ALARM_WP_CONTROL, 0x80);

	/* TODO */
	/* TODO need to sanity check alarm */
	tmp = fm3130->regs[FM3130_RTC_SECONDS];
	tmp = BCD2BIN(tmp & 0x7f);
	if (tmp > 60)
		goto exit_bad;
	tmp = BCD2BIN(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
	if (tmp > 60)
		goto exit_bad;

	tmp = BCD2BIN(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
	if (tmp == 0 || tmp > 31)
		goto exit_bad;

	tmp = BCD2BIN(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f);
	if (tmp == 0 || tmp > 12)
		goto exit_bad;

	tmp = fm3130->regs[FM3130_RTC_HOURS];

	fm3130->data_valid = 1;

exit_bad:
	if (!fm3130->data_valid)
		dev_dbg(&client->dev,
				"%s: %02x %02x %02x %02x %02x %02x %02x %02x"
				"%02x %02x %02x %02x %02x %02x %02x\n",
			"bogus registers",
			fm3130->regs[0], fm3130->regs[1],
			fm3130->regs[2], fm3130->regs[3],
			fm3130->regs[4], fm3130->regs[5],
			fm3130->regs[6], fm3130->regs[7],
			fm3130->regs[8], fm3130->regs[9],
			fm3130->regs[0xa], fm3130->regs[0xb],
			fm3130->regs[0xc], fm3130->regs[0xd],
			fm3130->regs[0xe]);

	/* We won't bail out here because we just got invalid data.
	   Time setting from u-boot doesn't work anyway */
	fm3130->rtc = rtc_device_register(client->name, &client->dev,
				&fm3130_rtc_ops, THIS_MODULE);
	if (IS_ERR(fm3130->rtc)) {
		err = PTR_ERR(fm3130->rtc);
		dev_err(&client->dev,
			"unable to register the class device\n");
		goto exit_free;
	}
	return 0;
exit_free:
	kfree(fm3130);
	return err;
}

static int __devexit fm3130_remove(struct i2c_client *client)
{
	struct fm3130 *fm3130 = i2c_get_clientdata(client);

	rtc_device_unregister(fm3130->rtc);
	kfree(fm3130);
	return 0;
}

static struct i2c_driver fm3130_driver = {
	.driver = {
		.name	= "rtc-fm3130",
		.owner	= THIS_MODULE,
	},
	.probe		= fm3130_probe,
	.remove		= __devexit_p(fm3130_remove),
	.id_table	= fm3130_id,
};

static int __init fm3130_init(void)
{
	return i2c_add_driver(&fm3130_driver);
}
module_init(fm3130_init);

static void __exit fm3130_exit(void)
{
	i2c_del_driver(&fm3130_driver);
}
module_exit(fm3130_exit);

MODULE_DESCRIPTION("RTC driver for FM3130");
MODULE_AUTHOR("Sergey Lapin <slapin@ossfans.org>");
MODULE_LICENSE("GPL");