[linux-2.6-block.git] / drivers / rtc / rtc-rx8010.c

/*
 * Driver for the Epson RTC module RX-8010 SJ
 *
 * Copyright(C) Timesys Corporation 2015
 * Copyright(C) General Electric Company 2015
 *
 * 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/bcd.h>
#include <linux/bitops.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rtc.h>

#define RX8010_SEC     0x10
#define RX8010_MIN     0x11
#define RX8010_HOUR    0x12
#define RX8010_WDAY    0x13
#define RX8010_MDAY    0x14
#define RX8010_MONTH   0x15
#define RX8010_YEAR    0x16
#define RX8010_YEAR    0x16
#define RX8010_RESV17  0x17
#define RX8010_ALMIN   0x18
#define RX8010_ALHOUR  0x19
#define RX8010_ALWDAY  0x1A
#define RX8010_TCOUNT0 0x1B
#define RX8010_TCOUNT1 0x1C
#define RX8010_EXT     0x1D
#define RX8010_FLAG    0x1E
#define RX8010_CTRL    0x1F
/* 0x20 to 0x2F are user registers */
#define RX8010_RESV30  0x30
#define RX8010_RESV31  0x32
#define RX8010_IRQ     0x32

#define RX8010_EXT_WADA  BIT(3)

#define RX8010_FLAG_VLF  BIT(1)
#define RX8010_FLAG_AF   BIT(3)
#define RX8010_FLAG_TF   BIT(4)
#define RX8010_FLAG_UF   BIT(5)

#define RX8010_CTRL_AIE  BIT(3)
#define RX8010_CTRL_UIE  BIT(5)
#define RX8010_CTRL_STOP BIT(6)
#define RX8010_CTRL_TEST BIT(7)

#define RX8010_ALARM_AE  BIT(7)

static const struct i2c_device_id rx8010_id[] = {
	{ "rx8010", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, rx8010_id);

struct rx8010_data {
	struct i2c_client *client;
	struct rtc_device *rtc;
	u8 ctrlreg;
	spinlock_t flags_lock;
};

static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
{
	struct i2c_client *client = dev_id;
	struct rx8010_data *rx8010 = i2c_get_clientdata(client);
	int flagreg;

	spin_lock(&rx8010->flags_lock);

	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);

	if (flagreg <= 0) {
		spin_unlock(&rx8010->flags_lock);
		return IRQ_NONE;
	}

	if (flagreg & RX8010_FLAG_VLF)
		dev_warn(&client->dev, "Frequency stop detected\n");

	if (flagreg & RX8010_FLAG_TF) {
		flagreg &= ~RX8010_FLAG_TF;
		rtc_update_irq(rx8010->rtc, 1, RTC_PF | RTC_IRQF);
	}

	if (flagreg & RX8010_FLAG_AF) {
		flagreg &= ~RX8010_FLAG_AF;
		rtc_update_irq(rx8010->rtc, 1, RTC_AF | RTC_IRQF);
	}

	if (flagreg & RX8010_FLAG_UF) {
		flagreg &= ~RX8010_FLAG_UF;
		rtc_update_irq(rx8010->rtc, 1, RTC_UF | RTC_IRQF);
	}

	i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg);

	spin_unlock(&rx8010->flags_lock);
	return IRQ_HANDLED;
}

static int rx8010_get_time(struct device *dev, struct rtc_time *dt)
{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	u8 date[7];
	int flagreg;
	int err;

	flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
	if (flagreg < 0)
		return flagreg;

	if (flagreg & RX8010_FLAG_VLF) {
		dev_warn(dev, "Frequency stop detected\n");
		return -EINVAL;
	}

	err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_SEC,
					    7, date);
	if (err != 7)
		return err < 0 ? err : -EIO;

	dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
	dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
	dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
	dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
	dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1;
	dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100;
	dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f);

	return rtc_valid_tm(dt);
}

static int rx8010_set_time(struct device *dev, struct rtc_time *dt)
{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	u8 date[7];
	int ctrl, flagreg;
	int ret;
	unsigned long irqflags;

	if ((dt->tm_year < 100) || (dt->tm_year > 199))
		return -EINVAL;

	/* set STOP bit before changing clock/calendar */
	ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
	if (ctrl < 0)
		return ctrl;
	rx8010->ctrlreg = ctrl | RX8010_CTRL_STOP;
	ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
					rx8010->ctrlreg);
	if (ret < 0)
		return ret;

	date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec);
	date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min);
	date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour);
	date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday);
	date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1);
	date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100);
	date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday);

	ret = i2c_smbus_write_i2c_block_data(rx8010->client,
					     RX8010_SEC, 7, date);
	if (ret < 0)
		return ret;

	/* clear STOP bit after changing clock/calendar */
	ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
	if (ctrl < 0)
		return ctrl;
	rx8010->ctrlreg = ctrl & ~RX8010_CTRL_STOP;
	ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
					rx8010->ctrlreg);
	if (ret < 0)
		return ret;

	spin_lock_irqsave(&rx8010->flags_lock, irqflags);

	flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
	if (flagreg < 0) {
		spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);
		return flagreg;
	}

	if (flagreg & RX8010_FLAG_VLF)
		ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG,
						flagreg & ~RX8010_FLAG_VLF);

	spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);

	return 0;
}

static int rx8010_init_client(struct i2c_client *client)
{
	struct rx8010_data *rx8010 = i2c_get_clientdata(client);
	u8 ctrl[2];
	int need_clear = 0, err = 0;

	/* Initialize reserved registers as specified in datasheet */
	err = i2c_smbus_write_byte_data(client, RX8010_RESV17, 0xD8);
	if (err < 0)
		return err;

	err = i2c_smbus_write_byte_data(client, RX8010_RESV30, 0x00);
	if (err < 0)
		return err;

	err = i2c_smbus_write_byte_data(client, RX8010_RESV31, 0x08);
	if (err < 0)
		return err;

	err = i2c_smbus_write_byte_data(client, RX8010_IRQ, 0x00);
	if (err < 0)
		return err;

	err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_FLAG,
					    2, ctrl);
	if (err != 2)
		return err < 0 ? err : -EIO;

	if (ctrl[0] & RX8010_FLAG_VLF)
		dev_warn(&client->dev, "Frequency stop was detected\n");

	if (ctrl[0] & RX8010_FLAG_AF) {
		dev_warn(&client->dev, "Alarm was detected\n");
		need_clear = 1;
	}

	if (ctrl[0] & RX8010_FLAG_TF)
		need_clear = 1;

	if (ctrl[0] & RX8010_FLAG_UF)
		need_clear = 1;

	if (need_clear) {
		ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF);
		err = i2c_smbus_write_byte_data(client, RX8010_FLAG, ctrl[0]);
		if (err < 0)
			return err;
	}

	rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST);

	return err;
}

static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t)
{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	struct i2c_client *client = rx8010->client;
	u8 alarmvals[3];
	int flagreg;
	int err;

	err = i2c_smbus_read_i2c_block_data(client, RX8010_ALMIN, 3, alarmvals);
	if (err != 3)
		return err < 0 ? err : -EIO;

	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
	if (flagreg < 0)
		return flagreg;

	t->time.tm_sec = 0;
	t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
	t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);

	if (alarmvals[2] & RX8010_ALARM_AE)
		t->time.tm_mday = -1;
	else
		t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f);

	t->time.tm_wday = -1;
	t->time.tm_mon = -1;
	t->time.tm_year = -1;

	t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE);
	t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled;

	return err;
}

static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	u8 alarmvals[3];
	int extreg, flagreg;
	int err;
	unsigned long irqflags;

	spin_lock_irqsave(&rx8010->flags_lock, irqflags);
	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
	if (flagreg < 0) {
		spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);
		return flagreg;
	}

	if (rx8010->ctrlreg & (RX8010_CTRL_AIE | RX8010_CTRL_UIE)) {
		rx8010->ctrlreg &= ~(RX8010_CTRL_AIE | RX8010_CTRL_UIE);
		err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
						rx8010->ctrlreg);
		if (err < 0) {
			spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);
			return err;
		}
	}

	flagreg &= ~RX8010_FLAG_AF;
	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
	spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);
	if (err < 0)
		return err;

	alarmvals[0] = bin2bcd(t->time.tm_min);
	alarmvals[1] = bin2bcd(t->time.tm_hour);
	alarmvals[2] = bin2bcd(t->time.tm_mday);

	err = i2c_smbus_write_i2c_block_data(rx8010->client, RX8010_ALMIN,
					     2, alarmvals);
	if (err < 0)
		return err;

	extreg = i2c_smbus_read_byte_data(client, RX8010_EXT);
	if (extreg < 0)
		return extreg;

	extreg |= RX8010_EXT_WADA;
	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_EXT, extreg);
	if (err < 0)
		return err;

	if (alarmvals[2] == 0)
		alarmvals[2] |= RX8010_ALARM_AE;

	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_ALWDAY,
					alarmvals[2]);
	if (err < 0)
		return err;

	if (t->enabled) {
		if (rx8010->rtc->uie_rtctimer.enabled)
			rx8010->ctrlreg |= RX8010_CTRL_UIE;
		if (rx8010->rtc->aie_timer.enabled)
			rx8010->ctrlreg |=
				(RX8010_CTRL_AIE | RX8010_CTRL_UIE);

		err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
						rx8010->ctrlreg);
		if (err < 0)
			return err;
	}

	return 0;
}

static int rx8010_alarm_irq_enable(struct device *dev,
				   unsigned int enabled)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	int flagreg;
	u8 ctrl;
	int err;

	ctrl = rx8010->ctrlreg;

	if (enabled) {
		if (rx8010->rtc->uie_rtctimer.enabled)
			ctrl |= RX8010_CTRL_UIE;
		if (rx8010->rtc->aie_timer.enabled)
			ctrl |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE);
	} else {
		if (!rx8010->rtc->uie_rtctimer.enabled)
			ctrl &= ~RX8010_CTRL_UIE;
		if (!rx8010->rtc->aie_timer.enabled)
			ctrl &= ~RX8010_CTRL_AIE;
	}

	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
	if (flagreg < 0)
		return flagreg;

	flagreg &= ~RX8010_FLAG_AF;
	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
	if (err < 0)
		return err;

	if (ctrl != rx8010->ctrlreg) {
		rx8010->ctrlreg = ctrl;
		err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
						rx8010->ctrlreg);
		if (err < 0)
			return err;
	}

	return 0;
}

static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	int ret, tmp;
	int flagreg;
	unsigned long irqflags;

	switch (cmd) {
	case RTC_VL_READ:
		flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
		if (flagreg < 0)
			return flagreg;

		tmp = !!(flagreg & RX8010_FLAG_VLF);
		if (copy_to_user((void __user *)arg, &tmp, sizeof(int)))
			return -EFAULT;

		return 0;

	case RTC_VL_CLR:
		spin_lock_irqsave(&rx8010->flags_lock, irqflags);
		flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
		if (flagreg < 0) {
			spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);
			return flagreg;
		}

		flagreg &= ~RX8010_FLAG_VLF;
		ret = i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg);
		spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);
		if (ret < 0)
			return ret;

		return 0;

	default:
		return -ENOIOCTLCMD;
	}
}

static struct rtc_class_ops rx8010_rtc_ops = {
	.read_time = rx8010_get_time,
	.set_time = rx8010_set_time,
	.ioctl = rx8010_ioctl,
};

static int rx8010_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	struct rx8010_data *rx8010;
	int err = 0;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
		| I2C_FUNC_SMBUS_I2C_BLOCK)) {
		dev_err(&adapter->dev, "doesn't support required functionality\n");
		return -EIO;
	}

	rx8010 = devm_kzalloc(&client->dev, sizeof(struct rx8010_data),
			      GFP_KERNEL);
	if (!rx8010)
		return -ENOMEM;

	rx8010->client = client;
	i2c_set_clientdata(client, rx8010);

	spin_lock_init(&rx8010->flags_lock);

	err = rx8010_init_client(client);
	if (err)
		return err;

	if (client->irq > 0) {
		dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
		err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
						rx8010_irq_1_handler,
						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
						"rx8010", client);

		if (err) {
			dev_err(&client->dev, "unable to request IRQ\n");
			client->irq = 0;
		} else {
			rx8010_rtc_ops.read_alarm = rx8010_read_alarm;
			rx8010_rtc_ops.set_alarm = rx8010_set_alarm;
			rx8010_rtc_ops.alarm_irq_enable = rx8010_alarm_irq_enable;
		}
	}

	rx8010->rtc = devm_rtc_device_register(&client->dev, client->name,
		&rx8010_rtc_ops, THIS_MODULE);

	if (IS_ERR(rx8010->rtc)) {
		dev_err(&client->dev, "unable to register the class device\n");
		return PTR_ERR(rx8010->rtc);
	}

	rx8010->rtc->max_user_freq = 1;

	return err;
}

static struct i2c_driver rx8010_driver = {
	.driver = {
		.name = "rtc-rx8010",
	},
	.probe		= rx8010_probe,
	.id_table	= rx8010_id,
};

module_i2c_driver(rx8010_driver);

MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>");
MODULE_DESCRIPTION("Epson RX8010SJ RTC driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
ed13d89b AB	1	/*
	2	* Driver for the Epson RTC module RX-8010 SJ
	3	*
	4	* Copyright(C) Timesys Corporation 2015
	5	* Copyright(C) General Electric Company 2015
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	*/
	12
	13	#include <linux/bcd.h>
	14	#include <linux/bitops.h>
	15	#include <linux/i2c.h>
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/rtc.h>
	19
	20	#define RX8010_SEC 0x10
	21	#define RX8010_MIN 0x11
	22	#define RX8010_HOUR 0x12
	23	#define RX8010_WDAY 0x13
	24	#define RX8010_MDAY 0x14
	25	#define RX8010_MONTH 0x15
	26	#define RX8010_YEAR 0x16
	27	#define RX8010_YEAR 0x16
	28	#define RX8010_RESV17 0x17
	29	#define RX8010_ALMIN 0x18
	30	#define RX8010_ALHOUR 0x19
	31	#define RX8010_ALWDAY 0x1A
	32	#define RX8010_TCOUNT0 0x1B
	33	#define RX8010_TCOUNT1 0x1C
	34	#define RX8010_EXT 0x1D
	35	#define RX8010_FLAG 0x1E
	36	#define RX8010_CTRL 0x1F
	37	/* 0x20 to 0x2F are user registers */
	38	#define RX8010_RESV30 0x30
	39	#define RX8010_RESV31 0x32
	40	#define RX8010_IRQ 0x32
	41
	42	#define RX8010_EXT_WADA BIT(3)
	43
	44	#define RX8010_FLAG_VLF BIT(1)
	45	#define RX8010_FLAG_AF BIT(3)
	46	#define RX8010_FLAG_TF BIT(4)
	47	#define RX8010_FLAG_UF BIT(5)
	48
	49	#define RX8010_CTRL_AIE BIT(3)
	50	#define RX8010_CTRL_UIE BIT(5)
	51	#define RX8010_CTRL_STOP BIT(6)
	52	#define RX8010_CTRL_TEST BIT(7)
	53
	54	#define RX8010_ALARM_AE BIT(7)
	55
	56	static const struct i2c_device_id rx8010_id[] = {
	57	{ "rx8010", 0 },
	58	{ }
	59	};
	60	MODULE_DEVICE_TABLE(i2c, rx8010_id);
	61
	62	struct rx8010_data {
	63	struct i2c_client *client;
	64	struct rtc_device *rtc;
65	u8 ctrlreg;
66	spinlock_t flags_lock;
67	};
68
69	static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
70	{
71	struct i2c_client *client = dev_id;
72	struct rx8010_data *rx8010 = i2c_get_clientdata(client);
73	int flagreg;
74
75	spin_lock(&rx8010->flags_lock);
76
77	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
78
79	if (flagreg <= 0) {
80	spin_unlock(&rx8010->flags_lock);
81	return IRQ_NONE;
82	}
83
84	if (flagreg & RX8010_FLAG_VLF)
85	dev_warn(&client->dev, "Frequency stop detected\n");
86
87	if (flagreg & RX8010_FLAG_TF) {
88	flagreg &= ~RX8010_FLAG_TF;
89	rtc_update_irq(rx8010->rtc, 1, RTC_PF \| RTC_IRQF);
90	}
91
92	if (flagreg & RX8010_FLAG_AF) {
93	flagreg &= ~RX8010_FLAG_AF;
94	rtc_update_irq(rx8010->rtc, 1, RTC_AF \| RTC_IRQF);
95	}
96
97	if (flagreg & RX8010_FLAG_UF) {
98	flagreg &= ~RX8010_FLAG_UF;
99	rtc_update_irq(rx8010->rtc, 1, RTC_UF \| RTC_IRQF);
100	}
101
102	i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg);
103
104	spin_unlock(&rx8010->flags_lock);
105	return IRQ_HANDLED;
106	}
107
108	static int rx8010_get_time(struct device dev, struct rtc_time dt)
109	{
110	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
111	u8 date[7];
112	int flagreg;
113	int err;
114
115	flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
116	if (flagreg < 0)
117	return flagreg;
118
119	if (flagreg & RX8010_FLAG_VLF) {
120	dev_warn(dev, "Frequency stop detected\n");
121	return -EINVAL;
122	}
123
124	err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_SEC,
125	7, date);
126	if (err != 7)
127	return err < 0 ? err : -EIO;
128
129	dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
130	dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
131	dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
132	dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
133	dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1;
134	dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100;
135	dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f);
136
137	return rtc_valid_tm(dt);
138	}
139
140	static int rx8010_set_time(struct device dev, struct rtc_time dt)
141	{
142	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
143	u8 date[7];
144	int ctrl, flagreg;
145	int ret;
146	unsigned long irqflags;
147
148	if ((dt->tm_year < 100) \|\| (dt->tm_year > 199))
149	return -EINVAL;
150
151	/* set STOP bit before changing clock/calendar */
152	ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
153	if (ctrl < 0)
154	return ctrl;
155	rx8010->ctrlreg = ctrl \| RX8010_CTRL_STOP;
156	ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
157	rx8010->ctrlreg);
158	if (ret < 0)
159	return ret;
160
161	date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec);
162	date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min);
163	date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour);
164	date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday);
165	date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1);
166	date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100);
167	date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday);
168
169	ret = i2c_smbus_write_i2c_block_data(rx8010->client,
170	RX8010_SEC, 7, date);
171	if (ret < 0)
172	return ret;
173
174	/* clear STOP bit after changing clock/calendar */
175	ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
176	if (ctrl < 0)
177	return ctrl;
178	rx8010->ctrlreg = ctrl & ~RX8010_CTRL_STOP;
179	ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
180	rx8010->ctrlreg);
181	if (ret < 0)
182	return ret;
183
184	spin_lock_irqsave(&rx8010->flags_lock, irqflags);
185
186	flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
187	if (flagreg < 0) {
188	spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);
189	return flagreg;
190	}
191
192	if (flagreg & RX8010_FLAG_VLF)
193	ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG,
194	flagreg & ~RX8010_FLAG_VLF);
195
196	spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);
197
198	return 0;
199	}
200
201	static int rx8010_init_client(struct i2c_client *client)
202	{
203	struct rx8010_data *rx8010 = i2c_get_clientdata(client);
204	u8 ctrl[2];
205	int need_clear = 0, err = 0;
206
207	/* Initialize reserved registers as specified in datasheet */
208	err = i2c_smbus_write_byte_data(client, RX8010_RESV17, 0xD8);
209	if (err < 0)
210	return err;
211
212	err = i2c_smbus_write_byte_data(client, RX8010_RESV30, 0x00);
213	if (err < 0)
214	return err;
215
216	err = i2c_smbus_write_byte_data(client, RX8010_RESV31, 0x08);
217	if (err < 0)
218	return err;
219
220	err = i2c_smbus_write_byte_data(client, RX8010_IRQ, 0x00);
221	if (err < 0)
222	return err;
223
224	err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_FLAG,
225	2, ctrl);
226	if (err != 2)
227	return err < 0 ? err : -EIO;
228
229	if (ctrl[0] & RX8010_FLAG_VLF)
230	dev_warn(&client->dev, "Frequency stop was detected\n");
231
232	if (ctrl[0] & RX8010_FLAG_AF) {
233	dev_warn(&client->dev, "Alarm was detected\n");
234	need_clear = 1;
235	}
236
237	if (ctrl[0] & RX8010_FLAG_TF)
238	need_clear = 1;
239
240	if (ctrl[0] & RX8010_FLAG_UF)
241	need_clear = 1;
242
243	if (need_clear) {
244	ctrl[0] &= ~(RX8010_FLAG_AF \| RX8010_FLAG_TF \| RX8010_FLAG_UF);
245	err = i2c_smbus_write_byte_data(client, RX8010_FLAG, ctrl[0]);
246	if (err < 0)
247	return err;
248	}
249
250	rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST);
251
252	return err;
253	}
254
255	static int rx8010_read_alarm(struct device dev, struct rtc_wkalrm t)
256	{
257	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
258	struct i2c_client *client = rx8010->client;
259	u8 alarmvals[3];
260	int flagreg;
261	int err;
262
263	err = i2c_smbus_read_i2c_block_data(client, RX8010_ALMIN, 3, alarmvals);
264	if (err != 3)
265	return err < 0 ? err : -EIO;
266
267	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
268	if (flagreg < 0)
269	return flagreg;
270
271	t->time.tm_sec = 0;
272	t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
273	t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
274
275	if (alarmvals[2] & RX8010_ALARM_AE)
276	t->time.tm_mday = -1;
277	else
278	t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f);
279
280	t->time.tm_wday = -1;
281	t->time.tm_mon = -1;
282	t->time.tm_year = -1;
283
284	t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE);
285	t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled;
286
287	return err;
288	}
289
290	static int rx8010_set_alarm(struct device dev, struct rtc_wkalrm t)
291	{
292	struct i2c_client *client = to_i2c_client(dev);
293	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
294	u8 alarmvals[3];
295	int extreg, flagreg;
296	int err;
297	unsigned long irqflags;
298
299	spin_lock_irqsave(&rx8010->flags_lock, irqflags);
300	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
301	if (flagreg < 0) {
302	spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);
303	return flagreg;
304	}
305
306	if (rx8010->ctrlreg & (RX8010_CTRL_AIE \| RX8010_CTRL_UIE)) {
307	rx8010->ctrlreg &= ~(RX8010_CTRL_AIE \| RX8010_CTRL_UIE);
308	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
309	rx8010->ctrlreg);
310	if (err < 0) {
311	spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);
312	return err;
313	}
314	}
315
316	flagreg &= ~RX8010_FLAG_AF;
317	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
318	spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);
319	if (err < 0)
320	return err;
321
322	alarmvals[0] = bin2bcd(t->time.tm_min);
323	alarmvals[1] = bin2bcd(t->time.tm_hour);
324	alarmvals[2] = bin2bcd(t->time.tm_mday);
325
326	err = i2c_smbus_write_i2c_block_data(rx8010->client, RX8010_ALMIN,
327	2, alarmvals);
328	if (err < 0)
329	return err;
330
331	extreg = i2c_smbus_read_byte_data(client, RX8010_EXT);
332	if (extreg < 0)
333	return extreg;
334
335	extreg \|= RX8010_EXT_WADA;
336	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_EXT, extreg);
337	if (err < 0)
338	return err;
339
340	if (alarmvals[2] == 0)
341	alarmvals[2] \|= RX8010_ALARM_AE;
342
343	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_ALWDAY,
344	alarmvals[2]);
345	if (err < 0)
346	return err;
347
348	if (t->enabled) {
349	if (rx8010->rtc->uie_rtctimer.enabled)
350	rx8010->ctrlreg \|= RX8010_CTRL_UIE;
351	if (rx8010->rtc->aie_timer.enabled)
352	rx8010->ctrlreg \|=
353	(RX8010_CTRL_AIE \| RX8010_CTRL_UIE);
354
355	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
356	rx8010->ctrlreg);
357	if (err < 0)
358	return err;
359	}
360
361	return 0;
362	}
363
364	static int rx8010_alarm_irq_enable(struct device *dev,
365	unsigned int enabled)
366	{
367	struct i2c_client *client = to_i2c_client(dev);
368	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
369	int flagreg;
370	u8 ctrl;
371	int err;
372
373	ctrl = rx8010->ctrlreg;
374
375	if (enabled) {
376	if (rx8010->rtc->uie_rtctimer.enabled)
377	ctrl \|= RX8010_CTRL_UIE;
378	if (rx8010->rtc->aie_timer.enabled)
379	ctrl \|= (RX8010_CTRL_AIE \| RX8010_CTRL_UIE);
380	} else {
381	if (!rx8010->rtc->uie_rtctimer.enabled)
382	ctrl &= ~RX8010_CTRL_UIE;
383	if (!rx8010->rtc->aie_timer.enabled)
384	ctrl &= ~RX8010_CTRL_AIE;
385	}
386
387	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
388	if (flagreg < 0)
389	return flagreg;
390
391	flagreg &= ~RX8010_FLAG_AF;
392	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
393	if (err < 0)
394	return err;
395
396	if (ctrl != rx8010->ctrlreg) {
397	rx8010->ctrlreg = ctrl;
398	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
399	rx8010->ctrlreg);
400	if (err < 0)
401	return err;
402	}
403
404	return 0;
405	}
406
407	static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
408	{
409	struct i2c_client *client = to_i2c_client(dev);
410	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
411	int ret, tmp;
412	int flagreg;
413	unsigned long irqflags;
414
415	switch (cmd) {
416	case RTC_VL_READ:
417	flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
418	if (flagreg < 0)
419	return flagreg;
420
421	tmp = !!(flagreg & RX8010_FLAG_VLF);
422	if (copy_to_user((void __user *)arg, &tmp, sizeof(int)))
423	return -EFAULT;
424
425	return 0;
426
427	case RTC_VL_CLR:
428	spin_lock_irqsave(&rx8010->flags_lock, irqflags);
429	flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
430	if (flagreg < 0) {
431	spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);
432	return flagreg;
433	}
434
435	flagreg &= ~RX8010_FLAG_VLF;
436	ret = i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg);
437	spin_unlock_irqrestore(&rx8010->flags_lock, irqflags);
438	if (ret < 0)
439	return ret;
440
441	return 0;
442
443	default:
444	return -ENOIOCTLCMD;
445	}
446	}
447
448	static struct rtc_class_ops rx8010_rtc_ops = {
449	.read_time = rx8010_get_time,
450	.set_time = rx8010_set_time,
451	.ioctl = rx8010_ioctl,
452	};
453
454	static int rx8010_probe(struct i2c_client *client,
455	const struct i2c_device_id *id)
456	{
457	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
458	struct rx8010_data *rx8010;
459	int err = 0;
460
461	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
462	\| I2C_FUNC_SMBUS_I2C_BLOCK)) {
463	dev_err(&adapter->dev, "doesn't support required functionality\n");
464	return -EIO;
465	}
466
467	rx8010 = devm_kzalloc(&client->dev, sizeof(struct rx8010_data),
468	GFP_KERNEL);
469	if (!rx8010)
470	return -ENOMEM;
471
472	rx8010->client = client;
473	i2c_set_clientdata(client, rx8010);
474
475	spin_lock_init(&rx8010->flags_lock);
476
477	err = rx8010_init_client(client);
478	if (err)
479	return err;
480
481	if (client->irq > 0) {
482	dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
483	err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
484	rx8010_irq_1_handler,
485	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
486	"rx8010", client);
487
488	if (err) {
489	dev_err(&client->dev, "unable to request IRQ\n");
490	client->irq = 0;
491	} else {
492	rx8010_rtc_ops.read_alarm = rx8010_read_alarm;
493	rx8010_rtc_ops.set_alarm = rx8010_set_alarm;
494	rx8010_rtc_ops.alarm_irq_enable = rx8010_alarm_irq_enable;
495	}
496	}
497
498	rx8010->rtc = devm_rtc_device_register(&client->dev, client->name,
499	&rx8010_rtc_ops, THIS_MODULE);
500
501	if (IS_ERR(rx8010->rtc)) {
502	dev_err(&client->dev, "unable to register the class device\n");
503	return PTR_ERR(rx8010->rtc);
504	}
505
506	rx8010->rtc->max_user_freq = 1;
507
508	return err;
509	}
510
511	static struct i2c_driver rx8010_driver = {
512	.driver = {
513	.name = "rtc-rx8010",
514	},
515	.probe = rx8010_probe,
516	.id_table = rx8010_id,
517	};
518
519	module_i2c_driver(rx8010_driver);
520
521	MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>");
522	MODULE_DESCRIPTION("Epson RX8010SJ RTC driver");
523	MODULE_LICENSE("GPL v2");