[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / rtc / rtc-rv3029c2.c

/*
 * Micro Crystal RV-3029C2 rtc class driver
 *
 * Author: Gregory Hermant <gregory.hermant@calao-systems.com>
 *
 * based on previously existing rtc class drivers
 *
 * 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.
 *
 * NOTE: Currently this driver only supports the bare minimum for read
 * and write the RTC and alarms. The extra features provided by this chip
 * (trickle charger, eeprom, T° compensation) are unavailable.
 */

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

/* Register map */
/* control section */
#define RV3029C2_ONOFF_CTRL		0x00
#define RV3029C2_IRQ_CTRL		0x01
#define RV3029C2_IRQ_CTRL_AIE		(1 << 0)
#define RV3029C2_IRQ_FLAGS		0x02
#define RV3029C2_IRQ_FLAGS_AF		(1 << 0)
#define RV3029C2_STATUS			0x03
#define RV3029C2_STATUS_VLOW1		(1 << 2)
#define RV3029C2_STATUS_VLOW2		(1 << 3)
#define RV3029C2_STATUS_SR		(1 << 4)
#define RV3029C2_STATUS_PON		(1 << 5)
#define RV3029C2_STATUS_EEBUSY		(1 << 7)
#define RV3029C2_RST_CTRL		0x04
#define RV3029C2_CONTROL_SECTION_LEN	0x05

/* watch section */
#define RV3029C2_W_SEC			0x08
#define RV3029C2_W_MINUTES		0x09
#define RV3029C2_W_HOURS		0x0A
#define RV3029C2_REG_HR_12_24		(1<<6)  /* 24h/12h mode */
#define RV3029C2_REG_HR_PM		(1<<5)  /* PM/AM bit in 12h mode */
#define RV3029C2_W_DATE			0x0B
#define RV3029C2_W_DAYS			0x0C
#define RV3029C2_W_MONTHS		0x0D
#define RV3029C2_W_YEARS		0x0E
#define RV3029C2_WATCH_SECTION_LEN	0x07

/* alarm section */
#define RV3029C2_A_SC			0x10
#define RV3029C2_A_MN			0x11
#define RV3029C2_A_HR			0x12
#define RV3029C2_A_DT			0x13
#define RV3029C2_A_DW			0x14
#define RV3029C2_A_MO			0x15
#define RV3029C2_A_YR			0x16
#define RV3029C2_ALARM_SECTION_LEN	0x07

/* timer section */
#define RV3029C2_TIMER_LOW		0x18
#define RV3029C2_TIMER_HIGH		0x19

/* temperature section */
#define RV3029C2_TEMP_PAGE		0x20

/* eeprom data section */
#define RV3029C2_E2P_EEDATA1		0x28
#define RV3029C2_E2P_EEDATA2		0x29

/* eeprom control section */
#define RV3029C2_CONTROL_E2P_EECTRL	0x30
#define RV3029C2_TRICKLE_1K		(1<<0)  /*  1K resistance */
#define RV3029C2_TRICKLE_5K		(1<<1)  /*  5K resistance */
#define RV3029C2_TRICKLE_20K		(1<<2)  /* 20K resistance */
#define RV3029C2_TRICKLE_80K		(1<<3)  /* 80K resistance */
#define RV3029C2_CONTROL_E2P_XTALOFFSET	0x31
#define RV3029C2_CONTROL_E2P_QCOEF	0x32
#define RV3029C2_CONTROL_E2P_TURNOVER	0x33

/* user ram section */
#define RV3029C2_USR1_RAM_PAGE		0x38
#define RV3029C2_USR1_SECTION_LEN	0x04
#define RV3029C2_USR2_RAM_PAGE		0x3C
#define RV3029C2_USR2_SECTION_LEN	0x04

static int
rv3029c2_i2c_read_regs(struct i2c_client *client, u8 reg, u8 *buf,
	unsigned len)
{
	int ret;

	if ((reg > RV3029C2_USR1_RAM_PAGE + 7) ||
		(reg + len > RV3029C2_USR1_RAM_PAGE + 8))
		return -EINVAL;

	ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf);
	if (ret < 0)
		return ret;
	if (ret < len)
		return -EIO;
	return 0;
}

static int
rv3029c2_i2c_write_regs(struct i2c_client *client, u8 reg, u8 const buf[],
			unsigned len)
{
	if ((reg > RV3029C2_USR1_RAM_PAGE + 7) ||
		(reg + len > RV3029C2_USR1_RAM_PAGE + 8))
		return -EINVAL;

	return i2c_smbus_write_i2c_block_data(client, reg, len, buf);
}

static int
rv3029c2_i2c_get_sr(struct i2c_client *client, u8 *buf)
{
	int ret = rv3029c2_i2c_read_regs(client, RV3029C2_STATUS, buf, 1);

	if (ret < 0)
		return -EIO;
	dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
	return 0;
}

static int
rv3029c2_i2c_set_sr(struct i2c_client *client, u8 val)
{
	u8 buf[1];
	int sr;

	buf[0] = val;
	sr = rv3029c2_i2c_write_regs(client, RV3029C2_STATUS, buf, 1);
	dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
	if (sr < 0)
		return -EIO;
	return 0;
}

static int
rv3029c2_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
{
	u8 buf[1];
	int ret;
	u8 regs[RV3029C2_WATCH_SECTION_LEN] = { 0, };

	ret = rv3029c2_i2c_get_sr(client, buf);
	if (ret < 0) {
		dev_err(&client->dev, "%s: reading SR failed\n", __func__);
		return -EIO;
	}

	ret = rv3029c2_i2c_read_regs(client, RV3029C2_W_SEC , regs,
					RV3029C2_WATCH_SECTION_LEN);
	if (ret < 0) {
		dev_err(&client->dev, "%s: reading RTC section failed\n",
			__func__);
		return ret;
	}

	tm->tm_sec = bcd2bin(regs[RV3029C2_W_SEC-RV3029C2_W_SEC]);
	tm->tm_min = bcd2bin(regs[RV3029C2_W_MINUTES-RV3029C2_W_SEC]);

	/* HR field has a more complex interpretation */
	{
		const u8 _hr = regs[RV3029C2_W_HOURS-RV3029C2_W_SEC];
		if (_hr & RV3029C2_REG_HR_12_24) {
			/* 12h format */
			tm->tm_hour = bcd2bin(_hr & 0x1f);
			if (_hr & RV3029C2_REG_HR_PM)	/* PM flag set */
				tm->tm_hour += 12;
		} else /* 24h format */
			tm->tm_hour = bcd2bin(_hr & 0x3f);
	}

	tm->tm_mday = bcd2bin(regs[RV3029C2_W_DATE-RV3029C2_W_SEC]);
	tm->tm_mon = bcd2bin(regs[RV3029C2_W_MONTHS-RV3029C2_W_SEC]) - 1;
	tm->tm_year = bcd2bin(regs[RV3029C2_W_YEARS-RV3029C2_W_SEC]) + 100;
	tm->tm_wday = bcd2bin(regs[RV3029C2_W_DAYS-RV3029C2_W_SEC]) - 1;

	return 0;
}

static int rv3029c2_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	return rv3029c2_i2c_read_time(to_i2c_client(dev), tm);
}

static int
rv3029c2_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
{
	struct rtc_time *const tm = &alarm->time;
	int ret;
	u8 regs[8];

	ret = rv3029c2_i2c_get_sr(client, regs);
	if (ret < 0) {
		dev_err(&client->dev, "%s: reading SR failed\n", __func__);
		return -EIO;
	}

	ret = rv3029c2_i2c_read_regs(client, RV3029C2_A_SC, regs,
					RV3029C2_ALARM_SECTION_LEN);

	if (ret < 0) {
		dev_err(&client->dev, "%s: reading alarm section failed\n",
			__func__);
		return ret;
	}

	tm->tm_sec = bcd2bin(regs[RV3029C2_A_SC-RV3029C2_A_SC] & 0x7f);
	tm->tm_min = bcd2bin(regs[RV3029C2_A_MN-RV3029C2_A_SC] & 0x7f);
	tm->tm_hour = bcd2bin(regs[RV3029C2_A_HR-RV3029C2_A_SC] & 0x3f);
	tm->tm_mday = bcd2bin(regs[RV3029C2_A_DT-RV3029C2_A_SC] & 0x3f);
	tm->tm_mon = bcd2bin(regs[RV3029C2_A_MO-RV3029C2_A_SC] & 0x1f) - 1;
	tm->tm_year = bcd2bin(regs[RV3029C2_A_YR-RV3029C2_A_SC] & 0x7f) + 100;
	tm->tm_wday = bcd2bin(regs[RV3029C2_A_DW-RV3029C2_A_SC] & 0x07) - 1;

	return 0;
}

static int
rv3029c2_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	return rv3029c2_i2c_read_alarm(to_i2c_client(dev), alarm);
}

static int rv3029c2_rtc_i2c_alarm_set_irq(struct i2c_client *client,
					int enable)
{
	int ret;
	u8 buf[1];

	/* enable AIE irq */
	ret = rv3029c2_i2c_read_regs(client, RV3029C2_IRQ_CTRL,	buf, 1);
	if (ret < 0) {
		dev_err(&client->dev, "can't read INT reg\n");
		return ret;
	}
	if (enable)
		buf[0] |= RV3029C2_IRQ_CTRL_AIE;
	else
		buf[0] &= ~RV3029C2_IRQ_CTRL_AIE;

	ret = rv3029c2_i2c_write_regs(client, RV3029C2_IRQ_CTRL, buf, 1);
	if (ret < 0) {
		dev_err(&client->dev, "can't set INT reg\n");
		return ret;
	}

	return 0;
}

static int rv3029c2_rtc_i2c_set_alarm(struct i2c_client *client,
					struct rtc_wkalrm *alarm)
{
	struct rtc_time *const tm = &alarm->time;
	int ret;
	u8 regs[8];

	/*
	 * The clock has an 8 bit wide bcd-coded register (they never learn)
	 * for the year. tm_year is an offset from 1900 and we are interested
	 * in the 2000-2099 range, so any value less than 100 is invalid.
	*/
	if (tm->tm_year < 100)
		return -EINVAL;

	ret = rv3029c2_i2c_get_sr(client, regs);
	if (ret < 0) {
		dev_err(&client->dev, "%s: reading SR failed\n", __func__);
		return -EIO;
	}
	regs[RV3029C2_A_SC-RV3029C2_A_SC] = bin2bcd(tm->tm_sec & 0x7f);
	regs[RV3029C2_A_MN-RV3029C2_A_SC] = bin2bcd(tm->tm_min & 0x7f);
	regs[RV3029C2_A_HR-RV3029C2_A_SC] = bin2bcd(tm->tm_hour & 0x3f);
	regs[RV3029C2_A_DT-RV3029C2_A_SC] = bin2bcd(tm->tm_mday & 0x3f);
	regs[RV3029C2_A_MO-RV3029C2_A_SC] = bin2bcd((tm->tm_mon & 0x1f) - 1);
	regs[RV3029C2_A_DW-RV3029C2_A_SC] = bin2bcd((tm->tm_wday & 7) - 1);
	regs[RV3029C2_A_YR-RV3029C2_A_SC] = bin2bcd((tm->tm_year & 0x7f) - 100);

	ret = rv3029c2_i2c_write_regs(client, RV3029C2_A_SC, regs,
					RV3029C2_ALARM_SECTION_LEN);
	if (ret < 0)
		return ret;

	if (alarm->enabled) {
		u8 buf[1];

		/* clear AF flag */
		ret = rv3029c2_i2c_read_regs(client, RV3029C2_IRQ_FLAGS,
						buf, 1);
		if (ret < 0) {
			dev_err(&client->dev, "can't read alarm flag\n");
			return ret;
		}
		buf[0] &= ~RV3029C2_IRQ_FLAGS_AF;
		ret = rv3029c2_i2c_write_regs(client, RV3029C2_IRQ_FLAGS,
						buf, 1);
		if (ret < 0) {
			dev_err(&client->dev, "can't set alarm flag\n");
			return ret;
		}
		/* enable AIE irq */
		ret = rv3029c2_rtc_i2c_alarm_set_irq(client, 1);
		if (ret)
			return ret;

		dev_dbg(&client->dev, "alarm IRQ armed\n");
	} else {
		/* disable AIE irq */
		ret = rv3029c2_rtc_i2c_alarm_set_irq(client, 0);
		if (ret)
			return ret;

		dev_dbg(&client->dev, "alarm IRQ disabled\n");
	}

	return 0;
}

static int rv3029c2_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	return rv3029c2_rtc_i2c_set_alarm(to_i2c_client(dev), alarm);
}

static int
rv3029c2_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
{
	u8 regs[8];
	int ret;

	/*
	 * The clock has an 8 bit wide bcd-coded register (they never learn)
	 * for the year. tm_year is an offset from 1900 and we are interested
	 * in the 2000-2099 range, so any value less than 100 is invalid.
	*/
	if (tm->tm_year < 100)
		return -EINVAL;

	regs[RV3029C2_W_SEC-RV3029C2_W_SEC] = bin2bcd(tm->tm_sec);
	regs[RV3029C2_W_MINUTES-RV3029C2_W_SEC] = bin2bcd(tm->tm_min);
	regs[RV3029C2_W_HOURS-RV3029C2_W_SEC] = bin2bcd(tm->tm_hour);
	regs[RV3029C2_W_DATE-RV3029C2_W_SEC] = bin2bcd(tm->tm_mday);
	regs[RV3029C2_W_MONTHS-RV3029C2_W_SEC] = bin2bcd(tm->tm_mon+1);
	regs[RV3029C2_W_DAYS-RV3029C2_W_SEC] = bin2bcd((tm->tm_wday & 7)+1);
	regs[RV3029C2_W_YEARS-RV3029C2_W_SEC] = bin2bcd(tm->tm_year - 100);

	ret = rv3029c2_i2c_write_regs(client, RV3029C2_W_SEC, regs,
					RV3029C2_WATCH_SECTION_LEN);
	if (ret < 0)
		return ret;

	ret = rv3029c2_i2c_get_sr(client, regs);
	if (ret < 0) {
		dev_err(&client->dev, "%s: reading SR failed\n", __func__);
		return ret;
	}
	/* clear PON bit */
	ret = rv3029c2_i2c_set_sr(client, (regs[0] & ~RV3029C2_STATUS_PON));
	if (ret < 0) {
		dev_err(&client->dev, "%s: reading SR failed\n", __func__);
		return ret;
	}

	return 0;
}

static int rv3029c2_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	return rv3029c2_i2c_set_time(to_i2c_client(dev), tm);
}

static const struct rtc_class_ops rv3029c2_rtc_ops = {
	.read_time	= rv3029c2_rtc_read_time,
	.set_time	= rv3029c2_rtc_set_time,
	.read_alarm	= rv3029c2_rtc_read_alarm,
	.set_alarm	= rv3029c2_rtc_set_alarm,
};

static struct i2c_device_id rv3029c2_id[] = {
	{ "rv3029c2", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, rv3029c2_id);

static int rv3029c2_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct rtc_device *rtc;
	int rc = 0;
	u8 buf[1];

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_EMUL))
		return -ENODEV;

	rtc = devm_rtc_device_register(&client->dev, client->name,
					&rv3029c2_rtc_ops, THIS_MODULE);

	if (IS_ERR(rtc))
		return PTR_ERR(rtc);

	i2c_set_clientdata(client, rtc);

	rc = rv3029c2_i2c_get_sr(client, buf);
	if (rc < 0) {
		dev_err(&client->dev, "reading status failed\n");
		return rc;
	}

	return 0;
}

static int rv3029c2_remove(struct i2c_client *client)
{
	return 0;
}

static struct i2c_driver rv3029c2_driver = {
	.driver = {
		.name = "rtc-rv3029c2",
	},
	.probe = rv3029c2_probe,
	.remove = rv3029c2_remove,
	.id_table = rv3029c2_id,
};

module_i2c_driver(rv3029c2_driver);

MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
MODULE_DESCRIPTION("Micro Crystal RV3029C2 RTC driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
52365230 HS	1	/*
	2	* Micro Crystal RV-3029C2 rtc class driver
	3	*
	4	* Author: Gregory Hermant <gregory.hermant@calao-systems.com>
	5	*
	6	* based on previously existing rtc class drivers
	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	* NOTE: Currently this driver only supports the bare minimum for read
	13	* and write the RTC and alarms. The extra features provided by this chip
	14	* (trickle charger, eeprom, T° compensation) are unavailable.
	15	*/
	16
	17	#include <linux/module.h>
	18	#include <linux/i2c.h>
	19	#include <linux/bcd.h>
	20	#include <linux/rtc.h>
	21
	22	/* Register map */
	23	/* control section */
	24	#define RV3029C2_ONOFF_CTRL 0x00
	25	#define RV3029C2_IRQ_CTRL 0x01
	26	#define RV3029C2_IRQ_CTRL_AIE (1 << 0)
	27	#define RV3029C2_IRQ_FLAGS 0x02
	28	#define RV3029C2_IRQ_FLAGS_AF (1 << 0)
	29	#define RV3029C2_STATUS 0x03
	30	#define RV3029C2_STATUS_VLOW1 (1 << 2)
	31	#define RV3029C2_STATUS_VLOW2 (1 << 3)
	32	#define RV3029C2_STATUS_SR (1 << 4)
	33	#define RV3029C2_STATUS_PON (1 << 5)
	34	#define RV3029C2_STATUS_EEBUSY (1 << 7)
	35	#define RV3029C2_RST_CTRL 0x04
	36	#define RV3029C2_CONTROL_SECTION_LEN 0x05
	37
	38	/* watch section */
	39	#define RV3029C2_W_SEC 0x08
	40	#define RV3029C2_W_MINUTES 0x09
	41	#define RV3029C2_W_HOURS 0x0A
	42	#define RV3029C2_REG_HR_12_24 (1<<6) /* 24h/12h mode */
	43	#define RV3029C2_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */
	44	#define RV3029C2_W_DATE 0x0B
	45	#define RV3029C2_W_DAYS 0x0C
	46	#define RV3029C2_W_MONTHS 0x0D
	47	#define RV3029C2_W_YEARS 0x0E
	48	#define RV3029C2_WATCH_SECTION_LEN 0x07
	49
	50	/* alarm section */
	51	#define RV3029C2_A_SC 0x10
	52	#define RV3029C2_A_MN 0x11
	53	#define RV3029C2_A_HR 0x12
	54	#define RV3029C2_A_DT 0x13
	55	#define RV3029C2_A_DW 0x14
	56	#define RV3029C2_A_MO 0x15
	57	#define RV3029C2_A_YR 0x16
	58	#define RV3029C2_ALARM_SECTION_LEN 0x07
	59
	60	/* timer section */
	61	#define RV3029C2_TIMER_LOW 0x18
	62	#define RV3029C2_TIMER_HIGH 0x19
	63
	64	/* temperature section */
65	#define RV3029C2_TEMP_PAGE 0x20
66
67	/* eeprom data section */
68	#define RV3029C2_E2P_EEDATA1 0x28
69	#define RV3029C2_E2P_EEDATA2 0x29
70
71	/* eeprom control section */
72	#define RV3029C2_CONTROL_E2P_EECTRL 0x30
73	#define RV3029C2_TRICKLE_1K (1<<0) /* 1K resistance */
74	#define RV3029C2_TRICKLE_5K (1<<1) /* 5K resistance */
75	#define RV3029C2_TRICKLE_20K (1<<2) /* 20K resistance */
76	#define RV3029C2_TRICKLE_80K (1<<3) /* 80K resistance */
77	#define RV3029C2_CONTROL_E2P_XTALOFFSET 0x31
78	#define RV3029C2_CONTROL_E2P_QCOEF 0x32
79	#define RV3029C2_CONTROL_E2P_TURNOVER 0x33
80
81	/* user ram section */
82	#define RV3029C2_USR1_RAM_PAGE 0x38
83	#define RV3029C2_USR1_SECTION_LEN 0x04
84	#define RV3029C2_USR2_RAM_PAGE 0x3C
85	#define RV3029C2_USR2_SECTION_LEN 0x04
86
87	static int
88	rv3029c2_i2c_read_regs(struct i2c_client client, u8 reg, u8 buf,
89	unsigned len)
90	{
91	int ret;
92
93	if ((reg > RV3029C2_USR1_RAM_PAGE + 7) \|\|
94	(reg + len > RV3029C2_USR1_RAM_PAGE + 8))
95	return -EINVAL;
96
97	ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf);
98	if (ret < 0)
99	return ret;
100	if (ret < len)
101	return -EIO;
102	return 0;
103	}
104
105	static int
106	rv3029c2_i2c_write_regs(struct i2c_client *client, u8 reg, u8 const buf[],
107	unsigned len)
108	{
109	if ((reg > RV3029C2_USR1_RAM_PAGE + 7) \|\|
110	(reg + len > RV3029C2_USR1_RAM_PAGE + 8))
111	return -EINVAL;
112
113	return i2c_smbus_write_i2c_block_data(client, reg, len, buf);
114	}
115
116	static int
117	rv3029c2_i2c_get_sr(struct i2c_client client, u8 buf)
118	{
119	int ret = rv3029c2_i2c_read_regs(client, RV3029C2_STATUS, buf, 1);
120
121	if (ret < 0)
122	return -EIO;
123	dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
124	return 0;
125	}
126
127	static int
128	rv3029c2_i2c_set_sr(struct i2c_client *client, u8 val)
129	{
130	u8 buf[1];
131	int sr;
132
133	buf[0] = val;
134	sr = rv3029c2_i2c_write_regs(client, RV3029C2_STATUS, buf, 1);
135	dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
136	if (sr < 0)
137	return -EIO;
138	return 0;
139	}
140
141	static int
142	rv3029c2_i2c_read_time(struct i2c_client client, struct rtc_time tm)
143	{
144	u8 buf[1];
145	int ret;
146	u8 regs[RV3029C2_WATCH_SECTION_LEN] = { 0, };
147
148	ret = rv3029c2_i2c_get_sr(client, buf);
149	if (ret < 0) {
150	dev_err(&client->dev, "%s: reading SR failed\n", __func__);
151	return -EIO;
152	}
153
154	ret = rv3029c2_i2c_read_regs(client, RV3029C2_W_SEC , regs,
155	RV3029C2_WATCH_SECTION_LEN);
156	if (ret < 0) {
157	dev_err(&client->dev, "%s: reading RTC section failed\n",
158	__func__);
159	return ret;
160	}
161
162	tm->tm_sec = bcd2bin(regs[RV3029C2_W_SEC-RV3029C2_W_SEC]);
163	tm->tm_min = bcd2bin(regs[RV3029C2_W_MINUTES-RV3029C2_W_SEC]);
164
165	/* HR field has a more complex interpretation */
166	{
167	const u8 _hr = regs[RV3029C2_W_HOURS-RV3029C2_W_SEC];
168	if (_hr & RV3029C2_REG_HR_12_24) {
169	/* 12h format */
170	tm->tm_hour = bcd2bin(_hr & 0x1f);
171	if (_hr & RV3029C2_REG_HR_PM) /* PM flag set */
172	tm->tm_hour += 12;
173	} else /* 24h format */
174	tm->tm_hour = bcd2bin(_hr & 0x3f);
175	}
176
177	tm->tm_mday = bcd2bin(regs[RV3029C2_W_DATE-RV3029C2_W_SEC]);
178	tm->tm_mon = bcd2bin(regs[RV3029C2_W_MONTHS-RV3029C2_W_SEC]) - 1;
179	tm->tm_year = bcd2bin(regs[RV3029C2_W_YEARS-RV3029C2_W_SEC]) + 100;
180	tm->tm_wday = bcd2bin(regs[RV3029C2_W_DAYS-RV3029C2_W_SEC]) - 1;
181
182	return 0;
183	}
184
185	static int rv3029c2_rtc_read_time(struct device dev, struct rtc_time tm)
186	{
187	return rv3029c2_i2c_read_time(to_i2c_client(dev), tm);
188	}
189
190	static int
191	rv3029c2_i2c_read_alarm(struct i2c_client client, struct rtc_wkalrm alarm)
192	{
193	struct rtc_time *const tm = &alarm->time;
194	int ret;
195	u8 regs[8];
196
197	ret = rv3029c2_i2c_get_sr(client, regs);
198	if (ret < 0) {
199	dev_err(&client->dev, "%s: reading SR failed\n", __func__);
200	return -EIO;
201	}
202
203	ret = rv3029c2_i2c_read_regs(client, RV3029C2_A_SC, regs,
204	RV3029C2_ALARM_SECTION_LEN);
205
206	if (ret < 0) {
207	dev_err(&client->dev, "%s: reading alarm section failed\n",
208	__func__);
209	return ret;
210	}
211
212	tm->tm_sec = bcd2bin(regs[RV3029C2_A_SC-RV3029C2_A_SC] & 0x7f);
213	tm->tm_min = bcd2bin(regs[RV3029C2_A_MN-RV3029C2_A_SC] & 0x7f);
214	tm->tm_hour = bcd2bin(regs[RV3029C2_A_HR-RV3029C2_A_SC] & 0x3f);
215	tm->tm_mday = bcd2bin(regs[RV3029C2_A_DT-RV3029C2_A_SC] & 0x3f);
216	tm->tm_mon = bcd2bin(regs[RV3029C2_A_MO-RV3029C2_A_SC] & 0x1f) - 1;
217	tm->tm_year = bcd2bin(regs[RV3029C2_A_YR-RV3029C2_A_SC] & 0x7f) + 100;
218	tm->tm_wday = bcd2bin(regs[RV3029C2_A_DW-RV3029C2_A_SC] & 0x07) - 1;
219
220	return 0;
221	}
222
223	static int
224	rv3029c2_rtc_read_alarm(struct device dev, struct rtc_wkalrm alarm)
225	{
226	return rv3029c2_i2c_read_alarm(to_i2c_client(dev), alarm);
227	}
228
229	static int rv3029c2_rtc_i2c_alarm_set_irq(struct i2c_client *client,
230	int enable)
231	{
232	int ret;
233	u8 buf[1];
234
235	/* enable AIE irq */
236	ret = rv3029c2_i2c_read_regs(client, RV3029C2_IRQ_CTRL, buf, 1);
237	if (ret < 0) {
238	dev_err(&client->dev, "can't read INT reg\n");
239	return ret;
240	}
241	if (enable)
242	buf[0] \|= RV3029C2_IRQ_CTRL_AIE;
243	else
244	buf[0] &= ~RV3029C2_IRQ_CTRL_AIE;
245
246	ret = rv3029c2_i2c_write_regs(client, RV3029C2_IRQ_CTRL, buf, 1);
247	if (ret < 0) {
248	dev_err(&client->dev, "can't set INT reg\n");
249	return ret;
250	}
251
252	return 0;
253	}
254
255	static int rv3029c2_rtc_i2c_set_alarm(struct i2c_client *client,
256	struct rtc_wkalrm *alarm)
257	{
258	struct rtc_time *const tm = &alarm->time;
259	int ret;
260	u8 regs[8];
261
262	/*
263	* The clock has an 8 bit wide bcd-coded register (they never learn)
264	* for the year. tm_year is an offset from 1900 and we are interested
265	* in the 2000-2099 range, so any value less than 100 is invalid.
266	*/
267	if (tm->tm_year < 100)
268	return -EINVAL;
269
270	ret = rv3029c2_i2c_get_sr(client, regs);
271	if (ret < 0) {
272	dev_err(&client->dev, "%s: reading SR failed\n", __func__);
273	return -EIO;
274	}
275	regs[RV3029C2_A_SC-RV3029C2_A_SC] = bin2bcd(tm->tm_sec & 0x7f);
276	regs[RV3029C2_A_MN-RV3029C2_A_SC] = bin2bcd(tm->tm_min & 0x7f);
277	regs[RV3029C2_A_HR-RV3029C2_A_SC] = bin2bcd(tm->tm_hour & 0x3f);
278	regs[RV3029C2_A_DT-RV3029C2_A_SC] = bin2bcd(tm->tm_mday & 0x3f);
279	regs[RV3029C2_A_MO-RV3029C2_A_SC] = bin2bcd((tm->tm_mon & 0x1f) - 1);
280	regs[RV3029C2_A_DW-RV3029C2_A_SC] = bin2bcd((tm->tm_wday & 7) - 1);
281	regs[RV3029C2_A_YR-RV3029C2_A_SC] = bin2bcd((tm->tm_year & 0x7f) - 100);
282
283	ret = rv3029c2_i2c_write_regs(client, RV3029C2_A_SC, regs,
284	RV3029C2_ALARM_SECTION_LEN);
285	if (ret < 0)
286	return ret;
287
288	if (alarm->enabled) {
289	u8 buf[1];
290
291	/* clear AF flag */
292	ret = rv3029c2_i2c_read_regs(client, RV3029C2_IRQ_FLAGS,
293	buf, 1);
294	if (ret < 0) {
295	dev_err(&client->dev, "can't read alarm flag\n");
296	return ret;
297	}
298	buf[0] &= ~RV3029C2_IRQ_FLAGS_AF;
299	ret = rv3029c2_i2c_write_regs(client, RV3029C2_IRQ_FLAGS,
300	buf, 1);
301	if (ret < 0) {
302	dev_err(&client->dev, "can't set alarm flag\n");
303	return ret;
304	}
305	/* enable AIE irq */
306	ret = rv3029c2_rtc_i2c_alarm_set_irq(client, 1);
307	if (ret)
308	return ret;
309
310	dev_dbg(&client->dev, "alarm IRQ armed\n");
311	} else {
312	/* disable AIE irq */
e64c0641	313	ret = rv3029c2_rtc_i2c_alarm_set_irq(client, 0);
52365230 HS	314	if (ret)
	315	return ret;
	316
	317	dev_dbg(&client->dev, "alarm IRQ disabled\n");
	318	}
	319
	320	return 0;
	321	}
	322
	323	static int rv3029c2_rtc_set_alarm(struct device dev, struct rtc_wkalrm alarm)
	324	{
	325	return rv3029c2_rtc_i2c_set_alarm(to_i2c_client(dev), alarm);
	326	}
	327
	328	static int
	329	rv3029c2_i2c_set_time(struct i2c_client client, struct rtc_time const tm)
	330	{
	331	u8 regs[8];
	332	int ret;
	333
	334	/*
	335	* The clock has an 8 bit wide bcd-coded register (they never learn)
	336	* for the year. tm_year is an offset from 1900 and we are interested
	337	* in the 2000-2099 range, so any value less than 100 is invalid.
	338	*/
	339	if (tm->tm_year < 100)
	340	return -EINVAL;
	341
	342	regs[RV3029C2_W_SEC-RV3029C2_W_SEC] = bin2bcd(tm->tm_sec);
	343	regs[RV3029C2_W_MINUTES-RV3029C2_W_SEC] = bin2bcd(tm->tm_min);
	344	regs[RV3029C2_W_HOURS-RV3029C2_W_SEC] = bin2bcd(tm->tm_hour);
	345	regs[RV3029C2_W_DATE-RV3029C2_W_SEC] = bin2bcd(tm->tm_mday);
	346	regs[RV3029C2_W_MONTHS-RV3029C2_W_SEC] = bin2bcd(tm->tm_mon+1);
	347	regs[RV3029C2_W_DAYS-RV3029C2_W_SEC] = bin2bcd((tm->tm_wday & 7)+1);
	348	regs[RV3029C2_W_YEARS-RV3029C2_W_SEC] = bin2bcd(tm->tm_year - 100);
	349
	350	ret = rv3029c2_i2c_write_regs(client, RV3029C2_W_SEC, regs,
	351	RV3029C2_WATCH_SECTION_LEN);
	352	if (ret < 0)
	353	return ret;
	354
	355	ret = rv3029c2_i2c_get_sr(client, regs);
	356	if (ret < 0) {
	357	dev_err(&client->dev, "%s: reading SR failed\n", __func__);
	358	return ret;
	359	}
	360	/* clear PON bit */
	361	ret = rv3029c2_i2c_set_sr(client, (regs[0] & ~RV3029C2_STATUS_PON));
	362	if (ret < 0) {
	363	dev_err(&client->dev, "%s: reading SR failed\n", __func__);
	364	return ret;
	365	}
	366
	367	return 0;
	368	}
	369
	370	static int rv3029c2_rtc_set_time(struct device dev, struct rtc_time tm)
	371	{
	372	return rv3029c2_i2c_set_time(to_i2c_client(dev), tm);
	373	}
	374
	375	static const struct rtc_class_ops rv3029c2_rtc_ops = {
	376	.read_time = rv3029c2_rtc_read_time,
	377	.set_time = rv3029c2_rtc_set_time,
378	.read_alarm = rv3029c2_rtc_read_alarm,
379	.set_alarm = rv3029c2_rtc_set_alarm,
380	};
381
382	static struct i2c_device_id rv3029c2_id[] = {
383	{ "rv3029c2", 0 },
384	{ }
385	};
386	MODULE_DEVICE_TABLE(i2c, rv3029c2_id);
387
5a167f45 GKH	388	static int rv3029c2_probe(struct i2c_client *client,
5a167f45 GKH	389	const struct i2c_device_id *id)
52365230 HS	390	{
	391	struct rtc_device *rtc;
	392	int rc = 0;
	393	u8 buf[1];
	394
	395	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_EMUL))
	396	return -ENODEV;
	397
3d7068c9 JH	398	rtc = devm_rtc_device_register(&client->dev, client->name,
3d7068c9 JH	399	&rv3029c2_rtc_ops, THIS_MODULE);
52365230 HS	400
	401	if (IS_ERR(rtc))
	402	return PTR_ERR(rtc);
	403
	404	i2c_set_clientdata(client, rtc);
	405
	406	rc = rv3029c2_i2c_get_sr(client, buf);
	407	if (rc < 0) {
	408	dev_err(&client->dev, "reading status failed\n");
3d7068c9	409	return rc;
52365230 HS	410	}
	411
	412	return 0;
52365230 HS	413	}
52365230 HS	414
5a167f45	415	static int rv3029c2_remove(struct i2c_client *client)
52365230	416	{
52365230 HS	417	return 0;
	418	}
	419
	420	static struct i2c_driver rv3029c2_driver = {
	421	.driver = {
	422	.name = "rtc-rv3029c2",
	423	},
	424	.probe = rv3029c2_probe,
5a167f45	425	.remove = rv3029c2_remove,
52365230 HS	426	.id_table = rv3029c2_id,
	427	};
	428
0abc9201	429	module_i2c_driver(rv3029c2_driver);
52365230 HS	430
	431	MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
	432	MODULE_DESCRIPTION("Micro Crystal RV3029C2 RTC driver");
	433	MODULE_LICENSE("GPL");