[linux-2.6-block.git] / drivers / rtc / rtc-rk808.c

/*
 * RTC driver for Rockchip RK808
 *
 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
 *
 * Author: Chris Zhong <zyw@rock-chips.com>
 * Author: Zhang Qing <zhangqing@rock-chips.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/mfd/rk808.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>

/* RTC_CTRL_REG bitfields */
#define BIT_RTC_CTRL_REG_STOP_RTC_M		BIT(0)

/* RK808 has a shadowed register for saving a "frozen" RTC time.
 * When user setting "GET_TIME" to 1, the time will save in this shadowed
 * register. If set "READSEL" to 1, user read rtc time register, actually
 * get the time of that moment. If we need the real time, clr this bit.
 */
#define BIT_RTC_CTRL_REG_RTC_GET_TIME		BIT(6)
#define BIT_RTC_CTRL_REG_RTC_READSEL_M		BIT(7)
#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M	BIT(3)
#define RTC_STATUS_MASK		0xFE

#define SECONDS_REG_MSK		0x7F
#define MINUTES_REG_MAK		0x7F
#define HOURS_REG_MSK		0x3F
#define DAYS_REG_MSK		0x3F
#define MONTHS_REG_MSK		0x1F
#define YEARS_REG_MSK		0xFF
#define WEEKS_REG_MSK		0x7

/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */

#define NUM_TIME_REGS	(RK808_WEEKS_REG - RK808_SECONDS_REG + 1)
#define NUM_ALARM_REGS	(RK808_ALARM_YEARS_REG - RK808_ALARM_SECONDS_REG + 1)

struct rk808_rtc {
	struct rk808 *rk808;
	struct rtc_device *rtc;
	int irq;
};

/* Read current time and date in RTC */
static int rk808_rtc_readtime(struct device *dev, struct rtc_time *tm)
{
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	struct rk808 *rk808 = rk808_rtc->rk808;
	u8 rtc_data[NUM_TIME_REGS];
	int ret;

	/* Force an update of the shadowed registers right now */
	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
				 BIT_RTC_CTRL_REG_RTC_GET_TIME,
				 BIT_RTC_CTRL_REG_RTC_GET_TIME);
	if (ret) {
		dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret);
		return ret;
	}

	/*
	 * After we set the GET_TIME bit, the rtc time can't be read
	 * immediately. So we should wait up to 31.25 us, about one cycle of
	 * 32khz. If we clear the GET_TIME bit here, the time of i2c transfer
	 * certainly more than 31.25us: 16 * 2.5us at 400kHz bus frequency.
	 */
	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
				 BIT_RTC_CTRL_REG_RTC_GET_TIME,
				 0);
	if (ret) {
		dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret);
		return ret;
	}

	ret = regmap_bulk_read(rk808->regmap, RK808_SECONDS_REG,
			       rtc_data, NUM_TIME_REGS);
	if (ret) {
		dev_err(dev, "Failed to bulk read rtc_data: %d\n", ret);
		return ret;
	}

	tm->tm_sec = bcd2bin(rtc_data[0] & SECONDS_REG_MSK);
	tm->tm_min = bcd2bin(rtc_data[1] & MINUTES_REG_MAK);
	tm->tm_hour = bcd2bin(rtc_data[2] & HOURS_REG_MSK);
	tm->tm_mday = bcd2bin(rtc_data[3] & DAYS_REG_MSK);
	tm->tm_mon = (bcd2bin(rtc_data[4] & MONTHS_REG_MSK)) - 1;
	tm->tm_year = (bcd2bin(rtc_data[5] & YEARS_REG_MSK)) + 100;
	tm->tm_wday = bcd2bin(rtc_data[6] & WEEKS_REG_MSK);
	dev_dbg(dev, "RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
		1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
		tm->tm_wday, tm->tm_hour , tm->tm_min, tm->tm_sec);

	return ret;
}

/* Set current time and date in RTC */
static int rk808_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	struct rk808 *rk808 = rk808_rtc->rk808;
	u8 rtc_data[NUM_TIME_REGS];
	int ret;

	rtc_data[0] = bin2bcd(tm->tm_sec);
	rtc_data[1] = bin2bcd(tm->tm_min);
	rtc_data[2] = bin2bcd(tm->tm_hour);
	rtc_data[3] = bin2bcd(tm->tm_mday);
	rtc_data[4] = bin2bcd(tm->tm_mon + 1);
	rtc_data[5] = bin2bcd(tm->tm_year - 100);
	rtc_data[6] = bin2bcd(tm->tm_wday);
	dev_dbg(dev, "set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
		1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
		tm->tm_wday, tm->tm_hour , tm->tm_min, tm->tm_sec);

	/* Stop RTC while updating the RTC registers */
	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
				 BIT_RTC_CTRL_REG_STOP_RTC_M,
				 BIT_RTC_CTRL_REG_STOP_RTC_M);
	if (ret) {
		dev_err(dev, "Failed to update RTC control: %d\n", ret);
		return ret;
	}

	ret = regmap_bulk_write(rk808->regmap, RK808_SECONDS_REG,
				rtc_data, NUM_TIME_REGS);
	if (ret) {
		dev_err(dev, "Failed to bull write rtc_data: %d\n", ret);
		return ret;
	}
	/* Start RTC again */
	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
				 BIT_RTC_CTRL_REG_STOP_RTC_M, 0);
	if (ret) {
		dev_err(dev, "Failed to update RTC control: %d\n", ret);
		return ret;
	}
	return 0;
}

/* Read alarm time and date in RTC */
static int rk808_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	struct rk808 *rk808 = rk808_rtc->rk808;
	u8 alrm_data[NUM_ALARM_REGS];
	uint32_t int_reg;
	int ret;

	ret = regmap_bulk_read(rk808->regmap, RK808_ALARM_SECONDS_REG,
			       alrm_data, NUM_ALARM_REGS);

	alrm->time.tm_sec = bcd2bin(alrm_data[0] & SECONDS_REG_MSK);
	alrm->time.tm_min = bcd2bin(alrm_data[1] & MINUTES_REG_MAK);
	alrm->time.tm_hour = bcd2bin(alrm_data[2] & HOURS_REG_MSK);
	alrm->time.tm_mday = bcd2bin(alrm_data[3] & DAYS_REG_MSK);
	alrm->time.tm_mon = (bcd2bin(alrm_data[4] & MONTHS_REG_MSK)) - 1;
	alrm->time.tm_year = (bcd2bin(alrm_data[5] & YEARS_REG_MSK)) + 100;

	ret = regmap_read(rk808->regmap, RK808_RTC_INT_REG, &int_reg);
	if (ret) {
		dev_err(dev, "Failed to read RTC INT REG: %d\n", ret);
		return ret;
	}

	dev_dbg(dev, "alrm read RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
		1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
		alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
		alrm->time.tm_min, alrm->time.tm_sec);

	alrm->enabled = (int_reg & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M) ? 1 : 0;

	return 0;
}

static int rk808_rtc_stop_alarm(struct rk808_rtc *rk808_rtc)
{
	struct rk808 *rk808 = rk808_rtc->rk808;
	int ret;

	ret = regmap_update_bits(rk808->regmap, RK808_RTC_INT_REG,
				 BIT_RTC_INTERRUPTS_REG_IT_ALARM_M, 0);

	return ret;
}

static int rk808_rtc_start_alarm(struct rk808_rtc *rk808_rtc)
{
	struct rk808 *rk808 = rk808_rtc->rk808;
	int ret;

	ret = regmap_update_bits(rk808->regmap, RK808_RTC_INT_REG,
				 BIT_RTC_INTERRUPTS_REG_IT_ALARM_M,
				 BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);

	return ret;
}

static int rk808_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	struct rk808 *rk808 = rk808_rtc->rk808;
	u8 alrm_data[NUM_ALARM_REGS];
	int ret;

	ret = rk808_rtc_stop_alarm(rk808_rtc);
	if (ret) {
		dev_err(dev, "Failed to stop alarm: %d\n", ret);
		return ret;
	}
	dev_dbg(dev, "alrm set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
		1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
		alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
		alrm->time.tm_min, alrm->time.tm_sec);

	alrm_data[0] = bin2bcd(alrm->time.tm_sec);
	alrm_data[1] = bin2bcd(alrm->time.tm_min);
	alrm_data[2] = bin2bcd(alrm->time.tm_hour);
	alrm_data[3] = bin2bcd(alrm->time.tm_mday);
	alrm_data[4] = bin2bcd(alrm->time.tm_mon + 1);
	alrm_data[5] = bin2bcd(alrm->time.tm_year - 100);

	ret = regmap_bulk_write(rk808->regmap, RK808_ALARM_SECONDS_REG,
				alrm_data, NUM_ALARM_REGS);
	if (ret) {
		dev_err(dev, "Failed to bulk write: %d\n", ret);
		return ret;
	}
	if (alrm->enabled) {
		ret = rk808_rtc_start_alarm(rk808_rtc);
		if (ret) {
			dev_err(dev, "Failed to start alarm: %d\n", ret);
			return ret;
		}
	}
	return 0;
}

static int rk808_rtc_alarm_irq_enable(struct device *dev,
				      unsigned int enabled)
{
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);

	if (enabled)
		return rk808_rtc_start_alarm(rk808_rtc);

	return rk808_rtc_stop_alarm(rk808_rtc);
}

/*
 * We will just handle setting the frequency and make use the framework for
 * reading the periodic interupts.
 *
 * @freq: Current periodic IRQ freq:
 * bit 0: every second
 * bit 1: every minute
 * bit 2: every hour
 * bit 3: every day
 */
static irqreturn_t rk808_alarm_irq(int irq, void *data)
{
	struct rk808_rtc *rk808_rtc = data;
	struct rk808 *rk808 = rk808_rtc->rk808;
	struct i2c_client *client = rk808->i2c;
	int ret;

	ret = regmap_write(rk808->regmap, RK808_RTC_STATUS_REG,
			   RTC_STATUS_MASK);
	if (ret) {
		dev_err(&client->dev,
			"%s:Failed to update RTC status: %d\n", __func__, ret);
		return ret;
	}

	rtc_update_irq(rk808_rtc->rtc, 1, RTC_IRQF | RTC_AF);
	dev_dbg(&client->dev,
		 "%s:irq=%d\n", __func__, irq);
	return IRQ_HANDLED;
}

static const struct rtc_class_ops rk808_rtc_ops = {
	.read_time = rk808_rtc_readtime,
	.set_time = rk808_rtc_set_time,
	.read_alarm = rk808_rtc_readalarm,
	.set_alarm = rk808_rtc_setalarm,
	.alarm_irq_enable = rk808_rtc_alarm_irq_enable,
};

#ifdef CONFIG_PM_SLEEP
/* Turn off the alarm if it should not be a wake source. */
static int rk808_rtc_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(rk808_rtc->irq);

	return 0;
}

/* Enable the alarm if it should be enabled (in case it was disabled to
 * prevent use as a wake source).
 */
static int rk808_rtc_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(rk808_rtc->irq);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(rk808_rtc_pm_ops,
	rk808_rtc_suspend, rk808_rtc_resume);

static int rk808_rtc_probe(struct platform_device *pdev)
{
	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
	struct rk808_rtc *rk808_rtc;
	struct rtc_time tm;
	int ret;

	rk808_rtc = devm_kzalloc(&pdev->dev, sizeof(*rk808_rtc), GFP_KERNEL);
	if (rk808_rtc == NULL)
		return -ENOMEM;

	platform_set_drvdata(pdev, rk808_rtc);
	rk808_rtc->rk808 = rk808;

	/* start rtc running by default, and use shadowed timer. */
	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
				 BIT_RTC_CTRL_REG_STOP_RTC_M |
				 BIT_RTC_CTRL_REG_RTC_READSEL_M,
				 BIT_RTC_CTRL_REG_RTC_READSEL_M);
	if (ret) {
		dev_err(&pdev->dev,
			"Failed to update RTC control: %d\n", ret);
		return ret;
	}

	ret = regmap_write(rk808->regmap, RK808_RTC_STATUS_REG,
			   RTC_STATUS_MASK);
	if (ret) {
		dev_err(&pdev->dev,
			"Failed to write RTC status: %d\n", ret);
			return ret;
	}

	/* set init time */
	ret = rk808_rtc_readtime(&pdev->dev, &tm);
	if (ret) {
		dev_err(&pdev->dev, "Failed to read RTC time\n");
		return ret;
	}
	ret = rtc_valid_tm(&tm);
	if (ret)
		dev_warn(&pdev->dev, "invalid date/time\n");

	device_init_wakeup(&pdev->dev, 1);

	rk808_rtc->rtc = devm_rtc_device_register(&pdev->dev, "rk808-rtc",
						  &rk808_rtc_ops, THIS_MODULE);
	if (IS_ERR(rk808_rtc->rtc)) {
		ret = PTR_ERR(rk808_rtc->rtc);
		return ret;
	}

	rk808_rtc->irq = platform_get_irq(pdev, 0);
	if (rk808_rtc->irq < 0) {
		if (rk808_rtc->irq != -EPROBE_DEFER)
			dev_err(&pdev->dev, "Wake up is not possible as irq = %d\n",
				rk808_rtc->irq);
		return rk808_rtc->irq;
	}

	/* request alarm irq of rk808 */
	ret = devm_request_threaded_irq(&pdev->dev, rk808_rtc->irq, NULL,
					rk808_alarm_irq, 0,
					"RTC alarm", rk808_rtc);
	if (ret) {
		dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
			rk808_rtc->irq, ret);
	}

	return ret;
}

static struct platform_driver rk808_rtc_driver = {
	.probe = rk808_rtc_probe,
	.driver = {
		.name = "rk808-rtc",
		.pm = &rk808_rtc_pm_ops,
	},
};

module_platform_driver(rk808_rtc_driver);

MODULE_DESCRIPTION("RTC driver for the rk808 series PMICs");
MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rk808-rtc");
Commit	Line	Data
3ca1e326 CZ	1	/*
	2	* RTC driver for Rockchip RK808
	3	*
	4	* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
	5	*
	6	* Author: Chris Zhong <zyw@rock-chips.com>
	7	* Author: Zhang Qing <zhangqing@rock-chips.com>
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms and conditions of the GNU General Public License,
	11	* version 2, as published by the Free Software Foundation.
	12	*
	13	* This program is distributed in the hope it will be useful, but WITHOUT
	14	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	15	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	16	* more details.
	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/kernel.h>
	21	#include <linux/rtc.h>
	22	#include <linux/bcd.h>
	23	#include <linux/mfd/rk808.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/i2c.h>
	26
	27	/* RTC_CTRL_REG bitfields */
	28	#define BIT_RTC_CTRL_REG_STOP_RTC_M BIT(0)
	29
	30	/* RK808 has a shadowed register for saving a "frozen" RTC time.
	31	* When user setting "GET_TIME" to 1, the time will save in this shadowed
	32	* register. If set "READSEL" to 1, user read rtc time register, actually
	33	* get the time of that moment. If we need the real time, clr this bit.
	34	*/
	35	#define BIT_RTC_CTRL_REG_RTC_GET_TIME BIT(6)
	36	#define BIT_RTC_CTRL_REG_RTC_READSEL_M BIT(7)
	37	#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M BIT(3)
	38	#define RTC_STATUS_MASK 0xFE
	39
	40	#define SECONDS_REG_MSK 0x7F
	41	#define MINUTES_REG_MAK 0x7F
	42	#define HOURS_REG_MSK 0x3F
	43	#define DAYS_REG_MSK 0x3F
	44	#define MONTHS_REG_MSK 0x1F
	45	#define YEARS_REG_MSK 0xFF
	46	#define WEEKS_REG_MSK 0x7
	47
	48	/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
	49
	50	#define NUM_TIME_REGS (RK808_WEEKS_REG - RK808_SECONDS_REG + 1)
	51	#define NUM_ALARM_REGS (RK808_ALARM_YEARS_REG - RK808_ALARM_SECONDS_REG + 1)
	52
	53	struct rk808_rtc {
	54	struct rk808 *rk808;
	55	struct rtc_device *rtc;
	56	int irq;
	57	};
	58
	59	/* Read current time and date in RTC */
	60	static int rk808_rtc_readtime(struct device dev, struct rtc_time tm)
	61	{
	62	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	63	struct rk808 *rk808 = rk808_rtc->rk808;
	64	u8 rtc_data[NUM_TIME_REGS];
65	int ret;
66
67	/* Force an update of the shadowed registers right now */
68	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
69	BIT_RTC_CTRL_REG_RTC_GET_TIME,
c412c603	70	BIT_RTC_CTRL_REG_RTC_GET_TIME);
3ca1e326 CZ	71	if (ret) {
	72	dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret);
	73	return ret;
	74	}
	75
c412c603 CZ	76	/*
	77	* After we set the GET_TIME bit, the rtc time can't be read
	78	* immediately. So we should wait up to 31.25 us, about one cycle of
	79	* 32khz. If we clear the GET_TIME bit here, the time of i2c transfer
	80	* certainly more than 31.25us: 16 * 2.5us at 400kHz bus frequency.
	81	*/
3ca1e326 CZ	82	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
3ca1e326 CZ	83	BIT_RTC_CTRL_REG_RTC_GET_TIME,
c412c603	84	0);
3ca1e326 CZ	85	if (ret) {
	86	dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret);
	87	return ret;
	88	}
	89
	90	ret = regmap_bulk_read(rk808->regmap, RK808_SECONDS_REG,
	91	rtc_data, NUM_TIME_REGS);
	92	if (ret) {
	93	dev_err(dev, "Failed to bulk read rtc_data: %d\n", ret);
	94	return ret;
	95	}
	96
	97	tm->tm_sec = bcd2bin(rtc_data[0] & SECONDS_REG_MSK);
	98	tm->tm_min = bcd2bin(rtc_data[1] & MINUTES_REG_MAK);
	99	tm->tm_hour = bcd2bin(rtc_data[2] & HOURS_REG_MSK);
	100	tm->tm_mday = bcd2bin(rtc_data[3] & DAYS_REG_MSK);
	101	tm->tm_mon = (bcd2bin(rtc_data[4] & MONTHS_REG_MSK)) - 1;
	102	tm->tm_year = (bcd2bin(rtc_data[5] & YEARS_REG_MSK)) + 100;
	103	tm->tm_wday = bcd2bin(rtc_data[6] & WEEKS_REG_MSK);
	104	dev_dbg(dev, "RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
	105	1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
	106	tm->tm_wday, tm->tm_hour , tm->tm_min, tm->tm_sec);
	107
	108	return ret;
	109	}
	110
	111	/* Set current time and date in RTC */
	112	static int rk808_rtc_set_time(struct device dev, struct rtc_time tm)
	113	{
	114	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	115	struct rk808 *rk808 = rk808_rtc->rk808;
	116	u8 rtc_data[NUM_TIME_REGS];
	117	int ret;
	118
	119	rtc_data[0] = bin2bcd(tm->tm_sec);
	120	rtc_data[1] = bin2bcd(tm->tm_min);
	121	rtc_data[2] = bin2bcd(tm->tm_hour);
	122	rtc_data[3] = bin2bcd(tm->tm_mday);
	123	rtc_data[4] = bin2bcd(tm->tm_mon + 1);
	124	rtc_data[5] = bin2bcd(tm->tm_year - 100);
	125	rtc_data[6] = bin2bcd(tm->tm_wday);
	126	dev_dbg(dev, "set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
	127	1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
	128	tm->tm_wday, tm->tm_hour , tm->tm_min, tm->tm_sec);
	129
	130	/* Stop RTC while updating the RTC registers */
	131	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
	132	BIT_RTC_CTRL_REG_STOP_RTC_M,
	133	BIT_RTC_CTRL_REG_STOP_RTC_M);
	134	if (ret) {
	135	dev_err(dev, "Failed to update RTC control: %d\n", ret);
	136	return ret;
	137	}
	138
	139	ret = regmap_bulk_write(rk808->regmap, RK808_SECONDS_REG,
	140	rtc_data, NUM_TIME_REGS);
	141	if (ret) {
	142	dev_err(dev, "Failed to bull write rtc_data: %d\n", ret);
	143	return ret;
	144	}
	145	/* Start RTC again */
	146	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
	147	BIT_RTC_CTRL_REG_STOP_RTC_M, 0);
	148	if (ret) {
149	dev_err(dev, "Failed to update RTC control: %d\n", ret);
150	return ret;
151	}
152	return 0;
153	}
154
155	/* Read alarm time and date in RTC */
156	static int rk808_rtc_readalarm(struct device dev, struct rtc_wkalrm alrm)
157	{
158	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
159	struct rk808 *rk808 = rk808_rtc->rk808;
160	u8 alrm_data[NUM_ALARM_REGS];
161	uint32_t int_reg;
162	int ret;
163
164	ret = regmap_bulk_read(rk808->regmap, RK808_ALARM_SECONDS_REG,
165	alrm_data, NUM_ALARM_REGS);
166
167	alrm->time.tm_sec = bcd2bin(alrm_data[0] & SECONDS_REG_MSK);
168	alrm->time.tm_min = bcd2bin(alrm_data[1] & MINUTES_REG_MAK);
169	alrm->time.tm_hour = bcd2bin(alrm_data[2] & HOURS_REG_MSK);
170	alrm->time.tm_mday = bcd2bin(alrm_data[3] & DAYS_REG_MSK);
171	alrm->time.tm_mon = (bcd2bin(alrm_data[4] & MONTHS_REG_MSK)) - 1;
172	alrm->time.tm_year = (bcd2bin(alrm_data[5] & YEARS_REG_MSK)) + 100;
173
174	ret = regmap_read(rk808->regmap, RK808_RTC_INT_REG, &int_reg);
175	if (ret) {
176	dev_err(dev, "Failed to read RTC INT REG: %d\n", ret);
177	return ret;
178	}
179
180	dev_dbg(dev, "alrm read RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
181	1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
182	alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
183	alrm->time.tm_min, alrm->time.tm_sec);
184
185	alrm->enabled = (int_reg & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M) ? 1 : 0;
186
187	return 0;
188	}
189
190	static int rk808_rtc_stop_alarm(struct rk808_rtc *rk808_rtc)
191	{
192	struct rk808 *rk808 = rk808_rtc->rk808;
193	int ret;
194
195	ret = regmap_update_bits(rk808->regmap, RK808_RTC_INT_REG,
196	BIT_RTC_INTERRUPTS_REG_IT_ALARM_M, 0);
197
198	return ret;
199	}
200
201	static int rk808_rtc_start_alarm(struct rk808_rtc *rk808_rtc)
202	{
203	struct rk808 *rk808 = rk808_rtc->rk808;
204	int ret;
205
206	ret = regmap_update_bits(rk808->regmap, RK808_RTC_INT_REG,
207	BIT_RTC_INTERRUPTS_REG_IT_ALARM_M,
208	BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
209
210	return ret;
211	}
212
213	static int rk808_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
214	{
215	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
216	struct rk808 *rk808 = rk808_rtc->rk808;
217	u8 alrm_data[NUM_ALARM_REGS];
218	int ret;
219
220	ret = rk808_rtc_stop_alarm(rk808_rtc);
221	if (ret) {
222	dev_err(dev, "Failed to stop alarm: %d\n", ret);
223	return ret;
224	}
225	dev_dbg(dev, "alrm set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
226	1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
227	alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
228	alrm->time.tm_min, alrm->time.tm_sec);
229
230	alrm_data[0] = bin2bcd(alrm->time.tm_sec);
231	alrm_data[1] = bin2bcd(alrm->time.tm_min);
232	alrm_data[2] = bin2bcd(alrm->time.tm_hour);
233	alrm_data[3] = bin2bcd(alrm->time.tm_mday);
234	alrm_data[4] = bin2bcd(alrm->time.tm_mon + 1);
235	alrm_data[5] = bin2bcd(alrm->time.tm_year - 100);
236
237	ret = regmap_bulk_write(rk808->regmap, RK808_ALARM_SECONDS_REG,
238	alrm_data, NUM_ALARM_REGS);
239	if (ret) {
240	dev_err(dev, "Failed to bulk write: %d\n", ret);
241	return ret;
242	}
243	if (alrm->enabled) {
244	ret = rk808_rtc_start_alarm(rk808_rtc);
245	if (ret) {
246	dev_err(dev, "Failed to start alarm: %d\n", ret);
247	return ret;
248	}
249	}
250	return 0;
251	}
252
253	static int rk808_rtc_alarm_irq_enable(struct device *dev,
254	unsigned int enabled)
255	{
256	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
257
258	if (enabled)
259	return rk808_rtc_start_alarm(rk808_rtc);
260
261	return rk808_rtc_stop_alarm(rk808_rtc);
262	}
263
264	/*
265	* We will just handle setting the frequency and make use the framework for
266	* reading the periodic interupts.
267	*
268	* @freq: Current periodic IRQ freq:
269	* bit 0: every second
270	* bit 1: every minute
271	* bit 2: every hour
272	* bit 3: every day
273	*/
274	static irqreturn_t rk808_alarm_irq(int irq, void *data)
275	{
276	struct rk808_rtc *rk808_rtc = data;
277	struct rk808 *rk808 = rk808_rtc->rk808;
278	struct i2c_client *client = rk808->i2c;
279	int ret;
280
281	ret = regmap_write(rk808->regmap, RK808_RTC_STATUS_REG,
282	RTC_STATUS_MASK);
283	if (ret) {
284	dev_err(&client->dev,
285	"%s:Failed to update RTC status: %d\n", __func__, ret);
286	return ret;
287	}
288
289	rtc_update_irq(rk808_rtc->rtc, 1, RTC_IRQF \| RTC_AF);
290	dev_dbg(&client->dev,
291	"%s:irq=%d\n", __func__, irq);
292	return IRQ_HANDLED;
293	}
294
295	static const struct rtc_class_ops rk808_rtc_ops = {
296	.read_time = rk808_rtc_readtime,
297	.set_time = rk808_rtc_set_time,
298	.read_alarm = rk808_rtc_readalarm,
299	.set_alarm = rk808_rtc_setalarm,
300	.alarm_irq_enable = rk808_rtc_alarm_irq_enable,
301	};
302
303	#ifdef CONFIG_PM_SLEEP
304	/* Turn off the alarm if it should not be a wake source. */
305	static int rk808_rtc_suspend(struct device *dev)
306	{
307	struct platform_device *pdev = to_platform_device(dev);
308	struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->dev);
309
310	if (device_may_wakeup(dev))
311	enable_irq_wake(rk808_rtc->irq);
312
313	return 0;
314	}
315
316	/* Enable the alarm if it should be enabled (in case it was disabled to
317	* prevent use as a wake source).
318	*/
319	static int rk808_rtc_resume(struct device *dev)
320	{
321	struct platform_device *pdev = to_platform_device(dev);
322	struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->dev);
323
324	if (device_may_wakeup(dev))
325	disable_irq_wake(rk808_rtc->irq);
326
327	return 0;
328	}
329	#endif
330
331	static SIMPLE_DEV_PM_OPS(rk808_rtc_pm_ops,
332	rk808_rtc_suspend, rk808_rtc_resume);
333
334	static int rk808_rtc_probe(struct platform_device *pdev)
335	{
336	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
337	struct rk808_rtc *rk808_rtc;
338	struct rtc_time tm;
339	int ret;
340
341	rk808_rtc = devm_kzalloc(&pdev->dev, sizeof(*rk808_rtc), GFP_KERNEL);
342	if (rk808_rtc == NULL)
343	return -ENOMEM;
344
345	platform_set_drvdata(pdev, rk808_rtc);
346	rk808_rtc->rk808 = rk808;
347
348	/* start rtc running by default, and use shadowed timer. */
349	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
350	BIT_RTC_CTRL_REG_STOP_RTC_M \|
351	BIT_RTC_CTRL_REG_RTC_READSEL_M,
352	BIT_RTC_CTRL_REG_RTC_READSEL_M);
353	if (ret) {
354	dev_err(&pdev->dev,
355	"Failed to update RTC control: %d\n", ret);
356	return ret;
357	}
358
359	ret = regmap_write(rk808->regmap, RK808_RTC_STATUS_REG,
360	RTC_STATUS_MASK);
361	if (ret) {
362	dev_err(&pdev->dev,
363	"Failed to write RTC status: %d\n", ret);
364	return ret;
365	}
366
367	/* set init time */
368	ret = rk808_rtc_readtime(&pdev->dev, &tm);
369	if (ret) {
370	dev_err(&pdev->dev, "Failed to read RTC time\n");
371	return ret;
372	}
373	ret = rtc_valid_tm(&tm);
374	if (ret)
375	dev_warn(&pdev->dev, "invalid date/time\n");
376
377	device_init_wakeup(&pdev->dev, 1);
378
379	rk808_rtc->rtc = devm_rtc_device_register(&pdev->dev, "rk808-rtc",
380	&rk808_rtc_ops, THIS_MODULE);
381	if (IS_ERR(rk808_rtc->rtc)) {
382	ret = PTR_ERR(rk808_rtc->rtc);
383	return ret;
384	}
385
386	rk808_rtc->irq = platform_get_irq(pdev, 0);
387	if (rk808_rtc->irq < 0) {
388	if (rk808_rtc->irq != -EPROBE_DEFER)
389	dev_err(&pdev->dev, "Wake up is not possible as irq = %d\n",
390	rk808_rtc->irq);
391	return rk808_rtc->irq;
392	}
393
394	/* request alarm irq of rk808 */
395	ret = devm_request_threaded_irq(&pdev->dev, rk808_rtc->irq, NULL,
396	rk808_alarm_irq, 0,
397	"RTC alarm", rk808_rtc);
398	if (ret) {
399	dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
400	rk808_rtc->irq, ret);
401	}
402
403	return ret;
404	}
405
406	static struct platform_driver rk808_rtc_driver = {
407	.probe = rk808_rtc_probe,
408	.driver = {
409	.name = "rk808-rtc",
410	.pm = &rk808_rtc_pm_ops,
411	},
412	};
413
414	module_platform_driver(rk808_rtc_driver);
415
416	MODULE_DESCRIPTION("RTC driver for the rk808 series PMICs");
417	MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
418	MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
419	MODULE_LICENSE("GPL");
420	MODULE_ALIAS("platform:rk808-rtc");